/* =============================================
   GOODNOTES VOCAB GENERATOR — Global CSS
   Apple HIG Design System v11.0
   ============================================= */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

/* ── Apple HIG Semantic Color Tokens (Dark — Default) ── */
:root {
  /* System Background */
  --bg:              #000000;
  --bg-card:         rgba(28, 28, 30, 0.85);
  --bg-card-hover:   rgba(44, 44, 46, 0.9);
  --bg-secondary:    #1c1c1e;
  --bg-tertiary:     #2c2c2e;

  /* Separator / Border */
  --border:          rgba(84, 84, 88, 0.65);
  --border-focus:    rgba(10, 132, 255, 0.7);

  /* System Colors */
  --primary:         #0a84ff;  /* systemBlue dark */
  --primary-light:   #409cff;
  --primary-glow:    rgba(10, 132, 255, 0.35);
  --accent:          #30d158;  /* systemGreen dark */
  --accent-light:    #4cd964;
  --danger:          #ff453a;  /* systemRed dark */
  --warning:         #ffd60a;  /* systemYellow dark */
  --success:         #30d158;

  /* Labels */
  --text:            #ffffff;
  --text-primary:    #ffffff;
  --text-secondary:  rgba(255, 255, 255, 0.85);
  --text-tertiary:   rgba(255, 255, 255, 0.60);
  --text-muted:      rgba(235, 235, 245, 0.3);
  --text-accent:     #0A84FF;
  --text-accent-bright: #64D2FF;

  /* Radii — HIG standard */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-card: 0 2px 16px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 32px var(--primary-glow);

  /* Animations */
  --transition:       0.22s cubic-bezier(0.4, 0, 0.2, 1);
  --spring-bounce:    cubic-bezier(0.34, 1.56, 0.64, 1);
  --spring-smooth:    cubic-bezier(0.25, 0.46, 0.45, 0.94);

  /* Typography — SF Pro system stack */
  --font-sf:         -apple-system, 'SF Pro Display', 'SF Pro Text', BlinkMacSystemFont, 'Helvetica Neue', 'Inter', sans-serif;
  --font-sans:       -apple-system, 'SF Pro Text', BlinkMacSystemFont, 'Helvetica Neue', 'Inter', system-ui, sans-serif;
  --font-mono:       'SF Mono', 'JetBrains Mono', ui-monospace, monospace;
  --font-rounded:    'Nunito', sans-serif;
  --font-ko-rounded: 'Jua', sans-serif;

  /* Liquid Glass material */
  --glass-bg:        rgba(28, 28, 30, 0.7);
  --glass-border:    rgba(255, 255, 255, 0.12);
  --glass-blur:      20px;
}

/* ── Light Theme Overrides ── */
body[data-theme="light"] {
  --bg:              #f2f2f7;
  --bg-card:         rgba(255, 255, 255, 0.85);
  --bg-card-hover:   rgba(255, 255, 255, 0.95);
  --bg-secondary:    #ffffff;
  --bg-tertiary:     #e5e5ea;

  --border:          rgba(60, 60, 67, 0.29);
  --border-focus:    rgba(0, 122, 255, 0.7);

  --primary:         #007aff;  /* systemBlue light */
  --primary-light:   #3395ff;
  --primary-glow:    rgba(0, 122, 255, 0.25);
  --accent:          #34c759;  /* systemGreen light */
  --accent-light:    #57d76a;
  --danger:          #ff3b30;  /* systemRed light */
  --warning:         #ff9500;  /* systemOrange light */
  --success:         #34c759;

  --text:            #000000;
  --text-primary:    #000000;
  --text-secondary:  rgba(60, 60, 67, 0.6);
  --text-tertiary:   rgba(60, 60, 67, 0.4);
  --text-muted:      rgba(60, 60, 67, 0.3);
  --text-accent:     #007AFF;
  --text-accent-bright: #007AFF;

  --shadow-card:     0 2px 16px rgba(0,0,0,0.1);
  --shadow-glow:     0 0 24px var(--primary-glow);

  --glass-bg:        rgba(255, 255, 255, 0.72);
  --glass-border:    rgba(60, 60, 67, 0.15);
}

/* ── Liquid Glass Material ── */
.liquid-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border: 1px solid var(--glass-border);
}

/* ── Spring Press Feedback ── */
.spring-press {
  transition: transform 0.1s var(--spring-smooth);
}
.spring-press:active {
  transform: scale(0.96);
}

html { 
  --gui-scale: 1;
  --screen-height: 100dvh;
  --screen-width: 100vw;
  --safe-top: calc(env(safe-area-inset-top, 0px) / var(--gui-scale));
  --safe-right: calc(env(safe-area-inset-right, 0px) / var(--gui-scale));
  --safe-bottom: calc(env(safe-area-inset-bottom, 0px) / var(--gui-scale));
  --safe-left: calc(env(safe-area-inset-left, 0px) / var(--gui-scale));
  scroll-behavior: smooth;
  font-size: 17px; /* Apple HIG body size = 17pt */
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  overscroll-behavior: none;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.47;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: var(--screen-height);
  margin: 0;
  overscroll-behavior: none;
  /* Smooth theme transition */
  transition: background 0.3s var(--spring-smooth), color 0.3s var(--spring-smooth);
}
body.modal-open {
  overflow: hidden !important;
}

/* ---- Background orbs ---- */
.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.25; /* Subtler for Apple HIG */
  transition: opacity 0.4s ease;
}
body[data-theme="light"] .bg-orb { opacity: 0.12; }
.orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #0a84ff 0%, transparent 70%);
  top: -150px; left: -150px;
  animation: float 12s ease-in-out infinite alternate;
}
.orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #30d158 0%, transparent 70%);
  bottom: 10%; right: -100px;
  animation: float 15s ease-in-out infinite alternate-reverse;
}
.orb-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, #5e5ce6 0%, transparent 70%);
  top: 50%; left: 40%;
  animation: float 10s ease-in-out infinite alternate;
}
@keyframes float {
  from { transform: translate(0,0) scale(1); }
  to   { transform: translate(30px, 20px) scale(1.08); }
}

/* ── Layout ── */
.app-container {
  position: relative;
  z-index: 1;
  width: 100%;
  margin: 0 auto;
  padding: 0 0 96px;  /* bottom space for floating pill bar */
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* ── Apple Navigation Bar ── */
.app-header {
  display: none; /* replaced by nav bar */
}

/* Large Title Navigation Bar */
.ios-nav-bar {
  position: sticky;
  top: 0;
  z-index: 200;
  width: 100%;
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 0.5px solid var(--border);
  overflow: clip;
  transition: background 0.3s var(--spring-smooth), height 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}
.ios-nav-bar-inner {
  position: relative;
  max-width: 680px;
  margin: 0 auto;
  padding: 0 16px;
}
.ios-nav-bar, .library-nav-ghost, .library-nav-exit {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
.library-nav-ghost {
  position: fixed;
  z-index: 250;
  pointer-events: none;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.2;
  transform-origin: left top;
  will-change: transform;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}
.library-nav-exit {
  position: absolute;
  z-index: 3;
  overflow: hidden;
  white-space: nowrap;
  pointer-events: none;
}
.library-nav-exit > span { display: block; }
/* Inline title row (back button area) */
.ios-nav-inline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 44px;
  gap: 8px;
}
.ios-nav-back {
  max-width: 42%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 2px;
  background: none;
  border: none;
  color: var(--primary);
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.2;
  cursor: pointer;
  padding: 0 4px;
  min-width: 44px;
  min-height: 44px;
  border-radius: 8px;
  transition: opacity 0.15s;
}
.ios-nav-back:active { opacity: 0.6; }
#ios-back-text {
  display: block;
  font-weight: 700;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ios-back-label-slot { display: block; min-width: 0; overflow: hidden; }
.ios-title-label { display: block; }
.library-nav-pending { visibility: hidden !important; }
#ios-back-text.ios-back-label-paint { will-change: opacity; }
.ios-back-label-paint.library-nav-pending {
  visibility: visible !important;
  opacity: 0;
}
.ios-large-title-text.library-nav-pending {
  /* The flying label targets this layout box; do not also ease the hidden box. */
  transition: none !important;
}
.ios-nav-back-chevron {
  font-size: 20px;
  font-weight: 300;
  line-height: 1;
  margin-top: -1px;
}
.ios-nav-title-inline {
  line-height: 1.2;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  visibility: hidden;
  font-family: var(--font-sf);
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  flex: 1;
  text-align: center;
  opacity: 0; /* hidden, shown via JS on scroll */
  transition: opacity 0.2s;
}
.ios-nav-title-inline.visible { opacity: 1; }
.ios-nav-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  min-width: 44px;
  justify-content: flex-end;
}
.ios-nav-action-btn {
  transform-origin: center;
  background: none;
  border: none;
  color: var(--primary);
  font-size: 17px;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.ios-nav-action-btn:active { background: rgba(128,128,128,0.2); 
  transform: scale(0.94);
  transition: transform 0.15s cubic-bezier(0.25, 1, 0.5, 1);
}

/* Large Title area */
.ios-large-title {
  padding: 4px 0 12px;
  transition: padding 0.3s var(--spring-smooth), gap 0.3s var(--spring-smooth);
}
.ios-title-slot {
  width: 100%;
  height: 41px;
  min-width: 0;
  transition: height 0.3s var(--spring-smooth);
}
.ios-large-title-text {
  position: absolute;
  top: 0;
  left: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  pointer-events: none;
  transform-origin: left center;
  transition: transform 0.3s var(--spring-smooth), font-size 0.3s var(--spring-smooth), width 0.3s var(--spring-smooth);
  font-family: var(--font-sf);
  font-size: 34px;
  font-weight: 700; /* Bold */
  line-height: 1.2;
  letter-spacing: -0.022em;
  color: var(--text);
}
.ios-nav-bar.compact .ios-title-slot { height: 0; }
.ios-nav-bar.compact .ios-large-title-text { font-family: var(--font-sans); font-size: 17px; font-weight: 700; }
.ios-nav-bar.compact .ios-large-title { padding: 0 0 6px; gap: 0 !important; }
.ios-nav-bar.compact .ios-nav-bar-inner { padding-top: 0; padding-bottom: 0; }
@media (prefers-reduced-motion: reduce) {
  .ios-nav-bar, .ios-large-title, .ios-title-slot, .ios-large-title-text { transition: none; }
}
.ios-large-title-sub {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* App-wide breadcrumb (legacy class kept) */
#breadcrumb {
  display: none; /* navigation handled by ios-nav-bar */
}

/* Old classes kept for compat */
.logo-wrap, .logo-icon, .app-title, .app-subtitle { display: none; }

.word-section-etymology {
  margin-top: 16px;
}
.ety-container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 0; /* Vertical gap if wrapped, no horizontal gap to snap blocks */
  background: var(--bg-card);
  padding: 12px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.05);
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.05);
}
.ety-chip {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 12px 6px 16px;
  border-radius: 4px;
  color: white;
  box-shadow: 
    inset 0 2px 0 rgba(255,255,255,0.25), 
    inset 0 -3px 0 rgba(0,0,0,0.2),
    0 2px 4px rgba(0,0,0,0.15);
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}
.ety-chip:first-of-type {
  padding-left: 12px;
}
.ety-chip::after {
  content: '';
  position: absolute;
  right: -8px;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 18px;
  background: inherit;
  border-radius: 0 3px 3px 0;
  box-shadow: 
    inset 0 2px 0 rgba(255,255,255,0.25), 
    inset -2px 0 0 rgba(0,0,0,0.15),
    inset 0 -2px 0 rgba(0,0,0,0.2);
  z-index: 2;
}
.ety-chip:last-of-type::after {
  display: none;
}
.ety-chip:nth-of-type(1) { background: #6C63FF; z-index: 10; }
.ety-chip:nth-of-type(2) { background: #00d4aa; z-index: 9; margin-left: -1px; }
.ety-chip:nth-of-type(3) { background: #fbbf24; z-index: 8; margin-left: -1px; }
.ety-chip:nth-of-type(4) { background: #f87171; z-index: 7; margin-left: -1px; }
.ety-chip:nth-of-type(5) { background: #a78bfa; z-index: 6; margin-left: -1px; }
.ety-chip:nth-of-type(n+6) { background: #38bdf8; z-index: 5; margin-left: -1px; }

.ety-en {
  font-family: var(--font-rounded);
  font-weight: 900;
  font-size: 1.15rem;
  line-height: 1.1;
  letter-spacing: 0.5px;
}
.ety-ko {
  font-size: 0.75rem;
  font-weight: 600;
  opacity: 0.95;
  margin-top: 4px;
}
.ety-result-wrap {
  display: inline-flex;
  align-items: center;
  margin-left: 14px;
  z-index: 1;
}
.ety-arrow {
  color: var(--text-muted);
  font-weight: 900;
  font-size: 1.1rem;
  margin-right: 8px;
}
.ety-result {
  font-family: var(--font-rounded);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--text-accent-bright);
  background: rgba(108, 99, 255, 0.15);
  padding: 6px 14px;
  border-radius: 8px;
  border: 2px dashed rgba(108, 99, 255, 0.5);
  letter-spacing: 0.5px;
}
.badge-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: flex-start;
}
.badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
  letter-spacing: 0.01em;
}
.badge-ai {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: white;
  box-shadow: 0 2px 12px var(--primary-glow);
}
.badge-compat {
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background: var(--bg-card);
}

/* ---- Cards (Liquid Glass) ---- */
.card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 22px;
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition), box-shadow var(--transition), transform 0.12s var(--spring-smooth);
}
.card:hover {
  border-color: rgba(10, 132, 255, 0.3);
  box-shadow: 0 4px 24px rgba(0,0,0,0.35);
}

.step-card { }

.step-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 22px;
}
.step-num {
  width: 36px; height: 36px;
  min-width: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 12px var(--primary-glow);
}
.step-num-success {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  box-shadow: 0 2px 12px rgba(0,212,170,0.4);
}
.step-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}
.step-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}
.link {
  color: var(--primary-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(167, 139, 250, 0.35);
  transition: color var(--transition), border-color var(--transition);
}
.link:hover {
  color: var(--primary);
  border-color: var(--primary);
}

/* ---- API Key ---- */
.api-key-wrap {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.input-group {
  display: flex;
  gap: 8px;
}
.text-input {
  flex: 1;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 12px 16px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.text-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.15);
}
.text-input::placeholder { color: var(--text-muted); }

.icon-btn {
  width: 46px; height: 46px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition);
}
.icon-btn:hover { background: rgba(255,255,255,0.12); color: var(--text); }
.icon-btn svg { width: 18px; height: 18px; }

.api-status {
  font-size: 0.8rem;
  min-height: 18px;
  color: var(--text-secondary);
}
.api-status.ok { color: var(--success); }
.api-status.err { color: var(--danger); }

/* ---- Sample buttons ---- */
.sample-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.sample-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
}
/* ── Apple Button System ── */

/* Bordered (secondary action) */
.sample-btn {
  background: transparent;
  border: 1.5px solid var(--primary);
  border-radius: 14px;
  color: var(--primary);
  font-size: 17px;
  font-weight: 400;
  padding: 8px 20px;
  min-height: 44px;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: background 0.15s var(--spring-smooth), transform 0.1s var(--spring-smooth);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.sample-btn:hover { background: rgba(10,132,255,0.08); }
.sample-btn:active { transform: scale(0.96); background: rgba(10,132,255,0.15); }

/* Destructive bordered */
.danger-btn {
  border-color: var(--danger) !important;
  color: var(--danger) !important;
}
.danger-btn:hover { background: rgba(255,69,58,0.1) !important; }

/* ---- Textarea ---- */
.textarea-wrap {
  position: relative;
  margin-bottom: 20px;
}
.vocab-textarea {
  width: 100%;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  padding: 16px;
  padding-bottom: 36px;
  resize: vertical;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.vocab-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.15);
}
.vocab-textarea::placeholder { color: var(--text-muted); line-height: 1.7; }

.textarea-footer {
  position: absolute;
  bottom: 10px;
  left: 16px;
  right: 16px;
  display: flex;
  justify-content: space-between;
  pointer-events: none;
}
.char-count {
  font-size: 0.75rem;
  color: var(--text-muted);
}
.textarea-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ---- Options Grid ---- */
.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(185px, 1fr));
  gap: 12px;
}
.option-card {
  background: #2C2C2E;
  border: 1px solid #3A3A3C;
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.option-label {
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-weight: 500;
}
.select-input {
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  padding: 7px 10px;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition);
}
.select-input:focus { border-color: var(--border-focus); }
.select-input option { background: #1a1b2e; }

/* ── Apple Filled Button (Primary) ── */
.generate-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--primary);
  border: none;
  border-radius: 10px;
  color: white;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 600;
  padding: 14px 32px;
  min-height: 50px;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
  transition: background 0.15s, transform 0.1s var(--spring-smooth), box-shadow 0.15s;
  letter-spacing: -0.01em;
}
.generate-btn:disabled {
  background: var(--bg-tertiary, #2c2c2e);
  color: var(--text-muted);
  box-shadow: none;
  cursor: not-allowed;
}
.generate-btn:not(:disabled):hover { background: var(--primary-light); }
.generate-btn:not(:disabled):active { transform: scale(0.97); }

.btn-icon {
  font-size: 1.1rem;
  animation: spin-star 4s linear infinite;
}
@keyframes spin-star {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
.generate-btn:disabled .btn-icon { animation: none; }

.generate-hint {
  font-size: 13px;
  color: var(--text-muted);
}

/* ---- Progress ---- */
.progress-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.progress-card {
  background: var(--bg-card);
  border: 1px solid rgba(108, 99, 255, 0.3);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 18px;
  box-shadow: var(--shadow-card);
}
.progress-spinner {
  width: 40px; height: 40px;
  min-width: 40px;
  border: 3px solid rgba(108, 99, 255, 0.2);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
.progress-text {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
}
.progress-sub {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 2px;
}
.progress-bar-wrap {
  height: 4px;
  background: rgba(255,255,255,0.06);
  border-radius: 999px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 999px;
  transition: width 0.5s ease;
}

/* ---- Preview Table ---- */
.table-wrap {
  margin-bottom: 20px;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}
.table-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: rgba(0,0,0,0.3);
  border-bottom: 1px solid var(--border);
}
.table-section-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}
.preview-container {
  max-height: 380px;
  overflow-y: auto;
  transition: max-height 0.35s ease;
}
.preview-container.collapsed { max-height: 0; }
/* Hide scrollbar globally for a native app feel */
::-webkit-scrollbar {
  display: none !important;
}
* {
  -ms-overflow-style: none !important;  /* IE and Edge */
  scrollbar-width: none !important;  /* Firefox */
}

.preview-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.83rem;
}
.preview-table thead { position: sticky; top: 0; z-index: 2; }
.preview-table th {
  background: rgba(108, 99, 255, 0.12);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 10px 14px;
  text-align: left;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--border);
}
.preview-table th:first-child { width: 42px; text-align: center; }

.preview-table td {
  padding: 10px 14px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  vertical-align: top;
  line-height: 1.5;
}
.preview-table tr:last-child td { border-bottom: none; }
.preview-table tr:hover td { background: rgba(255,255,255,0.03); }
.preview-table td:first-child {
  color: var(--text-muted);
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.preview-table td:nth-child(2) {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--primary-light);
  white-space: nowrap;
}
.preview-table td:nth-child(3) {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

/* ---- Download ---- */
.download-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding: 20px;
  background: rgba(0,0,0,0.25);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  margin-bottom: 20px;
}
.format-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: #0d0e1a;
  font-weight: 700;
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 999px;
  margin-right: 8px;
  letter-spacing: 0.04em;
}
.format-desc { font-size: 0.85rem; color: var(--text-secondary); }

.download-buttons { display: flex; gap: 10px; flex-wrap: wrap; }
.download-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 11px 22px;
  cursor: pointer;
  transition: all var(--transition);
}
.download-btn svg { width: 16px; height: 16px; }
.download-primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  color: #0d0e1a;
  box-shadow: 0 3px 14px rgba(0, 212, 170, 0.35);
}
.download-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 212, 170, 0.5);
}
.download-secondary {
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}
.download-secondary:hover {
  background: rgba(255,255,255,0.13);
  color: var(--text);
}

/* ---- Small btn ---- */
.small-btn {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 0.78rem;
  padding: 4px 12px;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: all var(--transition);
}
.small-btn:hover { background: rgba(255,255,255,0.12); color: var(--text); }

/* ---- Import Guide ---- */
.import-guide {
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  overflow: hidden;
}
.import-guide-summary {
  padding: 14px 18px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,0,0,0.2);
  transition: background var(--transition);
}
.import-guide-summary::-webkit-details-marker { display: none; }
.import-guide-summary::before {
  content: '??;
  font-size: 0.7rem;
  transition: transform 0.2s;
}
.import-guide[open] .import-guide-summary::before { transform: rotate(90deg); }
.import-guide-summary:hover { background: rgba(255,255,255,0.05); color: var(--text); }

.import-steps {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.import-step {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.import-step-num {
  width: 26px; height: 26px;
  min-width: 26px;
  background: var(--primary);
  border-radius: 50%;
  color: white;
  font-size: 0.78rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.import-step p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.5; }
.import-step strong { color: var(--text); }
.import-note {
  font-size: 0.8rem;
  color: var(--warning);
  background: rgba(251, 191, 36, 0.08);
  border: 1px solid rgba(251, 191, 36, 0.2);
  border-radius: 8px;
  padding: 10px 14px;
}

/* ---- Error ---- */
.error-section {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: rgba(248, 113, 113, 0.08);
  border: 1px solid rgba(248, 113, 113, 0.3);
  border-radius: var(--radius-md);
  padding: 18px 22px;
}
.error-icon {
  font-size: 1.3rem;
  color: var(--danger);
  line-height: 1;
}
.error-title { font-size: 0.95rem; font-weight: 600; color: var(--danger); margin-bottom: 4px; }
.error-msg { font-size: 0.85rem; color: var(--text-secondary); }

/* ---- Footer ---- */
.app-footer {
  text-align: center;
  padding-top: 10px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ---- Tab Switcher ---- */
.tab-switcher {
  display: flex;
  gap: 6px;
  margin-bottom: 20px;
  background: rgba(0,0,0,0.25);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 5px;
}
.tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  border-radius: 10px;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 10px 16px;
  cursor: pointer;
  transition: all var(--transition);
}
.tab-btn:hover { color: var(--text); background: rgba(255,255,255,0.05); }
.tab-btn.tab-active {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  box-shadow: 0 2px 12px var(--primary-glow);
}
.tab-panel { animation: fadeIn 0.2s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* ---- Image Dropzone ---- */
.image-dropzone {
  border: 2px dashed rgba(108, 99, 255, 0.35);
  border-radius: var(--radius-md);
  background: rgba(108, 99, 255, 0.04);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  outline: none;
  margin-bottom: 16px;
}
.image-dropzone:hover,
.image-dropzone.drag-over {
  border-color: var(--primary);
  background: rgba(108, 99, 255, 0.1);
  box-shadow: 0 0 0 4px rgba(108, 99, 255, 0.1);
}
.image-dropzone:focus-visible {
  box-shadow: 0 0 0 3px var(--primary);
}
.file-input-hidden {
  display: none;
}
.dropzone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  pointer-events: none;
}
.dropzone-icon svg { width: 64px; height: 64px; }
.dropzone-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}
.dropzone-sub {
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.dropzone-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  pointer-events: all;
  margin-top: 4px;
}
.dropzone-pick-btn {
  background: rgba(108, 99, 255, 0.15);
  border-color: rgba(108, 99, 255, 0.4);
  color: var(--primary-light);
}
.dropzone-pick-btn:hover {
  background: rgba(108, 99, 255, 0.28);
  color: white;
}
.dropzone-formats {
  font-size: 0.73rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-top: 4px;
}

/* ---- Image Previews ---- */
.image-previews {
  margin-bottom: 16px;
}
.preview-header {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.preview-count {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-right: auto;
}
.danger-btn {
  color: var(--danger) !important;
  border-color: rgba(248, 113, 113, 0.3) !important;
}
.danger-btn:hover {
  background: rgba(248, 113, 113, 0.1) !important;
  border-color: rgba(248, 113, 113, 0.6) !important;
  color: var(--danger) !important;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 10px;
}
.img-thumb-wrap {
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
  background: rgba(0,0,0,0.3);
  aspect-ratio: 4/3;
  transition: border-color var(--transition);
}
.img-thumb-wrap:hover { border-color: rgba(108, 99, 255, 0.5); }
.img-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.img-thumb-remove {
  position: absolute;
  top: 5px;
  right: 5px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(15, 15, 30, 0.85);
  border: 1px solid rgba(248, 113, 113, 0.5);
  color: var(--danger);
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition), background var(--transition);
  line-height: 1;
}
.img-thumb-wrap:hover .img-thumb-remove { opacity: 1; }
.img-thumb-remove:hover { background: rgba(248, 113, 113, 0.25); }
.img-thumb-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  font-size: 0.7rem;
  color: rgba(255,255,255,0.7);
  padding: 16px 6px 5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---- Utils ---- */
.hidden { display: none !important; }

/* ── Apple Modal Scrim ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: flex-end;  /* bottom sheet default */
  justify-content: center;
  z-index: 1000;
  padding: 0;
  animation: fadeIn 0.2s ease;
}

/* ── Apple Bottom Sheet (iOS Sheet) ── */
.modal-screen {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  justify-content: flex-end; /* Slide up from bottom */
  align-items: stretch;
  opacity: 0;
  transition: opacity 0.3s var(--spring-smooth);
  will-change: opacity;
  overflow: clip;
}
.modal-screen.show {
  opacity: 1;
  pointer-events: auto;
}
.modal-screen.hidden {
  display: flex !important;
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
  transition: opacity 0.3s var(--spring-smooth), visibility 0s 0.3s;
}

/* Sheet content slides up */
.modal-screen-content {
  background: #1C1C1E;
  border-radius: 20px;
  width: 100%;
  max-width: 100%;
  max-height: calc(var(--screen-height) * 0.92);
  padding: 24px;
  box-shadow: none;
  transform: translateY(100%);
  opacity: 1;
  will-change: transform;
  /* A bottom sheet must never overshoot upward and expose its lower edge. */
  transition: transform 0.34s cubic-bezier(0.22, 1, 0.36, 1);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.modal-screen.show .modal-screen-content {
  transform: translateY(0);
}
.modal-screen.hidden .modal-screen-content {
  transform: translateY(100%);
}

/* Background layer for rounded corners (only for sheet modals) */
.sheet-modal::after {
  content: '';
  position: absolute;
  top: 32px;
  left: 0;
  right: 0;
  bottom: 0;
  background: #1C1C1E;
  border-top: 1px solid #2C2C2E;
  border-radius: 26px 26px 0 0;
  z-index: -1;
  pointer-events: none;
}

/* Drag Handle (only for sheet modals) */
.sheet-modal::before {
  content: '';
  display: block;
  width: 36px;
  height: 5px;
  background: #3A3A3C;
  border-radius: 3px;
  margin: 12px auto 8px;
  flex-shrink: 0;
}

/* Sheet inner scroll area */
.modal-screen-content > *:not(:first-child),
.modal-screen-content > h3 {
  padding: 0 0;
  overflow-y: auto;
}

/* Override for specific sheet types */
.modal-screen-content[style*="max-height"] {
  /* custom max-height overrides allowed */
}

/* Alert modal (centered, not sheet) */
.modal-box {
  background: #1C1C1E;
  border: 0.5px solid #2C2C2E;
  border-radius: 20px;
  padding: 24px;
  max-width: 320px;
  width: 90%;
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: auto;
}
.modal-icon { font-size: 2.4rem; text-align: center; }
.modal-title {
  font-family: var(--font-sf);
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  text-align: center;
  margin: 0;
}
.modal-desc {
  font-size: 13px;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.5;
}
.modal-input-wrap {
  display: flex;
  gap: 8px;
}
/* ── Apple Text Inputs ── */
.text-input, .modal-text-input {
  background: var(--bg-tertiary, rgba(255,255,255,0.06));
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  padding: 10px 12px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
  width: 100%;
  box-sizing: border-box;
}
.text-input:focus, .modal-text-input:focus {
  background: var(--bg-card);
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.2);
}
.text-input::placeholder, .modal-text-input::placeholder {
  color: var(--text-muted);
}
.modal-note {
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
}
/* Deprecated, use .generate-btn instead */
.modal-save-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  border-radius: 10px;
  border: none;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  font-weight: 600;
}
.modal-save-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  filter: grayscale(100%);
}

/* ---- Key status & change button ---- */
.key-status {
  font-size: 13px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.key-status.ok {
  color: var(--success);
  border-color: rgba(74, 222, 128, 0.3);
  background: rgba(74, 222, 128, 0.07);
}
.key-change-btn {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  padding: 4px 12px;
  cursor: pointer;
  transition: all var(--transition);
}
.key-change-btn:hover {
  background: rgba(108,99,255,0.12);
  border-color: rgba(108,99,255,0.4);
  color: var(--primary-light);
}

/* ---- Responsive ---- */
@media (max-width: 600px) {
  .app-header { flex-direction: column; }
  .options-grid { grid-template-columns: 1fr 1fr; }
  .generate-btn { padding: 14px 32px; }
  .download-section { flex-direction: column; }
}

.version-badge {
  font-size: 0.85rem;
  font-weight: 500;
  background: rgba(108, 99, 255, 0.15);
  color: var(--primary);
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  vertical-align: middle;
  margin-left: 0.5rem;
}

/* ?€?€?€ Library Cards ?€?€?€ */
.lib-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.4rem;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  position: relative;
  overflow: hidden;
}
.lib-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(0,0,0,0.35);
  border-color: rgba(108, 99, 255, 0.4);
  background: rgba(108, 99, 255, 0.07);
}
.lib-icon { font-size: 2.2rem; margin-bottom: 0.8rem; }
.lib-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  word-break: keep-all;
}

/* ?€?€?€ Words Action Bar ?€?€?€ */
/* ── Apple-style Words Toolbar (inside nav bar) ── */
.sticky-top-bar {
  /* Merged into ios-nav-bar; this wrapper just provides spacing */
  padding: 0;
  margin: 0;
  background: transparent;
  border: none;
  box-shadow: none;
}

.words-action-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px 10px;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.words-action-bar::-webkit-scrollbar { display: none; }

/* ── Apple iOS Segmented Control ── */
.view-toggle-group {
  display: flex;
  position: relative;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border-radius: 9px;
  padding: 2px;
  gap: 0;
  flex-shrink: 0;
  border: 1px solid var(--glass-border);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}
/* Sliding active indicator */
.view-toggle-group::before {
  content: '';
  position: absolute;
  top: 2px;
  bottom: 2px;
  border-radius: 7px;
  background: var(--bg-secondary, #1c1c1e);
  box-shadow: 0 1px 3px rgba(0,0,0,0.4), 0 0 0 0.5px rgba(0,0,0,0.15);
  transition: left 0.2s var(--spring-smooth), width 0.2s var(--spring-smooth);
  z-index: 0;
  pointer-events: none;
}
body[data-theme="light"] .view-toggle-group::before {
  background: #ffffff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.view-toggle-btn {
  position: relative;
  z-index: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 5px 12px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  transition: color 0.15s;
  min-height: 32px;
  white-space: nowrap;
}
.view-toggle-btn svg { width: 13px; height: 13px; }
.view-toggle-btn.active {
  color: var(--text);
  font-weight: 600;
}

/* Edit Circular Button matching Segments */
.edit-circle-btn {
  width: 29px;
  height: 29px;
  border-radius: 50%;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  transition: all 0.2s;
}
.edit-circle-btn:hover {
  background: rgba(255,255,255,0.1);
}
.edit-circle-btn:active {
  transform: scale(0.92);
}
body[data-theme="light"] .edit-circle-btn {
  background: #ffffff;
  border: 1px solid rgba(0,0,0,0.1);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* ─── Test Start Button ─── */
.test-start-btn {
  background: linear-gradient(135deg, #f59e0b, #f97316);
  border: none;
  border-radius: var(--radius-xl);
  color: white;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.5rem 1.1rem;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.35);
  transition: all 0.22s;
}
.test-start-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.5);
}

/* ─── Apple Tab Bar (Bottom Floating Controls) ─── */
.hide-toggle-bar {
  position: fixed;
  bottom: calc(12px + var(--safe-bottom));
  left: 50%;
  transform: translateX(-50%);
  width: 380px;
  min-width: 0;
  white-space: nowrap;
  max-width: calc(var(--screen-width) - 32px);
  box-sizing: border-box;
  z-index: 1000;
  display: block;
  padding: 6px;
  /* Liquid Glass Tab Bar */
  background: var(--glass-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--glass-border);
  border-radius: 18px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.16);
  transition: opacity 0.22s ease, transform 0.28s var(--spring-smooth);
  pointer-events: none;
}
body[data-theme="light"] .hide-toggle-bar {
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
.hide-toggle-bar.hidden {
  display: none !important;
}
.hide-toggle-bar.active-view {
  transform: translateX(-50%);
  opacity: 1;
  pointer-events: auto;
  animation: study-tools-enter 0.28s var(--spring-smooth);
}
.hide-toggle-bar.idle-left {
  transform: translate(-50%, 16px);
  opacity: 0;
}
.hide-toggle-bar.idle-right {
  transform: translate(-50%, 16px);
  opacity: 0;
}
.hide-toggle-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-right: 4px;
  flex-shrink: 0;
  padding-left: 4px;
}
.hide-toggle-btn {
  position: relative;
  background: transparent;
  -webkit-tap-highlight-color: transparent;
  flex: 1;
  border: none;
  border-radius: 12px;
  color: var(--text-secondary);
  height: 44px;
  padding: 0 10px;
  box-sizing: border-box;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.18s ease, background 0.18s ease, transform 0.2s var(--spring-smooth);
  white-space: nowrap;
  min-width: 44px;
  font-family: var(--font-sans);
}
.hide-toggle-btn.active {
  color: var(--text);
  background: var(--bg-tertiary);
  font-weight: 600;
}
body[data-theme="light"] .hide-toggle-btn.active {
  color: var(--text);
  background: var(--bg-tertiary);
  box-shadow: none;
}

.hide-toggle-btn:active:not(:disabled) {
  transform: scale(0.94);
  transition: transform 0.15s cubic-bezier(0.25, 1, 0.5, 1);
}
.hide-toggle-options { display: flex; gap: 4px; }
.hide-toggle-options .hide-toggle-btn::after {
  content: ''; position: absolute; bottom: 4px; left: calc(50% - 2px);
  width: 4px; height: 4px; border-radius: 50%; background: var(--primary);
  opacity: 0; transform: scale(0.5); transition: opacity 0.18s, transform 0.2s;
}
.hide-toggle-options .hide-toggle-btn.active::after { opacity: 1; transform: scale(1); }
@keyframes study-tools-enter {
  from { opacity: 0; transform: translate(-50%, 12px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}
#lib-views-container { margin-top: 20px; }

/* ─── Apple Inset Grouped List (Word Cards) ─── */
.words-card-grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0 0 80px 0;
}

/* Each word-card = one individual card */
.word-card {
  background: var(--bg-card);
  border: 0.5px solid rgba(0, 0, 0, 0.12);
  border-radius: 16px !important;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  transform: translateZ(0);
  will-change: transform;
  transition: background 0.12s;
}


/* Cell row header (word + pos + pron) */
.word-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding-bottom: 0;
  border-bottom: none;
}

/* Main word — Title 3 (20pt, Semibold) */
.word-card-word {
  display: inline-block;
  font-family: var(--font-sf);
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.015em;
  line-height: 1.3;
  font-style: normal;
}
.pronounce-btn {
  font-size: 1.1em;
  opacity: 0.7;
  border: none;
  background: none;
  cursor: pointer;
  padding: 0 2px;
  transition: opacity 0.1s;
}
.pronounce-btn:active { opacity: 1; }

/* POS badge — Footnote (13pt) */
.word-card-pos {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 400;
  color: var(--primary);
  background: rgba(10, 132, 255, 0.12);
  padding: 2px 6px;
  border-radius: 6px;
  letter-spacing: 0;
}
body[data-theme="light"] .word-card-pos {
  background: rgba(0, 122, 255, 0.1);
}

/* Pronunciation — Caption (12pt) */
.word-card-pron {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 400;
}
.word-card-num {
  margin-left: auto;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 400;
}

/* Detail section (meaning / example / etymology) */
.word-card-section {
  font-size: 15px; /* Subhead */
  line-height: 1.5;
  margin-top: 8px;
}
.word-card-section-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Meaning — Callout (16pt, Jua) */
.word-card-meaning {
  color: var(--text);
  font-family: var(--font-ko-rounded);
  font-size: 1.1rem;
  font-weight: 400;
  white-space: pre-wrap;
  line-height: 1.4;
}

/* Example */
.word-card-example {
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-left: 2px solid var(--border);
  padding-left: 12px;
  margin-top: 2px;
}
.ex-en {
  color: var(--text-secondary);
  font-style: normal;
  line-height: 1.5;
  font-size: 15px;
}
.ex-en strong {
  color: var(--text-accent-bright);
  font-weight: 700;
}
.ex-ko {
  color: var(--text-muted);
  font-size: 13px;
}
.word-card-related-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--bg-tertiary, rgba(0,0,0,0.12));
  border-radius: 10px;
  padding: 10px 12px;
  margin-top: 6px;
}
.word-card-related-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.related-item {
  color: var(--text-secondary);
  font-size: 0.85em;
  line-height: 1.4;
  display: flex;
  align-items: flex-start;
}
.related-item::before {
  content: '??;
  margin-right: 6px;
  color: var(--text-muted);
}
.related-item-word {
  font-weight: 600;
  color: var(--primary-light);
  font-family: var(--font-mono);
}
.related-item-colon {
  margin: 0 4px 0 2px;
  color: var(--text-muted);
}
.related-item-meaning {
  color: var(--text-secondary);
}
.word-card-actions {
  display: flex;
  gap: 6px;
  margin-top: 4px;
  border-top: 1px solid var(--border);
  padding-top: 0.7rem;
}
.word-card-edit-btn, .word-card-delete-btn {
  transform-origin: center;
  font-family: var(--font-sans);
  font-size: 0.78em;
  padding: 4px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}
.word-card-edit-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}
.word-card-edit-btn:hover {
  border-color: var(--primary);
  color: var(--primary-light);
}
.word-card-delete-btn {
  background: transparent;
  border: 1px solid rgba(248, 113, 113, 0.3);
  color: var(--danger);
}
.word-card-delete-btn:hover {
  background: rgba(248, 113, 113, 0.1);
}

/* ?€?€?€ Swipe (Shorts) View ?€?€?€ */
#words-swipe-view {
  /* height is set dynamically via JS (adjustSwipeViewHeight) */
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
  padding-bottom: 0; /* Height ends above the measured bottom toolbar. */
}

/* Card fills all space above the bottom bar */
.swipe-card-wrap {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  touch-action: pan-y pinch-zoom;
  transition: transform 0.22s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.18s ease;
  will-change: transform, opacity;
}
.swipe-card-wrap.slide-in-top    { transform: translateY(0); opacity: 1; }
.swipe-card-wrap.slide-out-top   { transform: translateY(-14%) scale(0.985); opacity: 0; }
.swipe-card-wrap.slide-out-bottom { transform: translateY(14%) scale(0.985); opacity: 0; }
.swipe-card-wrap.slide-in-bottom { transform: translateY(0); opacity: 1; }
.swipe-card-wrap.slide-from-top  { transform: translateY(-14%) scale(0.985); opacity: 0; }
.swipe-card-wrap.slide-from-bottom { transform: translateY(14%) scale(0.985); opacity: 0; }

.swipe-card {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--bg-card);
  border: 0.5px solid rgba(0, 0, 0, 0.12);
  border-radius: 16px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  overscroll-behavior: contain;
  touch-action: pan-y pinch-zoom;
}

.swipe-card-content {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}
.swipe-card-primary, .swipe-card-details {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

@keyframes flipShuffle {
  0%, 100% { transform: translateY(0) scale(1); opacity: 1; }
  50% { transform: translateY(6px) scale(0.985); opacity: 0; }
}
.shuffle-anim { animation: flipShuffle 0.4s ease-in-out forwards; }

/* Slim bottom control bar */
.shorts-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  background: rgba(10, 10, 20, 0.9);
  backdrop-filter: blur(16px);
  border-top: 1px solid rgba(255,255,255,0.07);
  flex-shrink: 0;
  gap: 8px;
}

.swipe-counter {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
}

.shorts-bottom-btns {
  display: flex;
  align-items: center;
  gap: 6px;
}

.shorts-nav-btn {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  color: var(--text-secondary);
  width: 36px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.18s;
}
.shorts-nav-btn:hover { background: rgba(108,99,255,0.25); color: white; }

/* Arrow buttons: remove gap/radius between them to look like a group */
.shorts-nav-group {
  display: flex;
  gap: 0;
}
.shorts-nav-group .shorts-nav-btn:first-child {
  border-radius: 8px 0 0 8px;
  border-right: none;
}
.shorts-nav-group .shorts-nav-btn:last-child {
  border-radius: 0 8px 8px 0;
}

.shorts-ctrl-btn {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  color: var(--text-muted);
  height: 32px;
  padding: 0 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.18s;
}
.shorts-ctrl-btn.active {
  background: rgba(108,99,255,0.2);
  border-color: rgba(108,99,255,0.4);
  color: var(--primary-light);
}
.shorts-ctrl-btn:hover { background: rgba(108,99,255,0.2); }

.shorts-divider {
  color: rgba(255,255,255,0.2);
  font-size: 0.9rem;
  padding: 0 2px;
  user-select: none;
}

.shorts-hide-btn {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 6px;
  color: rgba(255,255,255,0.35);
  height: 28px;
  padding: 0 7px;
  font-size: 0.72rem;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}
.shorts-hide-btn.active {
  border-color: rgba(108,99,255,0.5);
  color: var(--primary-light);
  background: rgba(108,99,255,0.15);
}
.shorts-hide-btn:hover { border-color: rgba(108,99,255,0.4); }

/* Hide toggle bar (媛€由ш린) stays at very bottom */
.hide-toggle-bar {
  flex-shrink: 0;
}

/* Shorts mode: fill screen, hide top bar */
body.shorts-mode-active {
  overflow: hidden;
  min-height: 0;
  height: var(--screen-height);
  position: fixed;
  width: 100%;
  touch-action: pan-y pinch-zoom;
}
body.shorts-mode-active .app-footer {
  display: none;
}
body.shorts-mode-active .app-container {
  padding-bottom: 0;
}
body.shorts-mode-active #view-words {
  /* flex layout not needed; swipe view height set by JS */
}
/* Animated inactive views must not pan the Shorts frame during focus/resize. */
body.shorts-mode-active #views-container { overflow: clip !important; }

/* Hidden state for toggles */
.toggled-hidden {
  filter: blur(6px);
  user-select: none;
  cursor: pointer;
  transition: filter 0.3s;
}

.shorts-controls {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  visibility: hidden;
  transition: grid-template-rows 0.24s var(--spring-smooth), opacity 0.2s ease, visibility 0.24s;
}
.shorts-controls-inner {
  min-height: 0;
  overflow: hidden;
  display: flex;
  align-items: center;
  gap: 8px;
}
body.shorts-mode-active .shorts-controls { grid-template-rows: 1fr; opacity: 1; visibility: visible; }
.shorts-controls .hide-toggle-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  background: transparent; font-size: 12px; min-width: 0;
}
.shorts-controls .hide-toggle-btn.active { color: var(--primary); }
.shorts-controls svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.shorts-controls .swipe-counter {
  flex: none; min-width: 52px; text-align: center; font-size: 11px;
  font-variant-numeric: tabular-nums; color: var(--text-muted);
}
@media (prefers-reduced-motion: reduce) {
  .hide-toggle-bar, .hide-toggle-btn, .hide-toggle-btn::after, .shorts-controls, .swipe-card-wrap,
  .modal-screen, .modal-screen .modal-screen-content {
    transition: none !important; animation: none !important;
  }
}

/* Edit mode: show actions panel, Card mode: hide it */
.word-card-actions { display: none; }
.edit-mode-active .word-card-actions {
  display: flex;
  gap: 6px;
  margin-top: 4px;
  border-top: 1px solid var(--border);
  padding-top: 0.65rem;
}
/* Edit mode shows checkboxes */
.words-card-grid .word-chk { display: none; }
.edit-mode-active .words-card-grid .word-chk { display: inline; }

/* ?€?€?€ Test Modal ?€?€?€ */
.test-modal-box {
  padding: 2.5rem;
  max-width: 580px;
  width: 100%;
  box-shadow: 0 24px 64px rgba(0,0,0,0.7), 0 0 50px rgba(108,99,255,0.12);
  max-height: calc(var(--screen-height) * 0.9);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.test-screen {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  flex: 1;
}
/* Short answer specific stretch layout */
#test-short.test-screen {
  min-height: 100%;
  height: auto;
  padding-bottom: 0; /* Keyboard goes flush */
}
#test-short .quiz-question-box {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.test-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}
.test-mode-btn {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 10px 18px;
  cursor: pointer;
  transition: all 0.2s;
  flex: 1;
}
.test-mode-btn.active {
  background: rgba(108, 99, 255, 0.2);
  border-color: var(--primary);
  color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.15);
}

/* ?€?€?€ Progress Bar ?€?€?€ */
.test-progress-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 0.5rem;
}
.test-progress-bar {
  flex: 1;
  height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: 999px;
  overflow: hidden;
}
.test-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  border-radius: 999px;
  transition: width 0.4s ease;
  width: 0%;
}
.test-progress-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* ?€?€?€ Flashcard ?€?€?€ */
.flashcard-container {
  perspective: 1000px;
  cursor: pointer;
  user-select: none;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.flashcard {
  width: 100%;
  min-height: 200px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.4, 0, 0.2, 1);
}
.flashcard.flipped { transform: rotateY(180deg); }
.flashcard-front, .flashcard-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  text-align: center;
  min-height: 200px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.flashcard-back {
  transform: rotateY(180deg);
  font-size: 1rem;
  font-weight: 400;
  text-align: left;
  align-items: flex-start;
  justify-content: flex-start;
  flex-direction: column;
  gap: 0.5rem;
  overflow-y: auto;
  white-space: pre-wrap;
  line-height: 1.6;
}
.flip-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
}
.flash-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0;
  transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.flash-actions.show {
  max-height: 100px;
  opacity: 1;
  margin-top: 1.5rem;
}
.flash-wrong-btn, .flash-correct-btn {
  border: none;
  border-radius: var(--radius-xl);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 32px;
  cursor: pointer;
  transition: all 0.2s;
}
.flash-wrong-btn {
  background: rgba(248, 113, 113, 0.15);
  border: 1px solid rgba(248, 113, 113, 0.4);
  color: var(--danger);
}
.flash-wrong-btn:hover { background: rgba(248, 113, 113, 0.25); }
.flash-correct-btn {
  background: rgba(74, 222, 128, 0.15);
  border: 1px solid rgba(74, 222, 128, 0.4);
  color: var(--success);
}
.flash-correct-btn:hover { background: rgba(74, 222, 128, 0.25); }

/* ?€?€?€ Quiz ?€?€?€ */
.quiz-question-box {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  text-align: center;
  margin-bottom: 1rem;
}
.quiz-question-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.8rem;
}
.quiz-question-word {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  font-family: var(--font-mono);
  line-height: 1.3;
}
.quiz-choices {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.quiz-choice-btn {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  padding: 14px 18px;
  cursor: pointer;
  text-align: left;
  transition: all 0.2s;
  line-height: 1.4;
}
.quiz-choice-btn:hover:not(:disabled) {
  border-color: var(--primary);
  background: rgba(108, 99, 255, 0.1);
}
.quiz-choice-btn.correct {
  background: rgba(74, 222, 128, 0.15);
  border-color: var(--success);
  color: var(--success);
}
.quiz-choice-btn.wrong {
  background: rgba(248, 113, 113, 0.15);
  border-color: var(--danger);
  color: var(--danger);
}

.quiz-dontknow-btn {
  grid-column: 1 / -1;
  border-color: var(--warning) !important;
  color: var(--warning) !important;
  opacity: 0.75;
}
.quiz-dontknow-btn:hover:not(:disabled) {
  background: rgba(251, 191, 36, 0.12) !important;
  opacity: 1;
}

/* ?€?€?€ Card slide transition animations ?€?€?€ */
@keyframes slideInFromRight {
  from {
    transform: translateX(100px);
  }
  to {
    transform: translateX(0);
  }
}

@keyframes slideOutToLeft {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-100px);
  }
}

.card-slide-in {
  animation: slideInFromRight 0.22s cubic-bezier(0.25, 0.46, 0.45, 0.94) both;
}

.card-slide-out {
  animation: slideOutToLeft 0.18s cubic-bezier(0.55, 0, 1, 0.45) both;
}

@keyframes slideInFromLeft {
  from {
    transform: translateX(-100px);
  }
  to {
    transform: translateX(0);
  }
}

.nav-slide-forward {
  animation: slideInFromRight 0.3s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.nav-slide-backward {
  animation: slideInFromLeft 0.3s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-slide-up {
  animation: fadeSlideUp 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94) both;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes popIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.screen-enter {
  animation: fadeSlideUp 0.3s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.modal-enter {
  animation: popIn 0.25s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.list-item-enter {
  animation: fadeSlideUp 0.3s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

/* Button click effect */
button:active:not(:disabled) {
  transform: scale(0.96);
  transition: transform 0.1s;
}

/* ?€?€?€ Result screen ?€?€?€ */
.result-circle-wrap {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 0 auto 1.5rem;
}
.result-circle { width: 120px; height: 120px; }
.result-circle-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-light);
}
#result-circle-dash {
  transition: stroke-dashoffset 1s ease;
}
.result-wrong-list {
  background: rgba(248, 113, 113, 0.06);
  border: 1px solid rgba(248, 113, 113, 0.2);
  border-radius: 12px;
  padding: 1rem;
  max-height: 180px;
  overflow-y: auto;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  text-align: left;
}
.result-wrong-list:empty { display: none; }

/* ?€?€?€ Short Answer ?€?€?€ */
.short-answer-wrap {
  display: flex;
  gap: 10px;
  align-items: stretch;
}
.short-answer-input {
  flex: 1;
  min-width: 0;
  background: rgba(255,255,255,0.06);
  border: 2px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 14px 18px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.short-answer-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.2);
}
.short-answer-input.correct {
  border-color: var(--success);
  box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.2);
}
.short-answer-input.wrong {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.2);
}
.short-submit-btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border: none;
  border-radius: 12px;
  color: white;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 14px 22px;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all 0.2s;
  box-shadow: 0 4px 14px var(--primary-glow);
}
.short-submit-btn:hover { transform: translateY(-2px); }
.short-submit-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.short-feedback {
  padding: 0 18px;
  max-height: 0;
  opacity: 0;
  margin-top: 0;
  overflow: hidden;
  border-radius: 12px;
  font-size: 0.92rem;
  line-height: 1.6;
  flex-shrink: 0;
  transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.short-feedback.show-feedback {
  padding: 14px 18px;
  max-height: 2000px;
  opacity: 1;
  margin-top: 1rem;
}
.short-feedback.correct-fb {
  background: rgba(74, 222, 128, 0.1);
  border: 1px solid rgba(74, 222, 128, 0.3);
  color: var(--success);
}
.short-feedback.wrong-fb {
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.3);
  color: var(--text);
}
.short-feedback .correct-label { color: var(--success); font-weight: 700; }
.short-feedback .wrong-label { color: var(--danger); font-weight: 700; }

/* ?€?€?€ Virtual Keyboard ?€?€?€ */
.vk-container {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 0.5rem;
  padding: 10px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all 0.3s ease;
}
.vk-container.hidden {
  display: none !important;
}
.vk-row {
  display: flex;
  justify-content: center;
  gap: 6px;
}
.vk-key {
  flex: 1;
  max-width: 40px;
  height: 44px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1.1rem;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  user-select: none;
  transition: background 0.1s, transform 0.1s;
}
.vk-key:active {
  background: rgba(255, 255, 255, 0.25);
  transform: scale(0.95);
}
.vk-key.vk-wide {
  flex: 1.5;
  max-width: 60px;
  font-size: 0.9rem;
}
.vk-key.vk-space {
  flex: 4;
  max-width: 200px;
}
.vk-key.vk-enter {
  background: rgba(108, 99, 255, 0.2);
  border-color: rgba(108, 99, 255, 0.4);
  color: var(--primary-light);
}

.vk-toggle-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.vk-toggle-label input {
  accent-color: var(--primary);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

/* ?€?€?€ Responsive ?€?€?€ */
@media (max-width: 600px) {
  .app-container { padding: 4px 4px 60px; gap: 4px; }
  .app-header { flex-direction: column; gap: 4px; padding: 2px 4px 6px; }
  .app-title { font-size: 1.2rem; }
  .app-subtitle { font-size: 0.75rem; }
  .card { padding: 16px; border-radius: 14px; }
  .options-grid { grid-template-columns: 1fr 1fr; }
  .generate-btn { padding: 12px 24px; }
  .download-section { flex-direction: column; }
  .words-card-grid { grid-template-columns: 1fr; gap: 0.4rem; }
  .word-card { padding: 0.65rem 0.75rem 0.55rem; border-radius: 10px; }
  .word-card-word { font-size: 1.65rem; }
  .test-modal-box { padding: 1.2rem; }
  .flashcard-front, .flashcard-back { font-size: 1.2rem; min-height: 160px; }
  .quiz-question-word { font-size: 1.5rem; }
  .words-action-bar { gap: 6px; }
  .hide-toggle-bar { border-radius: 12px; padding: 7px 10px; }
}









/* ?€?€?€ Library Grid & Cards ?€?€?€ */


/* ── Apple Liquid Glass Folders (.lib-card) ── */
.lib-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 20px;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s var(--spring-smooth), transform 0.12s var(--spring-smooth);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  position: relative;
  overflow: hidden;
}

.lib-card:hover {
  border-color: rgba(10, 132, 255, 0.3);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}
.lib-card:active {
  transform: scale(0.96);
}

.lib-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  z-index: 1;
}

.lib-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 0.5rem;
  z-index: 1;
  word-break: keep-all;
}

.lib-date {
  font-size: 0.8rem;
  color: var(--text-light);
  z-index: 1;
}

.lib-count {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: var(--bg-color);
  padding: 0.3rem 0.6rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  border: 1px solid var(--border-light);
  z-index: 1;
}

/* ?€?€?€ Mobile UI Scaling Tweak ?€?€?€ */
@media (max-width: 600px) {
  .hide-toggle-bar {
    padding: 6px;
  }
  .hide-toggle-label {
    font-size: 0.75rem;
  }
  .hide-toggle-btn {
    padding: 6px 10px;
    font-size: 0.8rem;
  }
}

/* ?€?€?€ Circle Action Buttons (Header) ?€?€?€ */
/* 🔘 Circle Action Buttons (Header) 🔘 */
.circle-action-btn {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  padding: 0;
  gap: 2px;
  flex-shrink: 0;
}
.circle-action-btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.2);
}
.circle-action-btn .icon {
  font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", "Android Emoji", sans-serif;
  font-size: 1.1rem;
  line-height: 1;
}
.circle-action-btn .label {
  font-size: 0.5rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  margin-top: 2px;
}

.related-item-pos {
  color: var(--primary);
  font-size: 0.8em;
  margin-left: 4px;
}

/* =============================================
   View Sliding Animations
   ============================================= */
.view-layer, .lib-layer {
  grid-area: 1 / 1;
  width: 100%;
  transition: transform 0.35s cubic-bezier(0.25, 1, 0.35, 1), opacity 0.35s ease;
  pointer-events: none;
  opacity: 0;
  position: absolute; /* Inactive layers do not affect grid height */
}

.view-layer.active-view, .lib-layer.active-lib {
  transform: none;
  opacity: 1;
  pointer-events: auto;
  z-index: 2;
  position: relative; /* Active layer sets the grid height */
}

.view-layer.idle-left, .lib-layer.idle-left {
  transform: translateX(-30%);
  opacity: 0;
  z-index: 1;
}

.view-layer.idle-right, .lib-layer.idle-right {
  transform: translateX(30%);
  opacity: 0;
  z-index: 1;
}

.lib-layer.hidden {
  display: none !important;
}

/* History Item Styles */
.history-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 1rem;
  overflow: hidden;
}
.history-summary {
  padding: 1rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s;
  user-select: none;
}
.history-summary:hover {
  background: rgba(255,255,255,0.05);
}
.history-header {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.history-title {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-primary);
}
.history-date {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.history-score {
  font-size: 0.95rem;
  font-weight: 500;
}
.history-wrong {
  margin-top: 0.8rem;
  padding: 0.8rem;
  background: rgba(239, 68, 68, 0.1);
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-primary);
  line-height: 1.4;
}

/* Hide state animations */
.word-section-word, .word-section-meaning, .word-section-example, .word-section-related {
  transition: filter 0.35s cubic-bezier(0.25, 1, 0.5, 1), opacity 0.3s ease, transform 0.35s cubic-bezier(0.25, 1, 0.5, 1);
}
/* ── Granular Hide States ── */

/* Example hide: blur the entire example section (both English + Korean) */
.hide-example-state .word-section-example .ex-en,
.hide-example-state .word-section-example .ex-ko {
  filter: blur(5px) grayscale(50%);
  opacity: 0.35;
  user-select: none;
  cursor: pointer;
  will-change: filter, opacity;
}
/* Keep section-level interaction affordance (click to peek on section) */
.hide-example-state .word-section-example {
  cursor: pointer;
  transform: scale(0.98);
  transition: transform 0.35s cubic-bezier(0.25, 1, 0.5, 1);
}

/* Meaning hide: blur meaning section + the Korean translation lines in examples */
.hide-meaning-state .word-section-meaning {
  filter: blur(5px) grayscale(50%);
  opacity: 0.35;
  user-select: none;
  cursor: pointer;
  transform: scale(0.98) translate3d(0, 0, 0);
  will-change: filter, opacity, transform;
}
.hide-meaning-state .word-section-example .ex-ko {
  filter: blur(5px) grayscale(50%);
  opacity: 0.35;
  user-select: none;
}

/* Word hide: blur word+etymology sections + the highlighted word inside English examples */
.hide-word-state .word-section-word,
.hide-word-state .word-section-etymology {
  filter: blur(5px) grayscale(50%);
  opacity: 0.35;
  user-select: none;
  cursor: pointer;
  transform: scale(0.98) translate3d(0, 0, 0);
  will-change: filter, opacity, transform;
}
.hide-word-state .word-section-example .ex-en strong {
  filter: blur(5px);
  opacity: 0.35;
  display: inline-block;
  user-select: none;
}

/* Related hide */
.hide-related-state .word-section-related {
  filter: blur(5px) grayscale(50%);
  opacity: 0.35;
  user-select: none;
  cursor: pointer;
  transform: scale(0.98) translate3d(0, 0, 0);
  will-change: filter, opacity, transform;
}

/* Peeking (tap to reveal) — restore all blurred elements */
.hide-word-state .word-section-word.peeking,
.hide-word-state .word-section-etymology.peeking,
.hide-meaning-state .word-section-meaning.peeking,
.hide-example-state .word-section-example.peeking,
.hide-related-state .word-section-related.peeking {
  filter: none !important;
  opacity: 1 !important;
  transform: scale(1) !important;
  transition: filter 0.2s ease-out, opacity 0.2s ease-out, transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
}
/* Peeking also clears inline-element blurs */
.hide-word-state .word-section-word.peeking ~ * .ex-en strong,
.hide-word-state .word-section-example.peeking .ex-en strong,
.hide-meaning-state .word-section-meaning.peeking ~ * .ex-ko,
.hide-example-state .word-section-example.peeking .ex-en,
.hide-example-state .word-section-example.peeking .ex-ko {
  filter: none !important;
  opacity: 1 !important;
}

.custom-toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(20px) scale(0.95);
  background: rgba(40,40,45,0.9);
  color: white;
  padding: 12px 24px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
  z-index: 10000;
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
  backdrop-filter: blur(10px);
}
.custom-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0) scale(1);
}
body[data-theme="light"] .custom-toast {
  background: rgba(255,255,255,0.95);
  color: #111;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  text-align: center;
  color: var(--text-secondary);
  width: 100%;
}
.empty-state-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.8;
}
.empty-state-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 8px 0;
  letter-spacing: -0.015em;
}
.empty-state-desc {
  font-size: 14px;
  margin: 0;
  line-height: 1.47;
}

.hide-toggle-btn:active,
.lib-card:active,
.chapter-card:active,
.circle-action-btn:active,
.test-mode-btn:active,
.generate-btn:active,
.modal-save-btn:active,
.word-card-edit-btn:active,
.word-card-delete-btn:active,
.quiz-choice-btn:active,
.flash-correct-btn:active,
.flash-wrong-btn:active,
.lib-delete-btn:active,
button:active {
  transform: scale(0.97);
  transition: transform 0.12s cubic-bezier(0.25, 1, 0.5, 1);
}

/* Unified Modal Sheet Styles (Apple HIG) */
.sheet-modal {
  margin: 0 auto;
  width: 100%;
  max-width: 640px;
  max-height: calc(var(--screen-height) * 0.92);
  box-sizing: border-box;
  padding: 0 24px calc(24px + var(--safe-bottom));
  border-radius: 24px 24px 0 0;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  position: relative;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.sheet-modal::before, .sheet-modal::after {
  display: none;
}

.sheet-modal > * {
  flex-shrink: 0;
}

.sheet-modal > *:not(:first-child) {
  overflow-y: visible;
}

.sheet-modal .option-card {
  min-width: 0;
  background: var(--bg-card);
  border-color: var(--border);
  border-radius: 12px;
}

.sheet-modal .select-input {
  min-width: 0;
  width: 100%;
  background: var(--bg-tertiary);
}

.sheet-modal .select-input option { background: var(--bg-secondary); }

.sheet-drag-bar {
  width: 36px;
  height: 5px;
  background: var(--border);
  border-radius: 3px;
  margin: 12px auto 16px;
}

body[data-theme='light'] .sheet-drag-bar {
  background: var(--border);
}

.sheet-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 16px !important;
  border-bottom: 1px solid var(--border);
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--bg-secondary);
}

.sheet-title {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text);
}

.sheet-close-btn {
  /* Visible icon is 28px but tap area is 44x44 for reliable touch */
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--bg-tertiary);
  border: none;
  color: var(--text-secondary);
  opacity: 1;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.2s;
  touch-action: manipulation; /* remove 300ms double-tap delay */
  position: relative;
  z-index: 20; /* sit above swipe handler layer */
  -webkit-tap-highlight-color: transparent;
}

.sheet-close-btn:hover,
.sheet-close-btn:active {
  opacity: 1;
}

.sheet-close-btn svg {
  width: 16px;
  height: 16px;
  fill: none;
  pointer-events: none;
  stroke: currentColor;
}

#test-setup .option-card > div {
  flex-wrap: wrap;
}

#test-setup .test-mode-btn {
  flex: 1 1 100px;
}

#history-list {
  max-height: none !important;
  overflow-y: visible !important;
  padding-right: 0 !important;
}

body:not([data-library-level="2"]) .hide-toggle-bar {
  display: none !important;
}
body.modal-open .hide-toggle-bar {
  /* Keep its measured bounds: Shorts sizes the card above this toolbar. */
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

button:focus-visible, select:focus-visible, input:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
}

/* Use desktop space without scaling the reference text and controls. */
@media (min-width: 960px) {
  .app-container { padding: 24px 40px 112px; }
  .ios-nav-bar { top: 16px; border: 1px solid var(--glass-border); border-radius: 14px; margin-bottom: 0; }
  .ios-nav-bar-inner {
    max-width: none; display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto auto;
    grid-template-rows: minmax(44px, auto); align-items: center;
    column-gap: 10px; min-height: 60px; padding: 6px 16px;
  }
  .ios-nav-inline { display: contents; }
  .ios-nav-back { grid-column: 1; grid-row: 1; max-width: min(180px, 18vw); }
  body[data-library-level="0"] .ios-nav-back { display: none; }
  .ios-nav-title-inline { grid-column: 2; grid-row: 1; text-align: left; }
  .ios-nav-actions { grid-column: 4; grid-row: 1; }
  .ios-large-title { display: contents !important; }
  .ios-large-title-text { font-size: 26px; }
  .ios-title-slot { grid-column: 2; grid-row: 1; width: auto; height: 32px; }
  #words-action-wrapper { grid-column: 3; grid-row: 1; min-width: 0; }
  .words-action-bar { gap: 6px; flex-wrap: nowrap; margin-bottom: 0 !important; }
  .circle-action-btn { width: auto; min-width: 0; height: 36px; flex-direction: row; gap: 4px; padding: 0 8px; }
  .circle-action-btn .icon { font-size: 14px; line-height: 1; }
  .circle-action-btn .label { font-size: 12px; }
  .ios-nav-bar.compact .ios-nav-bar-inner { min-height: 48px; padding: 2px 16px; }
  .words-card-grid {
    display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start; gap: 20px; padding-bottom: 40px;
  }
  .word-card { min-width: 0; padding: 24px; border: 1px solid var(--border); }
  #view-books, #view-chapters { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)) !important; gap: 20px !important; }
  .lib-card { min-height: 156px; padding: 28px; }
  #add-book-wrap, #add-chapter-wrap { margin-bottom: 24px !important; }
  #add-book-btn, #add-chapter-btn { min-height: 44px; padding: 10px 20px !important; }
  .ios-nav-action-btn:hover, .circle-action-btn:hover, .edit-circle-btn:hover {
    background: var(--bg-tertiary);
  }

  .modal-screen { justify-content: center; align-items: center; padding: 32px; }
  .modal-screen .sheet-modal {
    border-radius: 24px;
    max-height: calc(var(--screen-height) - 64px);
    padding: 0 28px 28px;
    transform: translateY(24px) scale(0.98);
    transition: transform 0.25s var(--spring-smooth);
  }
  .modal-screen.show .sheet-modal { transform: none; }
  .modal-screen.hidden .sheet-modal { transform: translateY(24px) scale(0.98); }
  .sheet-modal .sheet-drag-bar { display: none; }
  .sheet-header { padding-top: 24px !important; }

  body.shorts-mode-active .ios-nav-bar { margin-bottom: 0; top: 0; }
}

@media (max-width: 959px) {
  html {
    --gui-scale: 0.805;
    --screen-height: calc(100dvh / var(--gui-scale));
    --screen-width: calc(100vw / var(--gui-scale));
    zoom: var(--gui-scale);
  }
  .app-container { padding: 4px 4px 60px; gap: 4px; }
  .words-card-grid { gap: 0.4rem; }
  .word-card { padding: 0.65rem 0.75rem 0.55rem; }
  .word-card-word { font-size: 1.65rem; }
}
.shorts-controls .shorts-step-btn { flex: 0 0 28px; font-size: 24px; padding: 0; }
.shorts-controls .swipe-counter { min-width: 44px; }
.shorts-controls-inner { gap: 2px; }
.word-card-section, .word-card-word { overflow-wrap: anywhere; }

/* Keep the original upright card when there is enough vertical space. */
@media (min-width: 600px) and (max-width: 959px) and (min-height: 651px), (min-width: 960px) and (min-height: 801px) {
  body.shorts-mode-active .swipe-card-wrap { width: min(100%, 520px); margin-inline: auto; }
}

/* Only short screens need the horizontal card and single-row tools. */
@media (min-width: 600px) and (max-width: 959px) and (max-height: 650px) {
  body.shorts-mode-active .ios-nav-bar-inner {
    max-width: none; display: grid;
    grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 0 12px;
  }
  body.shorts-mode-active .ios-nav-inline { grid-column: 1; min-width: 0; }
  body.shorts-mode-active .ios-large-title { display: contents !important; }
  body.shorts-mode-active .ios-title-slot { display: contents; }
  body.shorts-mode-active #words-action-wrapper { grid-column: 2; grid-row: 1; }
  body.shorts-mode-active .words-action-bar { flex-wrap: nowrap; gap: 4px; margin: 0 !important; }
  body.shorts-mode-active .circle-action-btn { width: 32px; height: 32px; min-width: 0; }
  body.shorts-mode-active .circle-action-btn .label { display: none; }
}
@media (min-width: 600px) and (max-width: 959px) and (max-height: 650px), (min-width: 960px) and (max-height: 800px) {
  body.shorts-mode-active #lib-views-container { margin-top: 8px; }
  body.shorts-mode-active .swipe-card { overflow: hidden; }
  body.shorts-mode-active .swipe-card-content {
    display: grid; grid-template-columns: minmax(180px, 0.8fr) minmax(0, 1.2fr);
    gap: 16px; padding: 12px; min-height: 0;
  }
  body.shorts-mode-active .swipe-card-primary,
  body.shorts-mode-active .swipe-card-details {
    min-height: 0; overflow-y: auto; overscroll-behavior: contain;
    padding: 4px; touch-action: pan-y pinch-zoom;
  }
  body.shorts-mode-active .swipe-card-details { border-left: 1px solid var(--border); padding-left: 16px; }
  body.shorts-mode-active .swipe-card-primary .word-card-header { position: relative; padding-right: 16px; }
  body.shorts-mode-active .swipe-card-primary .word-card-num { position: absolute; top: 0; right: 0; }
  body.shorts-mode-active .swipe-card-primary .word-section-etymology { margin-top: 4px; }
  body.shorts-mode-active .swipe-card-primary .ety-container { padding: 6px; }
  body.shorts-mode-active .swipe-card-primary .ety-chip { padding: 4px 8px; }
  body.shorts-mode-active .swipe-card-primary .ety-en { font-size: 1rem; }
  body.shorts-mode-active .hide-toggle-bar {
    width: min(720px, calc(var(--screen-width) - 32px)); display: flex; align-items: center;
    gap: 12px; bottom: calc(6px + var(--safe-bottom));
  }
  body.shorts-mode-active .hide-toggle-options { flex: 1; }
  body.shorts-mode-active .shorts-controls { flex: 1; }
}

/* A short split pane can use a horizontal card without widening the page header. */
@media (min-width: 480px) and (max-width: 599px) and (max-height: 650px) {
  body.shorts-mode-active .hide-toggle-bar {
    width: calc(var(--screen-width) - 24px); display: flex; align-items: center; gap: 8px;
    bottom: calc(6px + var(--safe-bottom));
  }
  body.shorts-mode-active .hide-toggle-options { flex: 1; }
  body.shorts-mode-active .shorts-controls { flex: 0 0 auto; }
  body.shorts-mode-active .shorts-controls .hide-toggle-btn { min-width: 24px; padding: 4px; }
  body.shorts-mode-active .shorts-controls .hide-toggle-btn span { display: none; }
  body.shorts-mode-active .swipe-card { overflow: hidden; }
  body.shorts-mode-active .swipe-card-content {
    display: grid; grid-template-columns: minmax(150px, 0.75fr) minmax(0, 1.25fr);
    min-height: 0; padding: 10px; gap: 10px;
  }
  body.shorts-mode-active .swipe-card-primary,
  body.shorts-mode-active .swipe-card-details {
    min-height: 0; overflow-y: auto; overscroll-behavior: contain; touch-action: pan-y pinch-zoom;
  }
  body.shorts-mode-active .swipe-card-details { border-left: 1px solid var(--border); padding-left: 10px; }
  body.shorts-mode-active .swipe-card-primary .word-card-header { position: relative; padding-right: 16px; }
  body.shorts-mode-active .swipe-card-primary .word-card-num { position: absolute; top: 0; right: 0; }
  body.shorts-mode-active .swipe-card-primary .word-section-etymology { margin-top: 4px; }
  body.shorts-mode-active .swipe-card-primary .ety-container { padding: 6px; }
  body.shorts-mode-active .swipe-card-primary .ety-chip { padding: 4px 8px; }
  body.shorts-mode-active .swipe-card-primary .ety-en { font-size: 1rem; }
}

/* Starting a test fills the web viewport, without entering browser fullscreen. */
body.test-open #test-modal { padding: 0; align-items: stretch; justify-content: stretch; background: var(--bg-secondary); }
body.test-open #test-modal .test-modal-box {
  width: 100%; max-width: none; height: var(--screen-height); max-height: none; margin: 0;
  border: 0; border-radius: 0; box-shadow: none; transform: none;
  padding: var(--safe-top) max(20px, var(--safe-right)) var(--safe-bottom) max(20px, var(--safe-left));
  overflow: hidden;
}
body.test-open #test-modal .sheet-drag-bar { display: none; }
body.test-open #test-modal .sheet-header { flex: 0 0 auto; padding-top: 12px !important; }
body.test-open #test-modal .test-screen:not(.hidden) {
  flex: 1 1 auto; min-height: 0; width: 100%; max-width: 960px;
  margin: 0 auto; overflow-y: auto; padding-bottom: 16px;
}
@media (max-height: 550px) {
  body.test-open #test-flash { gap: 0.5rem; }
  body.test-open .flashcard-container { min-height: 0; gap: 6px; }
  body.test-open .flashcard { flex: 1; min-height: 100px; }
  body.test-open .flashcard-front, body.test-open .flashcard-back { min-height: 100px; padding: 16px; }
  body.test-open #flash-close-btn { margin-top: 0 !important; flex-shrink: 0; }
}

@media (max-width: 599px) {
  .sheet-modal { padding-left: 20px; padding-right: 20px; }
  .sheet-modal .options-grid { grid-template-columns: 1fr; }
}

/* Primary Action Button Unified */
.primary-action-btn {
  width: 100%;
  height: 50px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 17px;
  background: #007AFF;
  color: #FFFFFF;
  border: none;
  cursor: pointer;
  transition: transform 0.12s cubic-bezier(0.25, 1, 0.5, 1), opacity 0.12s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.primary-action-btn:active {
  transform: scale(0.98);
  opacity: 0.9;
}

/* ==========================================================================
   Auth Screen (Apple HIG Style)
   ========================================================================== */

.auth-screen {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 10000;
  background: var(--bg-main);
}
.auth-screen.hidden {
  display: none !important;
}

.auth-container {
  width: 90%;
  max-width: 400px;
  background: var(--bg-card);
  border: 0.5px solid var(--border);
  border-radius: 24px;
  padding: 32px 24px;
  box-shadow: 0 16px 40px rgba(0,0,0,0.1);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.auth-header {
  text-align: center;
  margin-bottom: 32px;
  position: relative;
}

.auth-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
  font-family: 'Jua', 'Nunito', sans-serif;
}
.auth-subtitle {
  font-size: 15px;
  color: var(--text-sub);
}

.auth-tabs {
  display: flex;
  background: var(--bg-hover);
  border-radius: 12px;
  padding: 4px;
  margin-bottom: 24px;
}
.auth-tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  padding: 10px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-sub);
  cursor: pointer;
  transition: all 0.3s ease;
}
.auth-tab-btn.active {
  background: var(--bg-card);
  color: var(--text-main);
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.auth-input {
  width: 100%;
  background: var(--bg-main);
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 14px 16px;
  border-radius: 12px;
  font-size: 16px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-sizing: border-box;
}
.auth-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.2);
}

.auth-btn {
  width: 100%;
  padding: 14px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  transition: opacity 0.2s, transform 0.1s;
}
.auth-btn:active {
  transform: scale(0.98);
}
.auth-btn.primary-btn {
  background: var(--accent);
  color: #fff;
  margin-top: 8px;
}
.auth-btn.google-btn {
  background: #fff;
  color: #3c4043;
  border: 1px solid #dadce0;
}
[data-theme="dark"] .auth-btn.google-btn {
  background: #3c4043;
  color: #fff;
  border: 1px solid #5f6368;
}

.auth-divider {
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--text-sub);
  font-size: 13px;
  margin: 8px 0;
}
.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border);
}
.auth-divider span {
  padding: 0 10px;
}

.auth-text-btn {
  background: transparent;
  border: none;
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  margin-top: 8px;
}
.auth-text-btn:hover {
  text-decoration: underline;
}

.auth-error {
  margin-top: 16px;
  padding: 12px;
  background: rgba(255, 59, 48, 0.1);
  color: var(--danger);
  border-radius: 8px;
  font-size: 14px;
  text-align: center;
  border: 1px solid rgba(255, 59, 48, 0.2);
}

/* ========== LANDING SCREEN ========== */
.landing-screen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 100;
  padding: 20px;
  background-color: transparent;
}
.landing-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 400px;
}
.landing-logo {
  width: 120px;
  height: 120px;
  border-radius: 28px;
  margin-bottom: 24px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}
.landing-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--primary) 0%, #a252ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.landing-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 24px;
}
.landing-footer {
  margin-top: 40px;
  font-size: 0.85rem;
}
.landing-footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}
.landing-footer a:hover {
  color: var(--text-primary);
}
.landing-footer .divider {
  margin: 0 10px;
  color: var(--border);
}

/* Trace Mode */
#test-trace { display: flex; flex-direction: column; height: 100%; width: 100%; box-sizing: border-box; }
.trace-canvas-container { flex: 1; min-height: 250px; background: #1e293b; border-radius: 12px; margin-bottom: 12px; position: relative; overflow: hidden; touch-action: none; border: 2px dashed #475569; }
.trace-canvas { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
.trace-guide-layer { z-index: 1; pointer-events: none; }
.trace-draw-layer { z-index: 2; background: transparent; touch-action: none; }
.trace-label { position: absolute; top: 8px; left: 8px; background: rgba(0,0,0,0.5); padding: 4px 8px; border-radius: 4px; font-size: 12px; color: #cbd5e1; z-index: 10; pointer-events: none; }
.trace-clear-btn { position: absolute; top: 8px; right: 8px; background: rgba(239, 68, 68, 0.2); border: 1px solid rgba(239, 68, 68, 0.5); color: #fca5a5; padding: 4px 10px; border-radius: 4px; font-size: 12px; z-index: 10; cursor: pointer; }
.trace-clear-btn:hover { background: rgba(239, 68, 68, 0.4); }
.trace-acc-container { display: flex; gap: 10px; margin-bottom: 15px; }
.trace-acc-item { flex: 1; display: flex; flex-direction: column; gap: 4px; }
.trace-acc-label { font-size: 12px; color: var(--text-muted); }
.trace-acc-bar-bg { width: 100%; height: 6px; background: var(--bg-hover); border-radius: 3px; overflow: hidden; }
.trace-acc-bar-fill { height: 100%; width: 0%; background: var(--primary); transition: width 0.3s ease, background-color 0.3s ease; }

/* Premium Next Button */
.premium-next-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
  padding: 14px 24px;
  border-radius: 100px;
  border: none;
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, #007aff, #34c759);
  box-shadow: 0 8px 20px rgba(0, 122, 255, 0.3);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}
.premium-next-btn:active {
  transform: scale(0.96);
}
.premium-next-btn:disabled {
  background: var(--bg-hover);
  color: var(--text-muted);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
  opacity: 0.7;
}
.premium-next-btn svg {
  transition: transform 0.3s ease;
}
.premium-next-btn:not(:disabled):hover svg {
  transform: translateX(4px);
}