/* ==========================================================================
   CSS Design System & Styles for 瞬間韓国語マスター
   ========================================================================== */

:root {
  /* Color Palette - Dark Theme (Default) */
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: rgba(26, 34, 52, 0.85);
  --bg-card-border: rgba(255, 255, 255, 0.08);
  --bg-hover: rgba(255, 255, 255, 0.06);
  --bg-active: rgba(255, 255, 255, 0.12);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-secondary: #10b981;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  --korean-accent: #38bdf8;
  --japanese-accent: #f43f5e;
  --fav-gold: #fbbf24;

  --card-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.5), 0 0 1px 1px rgba(255, 255, 255, 0.08);
  --glass-blur: blur(16px);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --font-en: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-kr: 'Noto Sans KR', 'Apple SD Gothic Neo', sans-serif;
  --font-jp: 'Noto Sans JP', 'Hiragino Sans', sans-serif;

  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

body.light-theme {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-border: rgba(0, 0, 0, 0.08);
  --bg-hover: rgba(0, 0, 0, 0.04);
  --bg-active: rgba(0, 0, 0, 0.08);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --card-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.08), 0 0 1px 1px rgba(0, 0, 0, 0.05);
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-jp);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(168, 85, 247, 0.1) 0%, transparent 40%);
  background-attachment: fixed;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* App Container */
.app-container {
  width: 100%;
  max-width: 820px;
  min-height: 100vh;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Header */
.header {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-bottom: 6px;
  width: 100%;
}

.header-top-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  gap: 10px;
}

.app-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 1;
  min-width: 0;
}

.logo-badge {
  background: var(--accent-gradient);
  color: #fff;
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  padding: 3px 6px;
  border-radius: var(--radius-sm);
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
  flex-shrink: 0;
}

.app-title {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-top-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.header-sub-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  gap: 8px;
}

/* Unlock Status Button */
.unlock-status-btn {
  background: rgba(16, 185, 129, 0.1);
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 7px 12px;
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
  flex: 1;
  justify-content: center;
}

body.dark-theme .unlock-status-btn {
  color: #34d399;
}

.unlock-status-btn:hover {
  background: rgba(16, 185, 129, 0.2);
  border-color: #10b981;
}

.unlock-hint-label {
  font-size: 0.72rem;
  font-weight: 400;
  opacity: 0.75;
}

/* Admin Button */
.admin-btn {
  background: rgba(251, 191, 36, 0.15);
  color: #d97706;
  border: 1px solid rgba(251, 191, 36, 0.35);
  padding: 6px 10px;
  border-radius: var(--radius-md);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all var(--transition-fast);
}

body.dark-theme .admin-btn {
  color: #fbbf24;
}

.admin-btn:hover {
  background: rgba(251, 191, 36, 0.25);
  border-color: #f59e0b;
}

.admin-btn.is-admin {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.4);
}

.icon-btn {
  background: var(--bg-hover);
  color: var(--text-secondary);
  border: 1px solid var(--bg-card-border);
  padding: 7px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.icon-btn-compact {
  padding: 6px 9px;
  font-size: 0.85rem;
}

.list-jump-btn {
  flex: 1;
  justify-content: center;
}

.icon-btn:hover {
  background: var(--bg-active);
  color: var(--text-primary);
  border-color: rgba(0, 0, 0, 0.15);
}

body.dark-theme .icon-btn:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.icon-btn:hover {
  background: var(--bg-active);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Theme Toggle */
.moon-icon { display: inline-block; }
.sun-icon { display: none; }
body.light-theme .moon-icon { display: none; }
body.light-theme .sun-icon { display: inline-block; }

/* Mode Tabs */
.controls-top {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mode-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg-secondary);
  padding: 5px;
  border-radius: var(--radius-md);
  border: 1px solid var(--bg-card-border);
}

.mode-tab {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.mode-tab:hover {
  color: var(--text-primary);
}

.mode-tab.active {
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  border: 1px solid var(--bg-card-border);
}

.tab-flag {
  font-size: 0.9rem;
}

/* Filter Bar */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.filter-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.styled-select {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--bg-card-border);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
  font-family: inherit;
  transition: border-color var(--transition-fast);
}

.styled-select:focus {
  border-color: var(--accent-primary);
}

.chip-btn {
  background: var(--bg-hover);
  color: var(--text-secondary);
  border: 1px solid var(--bg-card-border);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.chip-btn:hover {
  background: var(--bg-active);
  color: var(--text-primary);
}

.chip-btn.active {
  background: rgba(99, 102, 241, 0.2);
  color: #818cf8;
  border-color: rgba(99, 102, 241, 0.5);
}

/* Progress Indicator */
.progress-container {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.progress-bar-bg {
  width: 100%;
  height: 4px;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent-gradient);
  width: 1%;
  transition: width var(--transition-normal);
}

.progress-text {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-en);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.filter-desc-tag {
  font-family: var(--font-jp);
  font-size: 0.75rem;
  padding: 2px 8px;
  background: var(--bg-hover);
  border-radius: var(--radius-sm);
}

/* Flashcard */
.card-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  margin: 8px 0;
}

.flashcard {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--card-shadow);
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.badge-num {
  font-family: var(--font-en);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.12);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(99, 102, 241, 0.25);
}

.card-fav-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-fav-btn:hover {
  color: var(--fav-gold);
  transform: scale(1.15);
}

.card-fav-btn.active {
  color: var(--fav-gold);
  fill: var(--fav-gold);
}
.card-fav-btn.active svg {
  fill: var(--fav-gold);
}

/* Phrase Boxes */
.phrase-box {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.phrase-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.phrase-role-badge {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
}

.question-badge {
  background: rgba(244, 63, 94, 0.15);
  color: #fb7185;
  border: 1px solid rgba(244, 63, 94, 0.3);
}

.answer-badge {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.audio-play-btn {
  background: var(--bg-hover);
  border: 1px solid var(--bg-card-border);
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.audio-play-btn:hover {
  background: var(--accent-primary);
  color: #fff;
  border-color: var(--accent-primary);
}

.audio-play-btn.playing {
  background: var(--accent-primary);
  color: #fff;
}

/* Audio wave animation */
.wave-anim {
  display: none;
  align-items: center;
  gap: 2px;
  height: 12px;
}

.audio-play-btn.playing .play-icon {
  display: none;
}

.audio-play-btn.playing .wave-anim {
  display: flex;
}

.wave-anim span {
  width: 3px;
  height: 100%;
  background-color: #fff;
  border-radius: 1px;
  animation: wave 1s infinite ease-in-out;
}

.wave-anim span:nth-child(1) { animation-delay: 0.0s; }
.wave-anim span:nth-child(2) { animation-delay: 0.2s; }
.wave-anim span:nth-child(3) { animation-delay: 0.4s; }

@keyframes wave {
  0%, 100% { height: 4px; }
  50% { height: 14px; }
}

.phrase-content {
  min-height: 60px;
  display: flex;
  align-items: center;
}

.phrase-text {
  font-size: 1.5rem;
  line-height: 1.5;
  font-weight: 500;
  transition: filter var(--transition-fast);
}

.text-korean {
  font-family: var(--font-kr);
  font-weight: 600;
  color: var(--korean-accent);
}

.text-japanese {
  font-family: var(--font-jp);
  color: var(--text-primary);
}

/* Mask effect */
.phrase-text.masked {
  filter: blur(8px);
  user-select: none;
  cursor: pointer;
}

.phrase-text.masked:hover {
  filter: blur(4px);
}

/* Divider & Thinking Gauge */
.card-divider {
  position: relative;
  height: 2px;
  background: var(--bg-secondary);
  border-radius: var(--radius-full);
  margin: 4px 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.thinking-gauge {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  background: var(--accent-secondary);
  box-shadow: 0 0 10px var(--accent-secondary);
  border-radius: var(--radius-full);
  transition: width 0.05s linear;
}

.divider-label {
  position: absolute;
  background: var(--bg-card);
  padding: 2px 10px;
  font-size: 0.7rem;
  font-family: var(--font-en);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-full);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.divider-label.active {
  opacity: 1;
  color: var(--accent-secondary);
  border-color: rgba(16, 185, 129, 0.4);
}

/* Hidden Answer Prompt */
.answer-hidden-prompt {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 1.05rem;
  cursor: pointer;
  padding: 14px 20px;
  background: var(--bg-hover);
  border: 1px dashed var(--bg-card-border);
  border-radius: var(--radius-md);
  width: 100%;
  transition: all var(--transition-fast);
}

.answer-hidden-prompt:hover {
  background: var(--bg-active);
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

/* Controls Bottom */
.controls-bottom {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.nav-controls {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr 1fr;
  gap: 10px;
}

.nav-btn {
  border: none;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.primary-btn {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
}

.primary-btn:hover {
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
  transform: translateY(-1px);
}

.primary-btn:active {
  transform: translateY(1px);
}

.secondary-btn {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--bg-card-border);
}

.secondary-btn:hover {
  background: var(--bg-active);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Auto Play Bar */
.auto-play-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-secondary);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--bg-card-border);
  flex-wrap: wrap;
  gap: 10px;
}

.auto-play-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.auto-play-btn {
  background: var(--accent-secondary);
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.auto-play-btn:hover {
  background: #059669;
}

.auto-play-btn.running {
  background: #f43f5e;
  box-shadow: 0 4px 12px rgba(244, 63, 94, 0.3);
}

.auto-status-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.speed-selector {
  display: flex;
  align-items: center;
  gap: 4px;
}

.speed-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-right: 4px;
}

.speed-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-en);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.speed-btn:hover {
  color: var(--text-primary);
}

.speed-btn.active {
  background: var(--bg-card);
  color: var(--accent-primary);
  border-color: var(--bg-card-border);
}

/* Shortcuts hint */
.shortcuts-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

kbd {
  background: var(--bg-secondary);
  border: 1px solid var(--bg-card-border);
  color: var(--text-secondary);
  font-family: var(--font-en);
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 4px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* Modal Dialog */
.modal {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  border: none;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}

.modal[open] {
  display: flex;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
  width: 100%;
  max-width: 500px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-large {
  max-width: 720px;
  height: 80vh;
}

.modal-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--bg-card-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  font-size: 1.15rem;
  font-weight: 700;
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}

.modal-close-btn:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  overflow-y: auto;
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.setting-group label {
  display: flex;
  justify-content: space-between;
  font-size: 0.95rem;
  font-weight: 600;
}

.setting-val {
  color: var(--accent-secondary);
  font-family: var(--font-en);
}

.setting-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
}

input[type="range"] {
  accent-color: var(--accent-primary);
  width: 100%;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--bg-card-border);
  display: flex;
  justify-content: flex-end;
}

/* Search Box & List */
.search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-md);
  padding: 10px 14px;
}

.search-box input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 0.95rem;
  width: 100%;
  font-family: inherit;
}

.phrase-list-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
  max-height: 55vh;
  padding-right: 4px;
}

.phrase-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.phrase-list-item:hover {
  background: var(--bg-hover);
  border-color: var(--accent-primary);
}

.phrase-list-item.active {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.15);
}

.list-item-left {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.list-item-ko {
  font-family: var(--font-kr);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--korean-accent);
}

.list-item-ja {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.list-item-num {
  font-family: var(--font-en);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Input controls */
.styled-input {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--bg-card-border);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition-fast);
}

.styled-input:focus {
  border-color: var(--accent-primary);
}

/* Feedback message */
.feedback-msg {
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
}
.feedback-msg.error {
  background: rgba(244, 63, 94, 0.15);
  color: #fb7185;
  border: 1px solid rgba(244, 63, 94, 0.3);
}
.feedback-msg.success {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

/* Admin Generator Box */
.admin-gen-box {
  background: var(--bg-secondary);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.gen-input-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.gen-result-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-sm);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.gen-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.gen-code-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.gen-code {
  font-family: var(--font-en);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--accent-secondary);
  letter-spacing: 0.05em;
  background: rgba(16, 185, 129, 0.1);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  border: 1px dashed rgba(16, 185, 129, 0.3);
}

/* Admin Quick Table */
.quick-passwords-section {
  display: flex;
  flex-direction: column;
}

.quick-table-container {
  max-height: 200px;
  overflow-y: auto;
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-sm);
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  text-align: left;
}

.admin-table th, .admin-table td {
  padding: 8px 14px;
  border-bottom: 1px solid var(--bg-card-border);
}

.admin-table th {
  background: var(--bg-secondary);
  color: var(--text-muted);
  font-weight: 600;
  position: sticky;
  top: 0;
}

.admin-table tr:hover td {
  background: var(--bg-hover);
}

.admin-table code {
  font-family: var(--font-en);
  color: var(--accent-secondary);
  font-weight: 600;
}

/* Locked Card Overlay */
.card-locked-overlay {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 30px;
  text-align: center;
}

.locked-icon {
  font-size: 2.5rem;
}

.locked-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.locked-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  max-width: 400px;
}

/* Responsive */
@media (max-width: 640px) {
  .app-container {
    padding: 10px 12px;
    gap: 12px;
  }

  .header {
    gap: 8px;
  }

  .header-top-row {
    gap: 6px;
  }

  .app-title {
    font-size: 1.05rem;
  }

  .logo-badge {
    font-size: 0.65rem;
    padding: 2px 5px;
  }

  .header-top-actions {
    gap: 4px;
  }

  .admin-btn {
    font-size: 0.74rem;
    padding: 5px 8px;
  }

  .icon-btn-compact {
    padding: 5px 7px;
  }

  .header-sub-row {
    gap: 6px;
  }

  .unlock-status-btn {
    font-size: 0.76rem;
    padding: 6px 8px;
  }

  .unlock-hint-label {
    display: none; /* スマホでは省スペースのため非表示 */
  }

  .list-jump-btn {
    font-size: 0.76rem;
    padding: 6px 8px;
  }

  .mode-tab {
    font-size: 0.85rem;
    padding: 8px 6px;
    gap: 4px;
  }

  .tab-title {
    font-size: 0.85rem;
  }

  .filter-bar {
    gap: 6px;
  }

  .chip-btn {
    font-size: 0.75rem;
    padding: 5px 8px;
  }

  .styled-select {
    font-size: 0.8rem;
    padding: 5px 8px;
  }

  .flashcard {
    padding: 18px 16px;
    gap: 14px;
  }

  .phrase-text {
    font-size: 1.25rem;
    line-height: 1.45;
  }

  .nav-controls {
    grid-template-columns: 1fr 1.6fr 1fr;
    gap: 8px;
  }

  .nav-btn {
    padding: 12px 10px;
    font-size: 0.9rem;
  }

  .nav-controls #replayBtn {
    display: none;
  }

  .auto-play-bar {
    padding: 8px 12px;
  }
}