/* ===================================================================
   VocabMaster — 背單字 App Design System
   Minimalist Swiss Style · Monochromatic · Mobile PWA
   =================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+TC:wght@400;500;700&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  /* ── colours (dark theme — premium luxury) ── */
  --bg-primary:    #0a0a0a;
  --bg-secondary:  #121212;
  --bg-card:       transparent;
  --bg-card-hover: rgba(255, 255, 255, 0.02);
  --bg-elevated:   rgba(255, 255, 255, 0.03);
  --bg-glass:      rgba(10, 10, 10, 0.85);

  --text-primary:   #F5F5F0;
  --text-secondary: #A3A39E;
  --text-muted:     #666666;

  --accent:         #D4AF37; /* Champagne Gold */
  --accent-light:   #F3E5AB;
  --accent-glow:    rgba(212, 175, 55, 0.1);

  --success:        #F5F5F0;
  --success-glow:   transparent;
  --warning:        #D4AF37;
  --danger:         #F5F5F0;
  --danger-glow:    transparent;

  --gradient-primary: linear-gradient(135deg, #1A1A1A, #2A2A2A);
  --gradient-warm:    linear-gradient(135deg, #1A1A1A, #2A2A2A);
  --gradient-cool:    linear-gradient(135deg, #1A1A1A, #2A2A2A);
  --gradient-bg:      #0a0a0a;

  /* ── spacing & radius (sharp, sophisticated edges) ── */
  --radius-sm:  0px;
  --radius-md:  2px;
  --radius-lg:  4px;
  --radius-xl:  8px;
  --radius-full: 9999px;

  /* ── shadows (removed for editorial flat design) ── */
  --shadow-sm:   none;
  --shadow-md:   none;
  --shadow-lg:   none;
  --shadow-glow: none;

  /* ── iOS spring animation (CSS approximation via cubic‑bezier) ── */
  --spring:          cubic-bezier(0.34, 1.56, 0.64, 1);
  --spring-soft:     cubic-bezier(0.25, 1.2, 0.5, 1);
  --spring-bounce:   cubic-bezier(0.18, 1.8, 0.5, 1);
  --spring-gentle:   cubic-bezier(0.22, 1.0, 0.36, 1);
  --ease-out-expo:   cubic-bezier(0.16, 1, 0.3, 1);

  /* ── layout ── */
  --safe-top:    env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --tab-height:  68px;
  --max-width:   430px;

  /* ── fonts ── */
  --font-sans: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  --font-serif: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  --font: var(--font-sans);
}

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


html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font);
  background: var(--gradient-bg);
  color: var(--text-primary);
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  user-select: none;
  -webkit-user-select: none;
}

/* ---------- App Shell ---------- */
#app {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ---------- Pages Container ---------- */
.pages {
  flex: 1;
  position: relative;
  overflow: hidden;
  padding-bottom: var(--tab-height);
}

.page {
  position: absolute;
  inset: 0;
  padding: 20px 18px;
  padding-top: calc(var(--safe-top) + 20px);
  padding-bottom: calc(var(--tab-height) + 20px);
  overflow-y: auto;
  overflow-x: hidden;
  transform: translateY(30px) scale(0.96);
  opacity: 0;
  visibility: hidden;
  transition: transform 0.5s var(--spring),
              opacity 0.35s var(--ease-out-expo),
              visibility 0s 0.5s;
  will-change: transform, opacity;
  -webkit-overflow-scrolling: touch;
}

.page.active {
  transform: translateY(0) scale(1);
  opacity: 1;
  visibility: visible;
  transition: transform 0.5s var(--spring),
              opacity 0.35s var(--ease-out-expo),
              visibility 0s 0s;
}

/* Secondary pages (learn/quiz): no tab-bar, less bottom padding */
#page-learn, #page-quiz {
  padding-bottom: 20px;
}

/* ---------- Tab Bar ---------- */
.tab-bar {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--max-width);
  height: var(--tab-height);
  padding-bottom: var(--safe-bottom);
  display: flex;
  align-items: center;
  justify-content: space-around;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid rgba(255,255,255,0.06);
  z-index: 100;
  transition: transform 0.35s var(--ease-out-expo),
              opacity 0.25s ease;
}

.tab-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 500;
  font-family: var(--font);
  padding: 6px 14px;
  cursor: pointer;
  transition: color 0.3s, transform 0.4s var(--spring);
  -webkit-tap-highlight-color: transparent;
}

.tab-btn svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform 0.4s var(--spring-bounce);
}

.tab-btn.active {
  color: var(--text-primary);
}

.tab-btn.active svg {
  transform: scale(1.15);
}

.tab-btn:active {
  transform: scale(0.88);
}

.tab-bar.tab-bar-hidden {
  transform: translateX(-50%) translateY(100%);
  pointer-events: none;
  opacity: 0;
  transition: transform 0.35s var(--ease-out-expo),
              opacity 0.25s ease;
}

/* ---------- Cards ---------- */
.card {
  background: transparent;
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: none;
  border: 1px solid rgba(128,128,128,0.1);
  transition: transform 0.4s var(--spring), border-color 0.3s;
}

.card:active {
  transform: scale(0.98);
  border-color: rgba(128,128,128,0.3);
}

.card-glow {
  border: 1px solid var(--accent-light);
}

/* ---------- Home Page ---------- */
.home-header {
  text-align: center;
  padding: 10px 0 24px;
}

.home-header .greeting {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.home-header h1 {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-primary);
}

.streak-badge {
  display: none !important;
}

@keyframes badge-in {
  from { transform: scale(0) rotate(-20deg); opacity: 0; }
  to   { transform: scale(1) rotate(0); opacity: 1; }
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 16px 0;
}

.stat-card {
  background: transparent;
  border-radius: var(--radius-lg);
  padding: 20px;
  border: 1px solid rgba(128,128,128,0.1);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.stat-card:nth-child(1) { animation-delay: 0.05s; }
.stat-card:nth-child(2) { animation-delay: 0.1s; }
.stat-card:nth-child(3) { animation-delay: 0.15s; }

@keyframes stat-pop {
  from { transform: translateY(20px) scale(0.8); opacity: 0; }
  to   { transform: translateY(0) scale(1); opacity: 1; }
}

.stat-card .stat-value {
  font-size: 28px;
  font-weight: 800;
  line-height: 1;
}

.stat-card .stat-label {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 6px;
  font-weight: 500;
}

.stat-card:nth-child(1) .stat-value { color: var(--accent-light); }
.stat-card:nth-child(2) .stat-value { color: var(--success); }
.stat-card:nth-child(3) .stat-value { color: var(--warning); }

/* action buttons on home */
.action-btns {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px 20px;
  border: none;
  border-radius: var(--radius-lg);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.4s var(--spring),
              box-shadow 0.3s;
  -webkit-tap-highlight-color: transparent;
}

.action-btn:active {
  transform: scale(0.95) !important;
}

.action-btn.primary {
  background: transparent;
  color: var(--text-primary);
  box-shadow: none;
  border: 1px solid rgba(128,128,128,0.3);
}

.action-btn.secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(128,128,128,0.1);
}

.action-btn .btn-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.action-btn.primary .btn-icon {
  background: rgba(255,255,255,0.2);
}

.action-btn.secondary .btn-icon {
  background: transparent;
  border: 1px solid rgba(128,128,128,0.2);
}

.action-btn .btn-text {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.action-btn .btn-text small {
  font-size: 12px;
  font-weight: 400;
  color: rgba(255,255,255,0.65);
}

.action-btn.secondary .btn-text small {
  color: var(--text-secondary);
}

/* ---------- Learning Page ---------- */
.learn-header, .search-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  position: relative;
}

.learn-header .back-btn, .search-header .back-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  padding: 4px;
  transition: transform 0.3s var(--spring);
  -webkit-tap-highlight-color: transparent;
  display: flex;
  align-items: center;
  gap: 4px;
}

.learn-header .back-btn:active, .search-header .back-btn:active { transform: scale(0.9); }

.learn-right-controls {
  display: flex;
  gap: 8px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-full);
  padding: 4px 8px;
}

.icon-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 16px;
  cursor: pointer;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.2s;
}

.icon-btn:active { background: rgba(255,255,255,0.2); }

.learn-progress-text {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 24px;
  letter-spacing: 1px;
  opacity: 0.5;
}

/* Word Card */
.word-card-area {
  margin: 20px 0 40px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.word-card {
  width: 100%;
}

.word-card.bounce-in {
  animation: txt-bounce-in 0.6s var(--spring-bounce) both;
}

@keyframes txt-bounce-in {
  0%   { transform: translateY(30px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}

.word-card .word-text {
  font-family: var(--font-sans);
  font-style: normal;
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.word-phonetic-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
}

.word-phonetic {
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--accent);
  letter-spacing: 1px;
}

.word-phonetic-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.word-dots {
  display: none !important;
}

.learn-right-controls {
  display: none !important;
}

.action-pill-btn .btn-indicator {
  display: none !important;
}

.word-dots span {
  width: 14px;
  height: 4px;
  background: var(--accent-glow);
  border-radius: 2px;
}

.word-dots span:nth-child(2) { background: var(--accent-light); width: 20px; }

.word-card .word-phonetic {
  font-size: 16px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.speak-btn-inline {
  background: none;
  border: none;
  font-size: 16px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: transform 0.3s var(--spring-bounce), color 0.3s;
  -webkit-tap-highlight-color: transparent;
  padding: 4px;
}

.speak-btn-inline:active { transform: scale(1.4); color: var(--text-primary); }

/* Meanings (revealed) */
.meanings-area {
  margin-top: 10px;
  padding: 0 10px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 12px;
}

.meanings-area.hidden { display: none !important; }

.pos-tag {
  display: inline-flex;
  align-items: center;
  background: var(--accent);
  color: var(--bg-primary);
  font-size: 13px;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.5px;
  animation: slide-up 0.4s var(--spring) both;
}

.meaning-text {
  display: inline-flex;
  align-items: center;
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  animation: slide-up 0.4s var(--spring) both;
  animation-delay: 0.06s;
}

@keyframes slide-up {
  from { transform: translateY(15px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

/* examples */
.examples-area {
  margin-top: 16px;
}

.example-item {
  background: transparent;
  border-radius: var(--radius-sm);
  padding: 16px 0;
  margin-bottom: 4px;
  border-bottom: 1px solid rgba(128,128,128,0.2);
  animation: example-in 0.4s var(--spring) both;
}

.example-item:last-child {
  border-bottom: none;
}

.example-item:nth-child(1) { animation-delay: 0.1s; }
.example-item:nth-child(2) { animation-delay: 0.2s; }
.example-item:nth-child(3) { animation-delay: 0.3s; }

@keyframes example-in {
  from { transform: translateY(16px) scale(0.95); opacity: 0; }
  to   { transform: translateY(0) scale(1); opacity: 1; }
}

.example-item .example-en {
  font-family: var(--font-sans);
  font-style: normal;
  font-weight: 500;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.example-item .example-en mark {
  background: transparent;
  color: var(--accent);
  font-weight: 700;
  padding: 0;
  border-radius: 0;
  text-decoration: underline;
  text-decoration-color: var(--accent);
}

.example-item .example-zh {
  font-family: var(--font-sans);
  font-size: 14px;
  color: #8c8c9b; /* Distinct muted color for translation */
  line-height: 1.5;
  letter-spacing: 0.5px;
}

/* supplement info (root, phrase) */
.root-info {
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--bg-elevated);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  line-height: 1.5;
  display: flex;
  align-items: flex-start;
  text-align: left;
  gap: 12px;
  animation: slide-in 0.4s var(--spring) 0.35s both;
}

.root-info.hidden {
  display: none !important;
}

.root-info .root-icon {
  font-size: 14px;
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  margin-top: -2px;
}

.root-info .supp-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.root-info .supp-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.root-info .root-icon {
  font-size: 16px;
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  padding-bottom: 1px; /* Optical alignment */
}

/* Rating Buttons (Material You Pill Style) */
.rating-btns-container {
  margin-top: 32px;
  padding: 0 20px 24px;
  width: 100%;
}

.rating-btns-container.sticky-bottom-cta {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: calc(var(--safe-bottom) + 60px);
  width: min(var(--max-width), 100%);
  padding: 0 18px;
  z-index: 90;
}

.rating-btns {
  display: flex;
  justify-content: space-around;
  width: 100%;
}

.rating-btns.hidden { display: none; }

.action-pill-btn {
  background: none;
  border: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  padding: 10px 20px;
  animation: fade-up 0.4s ease-out both;
}

.action-pill-btn:nth-child(2) { animation-delay: 0.1s; }

@keyframes fade-up {
  from { transform: translateY(10px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

.action-pill-btn:active {
  transform: scale(0.92);
  transition: transform 0.1s;
}

.action-pill-btn .btn-label {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.action-pill-btn.next .btn-label { color: var(--text-primary); }

.action-pill-btn .btn-indicator {
  width: 24px;
  height: 4px;
  border-radius: 2px;
  background: var(--text-muted);
}

.action-pill-btn.next .btn-indicator {
  background: var(--text-primary);
}

.reveal-btn {
  width: 100%;
  padding: 16px;
  border: 1px solid rgba(128,128,128,0.3);
  border-radius: 0;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.4s var(--spring), background 0.3s;
  -webkit-tap-highlight-color: transparent;
}

.reveal-btn:active { 
  transform: scale(0.96); 
  background: rgba(128,128,128,0.05);
}
.reveal-btn.hidden { display: none; }

/* ---------- Search Page Styles ---------- */
.search-bar-container {
  display: flex;
  align-items: center;
  background: transparent;
  border-radius: var(--radius-xl);
  padding: 12px 16px;
  margin: 10px 0 20px;
  box-shadow: none;
  border: 1px solid rgba(128,128,128,0.2);
}

.search-icon {
  width: 20px;
  height: 20px;
  stroke: var(--text-muted);
  stroke-width: 2;
  fill: none;
  margin-right: 12px;
}

.search-input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 16px;
  outline: none;
}

.search-input::placeholder {
  color: var(--text-muted);
}

.clear-search-btn {
  background: transparent;
  border: 1px solid rgba(128,128,128,0.2);
  border: none;
  color: var(--text-secondary);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  font-size: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-results-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-bottom: 20px;
}

.search-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 8px 4px;
  border-bottom: 1px solid rgba(255,255,255,0.03);
  animation: txt-bounce-in 0.4s both;
}

.search-item-word {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.search-item-pos {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

.search-item-meaning {
  font-size: 14px;
  color: var(--text-secondary);
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}


/* ---------- Quiz Page ---------- */
.quiz-question {
  font-size: 14px;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 10px;
}

.quiz-word-display {
  text-align: center;
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 24px;
  animation: card-bounce-in 0.5s var(--spring-bounce) both;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.quiz-option {
  background: transparent;
  border: 1px solid rgba(128,128,128,0.2);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 12px;
  font-size: 16px;
  color: var(--text-primary);
  text-align: center;
  cursor: pointer;
  transition: transform 0.3s, background 0.3s;
  -webkit-tap-highlight-color: transparent;
}

.quiz-option:nth-child(1) { animation-delay: 0.05s; }
.quiz-option:nth-child(2) { animation-delay: 0.1s; }
.quiz-option:nth-child(3) { animation-delay: 0.15s; }
.quiz-option:nth-child(4) { animation-delay: 0.2s; }

@keyframes option-in {
  from { transform: translateX(-24px) scale(0.94); opacity: 0; }
  to   { transform: translateX(0) scale(1); opacity: 1; }
}

.quiz-option:active { transform: scale(0.96); }

.quiz-option.correct {
  border-color: var(--success);
  background: rgba(0,206,201,0.12);
  animation: correct-pop 0.45s var(--spring-bounce);
}

@keyframes correct-pop {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.04); }
  100% { transform: scale(1); }
}

.quiz-option.wrong {
  border-color: var(--danger);
  background: rgba(255,107,107,0.12);
  animation: shake 0.5s var(--spring);
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%      { transform: translateX(-8px); }
  40%      { transform: translateX(8px); }
  60%      { transform: translateX(-6px); }
  80%      { transform: translateX(4px); }
}

/* Spelling */
.spell-input-area {
  margin-top: 20px;
  display: flex;
  gap: 8px;
}

.spell-input {
  flex: 1;
  padding: 16px 18px;
  border: 2px solid var(--bg-elevated);
  border-radius: var(--radius-lg);
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 18px;
  font-weight: 600;
  outline: none;
  transition: border-color 0.3s;
}

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

.spell-submit {
  padding: 16px 20px;
  border: none;
  border-radius: var(--radius-lg);
  background: var(--text-primary);
  color: var(--bg-primary);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.3s var(--spring);
  -webkit-tap-highlight-color: transparent;
}

.spell-submit:active { transform: scale(0.92); }

.spell-result {
  margin-top: 14px;
  padding: 14px;
  border-radius: var(--radius-md);
  text-align: center;
  font-weight: 700;
  font-size: 15px;
}

.spell-result.correct-result {
  background: rgba(0,206,201,0.12);
  color: var(--success);
}

.spell-result.wrong-result {
  background: rgba(255,107,107,0.12);
  color: var(--danger);
}

/* ---------- Stats Page ---------- */
.stats-header {
  text-align: center;
  margin-bottom: 24px;
}

.stats-header h2 {
  font-size: 24px;
  font-weight: 800;
}

.chart-container {
  background: transparent;
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: none;
  border: 1px solid rgba(255,255,255,0.04);
}

.chart-container h3 {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 14px;
  font-weight: 600;
}

.chart-container canvas {
  width: 100%;
  height: 180px;
}

.word-list-section {
  margin-top: 20px;
}

.word-list-section h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
}

.word-list-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.wl-tab {
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius-full);
  background: transparent;
  border: 1px solid rgba(128,128,128,0.2);
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s var(--spring);
  -webkit-tap-highlight-color: transparent;
}

.wl-tab.active {
  background: var(--text-primary);
  color: var(--bg-primary);
}

.wl-tab:active { transform: scale(0.93); }

.word-list-items {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 300px;
  overflow-y: auto;
}

.wl-item {
  background: transparent;
  border-radius: var(--radius-lg);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  border: 1px solid rgba(128,128,128,0.1);
  transition: transform 0.3s;
}

.wl-item .wl-word {
  font-weight: 700;
  font-size: 16px;
}

.wl-item .wl-meaning {
  font-size: 13px;
  color: var(--text-secondary);
}

.wl-item .wl-status {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.wl-status.mastered { background: rgba(0,206,201,0.15); color: var(--success); }
.wl-status.learning { background: rgba(253,203,110,0.15); color: var(--warning); }
.wl-status.new-word { background: var(--accent-glow); color: var(--accent-light); }

/* ---------- Settings Page ---------- */
.settings-header {
  text-align: center;
  margin-bottom: 24px;
}

.settings-header h2 {
  font-size: 24px;
  font-weight: 800;
}

.settings-group {
  background: transparent;
  border-radius: var(--radius-lg);
  padding: 4px 0;
  margin-bottom: 16px;
  box-shadow: none;
  border: 1px solid rgba(255,255,255,0.04);
}

.setting-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}

.setting-item:last-child {
  border-bottom: none;
}

.setting-item .setting-label {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.setting-item .setting-label span:first-child {
  font-weight: 600;
  font-size: 15px;
}

.setting-item .setting-label small {
  font-size: 12px;
  color: var(--text-muted);
}

/* Toggle Switch */
.toggle {
  position: relative;
  width: 52px;
  height: 30px;
  flex-shrink: 0;
}

.toggle input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: transparent;
  border: 1px solid rgba(128,128,128,0.2);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background 0.35s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 24px;
  height: 24px;
  left: 3px;
  bottom: 3px;
  background: var(--text-primary);
  border-radius: 50%;
  transition: transform 0.35s var(--spring-bounce), background 0.35s;
  box-shadow: none;
}

.toggle input:checked + .toggle-slider {
  background: var(--text-primary);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(22px);
  background: var(--bg-primary);
}

/* Stepper */
.stepper {
  display: flex;
  align-items: center;
  gap: 12px;
}

.stepper button {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: transparent;
  border: 1px solid rgba(128,128,128,0.2);
  color: var(--text-primary);
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.3s var(--spring-bounce);
  -webkit-tap-highlight-color: transparent;
}

.stepper button:active { transform: scale(0.85); }

.stepper .stepper-value {
  font-size: 18px;
  font-weight: 700;
  min-width: 30px;
  text-align: center;
}

/* select */
.setting-select {
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--bg-elevated);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  outline: none;
}

/* ---------- Import Page ---------- */
.import-section {
  margin-top: 16px;
}

.import-section h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.import-section p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.5;
}

.import-area {
  position: relative;
  background: transparent;
  border: 2px dashed var(--bg-elevated);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  transition: border-color 0.3s, background 0.3s;
  cursor: pointer;
}

.import-area:hover, .import-area.dragover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.import-area .import-icon {
  font-size: 40px;
  margin-bottom: 10px;
}

.import-area p {
  color: var(--text-secondary);
  font-size: 14px;
}

.import-textarea {
  width: 100%;
  min-height: 140px;
  padding: 16px;
  border: 2px solid var(--bg-elevated);
  border-radius: var(--radius-lg);
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.6;
  resize: vertical;
  outline: none;
  transition: border-color 0.3s;
}

.import-textarea:focus {
  border-color: var(--accent);
}

.import-textarea::placeholder {
  color: var(--text-muted);
}

.import-btn {
  width: 100%;
  padding: 16px;
  margin-top: 12px;
  border: none;
  border-radius: var(--radius-lg);
  background: var(--text-primary);
  color: var(--bg-primary);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.4s var(--spring);
  -webkit-tap-highlight-color: transparent;
}

.import-btn:active { transform: scale(0.95); }

.import-result {
  margin-top: 12px;
  padding: 12px;
  border-radius: var(--radius-md);
  text-align: center;
  font-weight: 600;
  font-size: 14px;
  animation: slide-in 0.3s var(--spring);
}

.import-result.success {
  background: rgba(0,206,201,0.12);
  color: var(--success);
}

.import-result.error {
  background: rgba(255,107,107,0.12);
  color: var(--danger);
}

.format-hint {
  background: transparent;
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-top: 14px;
  border: 1px solid rgba(255,255,255,0.04);
}

.format-hint code {
  display: block;
  font-size: 12px;
  color: var(--text-primary);
  background: transparent;
  border: 1px solid rgba(128,128,128,0.2);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  margin-top: 8px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-all;
}

/* ---------- Word Book Selector ---------- */
.book-selector {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 2px 12px;
  margin: 0 -2px;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.book-selector::-webkit-scrollbar { display: none; }

.book-chip {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 2px solid var(--bg-elevated);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.35s var(--spring);
  -webkit-tap-highlight-color: transparent;
  white-space: nowrap;
}

.book-chip:active { transform: scale(0.92); }

.book-chip.active {
  border-color: var(--accent);
  background: var(--accent-glow);
  color: var(--text-primary);
  box-shadow: none;
}

.book-chip .chip-icon { font-size: 16px; }
.book-chip .chip-count {
  font-size: 11px;
  opacity: 0.7;
  font-weight: 500;
}

/* ---------- Book Manager (Settings) ---------- */
.book-manager {
  margin-top: 16px;
  margin-bottom: 16px;
}

.book-manager h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.book-manager p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.5;
}

.book-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.book-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: transparent;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.04);
  animation: slide-in 0.35s var(--spring) both;
}

.book-list-item .book-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.book-list-item .book-icon {
  font-size: 22px;
}

.book-list-item .book-name {
  font-weight: 700;
  font-size: 15px;
}

.book-list-item .book-count {
  font-size: 12px;
  color: var(--text-muted);
}

.book-list-item .book-delete {
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: rgba(255,107,107,0.12);
  color: var(--danger);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s var(--spring), background 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.book-list-item .book-delete:active {
  transform: scale(0.85);
  background: rgba(255,107,107,0.25);
}

/* ---------- Import Target ---------- */
.import-target {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  padding: 12px 16px;
  background: transparent;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.04);
}

.import-target label {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  color: var(--text-secondary);
}

.import-target select {
  flex: 1;
}

/* ---------- Create Book Modal ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0s 0.3s;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.3s, visibility 0s 0s;
}

.modal {
  background: var(--bg-primary);
  width: 90%;
  max-width: 360px;
  border-radius: var(--radius-xl);
  padding: 24px;
  transform: scale(0.95);
  opacity: 0;
  transition: transform 0.4s var(--spring), opacity 0.3s;
  border: 1px solid rgba(128,128,128,0.1);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 800;
}

.modal-close {
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: transparent;
  border: 1px solid rgba(128,128,128,0.2);
  color: var(--text-secondary);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s var(--spring);
  -webkit-tap-highlight-color: transparent;
}

.modal-close:active { transform: scale(0.85); }

.modal-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.modal-input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--bg-elevated);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 600;
  outline: none;
  transition: border-color 0.3s;
  margin-bottom: 16px;
}

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

.modal-input::placeholder {
  color: var(--text-muted);
  font-weight: 400;
}

.icon-picker {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  margin-bottom: 20px;
}

.icon-option {
  width: 44px;
  height: 44px;
  border: 2px solid var(--bg-elevated);
  border-radius: var(--radius-md);
  background: transparent;
  font-size: 22px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s var(--spring);
  -webkit-tap-highlight-color: transparent;
}

.icon-option:active { transform: scale(0.85); }

.icon-option.active {
  border-color: var(--accent);
  background: var(--accent-glow);
  box-shadow: none;
}

/* (Legacy modal styles removed — using new Create Book Modal above) */


/* ---------- Toast ---------- */
.toast {
  position: fixed;
  top: calc(var(--safe-top) + 16px);
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  padding: 12px 24px;
  background: transparent;
  color: var(--text-primary);
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 600;
  box-shadow: none;
  z-index: 300;
  transition: transform 0.5s var(--spring-bounce);
  white-space: nowrap;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

/* ---------- Complete Screen ---------- */
.complete-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}

.complete-emoji {
  font-size: 72px;
  animation: trophy-bounce 0.8s var(--spring-bounce);
}

@keyframes trophy-bounce {
  0%   { transform: scale(0) rotate(-30deg); }
  60%  { transform: scale(1.2) rotate(5deg); }
  100% { transform: scale(1) rotate(0); }
}

.complete-title {
  font-size: 28px;
  font-weight: 800;
  margin-top: 16px;
  background: var(--text-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.complete-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin-top: 8px;
}

.complete-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  width: 100%;
  margin-top: 28px;
}

.complete-stat-item {
  background: transparent;
  border-radius: var(--radius-md);
  padding: 16px;
  animation: stat-pop 0.5s var(--spring-bounce) both;
}

.complete-stat-item:nth-child(1) { animation-delay: 0.3s; }
.complete-stat-item:nth-child(2) { animation-delay: 0.4s; }

.complete-stat-item .cs-value {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-primary);
}

.complete-stat-item .cs-label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg-elevated); border-radius: 4px; }

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

.text-gradient {
  color: var(--text-primary);
}

/* ---------- Ripple Effect (iOS-like feedback) ---------- */
.ripple {
  position: relative;
  overflow: hidden;
}

.ripple::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--ripple-x, 50%) var(--ripple-y, 50%),
              rgba(255,255,255,0.15) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.5s;
}

.ripple:active::after {
  opacity: 1;
  transition: opacity 0s;
}

/* ---------- iOS-like spring pull-down refresh indicator ---------- */
.pull-indicator {
  text-align: center;
  padding: 10px;
  font-size: 13px;
  color: var(--text-muted);
  transition: transform 0.5s var(--spring-bounce);
}

/* ---------- Empty state ---------- */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
}

.empty-state .empty-icon {
  font-size: 56px;
  margin-bottom: 12px;
}

.empty-state p {
  font-size: 15px;
  line-height: 1.6;
}

/* General SVG icon reset */
svg.inline-icon {
  width: 1em;
  height: 1em;
  vertical-align: -0.125em;
  display: inline-block;
}
.btn-icon svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
}
.complete-emoji svg {
  width: 64px;
  height: 64px;
  stroke: currentColor;
}