/* Minimalist NCE UI — Inspired by modern clean design */
:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --card: #ffffff;
  --text: #09090b;
  --muted: #71717a;
  --border: #e4e4e7;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.15);
  --accent: #3b82f6;
  --radius: 8px;
  --control-h: 34px;
  --content-max: 780px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #09090b;
    --surface: #18181b;
    --card: #18181b;
    --text: #fafafa;
    --muted: #a1a1aa;
    --border: #27272a;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.5);
  }
}

/* 强制深色主题 class - 优先级高于媒体查询 */
html.dark-theme,
body.dark-theme {
  --bg: #09090b;
  --surface: #18181b;
  --card: #18181b;
  --text: #fafafa;
  --muted: #a1a1aa;
  --border: #27272a;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.5);
}

/* 强制浅色主题 class */
html.light-theme,
body.light-theme {
  --bg: #ffffff;
  --surface: #ffffff;
  --card: #ffffff;
  --text: #09090b;
  --muted: #71717a;
  --border: #e4e4e7;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.15);
}

* {
  box-sizing: border-box
}

/* Accessibility: focus indicators */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

/* Screen-reader only utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

html,
body {
  height: 100%
}

html {
  background-color: var(--bg);
}

[hidden] {
  display: none !important
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background-color: var(--bg);
  min-height: 100vh;
  padding: 20px;
  position: relative;
}

/* Canvas background */
#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

/* Header */
.hero {
  padding: 40px 0 24px;
  text-align: center;
  position: relative
}

.hero h1 {
  font-size: 2.5rem;
  color: var(--text);
  font-weight: 600;
  margin: 0 0 10px;
  letter-spacing: -0.02em;
}

.hero p {
  color: var(--muted);
  margin: 0;
  font-size: 16px;
  font-weight: 400
}

/* Back/Speed buttons inline with player — unify control height with audio */
.back-inline {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: var(--control-h);
  padding: 0 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background-color: var(--surface);
  box-shadow: var(--shadow);
  color: inherit;
  flex: 0 0 auto;
}

.back-inline svg {
  width: 14px;
  height: 14px
}

.back-inline[aria-pressed="true"] {
  background-color: var(--surface);
  color: var(--text);
  border-color: var(--text)
}

/* Compact, icon-only button variant */
.back-inline.icon-only {
  padding: 0 10px
}

.back-inline.icon-only svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6
}

/* Segmented control */
.segmented {
  display: inline-flex;
  gap: 4px;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px;
  margin-top: 14px;
}

.segmented .seg {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  font-size: 12px;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  transition: all .15s ease;
  white-space: nowrap
}

.segmented .seg.active {
  background-color: var(--bg);
  border-color: var(--text);
  box-shadow: var(--shadow);
  font-weight: 600
}

/* tiny segmented for minimal toolbar switches */
.segmented.tiny {
  padding: 2px;
  gap: 2px
}

.segmented.tiny .seg {
  font-size: 11px;
  padding: 6px 8px
}

/* Smaller top tabs for book switch - Apple style */
.segmented.tabs {
  padding: 6px;
  gap: 4px;
  margin-top: 20px;
  display: inline-flex;
  background-color: var(--surface);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.seg-wrap {
  max-width: var(--content-max);
  margin: 0 auto;
  display: flex;
  justify-content: center
}

.segmented.tabs .seg {
  font-size: 13px;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: 8px;
  border: 1px solid transparent;
  transition: all .2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  letter-spacing: 0.3px;
}

.segmented.tabs .seg:hover {
  background: var(--bg);
  transform: scale(1.02);
}

.segmented.tabs .seg.active {
  background: var(--bg);
  color: var(--text);
  border-color: var(--text);
  box-shadow: var(--shadow);
  font-weight: 600;
}

@media (max-width: 768px) {
  .hero {
    padding: 40px 0 20px
  }

  .hero h1 {
    font-size: 42px
  }

  .hero .subtitle {
    font-size: 14px
  }

  .segmented.tabs {
    gap: 2px;
    padding: 4px;
    margin-top: 16px;
  }

  .segmented.tabs .seg {
    font-size: 12px;
    padding: 8px 16px;
  }

  .lessons-grid {
    grid-template-columns: 1fr;
    gap: 6px
  }

  .lesson-item {
    padding: 16px
  }

  .lesson-title {
    font-size: 16px
  }
}

/* Book cards grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  padding: 26px 0 64px
}

.card {
  position: relative;
  border: 1px solid var(--border);
  background-color: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease
}

.card:hover {
  transform: translateY(-4px)
}

.card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  display: block;
  opacity: .9
}

.card .body {
  padding: 14px 14px 16px
}

.card .title {
  font-weight: 700;
  margin: 6px 0 4px
}

.card .sub {
  font-size: 12px;
  color: var(--muted)
}


/* Last seen section - integrated into lessons */
.last-seen-section {
  margin-bottom: 20px;
  padding: 8px 4px;
}

/* Lessons container */
.lessons {
  padding: 10px 0 40px;
  max-width: var(--content-max);
  margin: 0 auto
}

/* Lessons grid - Apple-inspired design */
.lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 8px
}

.lesson-item {
  background-color: var(--surface);
  border-radius: 8px;
  border: 1px solid var(--border);
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: all .2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.lesson-item:hover {
  transform: scale(1.02);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
  border-color: var(--border);
}

.lesson-item:active {
  transform: scale(1.01);
}

.lesson-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  flex: 1;
  min-width: 0;
  height: 100%
}

.lesson-num {
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.lesson-title {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
}

/* Favorite button on lesson item - Apple style */
.fav-btn {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--muted);
  opacity: 0;
  transition: all .2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  cursor: pointer;
  padding: 0;
  margin: 0;
  border: none;
  border-radius: 8px;
}

.lesson-item:hover .fav-btn {
  opacity: 0.5
}

.fav-btn:hover {
  opacity: 1;
  color: var(--text);
  background: var(--surface);
  transform: scale(1.1);
}

.fav-btn.active {
  opacity: 1;
  color: var(--text);
}

.fav-btn.active:hover {
  background: var(--surface);
}

.fav-btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor
}

/* Lesson page */
.toolbar {
  position: sticky;
  top: env(safe-area-inset-top);
  z-index: 20;
  padding: 6px 0;
  background: transparent;
  border-bottom: none;
}

.toolbar,
.bottom-player-bar {
  transition: opacity .22s ease, transform .22s ease
}

.toolbar .topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: calc(10px * var(--lesson-ui-scale, 1));
  max-width: var(--content-max);
  margin: 0 auto;
}

.toolbar .topbar-actions {
  display: flex;
  align-items: center;
  gap: calc(8px * var(--lesson-ui-scale, 1));
}

.toolbar .seg-wrap {
  flex: 1;
  margin: 0;
  max-width: none;
  display: flex;
  justify-content: center;
}

.toolbar #langTabs.segmented.tabs {
  margin-top: 0;
  padding: calc(4px * var(--lesson-ui-scale, 1));
  gap: calc(3px * var(--lesson-ui-scale, 1));
  border-radius: calc(8px * var(--lesson-ui-scale, 1));
}

.toolbar #langTabs.segmented.tabs .seg {
  font-size: calc(12px * var(--lesson-ui-scale, 1));
  padding: calc(8px * var(--lesson-ui-scale, 1)) calc(14px * var(--lesson-ui-scale, 1));
  border-radius: calc(8px * var(--lesson-ui-scale, 1));
}

.toolbar .back-inline {
  height: calc(28px * var(--lesson-ui-scale, 1));
  padding: 0 calc(10px * var(--lesson-ui-scale, 1));
  font-size: calc(12px * var(--lesson-ui-scale, 1));
  gap: calc(6px * var(--lesson-ui-scale, 1));
  border-radius: calc(8px * var(--lesson-ui-scale, 1));
  background: var(--surface);
  box-shadow: var(--shadow);
  border-color: var(--border);
  cursor: pointer;
}

.toolbar .back-inline svg {
  width: calc(14px * var(--lesson-ui-scale, 1));
  height: calc(14px * var(--lesson-ui-scale, 1))
}

.toolbar .back-inline:hover {
  background: color-mix(in srgb, var(--surface) 85%, var(--bg));
}

@media (max-width: 480px) {
  .toolbar {
    padding: 6px 0;
  }

  .toolbar .topbar-inner {
    justify-content: center;
  }

  .toolbar .seg-wrap {
    flex: 0;
  }

  .toolbar #langTabs.segmented.tabs .seg {
    padding: calc(7px * var(--lesson-ui-scale, 1)) calc(12px * var(--lesson-ui-scale, 1));
  }

  .toolbar .back-inline {
    height: calc(26px * var(--lesson-ui-scale, 1));
    padding: 0 calc(9px * var(--lesson-ui-scale, 1));
  }
}

.controls {
  display: flex;
  align-items: center;
  gap: 8px
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: inherit;
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
  box-shadow: var(--shadow)
}

.btn:hover {
  transform: translateY(-1px)
}

.sentences {
  padding: 20px 0 40px;
  max-width: var(--content-max);
  margin: 0 auto
}

.sentence {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin: 12px 0;
  cursor: pointer;
  transition: all .2s ease;
  text-decoration: none;
  color: inherit;
  display: block;
  position: relative;
}

.sentence:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border);
}

.sentence.active {
  border: 2px solid var(--text);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
  padding: 19px;
  /* 减1px以补偿2px边框 */
}

.sentence-fav-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--muted);
  border: none;
  border-radius: 8px;
  box-shadow: none;
  opacity: 0;
  transition: all .2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  cursor: pointer;
  padding: 0;
  margin: 0;
  z-index: 4;
}

.sentence:hover .sentence-fav-btn {
  opacity: 0.5
}

.sentence-fav-btn:hover {
  opacity: 1;
  color: var(--text);
  background: var(--surface);
  transform: scale(1.1);
}

.sentence-fav-btn.active {
  opacity: 1;
  color: var(--text);
}

.sentence-fav-btn.active:hover {
  background: var(--surface)
}

.sentence-fav-btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor
}

/* Favorites page: keep remove button hidden by default */
body.favorites-page .sentence-fav-btn.active {
  opacity: 0
}

body.favorites-page .fav-item.active .sentence-fav-btn,
body.favorites-page .fav-item.active .sentence-fav-btn {
  opacity: 0.9
}

.fav-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 8px;
  opacity: 0;
  transition: opacity .2s ease;
}

.sentence:hover .fav-actions {
  opacity: 1
}

.sentence.active .fav-actions {
  opacity: 1
}

@media (max-width: 640px) {
  body.favorites-page .fav-actions {
    opacity: 1
  }
}

.sentence-jump-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 28px;
  padding: 0 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform .15s ease, color .15s ease, background .15s ease, box-shadow .15s ease;
  font-size: 12px;
}

.sentence-jump-btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor
}

.sentence-jump-btn:hover {
  transform: translateY(-1px);
  color: var(--text);
  box-shadow: var(--shadow-hover)
}

.sentence-ai-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 28px;
  padding: 0 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform .15s ease, color .15s ease, background .15s ease, box-shadow .15s ease;
  font-size: 12px;
  letter-spacing: 0.2px;
}

.sentence-ai-btn:hover {
  transform: translateY(-1px);
  color: var(--text);
  box-shadow: var(--shadow-hover)
}

.fav-meta {
  margin-top: 8px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.35
}

.empty-state {
  max-width: 420px;
  margin: 60px auto;
  padding: 0 20px;
  text-align: center;
  background: transparent;
  border: none;
}

.empty-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
}

.empty-icon svg {
  width: 32px;
  height: 32px;
  color: var(--muted);
  opacity: 0.8;
}

.empty-state h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 12px;
}

.empty-state p {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.6;
  margin: 0 0 32px;
}

.empty-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 28px;
  background: var(--text);
  color: var(--bg);
  font-weight: 600;
  border-radius: 99px;
  text-decoration: none;
  transition: transform 0.2s ease, opacity 0.2s ease;
  box-shadow: var(--shadow);
}

.empty-action-btn:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

.en {
  font-weight: 600;
  font-size: 1.1rem;
  line-height: 1.5;
  color: var(--text)
}

.cn {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 8px;
  line-height: 1.4
}

.lang-en .cn {
  display: none
}

.lang-cn .en {
  display: none
}

/* Listen Mode - Clean minimal design */
.sentence.listen-mode:not(.revealed) {
  position: relative;
  cursor: pointer;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card);
}

.sentence.listen-mode:not(.revealed) .en,
.sentence.listen-mode:not(.revealed) .cn {
  opacity: 0;
  user-select: none;
  -webkit-user-select: none;
  pointer-events: none;
}

/* Cover overlay */
.sentence.listen-mode:not(.revealed)::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--card);
  border-radius: calc(var(--radius) - 1px);
  z-index: 1;
}

/* Reveal button */
.reveal-btn {
  display: none;
  position: absolute;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  z-index: 2;
  opacity: 0;
  transition: all 0.2s ease;
  cursor: pointer;
  pointer-events: none;
}

.sentence.listen-mode:not(.revealed) .reveal-btn {
  display: inline-flex;
}

.sentence.listen-mode:not(.revealed):hover .reveal-btn {
  opacity: 0.7;
  pointer-events: auto;
}

.sentence.listen-mode:not(.revealed):hover .reveal-btn:hover {
  opacity: 1;
  transform: scale(1.02);
  box-shadow: var(--shadow-hover);
}

.reveal-btn .reveal-icon {
  display: inline-block;
}

.reveal-btn .reveal-text {
  display: inline-block;
}

/* Active sentence in listen mode */
.sentence.listen-mode.active:not(.revealed) {
  border: 2px solid var(--text);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
  padding: 19px;
  /* 减1px以补偿2px边框 */
  min-height: 60px;
}

.sentence.listen-mode.active:not(.revealed) .reveal-btn {
  opacity: 0.9;
  border-color: var(--text);
  color: var(--text);
  pointer-events: auto;
}

/* Revealed sentences */
.sentence.listen-mode.revealed {
  cursor: default;
}

.sentence.listen-mode.revealed.active {
  border: 2px solid var(--text);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
  padding: 19px;
  /* 减1px以补偿2px边框 */
}

.sentence.listen-mode.revealed .en,
.sentence.listen-mode.revealed .cn {
  animation: revealText 0.3s ease forwards;
}

@keyframes revealText {
  from {
    opacity: 0;
    transform: translateY(4px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Revealed sentence: hide button in corner */
.sentence.listen-mode.revealed .reveal-btn {
  display: inline-flex;
  position: absolute;
  top: 10px;
  left: 12px;
  padding: 4px 10px;
  font-size: 0.75rem;
  color: var(--muted);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  opacity: 0;
  transition: opacity 0.2s ease;
  cursor: pointer;
  z-index: 3;
  pointer-events: auto;
}

.sentence.listen-mode.revealed .reveal-btn .reveal-icon {
  display: none;
}

.sentence.listen-mode.revealed:hover .reveal-btn {
  opacity: 0.7;
  pointer-events: auto;
}

/* Auto Continue Card */
.auto-continue-card {
  display: inline-flex;
  gap: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px;
  animation: fadeIn 0.2s ease-out;
  height: var(--control-h);
  align-items: center;
}

.auto-continue-option {
  display: flex;
  align-items: center;
  gap: 0;
  border-radius: 8px;
  transition: all 0.15s ease;
}

.auto-continue-option input[type="radio"] {
  appearance: none;
  position: absolute;
  opacity: 0;
}

.auto-continue-option label {
  display: block;
  padding: 6px 10px;
  font-size: 12px;
  color: var(--text);
  cursor: pointer;
  border-radius: 8px;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  margin: 0;
  white-space: nowrap;
}

.auto-continue-option input[type="radio"]:checked+label {
  background: var(--bg);
  color: var(--text);
  border-color: var(--text);
  box-shadow: var(--shadow);
  font-weight: 600;
}

.auto-continue-option:hover label {
  background: var(--bg);
}

.auto-continue-option input[type="radio"]:disabled+label {
  opacity: 0.5;
  cursor: not-allowed;
}

.auto-continue-option input[type="radio"]:disabled+label:hover {
  background: transparent;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translate(-50%, -20px);
  }

  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

@keyframes slideUp {
  from {
    opacity: 1;
    transform: translate(-50%, 0);
  }

  to {
    opacity: 0;
    transform: translate(-50%, -20px);
  }
}

/* Responsive auto continue */
@media (max-width: 768px) {
  .auto-continue-card {
    gap: 2px;
    padding: 3px;
  }

  .auto-continue-option label {
    padding: 5px 8px;
    font-size: 11px;
  }

  /* 播完后在新版设置中使用 select，旧兼容 radios 保持隐藏 */
  #afterPlayCard {
    display: none !important;
  }
}

/* Audio */
.player {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 6px auto 10px;
  padding: 0;
  background: transparent;
  border: none;
  box-shadow: none;
  min-height: var(--control-h);
  max-width: var(--content-max);
  width: 100%;
}

/* Bottom player bar (lesson page) */
.bottom-player-bar {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: calc(10px + env(safe-area-inset-bottom));
  z-index: 650;
  width: min(calc(100vw - 24px), var(--content-max));
  padding: 0;
  background: transparent;
  border: none;
}

/* Auto-hide top/bottom bars (mobile browser) */
body.ui-bars-hidden.lesson-page .toolbar,
body.ui-bars-hidden.favorites-page .toolbar {
  opacity: 0;
  transform: translateY(-14px);
  pointer-events: none;
}

body.ui-bars-hidden.lesson-page .bottom-player-bar,
body.ui-bars-hidden.favorites-page .bottom-player-bar {
  opacity: 0;
  transform: translateX(-50%) translateY(calc(100% + 18px));
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {

  .toolbar,
  .bottom-player-bar {
    transition: none
  }
}

.bottom-player-bar .player {
  margin: 0 auto;
  max-width: none;
  width: 100%;
}

.bottom-player-bar .custom-player {
  width: 100%;
  height: calc((var(--control-h) + 6px) * var(--lesson-ui-scale, 1));
  border-radius: calc(12px * var(--lesson-ui-scale, 1));
  padding: 0 calc(14px * var(--lesson-ui-scale, 1));
  gap: calc(8px * var(--lesson-ui-scale, 1));
  box-shadow: var(--shadow);
  background: var(--surface);
  border-color: var(--border);
}

.bottom-player-bar .custom-player:hover {
  box-shadow: var(--shadow-hover);
}

.bottom-player-bar .play-btn {
  width: calc(24px * var(--lesson-ui-scale, 1));
  height: calc(24px * var(--lesson-ui-scale, 1));
}

.bottom-player-bar .play-btn svg {
  width: calc(18px * var(--lesson-ui-scale, 1));
  height: calc(18px * var(--lesson-ui-scale, 1));
}

.bottom-player-bar .time-display {
  font-size: calc(11px * var(--lesson-ui-scale, 1));
  min-width: calc(32px * var(--lesson-ui-scale, 1));
}

.bottom-player-bar .progress-container {
  padding: 0 calc(4px * var(--lesson-ui-scale, 1));
}

.bottom-player-bar .progress-bar {
  height: calc(4px * var(--lesson-ui-scale, 1));
  border-radius: calc(2px * var(--lesson-ui-scale, 1));
}

.bottom-player-bar .progress-bar:hover {
  height: calc(6px * var(--lesson-ui-scale, 1));
}

@media (max-width: 480px) {
  .bottom-player-bar {
    width: min(calc(100vw - 16px), var(--content-max));
    bottom: calc(8px + env(safe-area-inset-bottom));
  }

  .bottom-player-bar .custom-player {
    height: calc((var(--control-h) + 4px) * var(--lesson-ui-scale, 1));
    border-radius: calc(10px * var(--lesson-ui-scale, 1));
    padding: 0 calc(12px * var(--lesson-ui-scale, 1));
  }
}

/* Reserve space and lift floating UI above bottom bar */
body.lesson-page {
  --lesson-ui-scale: 1.15;
  --lesson-bottom-bar-h: calc(64px * var(--lesson-ui-scale));
}

body.lesson-page .container {
  padding-bottom: calc(var(--lesson-bottom-bar-h) + env(safe-area-inset-bottom));
}

body.lesson-page .pwa-prompt {
  bottom: calc(20px + var(--lesson-bottom-bar-h) + env(safe-area-inset-bottom));
}

/* Favorites page: keep content above bottom bar */
body.favorites-page {
  --lesson-ui-scale: 1.05;
  --lesson-bottom-bar-h: calc(64px * var(--lesson-ui-scale));
}

body.favorites-page .container {
  padding-bottom: calc(var(--lesson-bottom-bar-h) + env(safe-area-inset-bottom));
}

/* Custom Audio Player */
.custom-player {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  height: var(--control-h);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0 12px;
  box-shadow: var(--shadow);
  transition: all .2s ease;
}

.custom-player:hover {
  box-shadow: var(--shadow-hover);
}

.custom-player audio {
  display: none;
}

/* Favorites page: TTS bar layout */
body.favorites-page .tts-player {
  justify-content: center;
  flex-wrap: nowrap;
}

/* Favorites page: shrink bottom bar to content */
body.favorites-page .bottom-player-bar {
  width: auto;
}

body.favorites-page .bottom-player-bar .player {
  width: auto;
  max-width: none;
  justify-content: center;
}

body.favorites-page .bottom-player-bar .custom-player.tts-player {
  flex: 0 0 auto;
  width: fit-content;
  max-width: calc(100vw - 24px);
  height: calc((var(--control-h) + 4px) * var(--lesson-ui-scale, 1));
  padding: 0 12px;
}

/* Play/Pause Button */
.play-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: transparent;
  border: none;
  color: var(--text);
  cursor: pointer;
  padding: 0;
  transition: all .2s ease;
}

.play-btn:hover {
  transform: scale(1.1);
}

.play-btn svg {
  width: 18px;
  height: 18px;
}

/* Time Display */
.time-display {
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  min-width: 32px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

/* Progress Container */
.progress-container {
  flex: 1;
  height: 100%;
  display: flex;
  align-items: center;
  cursor: pointer;
  padding: 0 4px;
}

.progress-bar {
  position: relative;
  width: 100%;
  height: 4px;
  background: color-mix(in srgb, var(--border) 80%, transparent);
  border-radius: 2px;
  overflow: hidden;
}

.progress-filled {
  height: 100%;
  background: var(--text);
  border-radius: 2px;
  transition: width .1s linear;
  min-width: 0;
}

.progress-bar:hover {
  height: 6px;
}

.progress-bar:hover .progress-filled {
  height: 100%;
}

/* Lesson bottom navigation */
.lesson-nav {
  display: flex;
  gap: 10px;
  padding: 6px 0 16px;
  max-width: var(--content-max);
  margin: 0 auto
}

.btn-nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 14px;
  min-width: 96px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: inherit;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .15s ease
}

.btn-nav:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow)
}

/* 让第一个可见按钮靠左，最后一个可见按钮靠右 */
.btn-nav.prev {
  margin-right: auto
}

.btn-nav.next {
  margin-left: auto
}

/* Floating back-to-top button (lesson page) */
.back-to-top {
  position: fixed;
  right: calc(18px + env(safe-area-inset-right));
  bottom: calc(18px + env(safe-area-inset-bottom));
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-hover);
  color: var(--text);
  cursor: pointer;
  z-index: 700;
  opacity: 0;
  transform: translateY(10px) scale(.98);
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease, box-shadow .2s ease, background .2s ease;
  backdrop-filter: saturate(130%) blur(8px);
  -webkit-backdrop-filter: saturate(130%) blur(8px);
}

.back-to-top svg {
  width: 18px;
  height: 18px;
}

.back-to-top.show {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.pwa-prompt.show+.back-to-top {
  bottom: calc(96px + env(safe-area-inset-bottom));
}

body.lesson-page .back-to-top {
  bottom: calc(18px + var(--lesson-bottom-bar-h) + env(safe-area-inset-bottom));
}

body.lesson-page .pwa-prompt.show+.back-to-top {
  bottom: calc(96px + var(--lesson-bottom-bar-h) + env(safe-area-inset-bottom));
}

.back-to-top:hover {
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  transform: translateY(-2px) scale(1.03);
}

.back-to-top:active {
  transform: translateY(0) scale(.97);
}

@media (max-width: 480px) {
  .back-to-top {
    right: calc(12px + env(safe-area-inset-right));
    bottom: calc(12px + env(safe-area-inset-bottom));
    width: 40px;
    height: 40px;
    border-radius: 10px;
  }

  .pwa-prompt.show+.back-to-top {
    bottom: calc(86px + env(safe-area-inset-bottom));
  }

  body.lesson-page .back-to-top {
    bottom: calc(12px + var(--lesson-bottom-bar-h) + env(safe-area-inset-bottom));
  }

  body.lesson-page .pwa-prompt.show+.back-to-top {
    bottom: calc(86px + var(--lesson-bottom-bar-h) + env(safe-area-inset-bottom));
  }

  .back-to-top svg {
    width: 17px;
    height: 17px;
  }
}

/* Footer - Modern Apple style */
footer {
  padding: 32px 0;
  color: var(--muted);
  text-align: center;
  margin-top: 40px;
  border-top: 1px solid var(--border);
}

footer p {
  margin: 6px 0;
  text-align: center;
  font-size: 14px;
  font-weight: 500;
}

.repo {
  margin-bottom: 8px
}

.gh-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  text-decoration: none;
  transition: all .2s ease;
  padding: 8px 12px;
  border-radius: 8px;
}

.gh-link:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--surface) 50%, transparent);
}

.byline a,
.thanks a,
.version a {
  color: var(--muted);
  text-decoration: none;
  transition: color .2s ease;
}

.byline a:hover,
.thanks a:hover,
.version a:hover {
  color: var(--text);
}

.version {
  font-size: 12px;
  margin-top: 8px;
  opacity: 0.7;
}

.version a {
  font-family: -apple-system, BlinkMacSystemFont, "SF Mono", "Monaco", "Cascadia Code", monospace;
  letter-spacing: 0.3px;
}

.footer-actions {
  margin-top: 12px;
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.footer-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
}

.footer-btn:hover {
  transform: translateY(-1px);
}

.footer-btn:active {
  transform: translateY(0);
}

.page-content {
  max-width: 820px;
  margin: 0 auto;
}

.page-card {
  padding: 18px 20px;
}

.page-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-actions {
  margin-top: 16px;
  text-align: center;
}

.page-actions .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

/* Donate Page - Minimalist & Premium */
.donate-container {
  max-width: 680px;
  margin: 0 auto;
  padding-bottom: 60px;
}

.donate-header {
  text-align: center;
  margin-bottom: 40px;
  padding-top: 20px;
}

.donate-header h1 {
  font-size: 2.8rem;
  font-weight: 700;
  margin: 0 0 12px;
  background: linear-gradient(135deg, var(--text) 0%, var(--muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.03em;
}

.donate-header .subtitle {
  font-size: 1.1rem;
  color: var(--muted);
  font-weight: 400;
  letter-spacing: 0.02em;
}

.donate-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 48px;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.donate-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.donate-message {
  text-align: center;
  margin-bottom: 40px;
}

.donate-message p {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--muted);
  margin: 0 0 16px;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

.donate-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 32px auto;
  width: 60%;
}

.donate-qr-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  margin: 32px 0;
}

.qr-frame {
  padding: 16px;
  background: var(--bg);
  border: 1px solid color-mix(in srgb, var(--accent) 20%, var(--border));
  border-radius: 20px;
  box-shadow: 0 12px 32px -8px rgba(59, 130, 246, 0.15);
  display: inline-block;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.3s ease, border-color 0.3s ease;
}

.qr-frame:hover {
  transform: scale(1.03) rotate(-1deg);
  border-color: var(--accent);
  box-shadow: 0 20px 40px -12px rgba(59, 130, 246, 0.25);
}

.donate-hint {
  display: block;
  max-width: 320px;
  margin: 24px auto 0;
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font-weight: 500;
  font-size: 0.85rem;
  line-height: 1.6;
  text-align: center;
  transition: border-color 0.2s;
}

.donate-hint:hover {
  border-color: var(--muted);
}

.donate-highlight {
  color: var(--text);
  font-weight: 600;
}

.donate-scan-msg {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  margin: 0 auto 24px;
}

.qr-frame img {
  display: block;
  width: 200px;
  height: 200px;
  border-radius: 12px;
  mix-blend-mode: multiply;
  /* Better blend in light mode */
}

body.dark-theme .qr-frame img {
  mix-blend-mode: normal;
  opacity: 0.9;
}

.donate-method-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: var(--bg);
  padding: 8px 16px;
  border-radius: 99px;
  border: 1px solid var(--border);
}

.donate-footer-note {
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
  opacity: 0.8;
  margin-top: 24px;
  line-height: 1.6;
}

.donor-list-section {
  margin-top: 50px;
}

.donor-list-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.donate-sort-row {
  display: flex;
  justify-content: center;
  margin: -10px 0 18px;
}

.donor-list-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text);
  margin: 0;
}

.donor-count-badge {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 12px;
  font-weight: 600;
}

.donate-table-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.01);
}

.donate-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.donate-table th {
  text-align: left;
  padding: 16px 24px;
  font-weight: 500;
  color: var(--muted);
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 97%, var(--text));
}

.donate-table td {
  padding: 16px 24px;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  transition: background 0.2s;
}

.donate-table tr:last-child td {
  border-bottom: none;
}

.donate-table tr:hover td {
  background: color-mix(in srgb, var(--bg) 50%, transparent);
}

.donate-amount {
  font-family: "SF Mono", "Monaco", monospace;
  font-weight: 600;
  color: var(--accent);
}

.donate-date {
  color: var(--muted);
  font-size: 0.85rem;
}

.donate-empty {
  text-align: center;
  padding: 40px !important;
  color: var(--muted) !important;
  font-style: italic;
}

/* About Page - Minimalist & Premium */
.about-container {
  max-width: 680px;
  margin: 0 auto;
  padding-bottom: 60px;
}

.about-header {
  text-align: center;
  margin-bottom: 40px;
  padding-top: 20px;
}

.about-header h1 {
  font-size: 2.8rem;
  font-weight: 700;
  margin: 0 0 12px;
  background: linear-gradient(135deg, var(--text) 0%, var(--muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.03em;
}

.about-header .subtitle {
  font-size: 1.1rem;
  color: var(--muted);
  font-weight: 400;
  letter-spacing: 0.02em;
}

.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 48px;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
  margin-bottom: 24px;
}

.about-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.about-section {
  margin-bottom: 32px;
}

.about-section:last-child {
  margin-bottom: 0;
}

.about-heading {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.about-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
  opacity: 0.6;
}

.about-text {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text);
  margin-bottom: 16px;
}

.about-text p {
  margin: 0 0 16px;
}

.about-text p:last-child {
  margin: 0;
}

.legal-block {
  background: color-mix(in srgb, var(--bg) 60%, var(--surface));
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
}

.legal-block strong {
  color: var(--text);
  font-weight: 600;
}

.version-list {
  list-style: none;
  padding: 0;
  margin: 0;
  position: relative;
}

.version-list::before {
  content: '';
  position: absolute;
  top: 8px;
  bottom: 0;
  left: 7px;
  width: 2px;
  background: var(--border);
  border-radius: 2px;
}

.version-item {
  position: relative;
  padding-left: 32px;
  margin-bottom: 24px;
}

.version-item:last-child {
  margin-bottom: 0;
}

.version-dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--surface);
  border: 3px solid var(--accent);
  z-index: 1;
}

.version-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.version-number {
  font-family: "SF Mono", "Monaco", monospace;
  font-weight: 700;
  color: var(--text);
  font-size: 1rem;
}

.version-date {
  font-size: 0.85rem;
  color: var(--muted);
}

.version-desc {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.5;
}

@media (max-width: 600px) {
  .about-card {
    padding: 32px 24px;
  }

  .about-header h1 {
    font-size: 2.2rem;
  }
}

@media (max-width: 600px) {
  .donate-card {
    padding: 32px 24px;
  }

  .donate-header h1 {
    font-size: 2.2rem;
  }

  .qr-frame img {
    width: 160px;
    height: 160px;
  }
}

/* Sections on index (e.g., recents) */
.section {
  padding: 6px 0 8px
}

.section-title {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .02em;
  margin: 4px 2px 8px;
}

/* Last seen card - 融入整体设计 */
.last-seen {
  background: var(--surface);
  border-radius: 8px;
  border: 1px solid var(--border);
  border-left: 4px solid var(--border);
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: all .2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 8px 4px 16px 4px;
}

.last-seen:hover {
  transform: scale(1.02);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
  border-color: var(--border);
  border-left-color: var(--border);
}

.last-seen:active {
  transform: scale(1.01);
}

.last-seen .lesson-content::before {
  content: '继续学习';
  position: absolute;
  top: -6px;
  left: 0;
  font-size: 10px;
  font-weight: 600;
  color: var(--muted);
  background: var(--surface);
  padding: 0 6px;
  border-radius: 4px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* Links */
a {
  color: inherit
}

a {
  text-decoration: none
}

/* GitHub icon link */
.gh-link svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
  opacity: .8;
  vertical-align: middle;
  transition: opacity .2s ease, transform .2s ease
}

.gh-link:hover svg {
  opacity: 1;
  transform: translateY(-1px)
}

/* Smooth theme transitions for surfaces */
body,
.card,
.lesson-item,
.sentence {
  transition: background-color .35s ease, color .35s ease, box-shadow .35s ease, border-color .35s ease;
}

/* Modern Settings Panel - Vercel/Bento Style */
.settings-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 900;
  transition: opacity .3s ease;
}

.modern-settings {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) scale(0.96);
  width: min(92vw, 480px);
  max-height: min(85vh, 720px);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  z-index: 901;
  display: flex;
  flex-direction: column;
  opacity: 0;
  transition: all .3s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
}

.modern-settings.show {
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
}

.settings-overlay.show {
  opacity: 1;
}

/* Header */
.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.settings-header h2 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin: 0;
  letter-spacing: -0.01em;
}

.close-btn {
  width: 32px;
  height: 32px;
  border-radius: 16px;
  background: var(--surface);
  border: none;
  color: var(--muted);
  transition: all 0.2s;
}

.close-btn:hover {
  background: var(--border);
  color: var(--text);
}

/* Content Scroll Area */
.settings-content-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.setting-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.section-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  margin: 0 0 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Bento Cards */
.bento-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  position: relative;
  transition: all 0.2s ease;
}

/* Read Mode Grid - 2x2 */
.read-mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.mode-card {
  cursor: pointer;
  height: 100px;
}

.mode-card input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.card-content {
  height: 100%;
  padding: 14px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.icon-box svg {
  width: 24px;
  height: 24px;
  color: var(--muted);
  transition: color 0.2s;
}

.text-box {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.card-desc {
  font-size: 11px;
  color: var(--muted);
}

.check-mark {
  position: absolute;
  top: 12px;
  right: 12px;
  color: var(--text);
  opacity: 0;
  transform: scale(0.5);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.check-mark svg {
  width: 16px;
  height: 16px;
}

/* Selected State */
.mode-card input:checked+.card-content {
  background: var(--bg);
}

.mode-card:has(input:checked) {
  border-color: var(--text);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.mode-card input:checked+.card-content .icon-box svg {
  color: var(--text);
}

.mode-card input:checked+.card-content .check-mark {
  opacity: 1;
  transform: scale(1);
}

.mode-card:hover {
  transform: translateY(-2px);
  border-color: var(--muted);
}

/* Controls Grid */
.bento-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.control-card {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.full-card {
  width: 100%;
}

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

.label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
}

.value-display {
  font-size: 12px;
  font-family: monospace;
  color: var(--muted);
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* Segmented Control - Speed */
.segmented-control {
  display: flex;
  background: var(--bg);
  border-radius: 8px;
  padding: 2px;
  border: 1px solid var(--border);
}

.seg-btn {
  flex: 1;
  border: none;
  background: transparent;
  padding: 4px 0;
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

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

.seg-btn.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  font-weight: 600;
}

.speed-segments {
  flex-wrap: wrap;
  gap: 2px;
}

.speed-segments .seg-btn {
  flex: 1 1 calc(33.333% - 2px);
  min-width: 0;
  padding: 6px 0;
}

.speed-custom-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.speed-custom-label {
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
}

.speed-custom-field {
  position: relative;
  flex: 1;
}

.speed-custom-input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  padding: 6px 24px 6px 10px;
  font-size: 13px;
  font-weight: 600;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  appearance: textfield;
}

.speed-custom-input:focus {
  outline: none;
  border-color: var(--text);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--text) 12%, transparent);
}

.speed-custom-input::-webkit-outer-spin-button,
.speed-custom-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.speed-custom-unit {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 12px;
  color: var(--muted);
  pointer-events: none;
}

.speed-custom-hint {
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 6px;
}

/* Select */
.select-wrapper {
  position: relative;
  width: 100%;
}

.modern-select {
  width: 100%;
  appearance: none;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
}

.select-arrow {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--muted);
  pointer-events: none;
}

/* Toggles List */
.toggles-list {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
}

.toggle-row.border-top {
  border-top: 1px solid var(--border);
}

.toggle-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toggle-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

.toggle-desc {
  font-size: 12px;
  color: var(--muted);
}

/* iOS Switch */
.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

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

.slider {
  position: absolute;
  inset: 0;
  background-color: var(--border);
  transition: .3s;
  border-radius: 24px;
  cursor: pointer;
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 2px;
  bottom: 2px;
  background-color: white;
  transition: .3s cubic-bezier(0.16, 1, 0.3, 1);
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* Dark mode switch color adjustment */
.dark-theme .slider:before {
  background-color: #f4f4f5;
}

input:checked+.slider {
  background-color: var(--text);
  /* Black/White */
}

.dark-theme input:checked+.slider {
  background-color: #52525b;
}

input:checked+.slider:before {
  transform: translateX(20px);
}

/* Shadow Config Specifics */
.shadow-config-card {
  padding: 0;
}

.config-row {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.config-row.border-top {
  border-top: 1px solid var(--border);
}

.stepper {
  display: flex;
  align-items: center;
  gap: 8px;
}

.stepper-btn {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text);
}

.stepper-btn:hover {
  background: var(--border);
}

.stepper-input {
  width: 32px;
  text-align: center;
  border: none;
  background: transparent;
  color: var(--text);
  font-weight: 600;
  font-size: 14px;
}

.segmented-control.small {
  padding: 2px;
}

.seg-option {
  cursor: pointer;
  position: relative;
}

.seg-option input {
  opacity: 0;
  position: absolute;
  width: 0;
  height: 0;
}

.seg-option span {
  display: block;
  padding: 4px 12px;
  font-size: 12px;
  color: var(--muted);
  border-radius: 6px;
  font-weight: 500;
}

.seg-option input:checked+span {
  background: var(--text);
  color: var(--bg);
}

/* Action Button */
.action-btn {
  width: 100%;
  display: flex;
  align-items: center;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.action-btn:hover {
  background: var(--bg);
  transform: translateY(-1px);
}

.btn-icon {
  width: 18px;
  height: 18px;
  margin-right: 12px;
  color: var(--muted);
}

.arrow-icon {
  width: 16px;
  height: 16px;
  margin-left: auto;
  color: var(--muted);
}

/* Data Management */
.data-mgmt-row {
  width: 100%;
  display: flex;
  align-items: center;
  padding: 14px 16px;
  background: none;
  border: none;
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.data-mgmt-row:hover {
  background: var(--bg);
}

.data-mgmt-row:active {
  background: color-mix(in srgb, var(--bg) 80%, var(--border));
}

.data-mgmt-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  flex: 1;
  min-width: 0;
}

.data-mgmt-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

.data-mgmt-desc {
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
}

.data-mgmt-divider {
  height: 1px;
  background: var(--border);
  margin: 0 16px;
}

/* Import Confirmation Dialog */
.data-confirm-overlay {
  position: fixed;
  inset: 0;
  z-index: 1100;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.2s ease;
}

.data-confirm-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  max-width: 340px;
  width: 100%;
  padding: 24px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.data-confirm-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 8px 0;
}

.data-confirm-body {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 16px 0;
  line-height: 1.5;
}

.data-confirm-summary {
  font-size: 13px;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  margin: 0 0 20px 0;
  line-height: 1.6;
}

.data-confirm-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* Footer */
.settings-footer-modern {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.text-btn {
  background: none;
  border: none;
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
  padding: 8px;
}

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

.primary-btn {
  background: var(--text);
  color: var(--bg);
  border: none;
  padding: 8px 24px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s;
}

.primary-btn:hover {
  transform: scale(1.02);
  opacity: 0.9;
}

@media (max-width: 480px) {
  .read-mode-grid {
    grid-template-columns: 1fr 1fr;
  }

  .bento-grid-2 {
    grid-template-columns: 1fr;
  }
}


/* Make inline controls adapt nicely inside panel */
.settings-panel .back-inline {
  height: 28px;
  padding: 0 10px
}

.settings-panel .auto-continue-card {
  height: auto;
  padding: 6px
}

.settings-panel .auto-continue-option label {
  padding: 6px 10px
}

/* After-Play options: inline segmented control with short labels */
#afterPlayCard {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  gap: 4px;
  height: auto;
  padding: 6px;
  width: auto;
  flex-wrap: wrap;
  /* 极小屏允许换行但保持整齐 */
}

#afterPlayCard .auto-continue-option label {
  display: block;
  white-space: nowrap;
  text-align: center;
  min-height: 0;
  padding: 6px 10px;
  width: auto;
}

/* Hide overflow-prone inline controls on small screens (defensive) */
@media (max-width: 560px) {
  .player .back-inline:not(#backLink):not(#settingsBtn) {
    display: none
  }
}

@media (max-width: 560px) {
  body.favorites-page .player .back-inline {
    display: inline-flex !important
  }
}

/* Shortcuts Help Panel */
.shortcuts-panel {
  max-height: min(90vh, 720px)
}

.shortcuts-group {
  padding: 12px 0;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 50%, transparent)
}

.shortcuts-group:last-child {
  border-bottom: none
}

.shortcuts-group h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 10px 0;
  letter-spacing: 0.3px
}

.shortcut-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  gap: 12px
}

.shortcut-item kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 28px;
  padding: 0 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08), inset 0 -1px 0 rgba(0, 0, 0, 0.1);
  font-family: -apple-system, BlinkMacSystemFont, "SF Mono", "Monaco", "Cascadia Code", monospace;
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 0.3px;
  white-space: nowrap;
}

.shortcut-item span {
  font-size: 13px;
  color: var(--muted);
  flex: 1;
  text-align: right
}

/* Light theme kbd styles - via class or system preference */
.light-theme .shortcut-item kbd {
  background: linear-gradient(180deg, #ffffff 0%, #f5f5f7 100%);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05), inset 0 -1px 0 rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: light) {
  :root:not(.dark-theme) .shortcut-item kbd {
    background: linear-gradient(180deg, #ffffff 0%, #f5f5f7 100%);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05), inset 0 -1px 0 rgba(0, 0, 0, 0.06);
  }
}

/* Dark theme kbd styles - via class or system preference */
.dark-theme .shortcut-item kbd {
  background: linear-gradient(180deg, #27272a 0%, #18181b 100%);
  border-color: #3f3f46;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3), inset 0 -1px 0 rgba(0, 0, 0, 0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not(.light-theme) .shortcut-item kbd {
    background: linear-gradient(180deg, #27272a 0%, #18181b 100%);
    border-color: #3f3f46;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3), inset 0 -1px 0 rgba(0, 0, 0, 0.4);
  }
}

/* Shortcut customization styles */
.shortcuts-tip {
  font-size: 12px;
  color: var(--muted);
  text-align: center;
  margin: 0 0 12px 0;
  padding: 8px 12px;
  background: color-mix(in srgb, var(--surface) 50%, transparent);
  border-radius: 6px;
  border: 1px dashed var(--border);
}

.shortcut-item kbd.editable {
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  position: relative;
}

.shortcut-item kbd.editable:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.12), inset 0 -1px 0 rgba(0, 0, 0, 0.1);
  border-color: var(--text);
}

.shortcut-item kbd.editable:active {
  transform: translateY(0);
}

/* Editing state - waiting for key input */
.shortcut-item kbd.editing {
  animation: pulse-border 1.5s ease-in-out infinite;
  border-color: var(--text);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--text) 20%, transparent);
}

@keyframes pulse-border {

  0%,
  100% {
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--text) 20%, transparent);
  }

  50% {
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--text) 10%, transparent);
  }
}

/* Conflict warning state */
.shortcut-item kbd.conflict {
  border-color: #ef4444;
  animation: shake 0.4s ease-in-out;
}

@keyframes shake {

  0%,
  100% {
    transform: translateX(0);
  }

  25% {
    transform: translateX(-4px);
  }

  75% {
    transform: translateX(4px);
  }
}

/* Custom badge indicator */
.shortcut-item kbd.custom::after {
  content: '•';
  position: absolute;
  top: -4px;
  right: -4px;
  font-size: 14px;
  color: var(--text);
  line-height: 1;
}

/* Non-editable kbd (like "点击按钮") */
.shortcut-item kbd.static {
  opacity: 0.7;
  cursor: default;
}

/* Footer button spacing for 3 buttons */
.shortcuts-panel .settings-footer {
  gap: 8px;
}

.shortcuts-panel .settings-footer .btn {
  flex: 1;
  min-width: 0;
}



/* PWA Install Prompt */
.pwa-prompt {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px 10px 10px;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.06);
  z-index: 800;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

.pwa-prompt.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.pwa-prompt-icon {
  width: 40px;
  height: 40px;
  border-radius: 9px;
  background-color: var(--bg);
  padding: 4px;
  flex-shrink: 0;
}

.pwa-prompt-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  min-width: 0;
}

.pwa-prompt-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
}

.pwa-prompt-sub {
  font-size: 11px;
  color: var(--muted);
  line-height: 1.4;
}

.pwa-prompt-sub .ios-icon {
  display: inline-block;
  width: 16px;
  height: 16px;
  vertical-align: middle;
  margin: 0 2px;
}

.pwa-prompt-btn {
  padding: 6px 12px;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  flex-shrink: 0;
}

.pwa-prompt-btn:hover {
  transform: translateY(-1px);
}

.pwa-prompt-close {
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-family: inherit;
  font-size: 18px;
  line-height: 1;
  width: 28px;
  height: 28px;
  padding: 0;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
  transition: color 0.2s, background-color 0.2s, border-color 0.2s, transform 0.15s ease;
  flex-shrink: 0;
}

.pwa-prompt-close:hover {
  color: var(--text);
  background: var(--bg);
  border-color: var(--border);
}

.pwa-prompt-close:active {
  transform: scale(0.96);
}

@media (max-width: 480px) {
  .pwa-prompt {
    left: 12px;
    right: 12px;
    bottom: 12px;
    gap: 10px;
  }

  .pwa-prompt-content {
    flex: 1;
  }

  .pwa-prompt-btn {
    padding: 6px 10px;
  }

  .pwa-prompt.ios-prompt {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
    padding: 16px;
  }

  .pwa-prompt.ios-prompt .pwa-prompt-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 8px;
  }

  .pwa-prompt.ios-prompt .pwa-prompt-close {
    position: absolute;
    top: 8px;
    right: 8px;
  }
}

/* Resume Play Prompt Overlay */
.resume-play-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  animation: fadeIn 0.2s ease-out;
}

.resume-play-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-hover);
  transform: scale(0.96);
  animation: scaleIn 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  cursor: pointer;
  text-align: center;
  max-width: 85vw;
  min-width: 240px;
}

.resume-play-icon {
  width: 42px;
  height: 42px;
  color: var(--accent);
  margin-bottom: 2px;
  opacity: 0.9;
}

.resume-play-text {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

.resume-play-subtext {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.4;
}

@keyframes scaleIn {
  to {
    transform: scale(1);
  }
}

/* Copyright Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.3s ease-out;
}

.modal-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 32px;
  max-width: 400px;
  width: 100%;
  box-shadow: var(--shadow-hover);
  text-align: center;
  animation: scaleIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-icon {
  width: 48px;
  height: 48px;
  background: var(--bg);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: var(--accent);
  border: 1px solid var(--border);
}

.modal-icon svg {
  width: 24px;
  height: 24px;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 12px;
}

.modal-text {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.6;
  margin: 0 0 24px;
}

.modal-checkbox-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 24px;
  cursor: pointer;
}

.modal-checkbox-wrapper input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--text);
  cursor: pointer;
}

.modal-checkbox-wrapper label {
  font-size: 0.9rem;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}

.modal-btn {
  width: 100%;
  padding: 12px;
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.2s;
}

.modal-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.modal-btn:not(:disabled):hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* --------------------------
   Search UI
   -------------------------- */

/* Header Search Button */
.header-actions {
  position: fixed;
  top: 20px;
  right: calc(20px + max(0px, (100vw - 1240px)) / 2);
  top: calc(env(safe-area-inset-top, 0px) + 20px);
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

@media (max-width: 768px) {
  .header-actions {
    top: 16px;
    right: 16px;
    top: calc(env(safe-area-inset-top, 0px) + 16px);
  }
}

.icon-btn.search-trigger,
.icon-btn.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow);
}

.icon-btn.search-trigger:hover,
.icon-btn.theme-toggle:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-hover);
  background-color: var(--bg);
}

.icon-btn.search-trigger svg,
.icon-btn.theme-toggle svg {
  width: 20px;
  height: 20px;
  opacity: 0.8;
}

/* Search Overlay - Full screen blur */
.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 800;
  background: rgba(255, 255, 255, 0.25);
  /* 25% opacity */
  backdrop-filter: blur(8px) saturate(180%);
  -webkit-backdrop-filter: blur(8px) saturate(180%);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 12vh;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s;
}

body.dark-theme .search-overlay {
  background: rgba(0, 0, 0, 0.4);
  /* Dark transparency */
}

.search-overlay.open {
  opacity: 1;
  visibility: visible;
}

/* Search Container */
.search-container {
  width: 100%;
  max-width: 680px;
  margin: 0 20px;
  background: transparent;
  display: flex;
  flex-direction: column;
  max-height: 75vh;
  opacity: 0;
  transform: translateY(-10px) scale(0.96);
  transition: opacity 0.3s ease, transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.search-overlay.open .search-container {
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* Search Header & Input */
.search-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.search-input-wrapper {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  height: 56px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.search-input-wrapper:focus-within {
  border-color: var(--accent);
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.15);
}

.search-icon {
  width: 22px;
  height: 22px;
  color: var(--muted);
  margin-left: 18px;
  flex: 0 0 auto;
}

#searchInput {
  flex: 1;
  border: none;
  background: transparent;
  height: 100%;
  padding: 0 16px 0 12px;
  font-size: 20px;
  color: var(--text);
  outline: none;
  border-radius: 14px;
}

#searchInput::placeholder {
  color: var(--muted);
  opacity: 0.6;
}

.search-clear {
  appearance: none;
  border: none;
  background: var(--muted);
  color: var(--bg);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  margin-right: 18px;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.2s;
  opacity: 0.5;
}

.search-clear:hover {
  opacity: 1;
}

.search-cancel {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text);
  /* Changed from --accent to --text for better contrast/style */
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  padding: 8px 4px;
  transition: opacity 0.2s;
}

.search-cancel:hover {
  opacity: 0.7;
}

/* Search Results Body */
.search-body {
  position: relative;
  flex: 1;
  overflow-y: auto;
  min-height: 100px;
  /* Mask fade out at bottom */
  -webkit-mask-image: linear-gradient(to bottom, black 90%, transparent 100%);
  mask-image: linear-gradient(to bottom, black 90%, transparent 100%);
  padding-bottom: 40px;
  /* Scrollbar hiding */
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.search-body::-webkit-scrollbar {
  width: 6px;
}

.search-body::-webkit-scrollbar-track {
  background: transparent;
}

.search-body::-webkit-scrollbar-thumb {
  background-color: var(--border);
  border-radius: 3px;
}

/* Result Items */
.search-results {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.search-item {
  display: block;
  text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 16px;
  border-radius: 12px;
  transition: all 0.2s ease;
  cursor: pointer;
}

.search-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border);
  /* Keep border color subtle */
}

.search-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.search-item-tag {
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--bg);
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.search-item-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.search-item-content {
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
}

.search-highlight {
  color: var(--accent);
  font-weight: 600;
  background: rgba(59, 130, 246, 0.1);
  /* Subtle blue highlight bg */
  padding: 0 2px;
  border-radius: 3px;
}

.dark-theme .search-highlight {
  color: #60a5fa;
  background: rgba(96, 165, 250, 0.15);
}

/* Empty State & Loading */
.search-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 0;
  color: var(--muted);
  text-align: center;
}

.search-loading {
  display: flex;
  justify-content: center;
  padding: 40px;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Update Notification Toast */
.update-toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 14px 20px;
  border-radius: 12px;
  /* Consistent squircle radius */
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  z-index: 10000;
  opacity: 0;
  animation: toastSlideUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  max-width: 90vw;
  width: auto;
}

body.dark-theme .update-toast {
  background: var(--surface);
  border-color: var(--border);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.update-toast-text {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
}

.update-toast-btn {
  background: var(--text);
  color: var(--bg);
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  /* Standard radius */
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.2s;
}

.update-toast-btn:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

.update-toast-btn:active {
  transform: scale(0.96);
}

@keyframes toastSlideUp {
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}