:root {
  color-scheme: light;
  --bg-a: #f8f0e7;
  --bg-b: #dff2ef;
  --panel: rgba(255, 250, 242, 0.9);
  --sheet: #fffaf2;
  --ink: #17313c;
  --muted: #68716d;
  --line: rgba(23, 49, 60, 0.14);
  --accent: #e05d4e;
  --accent-2: #0b8892;
  --gold: #f4ba49;
  --leaf: #5c946e;
  --shadow: 0 18px 48px rgba(23, 49, 60, 0.16);
  --story-size: 24px;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  overflow-x: hidden;
  background:
    radial-gradient(circle at 12% 8%, rgba(244, 186, 73, 0.28), transparent 24rem),
    radial-gradient(circle at 92% 18%, rgba(11, 136, 146, 0.18), transparent 28rem),
    linear-gradient(135deg, var(--bg-a), var(--bg-b));
  color: var(--ink);
  font-family: ui-rounded, "SF Pro Rounded", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

body.night {
  color-scheme: dark;
  --bg-a: #0c2733;
  --bg-b: #231c34;
  --panel: rgba(20, 58, 72, 0.88);
  --sheet: #143a48;
  --ink: #fff4e4;
  --muted: #bdd0cc;
  --line: rgba(255, 244, 228, 0.16);
  --accent: #ff8a73;
  --accent-2: #55d2d1;
  --gold: #ffd36d;
  --leaf: #83c994;
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.28);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.app-shell {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  min-height: 100vh;
  padding:
    max(14px, env(safe-area-inset-top))
    max(14px, env(safe-area-inset-right))
    max(14px, env(safe-area-inset-bottom))
    max(14px, env(safe-area-inset-left));
  gap: 12px;
}

.app-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: min(1180px, 100%);
  margin: 0 auto;
}

.book-title {
  display: grid;
  gap: 2px;
}

.book-title span,
.eyebrow {
  color: var(--accent-2);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
}

.book-title strong {
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.05;
}

.top-actions {
  display: flex;
  gap: 8px;
}

.icon-button,
.round-control {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--ink);
  font-weight: 900;
  box-shadow: 0 8px 18px rgba(23, 49, 60, 0.08);
}

.book-screen {
  display: grid;
  grid-template-rows: minmax(320px, 58vh) auto;
  gap: 12px;
  width: min(860px, 100%);
  min-height: 0;
  margin: 0 auto;
}

.page-art-panel,
.page-copy-panel,
.player-dock {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.page-art-panel {
  position: relative;
  overflow: hidden;
  min-height: 0;
}

.page-art-panel img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
}

.page-chip {
  position: absolute;
  left: 16px;
  top: 16px;
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
  min-height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.52);
  border-radius: 999px;
  padding: 6px 14px;
  background: rgba(16, 44, 59, 0.62);
  color: #ffffff;
  font-weight: 900;
  backdrop-filter: blur(14px);
}

.page-copy-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  min-height: 0;
  padding: clamp(18px, 3vw, 28px);
}

.eyebrow {
  margin: 0 0 6px;
}

h1,
h2,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.08;
}

.toggle-control {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  border: 1px solid color-mix(in srgb, var(--accent-2) 54%, transparent);
  border-radius: 999px;
  padding: 0 12px;
  color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 8%, transparent);
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
}

.progress-rail {
  height: 8px;
  margin: 0 0 18px;
  overflow: hidden;
  border-radius: 999px;
  background: color-mix(in srgb, var(--ink) 12%, transparent);
}

.progress-rail span {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--gold), var(--accent-2));
  transition: width 220ms ease;
}

.story-text {
  min-height: 0;
  overflow: auto;
  padding-right: 4px;
  text-align: left;
}

.story-line {
  margin: 0 0 0.9em;
  font-size: var(--story-size);
  line-height: 1.72;
}

.story-line.active {
  background: color-mix(in srgb, var(--gold) 38%, transparent);
  border-radius: 10px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
  padding: 0.06em 0.22em;
}

.chapter-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding-top: 10px;
}

.chapter-dot {
  width: 13px;
  height: 13px;
  border: 0;
  border-radius: 999px;
  background: color-mix(in srgb, var(--ink) 22%, transparent);
}

.chapter-dot.active {
  width: 32px;
  background: var(--accent-2);
}

.player-dock {
  display: grid;
  grid-template-columns: 52px 72px 52px minmax(160px, 1fr) auto;
  align-items: center;
  gap: 12px;
  width: min(820px, 100%);
  margin: 0 auto;
  padding: 12px;
  background: color-mix(in srgb, var(--panel) 94%, transparent);
  backdrop-filter: blur(18px);
}

.play-control {
  display: grid;
  place-items: center;
  width: 72px;
  height: 72px;
  border: 0;
  border-radius: 50%;
  background: var(--accent);
  color: #ffffff;
  font-size: 28px;
  box-shadow: 0 12px 26px color-mix(in srgb, var(--accent) 36%, transparent);
}

.speed-control {
  display: grid;
  grid-template-columns: auto minmax(90px, 1fr);
  align-items: center;
  gap: 10px;
  min-height: 46px;
  color: var(--muted);
  font-weight: 900;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent-2);
}

.toggle-control {
  border-color: var(--line);
  color: var(--muted);
  background: transparent;
}

.toggle-control.active {
  border-color: transparent;
  color: #ffffff;
  background: var(--accent-2);
}

@media (max-width: 980px) {
  .book-screen {
    grid-template-rows: auto auto;
  }

  .page-art-panel img {
    aspect-ratio: 16 / 10;
    min-height: 0;
  }

}

@media (max-width: 640px) {
  .app-shell {
    padding: 10px 10px max(10px, env(safe-area-inset-bottom));
  }

  .app-topbar {
    align-items: flex-start;
  }

  .book-title strong {
    font-size: 24px;
  }

  .icon-button {
    width: 42px;
    height: 42px;
  }

  .page-art-panel,
  .page-copy-panel,
  .player-dock {
    border-radius: 18px;
  }

  .page-copy-panel {
    min-height: 0;
  }

  .story-line {
    line-height: 1.64;
  }

  .player-dock {
    position: sticky;
    bottom: max(10px, env(safe-area-inset-bottom));
    grid-template-columns: 46px 64px 46px minmax(0, 1fr);
    gap: 8px;
  }

  .round-control {
    width: 46px;
    height: 46px;
  }

  .play-control {
    width: 64px;
    height: 64px;
  }

  .speed-control,
  .toggle-control {
    grid-column: 1 / -1;
  }
}