:root {
  --bg: #f1ead8;
  --bg-deep: #d4c2a2;
  --panel: rgba(255, 250, 240, 0.82);
  --panel-strong: rgba(253, 247, 235, 0.96);
  --line: rgba(112, 88, 46, 0.16);
  --text: #3d2f1f;
  --muted: #77644d;
  --brand: #6a8b4d;
  --brand-deep: #4e6a35;
  --accent: #b88645;
  --danger: #9d4d36;
  --shadow: 0 28px 60px rgba(84, 63, 31, 0.16);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --font-display: "Noto Serif TC", "Songti TC", "Hiragino Mincho ProN",
    "PMingLiU", serif;
  --font-ui: "Iansui", "PingFang TC", "Microsoft JhengHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font-ui);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.72), transparent 32%),
    radial-gradient(circle at top right, rgba(202, 174, 103, 0.22), transparent 24%),
    linear-gradient(180deg, #efe7d2 0%, #e7dac0 30%, #f3ecdf 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.12), transparent 40%),
    repeating-linear-gradient(
      90deg,
      rgba(120, 90, 44, 0.02) 0,
      rgba(120, 90, 44, 0.02) 1px,
      transparent 1px,
      transparent 28px
    );
}

.page-shell {
  width: min(1380px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 28px 0 40px;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 32px;
  border: 1px solid rgba(118, 92, 47, 0.12);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(135deg, rgba(254, 248, 238, 0.98), rgba(242, 233, 214, 0.88)),
    linear-gradient(160deg, rgba(112, 146, 80, 0.08), transparent 48%);
  box-shadow: var(--shadow);
}

.hero::after {
  content: "";
  position: absolute;
  width: 320px;
  height: 320px;
  right: -72px;
  top: -92px;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(184, 134, 69, 0.22) 0, rgba(184, 134, 69, 0.06) 55%, transparent 72%);
  filter: blur(2px);
}

.eyebrow,
.panel-kicker {
  margin: 0 0 8px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 12px;
  font-weight: 700;
}

#site-title,
.hero h1,
.panel h2,
.notes h3 {
  font-family: var(--font-display);
}

.hero h1 {
  margin: 0;
  font-size: clamp(42px, 8vw, 72px);
  line-height: 0.98;
  font-weight: 700;
}

.hero-copy {
  max-width: 56ch;
  margin: 16px 0 0;
  font-size: 18px;
  line-height: 1.7;
  color: var(--muted);
}

.hero-actions {
  display: none;
  gap: 10px;
  margin-top: 20px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.meta-pill {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px solid rgba(118, 92, 47, 0.14);
  background: rgba(255, 255, 255, 0.56);
  backdrop-filter: blur(16px);
}

.meta-label {
  color: var(--muted);
  font-size: 13px;
}

.layout {
  display: grid;
  grid-template-columns: 1.15fr 1fr 0.72fr;
  gap: 18px;
  margin-top: 20px;
}

.panel {
  min-width: 0;
  padding: 24px;
  border: 1px solid rgba(118, 92, 47, 0.12);
  border-radius: var(--radius-xl);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.panel-head {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 18px;
}

.panel-head-tight {
  margin-bottom: 14px;
}

.panel h2 {
  margin: 0;
  font-size: 28px;
}

.session-banner,
.player-card,
.lyrics-frame,
.notes {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel-strong);
}

.session-banner {
  padding: 16px 18px;
  margin-bottom: 16px;
}

.session-banner p {
  margin: 0;
  line-height: 1.6;
}

.session-banner p + p {
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
}

.player-card {
  padding: 18px;
}

.player-controls,
.toggle-row,
.time-row {
  display: flex;
  align-items: center;
}

.player-controls {
  flex-wrap: wrap;
  gap: 10px;
}

.button {
  appearance: none;
  border: 1px solid rgba(95, 73, 37, 0.16);
  border-radius: 999px;
  background: #fffaf1;
  color: var(--text);
  cursor: pointer;
  font: inherit;
  padding: 11px 18px;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease,
    color 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
  border-color: rgba(95, 73, 37, 0.28);
}

.button-primary {
  border-color: rgba(69, 101, 42, 0.2);
  background: linear-gradient(180deg, #6f8f53 0%, #58753f 100%);
  color: #fdf9f0;
}

.button-ghost {
  background: transparent;
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

.range-wrap {
  display: grid;
  gap: 8px;
  margin-top: 18px;
}

.range-wrap span,
.name-form span {
  font-size: 14px;
  color: var(--muted);
}

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

.time-row {
  justify-content: space-between;
  margin-top: 10px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.name-form {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.identity-card {
  display: grid;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 253, 247, 0.92);
}

.identity-copy {
  display: grid;
  gap: 6px;
}

.identity-copy strong {
  font-size: 18px;
}

.identity-copy p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.identity-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.checkbox {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  margin-top: 16px;
  color: var(--muted);
  line-height: 1.5;
}

.helper-text {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.sidebar-header {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 18px;
}

.sidebar-close {
  display: none;
}

.side-section + .side-section {
  margin-top: 18px;
}

.version-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.version-item button {
  width: 100%;
  display: grid;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-strong);
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.version-item button:hover {
  border-color: rgba(95, 73, 37, 0.24);
  transform: translateY(-1px);
}

.version-item.is-current button {
  border-color: rgba(111, 143, 83, 0.26);
  background:
    linear-gradient(135deg, rgba(111, 143, 83, 0.12), rgba(184, 134, 69, 0.12)),
    #fffcf5;
}

.version-item.is-coming button {
  opacity: 0.86;
}

.version-title-row {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
}

.version-title {
  font-weight: 700;
}

.version-copy {
  color: var(--muted);
  line-height: 1.55;
  font-size: 14px;
}

.version-pill {
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(111, 143, 83, 0.12);
  color: var(--brand-deep);
  font-size: 12px;
  font-weight: 700;
}

.version-empty {
  padding: 14px 16px;
  border: 1px dashed var(--line);
  border-radius: 16px;
  color: var(--muted);
  background: rgba(255, 253, 247, 0.75);
}

.toast-stack {
  position: fixed;
  right: 18px;
  bottom: 20px;
  z-index: 45;
  display: grid;
  gap: 10px;
  pointer-events: none;
}

.toast {
  min-width: min(360px, calc(100vw - 32px));
  max-width: min(420px, calc(100vw - 32px));
  padding: 14px 16px;
  border: 1px solid rgba(118, 92, 47, 0.14);
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(255, 250, 241, 0.97), rgba(248, 240, 224, 0.94));
  box-shadow: 0 22px 48px rgba(55, 39, 16, 0.18);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 220ms ease, transform 220ms ease;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.toast-title {
  display: block;
  font-weight: 700;
}

.toast-copy {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  line-height: 1.55;
}

.modal-shell {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 20px;
}

.modal-shell[hidden] {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(48, 34, 18, 0.44);
  backdrop-filter: blur(10px);
}

.modal-card {
  position: relative;
  width: min(100%, 520px);
  padding: 24px;
  border: 1px solid rgba(118, 92, 47, 0.14);
  border-radius: 26px;
  background:
    linear-gradient(180deg, rgba(255, 250, 241, 0.98), rgba(248, 240, 224, 0.96));
  box-shadow: 0 36px 80px rgba(55, 39, 16, 0.28);
}

.modal-head {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  justify-content: space-between;
}

.modal-head h2 {
  margin: 0;
  font-size: 28px;
}

.modal-field {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.modal-field span {
  font-size: 14px;
  color: var(--muted);
}

.modal-field input {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid rgba(103, 82, 49, 0.16);
  border-radius: 16px;
  background: #fffdf7;
  font: inherit;
  color: var(--text);
}

.checkbox-stack {
  margin-top: 18px;
  align-items: flex-start;
}

.modal-helper {
  margin-top: 12px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 18px;
}

#practice-audio {
  display: none;
}

.lyrics-tip {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.lyrics-frame {
  height: min(72vh, 880px);
  overflow: auto;
  padding: 14px;
  scroll-behavior: smooth;
}

.lyrics-list {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.lyrics-line,
.lyrics-empty {
  position: relative;
  padding: 14px 16px;
  border: 1px solid transparent;
  border-radius: 16px;
  line-height: 1.75;
  cursor: pointer;
  transition:
    transform 160ms ease,
    background 160ms ease,
    border-color 160ms ease,
    color 160ms ease;
}

.lyrics-line:hover {
  transform: translateX(3px);
  background: rgba(122, 154, 92, 0.08);
  border-color: rgba(122, 154, 92, 0.16);
}

.lyrics-line.is-active {
  background:
    linear-gradient(135deg, rgba(111, 143, 83, 0.14), rgba(184, 134, 69, 0.14)),
    #fffcf5;
  border-color: rgba(111, 143, 83, 0.24);
  color: #2f271d;
}

.lyrics-line.is-active::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 12px;
  bottom: 12px;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--brand), var(--accent));
}

.lyrics-time {
  display: block;
  margin-bottom: 6px;
  color: var(--accent);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
}

.count-badge {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(111, 143, 83, 0.12);
  color: var(--brand-deep);
  font-weight: 700;
}

.attendee-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.attendee-list li {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel-strong);
  line-height: 1.55;
}

.attendee-name {
  display: block;
  font-weight: 700;
}

.attendee-meta,
.attendee-empty {
  color: var(--muted);
  font-size: 14px;
}

.notes {
  margin-top: 18px;
  padding: 18px;
}

.notes h3 {
  margin: 0 0 12px;
  font-size: 20px;
}

.notes ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.75;
}

.is-warning {
  color: var(--danger);
}

.sidebar-backdrop {
  display: none;
}

@media (max-width: 1100px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .lyrics-frame {
    height: 60vh;
  }

  .mobile-only {
    display: flex;
  }

  .panel-side {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 44;
    width: min(420px, calc(100vw - 18px));
    overflow-y: auto;
    border-radius: 28px 0 0 28px;
    transform: translateX(108%);
    transition: transform 240ms ease;
  }

  body.sidebar-open {
    overflow: hidden;
  }

  body.sidebar-open .panel-side {
    transform: translateX(0);
  }

  .sidebar-backdrop {
    position: fixed;
    inset: 0;
    z-index: 43;
    border: 0;
    background: rgba(44, 31, 17, 0.38);
    backdrop-filter: blur(6px);
  }

  body.sidebar-open .sidebar-backdrop {
    display: block;
  }

  .sidebar-close {
    display: inline-flex;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100vw - 20px, 100%);
    padding-top: 14px;
  }

  .hero,
  .panel {
    padding: 20px;
    border-radius: 22px;
  }

  .hero h1 {
    font-size: 40px;
  }

  .panel-head,
  .sidebar-header,
  .hero-meta,
  .hero-actions,
  .player-controls,
  .identity-actions,
  .modal-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .button,
  .modal-field input {
    width: 100%;
  }

  .modal-shell {
    padding: 12px;
    align-items: end;
  }

  .panel-side {
    width: min(100vw - 10px, 100%);
    border-radius: 24px 0 0 24px;
  }

  .toast-stack {
    right: 12px;
    left: 12px;
    bottom: 12px;
  }

  .toast {
    min-width: 0;
    max-width: none;
  }

  .modal-card {
    width: 100%;
    border-radius: 24px 24px 0 0;
    padding: 20px;
  }
}