@property --c {
  syntax: '<color>';
  inherits: true;
  initial-value: #b7862e;
}

:root {
  --c: #b7862e;
  --bg: #110c0a;
  --ink: #f3e9d8;
  --muted: #b9a992;
  --gold: #e8c46a;
  --line: rgba(255, 240, 215, .1);
  --card: rgba(24, 17, 14, .6);
  transition: --c 1.2s ease;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body { margin: 0; }

body {
  font-family: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1100px 700px at 12% 18%, color-mix(in oklab, var(--c) 38%, transparent), transparent 70%),
    radial-gradient(900px 600px at 95% 100%, color-mix(in oklab, var(--c) 22%, transparent), transparent 70%),
    var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
}

button, input, select { font: inherit; color: inherit; }

/* ---------- Nền: trống đồng ---------- */
.backdrop { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }
.drum {
  --rot: 0deg;
  position: absolute;
  width: min(125vmin, 1150px);
  aspect-ratio: 1;
  right: -28vmin;
  top: 50%;
  color: color-mix(in oklab, var(--c) 45%, var(--gold));
  opacity: .16;
  transform: translateY(-50%) rotate(var(--rot));
  transition: transform 1.6s cubic-bezier(.2, .8, .2, 1);
}
.drum .spin { animation: spin 300s linear infinite; transform-origin: 0 0; }
.drum circle, .drum line, .drum path, .drum polygon, .drum polyline { vector-effect: non-scaling-stroke; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Khung ---------- */
.app {
  position: relative;
  z-index: 1;
  height: 100vh;
  height: 100dvh;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto auto 1fr auto;
}
.app > * { min-width: 0; }

.top {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 18px 40px 10px;
  flex-wrap: wrap;
}
.brand h1 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 28px;
  margin: 0;
  letter-spacing: .5px;
  background: linear-gradient(90deg, var(--gold), #fff3d6);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.brand p { margin: 2px 0 0; font-size: 12.5px; color: var(--muted); }

.search { flex: 1; min-width: 220px; max-width: 520px; }
.search input {
  width: 100%;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .05);
  outline: none;
  transition: border-color .2s, background .2s;
}
.search input:focus { border-color: var(--gold); background: rgba(255, 255, 255, .08); }


/* ---------- Bộ lọc ---------- */
.filters { padding: 4px 40px 6px; }
.chips {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 6px 0 10px;
  scrollbar-width: none;
}
.chips::-webkit-scrollbar { display: none; }
.chip {
  flex: none;
  padding: 6px 13px;
  border-radius: 999px;
  border: 1px solid color-mix(in oklab, var(--ec) 55%, transparent);
  background: color-mix(in oklab, var(--ec) 10%, transparent);
  font-size: 12.5px;
  cursor: pointer;
  transition: background .25s, transform .25s, box-shadow .25s;
}
.chip:hover { transform: translateY(-1px); background: color-mix(in oklab, var(--ec) 25%, transparent); }
.chip.active {
  background: var(--ec);
  color: #fff;
  box-shadow: 0 4px 18px color-mix(in oklab, var(--ec) 50%, transparent);
}


/* ---------- Sân khấu chính ---------- */
.stage {
  display: grid;
  grid-template-columns: minmax(280px, .9fr) 1.1fr;
  gap: 48px;
  align-items: center;
  padding: 16px 40px;
  max-width: 1320px;
  width: 100%;
  margin: 0 auto;
  min-height: 0;
  overflow: auto;
}

.era-name {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: color-mix(in oklab, var(--c) 55%, #fff);
  padding: 5px 12px;
  border: 1px solid color-mix(in oklab, var(--c) 60%, transparent);
  border-radius: 999px;
  background: color-mix(in oklab, var(--c) 15%, transparent);
}
.year {
  font-family: 'Playfair Display', Georgia, serif;
  font-weight: 800;
  font-size: clamp(56px, 8vw, 128px);
  line-height: .95;
  margin: 14px 0 4px;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(180deg, #fff6e0 20%, color-mix(in oklab, var(--c) 70%, var(--gold)));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  white-space: nowrap;
}
.year .suf { font-size: .32em; margin-left: .2em; letter-spacing: 1px; }
.date-label { font-size: 16px; color: #d8c9b2; min-height: 1.4em; }

/* ---------- Ảnh minh họa ---------- */
.bg-img {
  position: absolute; inset: -60px;
  background-size: cover; background-position: center;
  filter: blur(48px) saturate(1.3);
  opacity: .22;
  transition: background-image 1.2s ease, opacity 1.2s ease;
}
.bg-img.off { opacity: 0; }

.pic {
  position: relative;
  margin: 0;
  min-height: clamp(300px, 46vh, 500px);
  display: flex;
  align-items: flex-end;
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 20% 10%, color-mix(in oklab, var(--c) 35%, transparent), transparent 70%),
    rgba(20, 14, 12, .5);
  box-shadow: 0 30px 80px rgba(0, 0, 0, .4);
  isolation: isolate;
}
.pic img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: 0;
  transform: scale(1.12);
  transition: opacity 1s ease, transform 1.4s cubic-bezier(.2, .8, .2, 1);
  z-index: -2;
}
.pic img.contain { object-fit: contain; object-position: center 18%; padding: 14px 14px 30%; }
.pic img.show { opacity: 1; transform: scale(1); animation: kenburns 20s ease-in-out 1.4s infinite alternate; }
.pic img.contain.show { animation: none; }
@keyframes kenburns {
  from { transform: scale(1); }
  to { transform: scale(1.09) translate(-1.5%, -1%); }
}
.pic-shade {
  position: absolute; inset: 0; z-index: -1;
  background:
    linear-gradient(to top, rgba(12, 8, 6, .94) 0%, rgba(12, 8, 6, .6) 38%, rgba(12, 8, 6, .05) 72%),
    linear-gradient(to right, color-mix(in oklab, var(--c) 30%, transparent), transparent 65%);
  transition: opacity .6s;
}
.pic.noimg .pic-shade { opacity: .4; }
.pic-body { position: relative; padding: 26px 30px 24px; width: 100%; }
.credit {
  position: absolute; top: 12px; right: 12px;
  max-width: 72%;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(0, 0, 0, .55);
  color: #d8c9b2;
  font-size: 11px;
  text-decoration: none;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  opacity: .75;
  transition: opacity .2s;
}
.credit:hover { opacity: 1; text-decoration: underline; }

.nav { display: flex; align-items: center; gap: 14px; margin-top: 18px; }
.round {
  width: 46px; height: 46px; border-radius: 50%;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .05);
  font-size: 18px; cursor: pointer;
  transition: background .2s, transform .2s, border-color .2s;
}
.round:hover { background: color-mix(in oklab, var(--c) 30%, transparent); border-color: var(--c); transform: scale(1.06); }
.round:disabled { opacity: .3; pointer-events: none; }
.pos { font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; min-width: 60px; text-align: center; }

.detail {
  position: relative;
  background: var(--card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 30px 34px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .35);
  overflow: hidden;
}
.detail::before {
  content: '';
  position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: linear-gradient(var(--c), color-mix(in oklab, var(--c) 30%, transparent));
}
.detail h2 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1.2;
  margin: 0 0 16px;
  border-radius: 6px;
  transition: background .3s, box-shadow .3s;
}
.text { font-size: 17px; line-height: 1.75; color: #eadfcd; }
.sen { border-radius: 4px; transition: background .3s, box-shadow .3s, color .3s; }
.reading {
  background: color-mix(in oklab, var(--c) 32%, transparent);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--c) 32%, transparent);
  color: #fff;
}
.empty { color: var(--muted); font-size: 16px; }

.actions { display: flex; align-items: center; gap: 12px; margin-top: 24px; flex-wrap: wrap; }
.hint { font-size: 12px; color: var(--muted); margin-left: auto; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 18px; border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .06);
  cursor: pointer; font-size: 14px; font-weight: 500;
  transition: transform .2s, background .2s, box-shadow .2s, border-color .2s;
}
.btn:hover { transform: translateY(-1px); border-color: var(--gold); }
.btn.primary {
  background: var(--gold); color: #1a120d; border-color: transparent; font-weight: 600;
  box-shadow: 0 6px 22px rgba(232, 196, 106, .3);
}
.btn.primary:hover { box-shadow: 0 8px 28px rgba(232, 196, 106, .45); }
.btn { text-decoration: none; }
.badge {
  font-size: 12.5px; padding: 5px 11px; border-radius: 999px;
  background: rgba(255, 60, 60, .14); color: #ffb4a8; border: 1px solid rgba(255, 90, 80, .3);
}
.count { margin-left: auto; font-size: 13px; color: var(--muted); }



/* ---------- Dòng thời gian ---------- */
.timeline {
  position: relative;
  border-top: 1px solid var(--line);
  background: linear-gradient(to top, rgba(0, 0, 0, .55), rgba(0, 0, 0, .15));
}
.timeline::before, .timeline::after {
  content: ''; position: absolute; top: 0; bottom: 0; width: 80px; z-index: 2; pointer-events: none;
}
.timeline::before { left: 0; background: linear-gradient(90deg, var(--bg), transparent); }
.timeline::after { right: 0; background: linear-gradient(-90deg, var(--bg), transparent); }

.track {
  display: flex;
  overflow-x: auto;
  padding: 14px calc(50% - 60px) 16px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, .15) transparent;
}
.era-group { flex: none; display: flex; flex-direction: column; }
.era-label {
  margin: 0 6px;
  padding-top: 6px;
  border-top: 3px solid var(--ec);
  font-size: 11.5px;
  letter-spacing: .5px;
  color: color-mix(in oklab, var(--ec) 60%, #fff);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.marks { display: flex; }
.mark {
  position: relative;
  flex: none;
  width: 120px;
  padding: 12px 8px 4px;
  border: 0;
  background: none;
  text-align: center;
  cursor: pointer;
  animation: pop .5s cubic-bezier(.2, .8, .2, 1) both;
  animation-delay: var(--d, 0s);
}
.mark::before {
  content: ''; position: absolute; left: 0; right: 0; top: 18px; height: 1px;
  background: color-mix(in oklab, var(--ec) 40%, transparent);
}
.mark .dot {
  position: relative;
  display: block;
  width: 12px; height: 12px; margin: 0 auto 10px;
  border-radius: 50%;
  background: var(--ec);
  box-shadow: 0 0 0 3px var(--bg);
  transition: transform .35s cubic-bezier(.2, .8, .2, 1), box-shadow .35s;
}
.mark .y { display: block; font-size: 13px; font-weight: 600; white-space: nowrap; }
.mark .t {
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  font-size: 11.5px; line-height: 1.35; color: var(--muted); margin-top: 3px;
  transition: color .3s;
}
.mark:hover .dot { transform: scale(1.3); }
.mark:hover .t { color: var(--ink); }
.mark.active .dot {
  transform: scale(1.7);
  box-shadow: 0 0 0 3px var(--bg), 0 0 0 6px color-mix(in oklab, var(--ec) 45%, transparent), 0 0 24px var(--ec);
}
.mark.active .y { color: #fff; }
.mark.active .t { color: var(--ink); }
.mark:focus-visible { outline: 2px solid var(--gold); outline-offset: -2px; border-radius: 10px; }

@keyframes pop {
  from { opacity: 0; transform: translateY(14px) scale(.9); }
  to { opacity: 1; transform: none; }
}

/* ---------- Màn hình nhỏ ---------- */
@media (max-width: 860px) {
  .app { height: auto; min-height: 100vh; }
  .top, .filters { padding-left: 16px; padding-right: 16px; }
  .top { gap: 12px; }
  .search { flex-basis: 100%; min-width: 0; max-width: none; }
  .stage { grid-template-columns: 1fr; gap: 20px; padding: 16px; overflow: visible; }
  .year { margin: 12px 0 4px; }
  .pic { min-height: 300px; border-radius: 18px; }
  .pic-body { padding: 20px; }
  .nav { margin-top: 14px; }
  .detail { padding: 22px 20px; }
  .text { font-size: 16px; }
  .hint { display: none; }
  .count { display: none; }
  .timeline { position: sticky; bottom: 0; z-index: 3; background: rgba(17, 12, 10, .92); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}