/* ============================================================================
   LD Institute of Indology — manuscript browser
   Theming via CSS variables. Four themes: light / dark / sepia / saffron.
   Accent colour is independent and layered on top.
   ============================================================================ */

:root {
  --radius: 14px;
  --radius-sm: 8px;
  --shadow-card: 0 1px 2px rgba(0, 0, 0, .06), 0 10px 30px -12px rgba(0, 0, 0, .2);
  --shadow-soft: 0 1px 2px rgba(0, 0, 0, .05);
  --font-serif: "Noto Serif Devanagari", "Noto Serif", Georgia, serif;
  --font-sans: "Noto Sans Devanagari", "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-tiro: "Tiro Devanagari Hindi", "Noto Serif Devanagari", Georgia, serif;
  --font-ui: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --nav-h: 64px;
  --transition: 200ms cubic-bezier(.2,.6,.2,1);
}

/* ---------- themes ---------- */
:root, [data-theme="light"] {
  --bg: #faf8f3;
  --bg-elev: #ffffff;
  --bg-soft: #f3efe6;
  --bg-muted: #ecdfc8;
  --fg: #1f1a14;
  --fg-soft: #574d3f;
  --fg-dim: #8a8072;
  --border: #e6ddc8;
  --border-strong: #d8ccb0;
  --accent: #b0541c;
  --accent-weak: rgba(176, 84, 28, .12);
  --accent-fg: #ffffff;
  --paper-url: none;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #0f1115;
  --bg-elev: #171a21;
  --bg-soft: #1d2029;
  --bg-muted: #262a34;
  --fg: #eee9df;
  --fg-soft: #b9b3a6;
  --fg-dim: #7a7467;
  --border: #2a2e39;
  --border-strong: #3a3f4c;
  --accent: #f4a764;
  --accent-weak: rgba(244, 167, 100, .14);
  --accent-fg: #1a1208;
  --paper-url: none;
  color-scheme: dark;
}

[data-theme="sepia"] {
  --bg: #efe3cc;
  --bg-elev: #f7ecd5;
  --bg-soft: #e7d7b8;
  --bg-muted: #dcc9a2;
  --fg: #3b2f1e;
  --fg-soft: #6a5a3f;
  --fg-dim: #988866;
  --border: #d7c39b;
  --border-strong: #c3ac7d;
  --accent: #9d4b16;
  --accent-weak: rgba(157, 75, 22, .15);
  --accent-fg: #ffffff;
  --paper-url: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .25 0 0 0 0 .18 0 0 0 0 .08 0 0 0 .04 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  color-scheme: light;
}

[data-theme="saffron"] {
  --bg: #1a0e0a;
  --bg-elev: #26140d;
  --bg-soft: #2f1810;
  --bg-muted: #3a1f14;
  --fg: #fef4e0;
  --fg-soft: #e8c9a0;
  --fg-dim: #a7896a;
  --border: #402218;
  --border-strong: #5a2f20;
  --accent: #ff9a3c;
  --accent-weak: rgba(255, 154, 60, .14);
  --accent-fg: #1a0e0a;
  --paper-url: none;
  color-scheme: dark;
}

/* accent overrides */
[data-accent="indigo"] { --accent: #7c5cff; --accent-weak: rgba(124,92,255,.15); --accent-fg: #fff; }
[data-accent="emerald"] { --accent: #2f9d69; --accent-weak: rgba(47,157,105,.15); --accent-fg: #fff; }
[data-accent="crimson"] { --accent: #c0374a; --accent-weak: rgba(192,55,74,.15); --accent-fg: #fff; }

/* font family */
[data-font="sans"] { --font-body: var(--font-sans); --font-display: var(--font-sans); }
[data-font="serif"] { --font-body: var(--font-sans); --font-display: var(--font-serif); }
[data-font="tiro"] { --font-body: var(--font-sans); --font-display: var(--font-tiro); }

/* font size */
[data-size="s"] { font-size: 14px; }
[data-size="m"] { font-size: 16px; }
[data-size="l"] { font-size: 18px; }

/* density */
[data-density="compact"] { --row-pad-y: 6px; --row-pad-x: 10px; --gap: 8px; }
[data-density="cozy"]    { --row-pad-y: 10px; --row-pad-x: 14px; --gap: 12px; }
[data-density="spacious"]{ --row-pad-y: 16px; --row-pad-x: 18px; --gap: 18px; }

/* ---------- base ---------- */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  line-height: 1.55;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
}
body::before {
  content: "";
  position: fixed; inset: 0;
  background-image: var(--paper-url);
  background-size: 240px;
  opacity: .35;
  pointer-events: none;
  z-index: 0;
}
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 4vw, 3rem); margin: 0 0 .4em; }
h2 { font-size: 1.5rem; margin: 0 0 .6em; }
h3 { font-size: 1.15rem; margin: 0 0 .4em; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
hr { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }
small { color: var(--fg-dim); }

/* ---------- layout shell ---------- */
.shell { position: relative; z-index: 1; }
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
main { padding: 32px 0 80px; }
.page-header { margin-bottom: 28px; }
.page-header .eyebrow { color: var(--accent); font-weight: 600; letter-spacing: .12em; text-transform: uppercase; font-size: .78rem; }
.muted { color: var(--fg-dim); }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 30;
  height: var(--nav-h);
  display: flex; align-items: center; gap: 24px;
  padding: 0 20px;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid var(--border);
}
.nav .brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-family: var(--font-display); letter-spacing: .02em; }
.nav .brand .logo {
  width: 32px; height: 32px; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 55%, #000));
  color: var(--accent-fg);
  display: grid; place-items: center; font-weight: 700;
  box-shadow: 0 6px 14px -6px var(--accent);
}
.nav .links { display: flex; gap: 4px; align-items: center; flex: 1; flex-wrap: wrap; }
.nav .links a {
  color: var(--fg-soft);
  padding: 8px 12px; border-radius: 10px;
  font-size: .94rem;
  transition: background var(--transition), color var(--transition);
}
.nav .links a:hover { background: var(--bg-soft); color: var(--fg); text-decoration: none; }
.nav .links a.active { color: var(--fg); background: var(--accent-weak); }
.nav .actions { display: flex; gap: 6px; align-items: center; }

.icon-btn {
  appearance: none; border: 1px solid var(--border);
  background: var(--bg-elev); color: var(--fg);
  width: 38px; height: 38px; border-radius: 10px;
  display: grid; place-items: center;
  cursor: pointer;
  transition: all var(--transition);
}
.icon-btn:hover { border-color: var(--border-strong); background: var(--bg-soft); }
.icon-btn svg { width: 18px; height: 18px; }

/* settings panel */
.settings-panel {
  position: fixed; top: 72px; right: 16px; z-index: 40;
  width: 320px; max-width: calc(100vw - 32px);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 18px;
  transform: translateY(-12px); opacity: 0; pointer-events: none;
  transition: all var(--transition);
}
.settings-panel.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
.settings-panel h4 { margin: 0 0 .4em; font-size: .84rem; text-transform: uppercase; letter-spacing: .1em; color: var(--fg-dim); }
.settings-panel .group + .group { margin-top: 16px; }
.pillbar {
  display: flex; gap: 4px; padding: 4px;
  background: var(--bg-soft); border-radius: 10px; border: 1px solid var(--border);
}
.pillbar button {
  appearance: none; border: 0; background: transparent; color: var(--fg-soft);
  flex: 1; padding: 7px 6px; border-radius: 7px;
  font-family: inherit; font-size: .82rem; cursor: pointer;
  transition: all var(--transition);
}
.pillbar button:hover { color: var(--fg); }
.pillbar button.on { background: var(--bg-elev); color: var(--fg); box-shadow: var(--shadow-soft); }
.swatches { display: flex; gap: 8px; }
.swatches button {
  width: 26px; height: 26px; border-radius: 50%;
  border: 2px solid transparent; cursor: pointer;
  outline: 1px solid var(--border);
  transition: transform var(--transition);
}
.swatches button:hover { transform: scale(1.1); }
.swatches button.on { border-color: var(--fg); outline-color: var(--fg); }

/* ---------- cards ---------- */
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.card.clickable { cursor: pointer; }
.card.clickable:hover { transform: translateY(-2px); border-color: var(--border-strong); box-shadow: var(--shadow-card); }
.card h3 { margin-bottom: .4em; }

/* ---------- hero & stat tiles ---------- */
.hero {
  position: relative;
  border-radius: calc(var(--radius) * 1.3);
  padding: 48px 40px 44px;
  background:
    radial-gradient(ellipse at top right, var(--accent-weak), transparent 60%),
    linear-gradient(180deg, color-mix(in srgb, var(--bg-elev) 88%, var(--accent) 12%), var(--bg-elev));
  border: 1px solid var(--border);
  overflow: hidden;
}
.hero .eyebrow { color: var(--accent); font-weight: 600; letter-spacing: .14em; text-transform: uppercase; font-size: .78rem; margin-bottom: 12px; }
.hero h1 { font-family: var(--font-display); margin-bottom: .2em; }
.hero p.lead { font-size: 1.1rem; color: var(--fg-soft); max-width: 68ch; margin: 0 0 28px; }
.hero::after {
  content: "";
  position: absolute; right: -60px; bottom: -60px;
  width: 280px; height: 280px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--accent-weak), transparent 70%);
  pointer-events: none;
}

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-top: 24px; }
.stat {
  background: color-mix(in srgb, var(--bg-elev) 80%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  position: relative;
}
.stat .label { font-size: .78rem; color: var(--fg-dim); text-transform: uppercase; letter-spacing: .08em; }
.stat .value { font-family: var(--font-display); font-size: clamp(1.8rem, 3vw, 2.4rem); font-weight: 700; color: var(--fg); }
.stat .sub { font-size: .85rem; color: var(--fg-soft); margin-top: 2px; }

/* ---------- section grid ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-auto-260 { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.grid-auto-320 { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; }
@media (max-width: 900px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* ---------- chips & badges ---------- */
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: 999px;
  background: var(--bg-soft); color: var(--fg-soft);
  border: 1px solid var(--border);
  font-size: .82rem;
  transition: all var(--transition);
}
a.chip:hover { background: var(--accent-weak); color: var(--fg); border-color: var(--accent); text-decoration: none; }
.chip .count { color: var(--fg-dim); font-variant-numeric: tabular-nums; }
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px; border-radius: 999px;
  background: var(--accent-weak); color: var(--accent);
  font-size: .75rem; font-weight: 600;
}

/* ---------- browse / table ---------- */
.browse-layout { display: grid; grid-template-columns: 280px 1fr; gap: 24px; align-items: flex-start; }
@media (max-width: 1000px) { .browse-layout { grid-template-columns: 1fr; } }
.filters { position: sticky; top: calc(var(--nav-h) + 16px); }
.filters .group + .group { margin-top: 18px; }
.filters label.block { display: block; font-size: .8rem; text-transform: uppercase; letter-spacing: .1em; color: var(--fg-dim); margin-bottom: 6px; }
.filters .checkline { display: flex; align-items: center; gap: 8px; font-size: .92rem; }
.filters .range { display: flex; gap: 8px; align-items: center; }
.filters .range input { width: 100%; }

input[type="text"], input[type="search"], input[type="number"], select, textarea {
  width: 100%;
  font: inherit;
  padding: 9px 12px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--fg);
  transition: all var(--transition);
}
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-weak);
}
.search-bar { position: relative; }
.search-bar input { padding-left: 38px; }
.search-bar svg { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); width: 16px; height: 16px; color: var(--fg-dim); }

.toolbar { display: flex; gap: 10px; align-items: center; justify-content: space-between; flex-wrap: wrap; margin-bottom: 14px; }
.toolbar .left { display: flex; gap: 10px; flex: 1; min-width: 260px; }
.toolbar .right { display: flex; gap: 8px; align-items: center; }
.btn {
  appearance: none; border: 1px solid var(--border); background: var(--bg-elev); color: var(--fg);
  padding: 9px 14px; border-radius: 10px;
  font: inherit; cursor: pointer;
  transition: all var(--transition);
  display: inline-flex; gap: 6px; align-items: center;
}
.btn:hover { border-color: var(--border-strong); background: var(--bg-soft); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.btn.primary:hover { filter: brightness(1.06); }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.table-wrap { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
table.ms {
  width: 100%; border-collapse: separate; border-spacing: 0;
  font-size: .94rem;
}
table.ms th, table.ms td {
  padding: var(--row-pad-y, 10px) var(--row-pad-x, 14px);
  text-align: left; vertical-align: top;
  border-bottom: 1px solid var(--border);
}
table.ms thead th {
  background: var(--bg-soft);
  font-weight: 600;
  color: var(--fg-soft);
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  position: sticky; top: 0;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}
table.ms thead th:hover { color: var(--fg); }
table.ms thead th .sort-ind { opacity: .45; margin-left: 4px; }
table.ms thead th.sorted .sort-ind { opacity: 1; color: var(--accent); }
table.ms tbody tr { transition: background var(--transition); }
table.ms tbody tr:hover { background: color-mix(in srgb, var(--accent-weak) 50%, transparent); }
table.ms tbody tr:last-child td { border-bottom: 0; }
table.ms td.num { font-variant-numeric: tabular-nums; color: var(--fg-dim); }
table.ms td .title-link { font-family: var(--font-display); font-size: 1.05em; font-weight: 600; color: var(--fg); }
table.ms td .title-link:hover { color: var(--accent); }

.pagination { display: flex; gap: 6px; align-items: center; justify-content: center; margin-top: 18px; flex-wrap: wrap; }
.pagination .page { padding: 6px 10px; border-radius: 8px; font-variant-numeric: tabular-nums; color: var(--fg-soft); cursor: pointer; border: 1px solid transparent; }
.pagination .page:hover { background: var(--bg-soft); color: var(--fg); }
.pagination .page.on { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.pagination .ellip { color: var(--fg-dim); padding: 0 4px; }
.pagination .info { color: var(--fg-dim); margin: 0 10px; font-size: .9rem; }

/* ---------- skeleton / empty states ---------- */
.skeleton {
  background: linear-gradient(90deg, var(--bg-soft), var(--bg-muted), var(--bg-soft));
  background-size: 200% 100%;
  animation: shimmer 1.2s infinite linear;
  border-radius: 8px;
}
@keyframes shimmer { from { background-position: 200% 0 } to { background-position: -200% 0 } }
.empty { padding: 40px; text-align: center; color: var(--fg-dim); }

/* ---------- charts ---------- */
.chart-card h3 { margin-bottom: 12px; }
.chart-box { position: relative; height: 280px; width: 100%; }
.chart-box.tall { height: 340px; }
.chart-box canvas { width: 100% !important; height: 100% !important; display: block; }

/* ---------- detail ---------- */
.dd-grid { display: grid; grid-template-columns: 180px 1fr; gap: 10px 18px; }
.dd-grid dt { color: var(--fg-dim); text-transform: uppercase; letter-spacing: .08em; font-size: .78rem; padding-top: 4px; }
.dd-grid dd { margin: 0; }

.similar-strip { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.mini-card { padding: 14px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); transition: all var(--transition); }
.mini-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.mini-card .mini-title { font-family: var(--font-display); font-weight: 600; margin-bottom: 4px; }

/* ---------- author / subject cards ---------- */
.agg-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition);
  display: flex; flex-direction: column; justify-content: space-between; gap: 10px; min-height: 120px;
}
.agg-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.agg-card .name { font-family: var(--font-display); font-weight: 600; font-size: 1.1rem; color: var(--fg); }
.agg-card .meta { color: var(--fg-dim); font-size: .88rem; }
.agg-card .count-pill { position: absolute; top: 14px; right: 14px; background: var(--accent-weak); color: var(--accent); font-weight: 600; padding: 2px 10px; border-radius: 999px; font-size: .78rem; }

/* ---------- timeline ---------- */
.century-band { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 10px; }
.century-cell {
  flex: 0 0 110px;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px; text-align: center;
  transition: all var(--transition); cursor: pointer;
}
.century-cell:hover { transform: translateY(-2px); border-color: var(--accent); }
.century-cell .c-num { font-family: var(--font-display); font-size: 1.4rem; font-weight: 700; }
.century-cell .c-count { color: var(--fg-dim); font-size: .85rem; }

/* ---------- footer ---------- */
footer.site {
  padding: 40px 0 30px; color: var(--fg-dim);
  border-top: 1px solid var(--border); margin-top: 60px;
  background: color-mix(in srgb, var(--bg-elev) 70%, transparent);
}
footer.site .footer-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
  text-align: left;
}
@media (max-width: 800px) { footer.site .footer-grid { grid-template-columns: 1fr; gap: 20px; } }
footer.site .footer-h {
  margin: 0 0 8px; font-size: .78rem; text-transform: uppercase; letter-spacing: .12em;
  color: var(--accent); font-family: var(--font-sans); font-weight: 600;
}
footer.site .footer-p { margin: 0; font-size: .88rem; color: var(--fg-soft); line-height: 1.6; }
footer.site .footer-p a { font-weight: 500; }
footer.site .footer-hr { border: 0; border-top: 1px solid var(--border); margin: 24px 0 14px; }
footer.site .footer-bottom { display: block; text-align: center; }

.notice-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 12px; border-radius: 999px;
  background: var(--bg-elev); border: 1px solid var(--border);
  font-size: .78rem; color: var(--fg-soft);
  margin-bottom: 12px;
}
.notice-pill .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); display: inline-block; }

/* ---------- scrollbar ---------- */
::-webkit-scrollbar { height: 10px; width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-soft); }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: var(--fg-dim); }

/* ---------- fade-in page transition ---------- */
.page-in { animation: fadeUp .45s cubic-bezier(.2,.6,.2,1); }
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px);} to { opacity: 1; transform: none; } }

/* ---------- utilities ---------- */
.flex { display: flex; }
.flex.center { align-items: center; }
.flex.between { justify-content: space-between; align-items: center; }
.flex.gap-8 { gap: 8px; }
.flex.gap-12 { gap: 12px; }
.flex.wrap { flex-wrap: wrap; }
.mt-8 { margin-top: 8px; } .mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; }
.mb-8 { margin-bottom: 8px; } .mb-16 { margin-bottom: 16px; } .mb-24 { margin-bottom: 24px; }
.tabular { font-variant-numeric: tabular-nums; }
.nowrap { white-space: nowrap; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hidden-col { display: none !important; }

/* column toggle dropdown */
.dropdown { position: relative; }
.dropdown-menu {
  position: absolute; top: calc(100% + 6px); right: 0; z-index: 20;
  min-width: 200px; padding: 10px;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px;
  box-shadow: var(--shadow-card);
  transform: translateY(-8px); opacity: 0; pointer-events: none;
  transition: all var(--transition);
}
.dropdown.open .dropdown-menu { transform: none; opacity: 1; pointer-events: auto; }
.dropdown-menu label { display: flex; align-items: center; gap: 8px; padding: 5px 6px; font-size: .92rem; border-radius: 6px; cursor: pointer; }
.dropdown-menu label:hover { background: var(--bg-soft); }

/* focus ring for accessibility */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }