/* Tokens: dataviz reference palette (light + dark, selected per mode). */
:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --surface-2: #f3f2ee;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --ring: rgba(11, 11, 11, 0.10);
  --s1: #2a78d6; --s2: #eb6834; --s3: #1baf7a; --s4: #eda100;
  --s5: #e87ba4; --s6: #008300; --s7: #6250d6; --s8: #e34948;
  --seq-100: #cde2fb; --seq-250: #86b6ef; --seq-450: #2a78d6; --seq-650: #104281;
  --div-neg: #2a78d6; --div-mid: #f0efec; --div-pos: #e34948;
  --good: #0ca30c; --warning: #fab219; --serious: #ec835a; --critical: #d03b3b;
  --pending: #d6d4cc;
  --accent: #2a78d6;
  --shadow: 0 1px 2px rgba(11, 11, 11, 0.04), 0 8px 24px rgba(11, 11, 11, 0.04);
}
@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --page: #0d0d0d; --surface: #1a1a19; --surface-2: #232321;
    --ink: #f0efec; --ink-2: #c3c2b7; --muted: #898781; --grid: #2c2c2a; --axis: #383835;
    --ring: rgba(255, 255, 255, 0.10);
    --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500;
    --s5: #d55181; --s6: #008300; --s7: #9085e9; --s8: #e66767;
    --seq-100: #104281; --seq-250: #1c5cab; --seq-450: #3987e5; --seq-650: #b7d3f6;
    --div-neg: #3987e5; --div-mid: #383835; --div-pos: #e66767;
    --pending: #3a3a37; --accent: #3987e5;
    --shadow: none;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d0d0d; --surface: #1a1a19; --surface-2: #232321;
  --ink: #f0efec; --ink-2: #c3c2b7; --muted: #898781; --grid: #2c2c2a; --axis: #383835;
  --ring: rgba(255, 255, 255, 0.10);
  --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500;
  --s5: #d55181; --s6: #008300; --s7: #9085e9; --s8: #e66767;
  --seq-100: #104281; --seq-250: #1c5cab; --seq-450: #3987e5; --seq-650: #b7d3f6;
  --div-neg: #3987e5; --div-mid: #383835; --div-pos: #e66767;
  --pending: #3a3a37; --accent: #3987e5;
  --shadow: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 64px; }
body {
  margin: 0; background: var(--page); color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", "Noto Sans Arabic", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-underline-offset: 2px; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

/* Top bar */
.topbar {
  position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--page) 88%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--grid);
}
.topbar .wrap { display: flex; align-items: center; gap: 20px; height: 56px; }
.brand { font-weight: 650; letter-spacing: -0.01em; white-space: nowrap; color: var(--ink); text-decoration: none; }
.nav { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; flex: 1; }
.nav a { color: var(--ink-2); text-decoration: none; font-size: 14px; padding: 6px 10px; border-radius: 8px; white-space: nowrap; }
.nav a:hover, .nav a.on { background: var(--surface-2); color: var(--ink); }
.theme-btn { border: 1px solid var(--grid); background: var(--surface); color: var(--ink-2); border-radius: 8px; padding: 6px 10px; font: inherit; font-size: 13px; cursor: pointer; }

/* Hero */
.hero { padding: 56px 0 24px; }
.kicker { font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin: 0 0 12px; }
h1 { font-size: clamp(34px, 5.4vw, 60px); line-height: 1.04; letter-spacing: -0.03em; margin: 0 0 18px; font-weight: 700; max-width: 18ch; }
.lede { font-size: clamp(17px, 2vw, 20px); color: var(--ink-2); max-width: 64ch; margin: 0 0 28px; }
.live-pill { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--ink-2); background: var(--surface); border: 1px solid var(--grid); border-radius: 999px; padding: 4px 12px 4px 10px; }
.live-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--good); box-shadow: 0 0 0 3px color-mix(in srgb, var(--good) 25%, transparent); }
.live-dot.idle { background: var(--muted); box-shadow: none; }

.tiles { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 28px 0 8px; }
@media (min-width: 720px) { .tiles { grid-template-columns: repeat(6, minmax(0, 1fr)); } }
.tile { background: var(--surface); border: 1px solid var(--grid); border-radius: 14px; padding: 14px 16px; }
.tile .v { font-size: 26px; font-weight: 650; letter-spacing: -0.02em; line-height: 1.1; }
.tile .l { font-size: 13px; color: var(--ink-2); margin-top: 4px; }

/* Sections */
section { padding: 56px 0 8px; }
.sec-head { max-width: 760px; margin-bottom: 28px; }
h2 { font-size: clamp(26px, 3.4vw, 38px); letter-spacing: -0.02em; line-height: 1.12; margin: 0 0 12px; }
h3 { font-size: 20px; letter-spacing: -0.01em; margin: 0 0 6px; line-height: 1.25; }
.sec-head p, .note { color: var(--ink-2); margin: 0; }
.note { font-size: 14px; }

.card {
  background: var(--surface); border: 1px solid var(--grid); border-radius: 18px; padding: 20px;
  box-shadow: var(--shadow); min-width: 0;
}
@media (min-width: 720px) { .card { padding: 26px; } }
.card + .card { margin-top: 18px; }
.grid2 { display: grid; gap: 18px; }
@media (min-width: 900px) { .grid2 { grid-template-columns: 1fr 1fr; } }
.grid2 > .card + .card { margin-top: 0; }

/* Finding cards */
.finding { display: grid; gap: 22px; }
@media (min-width: 900px) { .finding { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); align-items: start; } }
.finding .num { font-size: clamp(40px, 6vw, 56px); font-weight: 700; letter-spacing: -0.03em; line-height: 1; margin: 6px 0 10px; }
.finding .num small { font-size: 16px; font-weight: 500; color: var(--ink-2); letter-spacing: 0; margin-left: 6px; }
.finding p { color: var(--ink-2); margin: 0 0 10px; }
.why { border-left: 2px solid var(--axis); padding-left: 12px; margin-top: 12px; font-size: 14px; color: var(--ink-2); }
.why b { color: var(--ink); font-weight: 600; }
.tag { display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: 0.02em; padding: 2px 8px; border-radius: 999px; background: var(--surface-2); color: var(--ink-2); margin-right: 6px; }
.tag.conf { background: color-mix(in srgb, var(--good) 14%, var(--surface)); color: var(--ink); }
.tag.expl { background: color-mix(in srgb, var(--warning) 18%, var(--surface)); color: var(--ink); }
.tag.neg { background: color-mix(in srgb, var(--s1) 14%, var(--surface)); color: var(--ink); }

/* Charts */
.chart { position: relative; width: 100%; }
.chart svg { display: block; width: 100%; height: auto; overflow: visible; }
.chart-title { font-size: 14px; font-weight: 600; margin: 0 0 2px; }
.chart-sub { font-size: 13px; color: var(--muted); margin: 0 0 10px; }
.axis text, .tick text { fill: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }
.axis path, .axis line, .tick line { stroke: var(--grid); }
.axis .domain { stroke: var(--axis); }
.gridline { stroke: var(--grid); stroke-width: 1; }
.refline { stroke: var(--ink-2); stroke-width: 1; opacity: 0.6; }
.lbl { fill: var(--ink-2); font-size: 12px; }
.lbl-strong { fill: var(--ink); font-size: 12px; font-weight: 600; }
.empty { color: var(--muted); font-size: 14px; padding: 28px 0; text-align: center; border: 1px dashed var(--grid); border-radius: 12px; }

.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 12px; color: var(--ink-2); margin: 8px 0 0; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }

.tip {
  position: fixed; pointer-events: none; z-index: 50; background: var(--surface); color: var(--ink);
  border: 1px solid var(--grid); border-radius: 10px; padding: 8px 10px; font-size: 12px; line-height: 1.45;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.12); max-width: 300px; opacity: 0; transition: opacity 0.08s;
}
.tip b { font-weight: 600; }
.tip .k { color: var(--muted); }

.tbl-toggle { margin-top: 10px; border: 0; background: none; color: var(--accent); font: inherit; font-size: 13px; cursor: pointer; padding: 0; }
.tbl-wrap { max-height: 280px; overflow: auto; margin-top: 8px; border: 1px solid var(--grid); border-radius: 10px; }
table.data { border-collapse: collapse; width: 100%; font-size: 12px; font-variant-numeric: tabular-nums; }
table.data th, table.data td { padding: 5px 10px; text-align: left; border-bottom: 1px solid var(--grid); white-space: nowrap; }
table.data th { position: sticky; top: 0; background: var(--surface-2); font-weight: 600; color: var(--ink-2); }

/* Multitrack */
.mt-controls { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 14px; }
.mt-controls select, .mt-controls input {
  font: inherit; font-size: 14px; padding: 7px 10px; border-radius: 10px; border: 1px solid var(--grid);
  background: var(--surface); color: var(--ink); max-width: 100%;
}
.mt-controls select { min-width: 0; flex: 1 1 260px; }
.mt-meta { font-size: 13px; color: var(--ink-2); }
.mt-meta [dir="rtl"] { font-weight: 600; color: var(--ink); }
.mt-readout { font-size: 12px; color: var(--ink-2); min-height: 18px; margin-top: 6px; font-variant-numeric: tabular-nums; }
.btn { font: inherit; font-size: 13px; padding: 6px 12px; border-radius: 10px; border: 1px solid var(--grid); background: var(--surface); color: var(--ink); cursor: pointer; }
.btn:hover { background: var(--surface-2); }

/* Samples */
.samples { display: grid; gap: 10px; margin-top: 16px; }
@media (min-width: 900px) { .samples { grid-template-columns: 1fr 1fr; } }
.sample { border: 1px solid var(--grid); border-radius: 12px; padding: 12px 14px; background: var(--surface); }
.sample .top { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--muted); margin-bottom: 4px; flex-wrap: wrap; }
.sample .top i { width: 8px; height: 8px; border-radius: 2px; display: inline-block; }
.sample .lab { font-weight: 600; color: var(--ink); font-size: 13px; }
.sample p { margin: 0; font-size: 14px; color: var(--ink-2); }

/* Pipeline / status */
.stages { display: grid; gap: 8px; }
.stage { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 16px; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--grid); }
.stage:last-child { border-bottom: 0; }
.stage .nm { font-weight: 600; font-size: 14px; }
.stage .md { font-size: 12px; color: var(--muted); }
.stage .st { font-size: 12px; font-weight: 600; display: inline-flex; align-items: center; gap: 6px; color: var(--ink-2); }
.stage .st i { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.meter { grid-column: 1 / -1; height: 6px; border-radius: 6px; background: var(--seq-100); overflow: hidden; }
.meter > div { height: 100%; border-radius: 6px; background: var(--seq-450); }
.meter.done > div { background: var(--good); }

/* Method diagram */
.flow { display: grid; gap: 10px; }
@media (min-width: 900px) { .flow { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.flow .col h4 { margin: 0 0 8px; font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.flow .box { border: 1px solid var(--grid); border-radius: 12px; padding: 10px 12px; background: var(--surface); margin-bottom: 8px; }
.flow .box b { display: block; font-size: 14px; }
.flow .box span { font-size: 12px; color: var(--ink-2); }

.limits { display: grid; gap: 12px; }
@media (min-width: 900px) { .limits { grid-template-columns: 1fr 1fr 1fr; } }
.limits .card h3 { font-size: 16px; }
.limits .card p { font-size: 14px; color: var(--ink-2); margin: 0; }

footer { padding: 56px 0 64px; color: var(--muted); font-size: 13px; }
footer p { margin: 0 0 6px; max-width: 80ch; }

.fade-in { animation: fade 0.5s ease both; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .fade-in { animation: none; } html { scroll-behavior: auto; } }