:root {
  color-scheme: light;
  --bg: #f5f1e8;
  --paper: #fffdf8;
  --ink: #20303a;
  --muted: #6a7780;
  --line: #e3dccc;
  --accent: #1f6f54;
  --accent-soft: #e6f0eb;
  --accent-ink: #14543f;
  --noun: #1f6f54;
  --noun-bg: #e6f0eb;
  --adj: #b06a1f;
  --adj-bg: #f7ecdd;
  --shadow: 0 1px 2px rgba(32, 48, 58, .06), 0 6px 24px rgba(32, 48, 58, .07);

  /* themeable surfaces & accents (see [data-theme="dark"] for the dark values) */
  --header-grad-a: #fffdf8;
  --header-grad-b: #f7f2e7;
  --field-bg: #fff;
  --chip-active-ink: #fff;
  --th-bg: var(--accent);
  --th-ink: #fff;
  --download-border: #cfe2da;
  --download-hover: #d8ebe3;
  --mark-bg: #ffe98a;
  --pill-bg: #efeadd;
  --pair-bg: #f4efe2;
  --pair-border: #eadfca;
  --pair-ink: #2c3b44;
  --cond-dot: #c3b89c;
  --shadh-ink: #9a3b2e;
  --shadh-bg: #f6e1dc;
  --row-hover: #fbf7ee;
  --group-border: #d6cdb8;
  --col-group-bg: #faf6ec;
  --filter-x-bg: #cfe2da;
  --filter-x-hover: #aed6c7;
  --cell-line: #efe9da;
  --col-line: #f0eadc;
  --rowh-hover: #f3eee1;
  --sw-border: rgba(0, 0, 0, .08);
  --tip-bg: #fff;
  --tip-shadow: 0 8px 30px rgba(32, 48, 58, .18);
  /* Sankey (ECharts) reads these via getComputedStyle */
  --sankey-singular: #1f6f54;
  --sankey-plural: #c8772b;

  /* one typeface across the whole site */
  --arabic: "Noto Naskh Arabic", "Amiri", "Times New Roman", serif;
  --ui: "Noto Naskh Arabic", "Amiri", "Times New Roman", serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #14181b;
  --paper: #1b2125;
  --ink: #e6edef;
  --muted: #9aa6ac;
  --line: #2c353a;
  --accent: #3fae86;
  --accent-soft: #1d322b;
  --accent-ink: #7fdcb8;
  --noun: #46b88e;
  --noun-bg: #173028;
  --adj: #d79a57;
  --adj-bg: #38291a;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 6px 24px rgba(0, 0, 0, .45);

  --header-grad-a: #1c2327;
  --header-grad-b: #161b1e;
  --field-bg: #232b30;
  --chip-active-ink: #0d1316;
  --th-bg: #1f2d27;
  --th-ink: #bfead7;
  --download-border: #2f4a40;
  --download-hover: #244038;
  --mark-bg: #7a6414;
  --pill-bg: #2a3338;
  --pair-bg: #232b30;
  --pair-border: #333d43;
  --pair-ink: #d6e2e6;
  --cond-dot: #5a666c;
  --shadh-ink: #f0a99c;
  --shadh-bg: #3e211c;
  --row-hover: #222a2f;
  --group-border: #3a454b;
  --col-group-bg: #1f262a;
  --filter-x-bg: #2f4a40;
  --filter-x-hover: #3a5c50;
  --cell-line: #2a3236;
  --col-line: #2a3236;
  --rowh-hover: #262d31;
  --sw-border: rgba(255, 255, 255, .14);
  --tip-bg: #1f272b;
  --tip-shadow: 0 8px 30px rgba(0, 0, 0, .5);
  --sankey-singular: #46b88e;
  --sankey-plural: #d79a57;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--ui); font-size: 16px; line-height: 1.6;
}
.wrap { max-width: 1180px; margin-inline: auto; padding-inline: 20px; }

/* ---------- header ---------- */
.site-header { background: linear-gradient(180deg, var(--header-grad-a), var(--header-grad-b)); border-bottom: 1px solid var(--line); padding-block: 28px 22px; }
.title-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 14px; }
.logo-link { display: inline-flex; color: var(--accent); transition: color .15s, transform .15s; }
.logo-link:hover { color: var(--accent-ink); transform: scale(1.04); }
.wtb-logo { width: auto; height: clamp(40px, 8vw, 56px); display: block; }
.header-actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
h1 { font-family: var(--arabic); font-weight: 700; font-size: clamp(2rem, 5vw, 3rem); margin: 0; color: var(--accent-ink); letter-spacing: .5px; }
.repo-link { color: var(--accent); text-decoration: none; font-weight: 600; font-size: .9rem; }
.repo-link:hover { text-decoration: underline; }
.subtitle { font-size: 1.08rem; margin: .4rem 0 0; }
.subtitle strong { color: var(--accent-ink); }
.credits { margin: .5rem 0 0; color: var(--muted); font-size: .9rem; line-height: 1.9; }
.credits .sep { color: var(--line); margin-inline: 6px; font-weight: 700; }
.credits a { color: var(--accent); text-decoration: none; font-weight: 600; }
.credits a:hover { text-decoration: underline; }
.stats { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.stat { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 8px 14px; box-shadow: var(--shadow); display: flex; align-items: baseline; gap: 8px; }
.stat b { font-size: 1.25rem; color: var(--accent-ink); font-family: var(--arabic); }
.stat span { color: var(--muted); font-size: .85rem; }
.downloads { margin-top: 16px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.dl-label { color: var(--muted); font-size: .9rem; }
.downloads a { text-decoration: none; color: var(--accent-ink); background: var(--accent-soft); border: 1px solid var(--download-border); border-radius: 8px; padding: 5px 12px; font-weight: 600; font-size: .85rem; }
.downloads a:hover { background: var(--download-hover); }

/* ---------- theme toggle ---------- */
.theme-toggle { display: inline-flex; align-items: center; gap: 2px; background: var(--field-bg); border: 1px solid var(--line); border-radius: 999px; padding: 3px; }
.theme-btn { appearance: none; cursor: pointer; border: 0; background: transparent; color: var(--muted); width: 32px; height: 28px; padding: 0; border-radius: 999px; display: inline-flex; align-items: center; justify-content: center; transition: background-color .15s, color .15s; }
.theme-btn .ic { width: 16px; height: 16px; }
.theme-btn:hover { color: var(--accent-ink); }
.theme-btn.is-active { background: var(--accent); color: var(--chip-active-ink); }

/* ---------- tabs ---------- */
.tabs { display: flex; gap: 8px; margin-top: 22px; flex-wrap: wrap; }
.tab { appearance: none; cursor: pointer; font-family: var(--ui); font-size: 1.02rem; font-weight: 700; color: var(--muted); padding: 11px 22px; border: 1px solid var(--line); background: var(--field-bg); border-radius: 999px; box-shadow: var(--shadow); transition: background-color .15s, color .15s, border-color .15s; }
.tab:hover { color: var(--accent-ink); border-color: var(--accent); }
.tab.is-active { background: var(--accent); border-color: var(--accent); color: var(--chip-active-ink); }
.tab.is-active:hover { color: var(--chip-active-ink); }

/* ---------- views & controls ---------- */
.view { display: none; padding-block: 22px 48px; }
.view.is-active { display: block; }
.controls { display: flex; flex-wrap: wrap; gap: 16px 28px; align-items: flex-end; background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; box-shadow: var(--shadow); }
.control { display: flex; flex-direction: column; gap: 8px; }
.control.search { flex: 1 1 280px; }
.control-label { font-size: .8rem; color: var(--muted); font-weight: 600; }
#search { width: 100%; font-family: var(--arabic); font-size: 1.15rem; padding: 10px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--field-bg); color: var(--ink); }
#search:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip { appearance: none; cursor: pointer; font-family: var(--ui); font-size: .9rem; border: 1px solid var(--line); background: var(--field-bg); color: var(--muted); padding: 7px 13px; border-radius: 999px; font-weight: 600; }
.chip:hover { border-color: var(--accent); color: var(--accent-ink); }
.chip.is-active { background: var(--accent); border-color: var(--accent); color: var(--chip-active-ink); }
select { font-family: var(--arabic); font-size: 1.1rem; min-width: 240px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--field-bg); color: var(--ink); }
.graph-hint { color: var(--muted); font-size: .9rem; margin: 0; flex: 1 1 260px; line-height: 1.7; }
.result-count { color: var(--muted); font-size: .9rem; margin: 16px 2px 8px; }

.active-filter { margin: 16px 2px 0; }
.filter-chip { display: inline-flex; align-items: center; gap: 10px; font-family: var(--arabic); font-size: 1.2rem; background: var(--accent-soft); border: 1px solid var(--download-border); color: var(--accent-ink); border-radius: 999px; padding: 5px 8px 5px 16px; }
.filter-chip .x { appearance: none; border: 0; background: var(--filter-x-bg); color: var(--accent-ink); width: 22px; height: 22px; border-radius: 50%; cursor: pointer; font-family: var(--ui); font-size: .8rem; line-height: 1; }
.filter-chip .x:hover { background: var(--filter-x-hover); }

.reset-btn { align-self: flex-end; display: inline-flex; align-items: center; gap: 7px; }
.reset-btn .ic { width: 19px; height: 19px; flex: none; }
.empty { text-align: center; color: var(--muted); padding: 40px; font-size: 1.05rem; }
mark { background: var(--mark-bg); color: inherit; border-radius: 3px; padding: 0 1px; }

/* ---------- shared pattern token ---------- */
.pattern { font-family: var(--arabic); font-size: 1.25rem; font-weight: 700; color: var(--accent-ink); white-space: nowrap; }
.pattern.clickable { cursor: pointer; }
.pattern.clickable:hover { text-decoration: underline dotted; text-underline-offset: 3px; }
.pattern.big { font-size: 2.2rem; }
.tag { display: inline-block; font-size: .78rem; font-weight: 700; padding: 2px 10px; border-radius: 999px; font-family: var(--ui); }
.tag.noun { color: var(--noun); background: var(--noun-bg); }
.tag.adj { color: var(--adj); background: var(--adj-bg); }
.count-pill { font-family: var(--ui); font-size: .72rem; color: var(--muted); background: var(--pill-bg); border-radius: 999px; padding: 1px 8px; margin-inline-start: 8px; vertical-align: middle; }

/* ---------- structured examples ---------- */
.ex-block { margin-bottom: 9px; }
.ex-block:last-child { margin-bottom: 0; }
.ex-head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 5px; }
.cond { font-family: var(--ui); font-size: .92rem; font-weight: 600; color: var(--ink); }
.cond::before { content: "•"; margin-inline-end: 6px; color: var(--cond-dot); }
.badge-shadh { font-family: var(--ui); font-size: .72rem; font-weight: 700; color: var(--shadh-ink); background: var(--shadh-bg); border-radius: 999px; padding: 1px 9px; }
.ex-pairs { display: flex; flex-wrap: wrap; gap: 6px; }
.pair { font-family: var(--arabic); font-size: 1.16rem; background: var(--pair-bg); border: 1px solid var(--pair-border); border-radius: 8px; padding: 2px 10px; white-space: nowrap; }
.pair b { font-weight: 700; color: var(--pair-ink); }
.pair i { color: var(--accent); font-style: normal; margin: 0 6px; font-weight: 700; }
.ex-note { display: block; font-family: var(--ui); font-size: .82rem; color: var(--muted); margin-top: 5px; line-height: 1.7; }

/* ---------- table ---------- */
.table-scroll { overflow-x: auto; border-radius: 14px; box-shadow: var(--shadow); border: 1px solid var(--line); }
.data-table { width: 100%; border-collapse: collapse; background: var(--paper); }
.data-table thead th { position: sticky; top: 0; z-index: 2; background: var(--th-bg); color: var(--th-ink); font-weight: 700; font-size: .92rem; text-align: right; padding: 12px 14px; white-space: nowrap; }
.data-table tbody td { padding: 12px 14px; border-top: 1px solid var(--line); vertical-align: top; }
.data-table tbody tr:hover { background: var(--row-hover); }
.data-table .group-start td { border-top: 2px solid var(--group-border); }
.col-group { background: var(--col-group-bg); }
.col-group .pattern { font-size: 1.4rem; }
td.col-examples { max-width: 680px; }

/* ---------- matrix ---------- */
.legend { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; font-size: .82rem; color: var(--muted); }
.legend .sw { display: inline-block; width: 13px; height: 13px; border-radius: 3px; vertical-align: -2px; margin-inline-end: 5px; border: 1px solid var(--sw-border); }
.sw.noun { background: var(--noun); }
.sw.adj { background: var(--adj); }
.sw.both { background: linear-gradient(135deg, var(--noun) 50%, var(--adj) 50%); }
.legend-hint { flex-basis: 100%; color: var(--muted); }

.matrix-scroll { margin-top: 18px; overflow: auto; max-height: 80vh; border: 1px solid var(--line); border-radius: 14px; background: var(--paper); box-shadow: var(--shadow); }
table.matrix { border-collapse: separate; border-spacing: 0; }
.matrix th, .matrix td { padding: 0; }
.matrix .corner { position: sticky; top: 0; right: 0; z-index: 6; background: var(--th-bg); color: var(--th-ink); font-family: var(--ui); font-weight: 700; padding: 8px 10px; min-width: 96px; border-bottom: 2px solid var(--accent); vertical-align: bottom; }
.matrix .corner .cax, .matrix .corner .rax { display: block; font-size: .74rem; line-height: 1.7; white-space: nowrap; }
/* horizontal headers — no transforms, so they can never overlap the first row */
.matrix .col-h { position: sticky; top: 0; z-index: 4; background: var(--paper); min-width: 50px; padding: 9px 4px; vertical-align: middle; text-align: center; border-bottom: 2px solid var(--accent); border-inline-start: 1px solid var(--col-line); }
.matrix .col-h .pattern { font-size: .74rem; white-space: nowrap; }
.matrix .row-h { position: sticky; right: 0; z-index: 3; background: var(--paper); text-align: right; padding: 0 10px; white-space: nowrap; border-inline-end: 2px solid var(--accent); }
.matrix .row-h .pattern { font-size: 1.02rem; }
.m-cell { width: 50px; height: 28px; border-top: 1px solid var(--cell-line); border-inline-start: 1px solid var(--cell-line); }
.matrix tbody tr:first-child .m-cell { border-top: none; }
.m-cell.on { cursor: pointer; }
.m-cell.on.noun { background: var(--noun); }
.m-cell.on.adj { background: var(--adj); }
.m-cell.on.both { background: linear-gradient(135deg, var(--noun) 50%, var(--adj) 50%); }
.m-cell.on:hover { outline: 2px solid var(--ink); outline-offset: -2px; }
.matrix tbody tr:hover .row-h { background: var(--rowh-hover); }

/* ---------- tooltip ---------- */
.tooltip { position: fixed; z-index: 50; pointer-events: none; max-width: 380px; background: var(--tip-bg); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--tip-shadow); padding: 12px 14px; }
.tip-title { font-family: var(--arabic); font-size: 1.2rem; margin-bottom: 8px; color: var(--accent-ink); }
.tip-row { display: flex; gap: 8px; align-items: flex-start; padding: 4px 0; }
.tip-row + .tip-row { border-top: 1px solid var(--line); }

/* ---------- sankey ---------- */
.sankey-axes { display: flex; justify-content: space-between; margin: 16px 10px 0; font-family: var(--ui); font-size: .92rem; font-weight: 700; color: var(--ink); }
.sankey-axes .ax { display: inline-flex; align-items: center; gap: 7px; }
.sankey-axes .sw { width: 14px; height: 14px; border-radius: 3px; }
.sw.singular { background: var(--noun); }
.sankey { margin-top: 10px; width: 100%; height: 720px; background: var(--paper); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); }

/* ---------- footer ---------- */
.site-footer { padding-block: 28px 48px; color: var(--muted); font-size: .9rem; border-top: 1px solid var(--line); margin-top: 10px; }
.site-footer p { margin: 0 0 6px; }
.site-footer a { color: var(--accent); text-decoration: none; font-weight: 600; }
.site-footer a:hover { text-decoration: underline; }
.muted { color: var(--muted); }

@media (max-width: 640px) {
  .data-table tbody td, .data-table thead th { padding: 9px 10px; }
  .pair { font-size: 1.06rem; }
  .sankey { height: 560px; }
}