/* Zaban styles. Colors are tokens; dark mode redefines them. */
:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef1f5;
  --text: #1b2330;
  --muted: #566176;
  --border: #d6dbe4;
  --accent: #1f5fd1;
  --accent-text: #ffffff;
  --accent-soft: #e1ebfb;
  --mark: #ffe58a;
  --mark-text: #1b2330;
  --focus: #1f5fd1;
  --formal: #5b3fc4;
  --semi: #0b7a6b;
  --friendly: #b45309;
  --radius: 10px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-fa: "Vazirmatn", Tahoma, "Segoe UI", system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #11151c; --surface: #1a212c; --surface-2: #232c3a; --text: #e8ecf3;
    --muted: #a3adbf; --border: #343f50; --accent: #6ea2ff; --accent-text: #0b1220;
    --accent-soft: #23345a; --mark: #7a6200; --mark-text: #fff6d1; --focus: #8ab4ff;
    --formal: #b9a6ff; --semi: #5fd6c4; --friendly: #f5b25f;
  }
}
:root[data-theme="dark"] {
  --bg: #11151c; --surface: #1a212c; --surface-2: #232c3a; --text: #e8ecf3;
  --muted: #a3adbf; --border: #343f50; --accent: #6ea2ff; --accent-text: #0b1220;
  --accent-soft: #23345a; --mark: #7a6200; --mark-text: #fff6d1; --focus: #8ab4ff;
  --formal: #b9a6ff; --semi: #5fd6c4; --friendly: #f5b25f;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: var(--font); font-size: 16px; line-height: 1.5;
  overflow-x: hidden;
}
:lang(fa) { font-family: var(--font-fa); }
button, input, select { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; inset-inline-start: 8px; top: -60px; background: var(--accent); color: var(--accent-text); padding: 8px 12px; border-radius: 6px; z-index: 50; }
.skip:focus { top: 8px; }

.wrap { max-width: 1280px; margin: 0 auto; padding: 0 16px; }

/* Header */
.top { background: var(--surface); border-bottom: 1px solid var(--border); }
.top .wrap { display: flex; flex-wrap: wrap; gap: 12px 24px; align-items: center; justify-content: space-between; padding-block: 14px; }
.brand h1 { margin: 0; font-size: 1.5rem; line-height: 1.2; }
.brand p { margin: 2px 0 0; color: var(--muted); font-size: .95rem; }
.top-tools { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.seg button { border: 0; background: var(--surface); padding: 6px 12px; cursor: pointer; min-height: 36px; }
.seg button + button { border-inline-start: 1px solid var(--border); }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-text); }
.icon-btn { border: 1px solid var(--border); background: var(--surface); border-radius: 8px; min-width: 36px; min-height: 36px; padding: 4px 8px; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; gap: 6px; }
.icon-btn:hover:not(:disabled) { background: var(--surface-2); }
.icon-btn:disabled { opacity: .45; cursor: not-allowed; }
.icon-btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.icon-btn.fav[aria-pressed="true"] svg { fill: currentColor; color: var(--friendly); }
.icon-btn.done { background: var(--accent-soft); }

/* Toolbar */
.toolbar { background: var(--surface); border-bottom: 1px solid var(--border); }
.toolbar .wrap { display: grid; gap: 12px; padding-block: 14px; }
.row { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; }
.field { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.field > span, .fieldset > legend { font-size: .8rem; color: var(--muted); padding: 0; }
.fieldset { border: 0; margin: 0; padding: 0; min-width: 0; }
.search { flex: 1 1 260px; }
input[type="search"], select {
  width: 100%; min-height: 40px; padding: 6px 10px; border: 1px solid var(--border);
  border-radius: 8px; background: var(--bg);
}
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip-check { position: relative; }
.chip-check input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.chip-check span { display: inline-block; padding: 5px 12px; border: 1px solid var(--border); border-radius: 999px; background: var(--bg); font-size: .9rem; }
.chip-check input:checked + span { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.chip-check input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 2px; }
.check { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }
.check input { width: 18px; height: 18px; }
.btn { border: 1px solid var(--border); background: var(--surface); padding: 6px 12px; border-radius: 8px; cursor: pointer; min-height: 36px; }
.btn:hover { background: var(--surface-2); }

/* Layout */
.layout { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 20px; padding-block: 20px; align-items: start; }
.nav { position: sticky; top: 12px; display: flex; flex-direction: column; gap: 6px; }
.nav button {
  display: flex; justify-content: space-between; align-items: center; gap: 8px; text-align: start;
  border: 1px solid var(--border); background: var(--surface); border-radius: var(--radius);
  padding: 10px 12px; cursor: pointer;
}
.nav button[aria-selected="true"] { border-color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.count { flex: none; min-width: 26px; text-align: center; padding: 0 8px; border-radius: 999px; background: var(--surface-2); font-size: .8rem; color: var(--muted); }
.nav button[aria-selected="true"] .count { background: var(--accent); color: var(--accent-text); }

.results-head { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.results-head h2 { margin: 0; font-size: 1.25rem; }
.sit { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 12px; }
.sit > summary { cursor: pointer; padding: 12px 14px; font-weight: 600; font-size: 1.05rem; display: flex; gap: 10px; align-items: center; justify-content: space-between; list-style: none; }
.sit > summary::-webkit-details-marker { display: none; }
.sit > summary::before { content: "▸"; color: var(--muted); }
.sit[open] > summary::before { content: "▾"; }
.sit > summary .t { flex: 1; }
.sit-body { padding: 0 14px 14px; display: grid; gap: 12px; }
.empty { padding: 14px; color: var(--muted); border: 1px dashed var(--border); border-radius: var(--radius); text-align: center; }

/* Concept card */
.card { border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; background: var(--bg); display: grid; gap: 10px; }
.card-head { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: space-between; }
.card-head h3 { margin: 0; font-size: 1rem; }
.pill { display: inline-block; padding: 1px 10px; border-radius: 999px; font-size: .78rem; border: 1px solid var(--border); background: var(--surface-2); color: var(--muted); }
.pill.lvl-formal { color: var(--formal); border-color: var(--formal); }
.pill.lvl-semi { color: var(--semi); border-color: var(--semi); }
.pill.lvl-friendly { color: var(--friendly); border-color: var(--friendly); }
.lvl { display: grid; gap: 6px; padding-top: 8px; border-top: 1px solid var(--border); }
.lvl-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.grid { display: grid; gap: 8px; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.cell { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; display: grid; gap: 4px; min-width: 0; }
.cell-head { display: flex; align-items: center; justify-content: space-between; gap: 6px; }
.lang-label { font-size: .75rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.cell-tools { display: inline-flex; gap: 4px; }
.cell-tools .icon-btn { min-width: 32px; min-height: 32px; padding: 2px 6px; }
.text { margin: 0; font-size: 1.05rem; overflow-wrap: anywhere; }
.text[lang="fa"] { font-size: 1.1rem; line-height: 1.8; }
.na { margin: 0; color: var(--muted); font-style: italic; }
.note { margin: 0; padding: 8px 10px; border-inline-start: 4px solid var(--accent); background: var(--accent-soft); border-radius: 6px; font-size: .92rem; }
.note b { font-weight: 600; }
mark { background: var(--mark); color: var(--mark-text); border-radius: 3px; padding: 0 1px; }

.error { margin: 40px auto; max-width: 640px; padding: 20px; border: 2px solid #c0392b; border-radius: var(--radius); background: var(--surface); }
.error h1 { margin-top: 0; font-size: 1.2rem; }
.error code { background: var(--surface-2); padding: 1px 6px; border-radius: 4px; }

@media (max-width: 800px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .nav { position: static; flex-direction: row; overflow-x: auto; padding-bottom: 6px; -webkit-overflow-scrolling: touch; }
  .nav button { flex: none; white-space: nowrap; }
  .grid { grid-template-columns: minmax(0, 1fr); }
}
@media (prefers-reduced-motion: no-preference) {
  .icon-btn, .btn, .chip-check span { transition: background-color .15s; }
}

/* View tabs (Phrasebook / English chunks) */
.viewtabs { background: var(--surface); border-bottom: 1px solid var(--border); }
.viewtabs .wrap { padding-block: 10px; }

/* English chunks */
.chunk-title { font-size: 1.2rem; }
.cell-tools-row { display: inline-flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.rels { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.rel { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; min-width: 0; }
.rel h4 { margin: 0 0 4px; font-size: .8rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.rel ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.rel li { display: grid; gap: 1px; }
.rel-src { font-weight: 600; }
.rel-tr { font-size: .88rem; color: var(--muted); overflow-wrap: anywhere; }
.examples > summary { cursor: pointer; font-weight: 600; padding: 4px 0; }
.ex-list { margin: 8px 0 0; padding-inline-start: 1.4rem; display: grid; gap: 10px; }
.ex { padding-bottom: 8px; border-bottom: 1px dashed var(--border); }
.ex:last-child { border-bottom: 0; }
.ex-src { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; font-size: 1.02rem; }
.ex-src > span { overflow-wrap: anywhere; }
.ex-tr { color: var(--muted); font-size: .95rem; overflow-wrap: anywhere; }
.ex-tr[lang="fa"] { line-height: 1.8; }
.chunk-hl { font-weight: 700; color: var(--text); background: var(--accent-soft); border-radius: 3px; padding: 0 2px; box-decoration-break: clone; -webkit-box-decoration-break: clone; }