/* Layout: one centered study column, cards only where something is tappable. */
:root {
  --bg: #f4f5f8;
  --surface: #ffffff;
  --surface-2: #eceef3;
  --fg: #17181c;
  --muted: #676b78;
  --line: #dfe2e9;
  --accent: #2f4fd8;
  --accent-fg: #ffffff;
  --accent-soft: #e6eafc;
  --good: #1f8a4c;
  --good-soft: #e3f4e9;
  --bad: #c9372c;
  --bad-soft: #fbe6e3;
  --warn-soft: #fbf1d9;
  --warn: #8a5a00;
  --ar: "IBM Plex Sans Arabic", "Geeza Pro", "Segoe UI", Tahoma, sans-serif;
  --en: "Source Serif 4", Georgia, "Times New Roman", "IBM Plex Sans Arabic", serif;
  --radius: 18px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111214;
    --surface: #1b1c20;
    --surface-2: #25262b;
    --fg: #eef0f4;
    --muted: #9a9eab;
    --line: #2e3036;
    --accent: #7f97ff;
    --accent-fg: #0d1230;
    --accent-soft: #232a4a;
    --good: #5fd08f;
    --good-soft: #17301f;
    --bad: #ff8a7d;
    --bad-soft: #3a1c19;
    --warn-soft: #33290f;
    --warn: #f2c25b;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--ar);
  font-size: 16px;
  line-height: 1.6;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
button { font: inherit; color: inherit; }
[hidden] { display: none !important; }

.wrap { max-width: 720px; margin: 0 auto; padding: 20px 16px 48px; }
.loading { color: var(--muted); text-align: center; padding-block: 40px; }

/* ---------- Type ---------- */
h1, h2, h3 { margin: 0; text-wrap: balance; line-height: 1.3; }
h1 { font-size: 1.65rem; font-weight: 700; }
h2 { font-size: 1.15rem; font-weight: 600; }
.sub { color: var(--muted); font-size: .95rem; margin: 4px 0 0; }
.en { font-family: var(--en); unicode-bidi: isolate; }
.eyebrow { font-size: .8rem; color: var(--muted); font-weight: 500; letter-spacing: .02em; }
.num { font-variant-numeric: tabular-nums; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 22px; border-radius: 999px; border: 0; cursor: pointer;
  background: var(--surface-2); color: var(--fg); font-weight: 600;
  transition: transform .12s ease, background .15s ease, opacity .15s ease;
}
.btn:active { transform: scale(.97); }
.btn.primary { background: var(--accent); color: var(--accent-fg); }
.btn:disabled { opacity: .4; cursor: default; transform: none; }
.btn.ghost { background: transparent; color: var(--accent); padding: 0 12px; }
.btn.small { min-height: 38px; padding: 0 14px; font-size: .9rem; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* ---------- Home ---------- */
.home-head { display: grid; gap: 6px; padding-block: 12px 22px; }
.section-title { margin: 26px 0 12px; font-size: 1rem; color: var(--muted); font-weight: 600; }
.cards { display: grid; gap: 12px; }
.card {
  display: flex; align-items: center; gap: 14px; width: 100%;
  padding: 18px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); text-align: right; cursor: pointer;
  transition: border-color .15s ease, transform .12s ease;
}
.card:hover { border-color: var(--accent); }
.card:active { transform: scale(.99); }
.card .icon {
  flex: none; width: 44px; height: 44px; border-radius: 12px;
  display: grid; place-items: center; background: var(--accent-soft); color: var(--accent);
}
.card .icon svg { width: 22px; height: 22px; }
.card .body { flex: 1; min-width: 0; }
.card .title { font-weight: 600; font-size: 1.05rem; }
.card .meta { color: var(--muted); font-size: .9rem; }
.card .count { color: var(--muted); font-size: .9rem; white-space: nowrap; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--line); background: var(--surface); border-radius: 999px;
  padding: 7px 14px; cursor: pointer; font-size: .92rem;
}
.chip .c { color: var(--muted); margin-inline-start: 4px; }
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.chip[aria-pressed="true"] .c { color: inherit; opacity: .8; }

/* ---------- Setup sheet ---------- */
.setup { display: grid; gap: 22px; }
.field { display: grid; gap: 10px; }
.field > label, .field > .label { font-weight: 600; }
.seg { display: flex; background: var(--surface-2); border-radius: 14px; padding: 4px; gap: 4px; }
.seg button {
  flex: 1; min-height: 42px; border: 0; border-radius: 10px; background: transparent; cursor: pointer; font-weight: 500;
}
.seg button[aria-pressed="true"] { background: var(--surface); box-shadow: 0 1px 3px rgba(0,0,0,.12); font-weight: 600; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 18px; }

/* ---------- Quiz ---------- */
.quiz-head { text-align: center; display: grid; gap: 2px; margin-bottom: 18px; }
.progress-row { display: flex; align-items: center; gap: 12px; margin-bottom: 26px; }
.bar { flex: 1; height: 6px; background: var(--surface-2); border-radius: 99px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--accent); border-radius: inherit; transition: width .25s ease; }
.pill { min-width: 34px; height: 30px; padding: 0 10px; border-radius: 99px; display: inline-grid; place-items: center; font-weight: 600; font-size: .9rem; }
.pill.good { background: var(--good-soft); color: var(--good); }
.pill.bad { background: var(--bad-soft); color: var(--bad); }
.pos { color: var(--muted); font-size: .95rem; white-space: nowrap; }

.qnum { font-weight: 600; margin-bottom: 8px; }
.qtext { font-size: 1.28rem; line-height: 1.55; margin: 0 0 6px; overflow-wrap: anywhere; }
.tr {
  margin: 10px 0 0; padding: 12px 14px; border-radius: 12px; background: var(--surface-2);
  color: var(--fg); font-size: 1rem;
}
.tr small { color: var(--muted); display: block; }
.tools { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 18px; }
.tool {
  display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line); background: var(--surface);
  border-radius: 999px; padding: 6px 14px; cursor: pointer; font-size: .92rem;
}
.tool svg { width: 16px; height: 16px; }
.tool[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

.options { display: grid; gap: 10px; }
.opt {
  width: 100%; min-height: 58px; padding: 14px 18px; border-radius: 16px; border: 1.5px solid transparent;
  background: var(--surface); text-align: left; cursor: pointer; font-size: 1.08rem;
  display: flex; align-items: center; gap: 12px;
  transition: border-color .15s ease, background .15s ease;
}
.opt.ar-opt { text-align: right; font-family: var(--ar); }
.opt .k { flex: none; width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; font-size: .82rem; font-family: var(--ar); background: var(--surface-2); color: var(--muted); }
.opt:hover:not(:disabled) { border-color: var(--line); }
.opt:disabled { cursor: default; }
.opt.correct { background: var(--good-soft); border-color: var(--good); }
.opt.correct .k { background: var(--good); color: var(--surface); }
.opt.wrong { background: var(--bad-soft); border-color: var(--bad); }
.opt.wrong .k { background: var(--bad); color: var(--surface); }
.opt.dim { opacity: .55; }

.hint, .explain, .note { margin-top: 14px; padding: 12px 14px; border-radius: 12px; font-size: .98rem; }
.hint { background: var(--accent-soft); }
.explain.good { background: var(--good-soft); }
.explain.bad { background: var(--bad-soft); }
.explain b { display: block; }
.note { background: var(--warn-soft); color: var(--fg); }
.note b { color: var(--warn); }

.nav { display: flex; gap: 10px; margin-top: 28px; }
.nav .btn { flex: 1; }
.nav .btn.primary { flex: 1.4; }

/* ---------- Results ---------- */
.score { text-align: center; display: grid; gap: 4px; justify-items: center; padding-block: 18px 8px; }
.ring { width: 150px; height: 150px; }
.ring circle { fill: none; stroke-width: 12; }
.ring .track { stroke: var(--surface-2); }
.ring .val { stroke: var(--accent); stroke-linecap: round; transition: stroke-dashoffset .8s ease; }
.ring text { fill: var(--fg); font-family: var(--ar); font-weight: 700; font-size: 30px; }
.result-actions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin: 18px 0 26px; }
.review { display: grid; gap: 12px; }
.ritem { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.ritem .q { font-size: 1.05rem; margin-bottom: 6px; overflow-wrap: anywhere; }
.ritem .tag { font-size: .85rem; font-weight: 600; }
.ritem .tag.good { color: var(--good); }
.ritem .tag.bad { color: var(--bad); }
.ritem .ans { margin-top: 6px; display: grid; gap: 2px; font-size: .95rem; }
.ritem .muted { color: var(--muted); font-size: .92rem; }

/* ---------- Vocabulary ---------- */
.search {
  width: 100%; min-height: 48px; padding: 0 16px; border-radius: 14px; border: 1px solid var(--line);
  background: var(--surface); color: var(--fg); font: inherit;
}
.vlist { margin-top: 14px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.vrow { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; padding: 13px 16px; border-top: 1px solid var(--line); align-items: center; }
.vrow:first-child { border-top: 0; }
.vrow .en { font-size: 1.05rem; font-weight: 600; }
.vrow .u { color: var(--muted); font-size: .8rem; }
.empty { color: var(--muted); text-align: center; padding: 24px; }
.vtools { display: grid; gap: 12px; }

.foot { margin-top: 40px; color: var(--muted); font-size: .85rem; text-align: center; }

@media (min-width: 640px) {
  .wrap { padding-top: 40px; }
  h1 { font-size: 2rem; }
  .qtext { font-size: 1.4rem; }
  .cards.two { grid-template-columns: 1fr 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}
.fade { animation: fade .22s ease; }
@keyframes fade { from { opacity: .4; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* ---------- Links & static pages ---------- */
a { color: var(--accent); }
a.card, a.chip, a.btn { text-decoration: none; color: inherit; }
a.btn.primary { color: var(--accent-fg); }
a.btn.ghost { color: var(--accent); }
.home-head .sub { max-width: 60ch; }
.olist { list-style: none; padding: 0; margin: 10px 0; display: grid; gap: 6px; }
.olist li { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; padding: 8px 12px; border-radius: 12px; background: var(--surface-2); }
.olist li.ok { background: var(--good-soft); outline: 1.5px solid var(--good); }
.olist .k { flex: none; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; font-size: .8rem; background: var(--surface); color: var(--muted); }
.olist li.ok .k { background: var(--good); color: var(--surface); }
.okmark { color: var(--good); font-size: .85rem; font-weight: 600; }
.ritem p { margin: 6px 0; }
.ritem .q { font-size: 1.1rem; text-align: left; }
.ritem .tag { color: var(--muted); }
section { scroll-margin-top: 16px; }
.vsec p { margin: 12px 0 0; }
.tools + .hint { margin: -4px 0 16px; }

/* Verification marks and report */
.fixmark { color: var(--good); font-weight: 600; text-decoration: none; }
.flagmark { color: var(--warn); font-weight: 600; }
.kv { display: grid; grid-template-columns: 7.5em 1fr; gap: 8px; margin-top: 6px; font-size: .95rem; }
.kv .k2 { color: var(--muted); }
.kv > span { overflow-wrap: anywhere; }
@media (max-width: 420px) { .kv { grid-template-columns: 1fr; gap: 0; } }

/* Monochrome icons and question source labels */
.ico { width: 1em; height: 1em; vertical-align: -0.15em; flex: none; }
.btn .ico { margin-inline-end: 4px; }
.okmark { display: inline-flex; align-items: center; gap: 4px; }
.srcl { display: inline-flex; align-items: center; gap: 4px; font-size: .82rem; font-weight: 600; padding: 1px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); }
.srcl-leak { color: var(--good); border-color: currentColor; }
.srcl-ai { color: var(--fg); }
.srcl-unsure { color: var(--warn); border-color: currentColor; }