:root {
  --bg: #f6f7f5; --card: #fff; --ink: #16211e; --muted: #5d6b67; --line: #e1e6e3;
  --brand: #0f6b5c; --brand-ink: #fff; --sel: #e1efec;
  --ok: #1d7a3e; --ok-bg: #e5f4ea; --bad: #b3261e; --bad-bg: #fbe9e7; --warn: #9a5b00;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1513; --card: #18201e; --ink: #e7ecea; --muted: #9aa8a4; --line: #2a3431;
    --brand: #3fb59d; --brand-ink: #06201a; --sel: #1f3430;
    --ok: #5ccf86; --ok-bg: #16301f; --bad: #ff8a80; --bad-bg: #3a1a18; --warn: #f0b45a;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
/* System Arabic-script fonts only: zero font download. Android ships Noto Naskh (covers Pashto letters). */
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.8 "Noto Naskh Arabic", "Noto Sans Arabic", Tahoma, "Segoe UI", sans-serif;
  padding-bottom: calc(72px + env(safe-area-inset-bottom));
}
main { max-width: 640px; margin: 0 auto; padding: 12px 16px 24px; }
h1 { font-size: 1.45rem; margin: .25rem 0 .75rem; line-height: 1.5; }
h2 { font-size: 1.08rem; margin: 1.25rem 0 .5rem; }
h3 { font-size: .95rem; margin: 1rem 0 .3rem; color: var(--muted); }
p { margin: .25rem 0; }
a { color: inherit; text-decoration: none; }
.small { font-size: .875rem; }
.muted { color: var(--muted); }
.grow { flex: 1; min-width: 0; }
.loading { text-align: center; color: var(--muted); padding: 48px 0; }

.card { display: block; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; margin: 10px 0; }
.row { display: flex; align-items: center; gap: 12px; }
.hero { background: var(--brand); color: var(--brand-ink); border: 0; }
.hero p { opacity: .9; }
.top { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 46px; padding: 8px 16px; border-radius: 12px; border: 1px solid transparent;
  background: var(--brand); color: var(--brand-ink); font: inherit; font-weight: 700;
  cursor: pointer; text-align: center; white-space: nowrap;
}
.btn.block { display: flex; width: 100%; margin: 10px 0; }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.light { background: var(--brand-ink); color: var(--brand); }
.btn.danger { background: var(--bad-bg); color: var(--bad); }
.btn.on { border-color: var(--warn); color: var(--warn); }
.btn:disabled { opacity: .45; cursor: default; }

.bar { height: 6px; background: var(--line); border-radius: 6px; overflow: hidden; margin: 6px 0; }
.bar i { display: block; height: 100%; background: var(--brand); border-radius: 6px; transition: width .3s; }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.grid2 .card { margin: 0; }
.subj b { display: block; }
.subj .ico { display: inline-grid; place-items: center; width: 38px; height: 38px; border-radius: 10px; background: var(--c); color: #fff; font-weight: 700; margin-bottom: 4px; }

.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; flex-shrink: 0; }
.seg button { border: 0; background: var(--card); color: var(--ink); font: inherit; padding: 4px 12px; min-height: 42px; cursor: pointer; }
.seg .on { background: var(--brand); color: var(--brand-ink); font-weight: 700; }
.pill { background: var(--bad); color: #fff; border-radius: 999px; padding: 0 10px; font-weight: 700; }
.chip { display: inline-block; font-size: .8rem; background: var(--sel); padding: 0 10px; border-radius: 999px; }
.back { display: inline-flex; align-items: center; color: var(--muted); min-height: 44px; }

.nav { position: fixed; bottom: 0; inset-inline: 0; display: flex; background: var(--card); border-top: 1px solid var(--line); padding-bottom: env(safe-area-inset-bottom); z-index: 5; }
.nav[hidden] { display: none; }
.nav a { flex: 1; display: flex; flex-direction: column; align-items: center; padding: 6px 4px; font-size: .8rem; color: var(--muted); line-height: 1.4; }
.nav a span { font-size: 1.2rem; }
.nav a.on { color: var(--brand); font-weight: 700; }

/* Exam runner */
.runbar { display: flex; align-items: center; gap: 10px; position: sticky; top: 0; background: var(--bg); padding: 6px 0; z-index: 2; }
.iconbtn { width: 44px; height: 44px; flex-shrink: 0; border-radius: 12px; border: 1px solid var(--line); background: var(--card); color: var(--ink); font-size: 1.05rem; cursor: pointer; }
.timer { font-weight: 700; font-variant-numeric: tabular-nums; background: var(--card); border: 1px solid var(--line); padding: 2px 10px; border-radius: 10px; }
.timer.low { color: var(--bad); border-color: var(--bad); }
.progress .bar { margin: 0 0 8px; }
.stem { font-size: 1.1rem; margin: 0; }
.opts { display: grid; gap: 8px; }
.opt {
  display: flex; align-items: center; gap: 10px; width: 100%; text-align: start;
  background: var(--card); border: 1.5px solid var(--line); border-radius: 12px;
  padding: 8px 12px; min-height: 54px; font: inherit; color: inherit; cursor: pointer;
}
.opt .let { flex-shrink: 0; display: inline-grid; place-items: center; min-width: 36px; height: 36px; border-radius: 50%; background: var(--bg); font-size: .85rem; font-weight: 700; }
.opt.sel { border-color: var(--brand); background: var(--sel); }
.opt.ok { border-color: var(--ok); background: var(--ok-bg); }
.opt.bad { border-color: var(--bad); background: var(--bad-bg); }
.opt:disabled { cursor: default; opacity: 1; color: inherit; }
.expl { margin-top: 12px; }
.expl.good { border-color: var(--ok); }
.expl.badc, .badc { border-color: var(--bad); }
.okc { color: var(--ok); }
.badt { color: var(--bad); }
.actions { display: flex; gap: 8px; margin-top: 12px; }
.actions .btn { flex: 1; padding-inline: 6px; }
.qgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(44px, 1fr)); gap: 6px; margin-top: 10px; }
.qgrid button { min-height: 42px; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--ink); font: inherit; cursor: pointer; }
.qgrid .a { background: var(--sel); border-color: var(--brand); }
.qgrid .m { box-shadow: inset 0 -4px 0 var(--warn); }
.qgrid .cur { outline: 2px solid var(--brand); outline-offset: 1px; }
summary { cursor: pointer; font-weight: 700; min-height: 32px; }
.exam .q, .exam .opts { -webkit-user-select: none; user-select: none; }

/* Formulas: isolated LTR runs */
bdi.m { unicode-bidi: isolate; font-family: "Noto Sans", Roboto, "Segoe UI", sans-serif; white-space: nowrap; }

/* Results & lists */
.score { text-align: center; }
.score .big { font-size: 3rem; font-weight: 800; line-height: 1.3; }
.score.good .big { color: var(--ok); }
.score.mid .big { color: var(--warn); }
.score.low .big { color: var(--bad); }
.row2 { display: grid; grid-template-columns: minmax(84px, 1fr) 2fr auto; gap: 10px; align-items: center; padding: 6px 0; border-bottom: 1px solid var(--line); }
.row2:last-of-type { border-bottom: 0; }
.row2.total { border-top: 1px solid var(--line); margin-top: 4px; }
.stats3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.stat { text-align: center; margin: 0; padding: 10px 6px; }
.stat b { display: block; font-size: 1.35rem; }
.rules { padding-inline-start: 30px; }
:focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; }
@media (max-width: 360px) { .grid2 { grid-template-columns: 1fr; } }