:root {
  --bg: #f6f7fb; --card: #ffffff; --ink: #0f172a; --mute: #5b6478; --line: #e3e7ef;
  --acc: #4f46e5; --acc-ink: #ffffff; --ok: #059669; --ko: #dc2626; --warn: #d97706;
  --sel: #eef2ff; --radius: 16px; --shadow: 0 1px 2px rgb(0 0 0 / .05), 0 4px 16px rgb(0 0 0 / .05);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1020; --card: #131a2e; --ink: #e8ecf6; --mute: #96a0b8; --line: #243050;
    --acc: #818cf8; --acc-ink: #0b1020; --ok: #34d399; --ko: #f87171; --warn: #fbbf24; --sel: #1e2747;
    --shadow: none;
  }
}
:root[data-theme="dark"] {
  --bg: #0b1020; --card: #131a2e; --ink: #e8ecf6; --mute: #96a0b8; --line: #243050;
  --acc: #818cf8; --acc-ink: #0b1020; --ok: #34d399; --ko: #f87171; --warn: #fbbf24; --sel: #1e2747;
  --shadow: none;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--ink);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
  -webkit-tap-highlight-color: transparent;
}
button { font: inherit; color: inherit; cursor: pointer; }
.top { display: flex; justify-content: space-between; align-items: center; padding: 12px 16px; max-width: 760px; margin: 0 auto; }
.brand { display: flex; gap: 8px; align-items: center; background: none; border: 0; font-weight: 700; font-size: 18px; padding: 0; }
.brand svg { width: 22px; height: 22px; fill: var(--acc); }
.top-right { display: flex; gap: 8px; align-items: center; }
.icon { background: none; border: 0; font-size: 20px; padding: 4px 8px; }
.pill { font-size: 12px; color: var(--ok); }
.pill.off { color: var(--mute); }
main { max-width: 760px; margin: 0 auto; padding: 0 16px 24px; }
.legal { max-width: 760px; margin: 0 auto; padding: 8px 16px 24px; font-size: 11px; color: var(--mute); }
.loading { color: var(--mute); }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin: 12px 0; box-shadow: var(--shadow); }
h1 { font-size: 22px; margin: 8px 0; } h2 { font-size: 17px; margin: 0 0 8px; }
.mute { color: var(--mute); font-size: 14px; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }

a.btn { display: inline-flex; align-items: center; justify-content: center; text-decoration: none; }
.btn { border: 1px solid var(--line); background: var(--card); border-radius: 12px; padding: 12px 16px; font-weight: 600; min-height: 48px; }
.btn.primary { background: var(--acc); color: var(--acc-ink); border-color: var(--acc); }
.btn.ghost { background: transparent; }
.btn.block { width: 100%; }
.btn:disabled { opacity: .45; cursor: default; }
.btn kbd { font-size: 11px; opacity: .7; margin-left: 6px; }
.tile { text-align: left; display: flex; flex-direction: column; gap: 2px; }
.tile b { font-size: 15px; } .tile span { font-weight: 400; font-size: 13px; color: var(--mute); }
.btn.primary.tile span { color: inherit; opacity: .85; }

.gauge { display: flex; align-items: center; gap: 16px; }
.ring { --p: 0; width: 92px; height: 92px; border-radius: 50%; display: grid; place-items: center; flex: none;
  background: conic-gradient(var(--acc) calc(var(--p) * 1%), var(--line) 0); }
.ring > div { width: 74px; height: 74px; border-radius: 50%; background: var(--card); display: grid; place-items: center; font-weight: 800; font-size: 20px; }
.bars { display: grid; gap: 8px; }
.bar { display: grid; grid-template-columns: 34px 1fr 44px; gap: 8px; align-items: center; font-size: 13px; }
.bar .track { height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; }
.bar .fill { height: 100%; background: var(--acc); border-radius: 99px; }
.bar.weak .fill { background: var(--warn); }
.bar button { all: unset; cursor: pointer; font-weight: 700; }

.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.seg button { border: 0; background: transparent; padding: 8px 14px; }
.seg button[aria-pressed="true"] { background: var(--acc); color: var(--acc-ink); }

.progress { height: 4px; background: var(--line); border-radius: 99px; overflow: hidden; margin: 8px 0 4px; }
.progress > div { height: 100%; background: var(--acc); transition: width .2s; }
.qmeta { display: flex; justify-content: space-between; font-size: 13px; color: var(--mute); }
.stem { font-size: 17px; line-height: 1.55; margin: 12px 0 16px; white-space: pre-wrap; }
.opts { display: grid; gap: 10px; }
.opt { display: grid; grid-template-columns: 28px 1fr; gap: 10px; text-align: left; border: 1.5px solid var(--line); background: var(--card); border-radius: 12px; padding: 12px; min-height: 52px; align-items: start; }
.opt .k { width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center; font-weight: 700; font-size: 13px; background: var(--sel); }
.opt[aria-pressed="true"] { border-color: var(--acc); background: var(--sel); }
.opt.ok { border-color: var(--ok); } .opt.ok .k { background: var(--ok); color: #fff; }
.opt.ko { border-color: var(--ko); } .opt.ko .k { background: var(--ko); color: #fff; }
.opt .why { grid-column: 2; font-size: 13px; color: var(--mute); margin-top: 6px; }
.actions { display: flex; gap: 10px; margin-top: 16px; position: sticky; bottom: 8px; }
.actions .btn { flex: 1; }
.toggle { display: inline-flex; gap: 8px; align-items: center; font-size: 14px; user-select: none; }
.toggle input { width: 20px; height: 20px; accent-color: var(--acc); }
.feedback { border-left: 4px solid var(--acc); padding: 8px 12px; margin-top: 12px; background: var(--sel); border-radius: 8px; }
.feedback.ok { border-color: var(--ok); } .feedback.ko { border-color: var(--ko); }
.refs { font-size: 12px; color: var(--mute); margin-top: 6px; }
.verdict { font-size: 28px; font-weight: 800; }
.verdict.pass { color: var(--ok); } .verdict.fail { color: var(--ko); }
.ai { white-space: pre-wrap; font-size: 14px; }
label.field { display: grid; gap: 4px; margin: 10px 0; font-size: 14px; }
input[type="password"], input[type="text"], input[type="number"], select { font: inherit; padding: 10px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); }
.timer { font-variant-numeric: tabular-nums; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }
.chip { display: inline-block; font-size: 11px; font-weight: 700; padding: 1px 8px; border-radius: 99px; background: var(--sel); color: var(--ink); vertical-align: middle; }
.chip.facile { background: color-mix(in srgb, var(--ok) 18%, transparent); }
.chip.moyen { background: color-mix(in srgb, var(--acc) 18%, transparent); }
.chip.difficile { background: color-mix(in srgb, var(--warn) 22%, transparent); }
.chip.expert { background: color-mix(in srgb, var(--ko) 20%, transparent); }
.seg.wrap { flex-wrap: wrap; margin: 4px 0 8px; }
.btn.module { margin: 8px 0; }
.intro h1 { margin-top: 4px; }
.isec { margin: 14px 0; }
.isec h3 { font-size: 13px; text-transform: uppercase; letter-spacing: .04em; color: var(--acc); margin: 0 0 4px; }
.isec p { margin: 0; white-space: pre-wrap; }
.isec dl { margin: 0; display: grid; gap: 6px; }
.isec dt { font-weight: 700; }
.isec dd { margin: 0 0 4px; color: var(--mute); font-size: 15px; }
.intro .actions { position: static; }
.dom { display: grid; gap: 0; }
.dname { all: unset; cursor: pointer; font-size: 12px; color: var(--mute); padding-left: 42px; margin-top: -2px; }
.domcard h2 { font-size: 19px; margin: 6px 0; }
.domcard p { margin: 6px 0; }
.domcard .actions { position: static; }
.seg.wrap button { padding: 8px 9px; }
.feedback.lesson { padding: 12px 14px; }
.verdict-line { font-weight: 800; margin-bottom: 6px; }
.feedback.ok .verdict-line { color: var(--ok); } .feedback.ko .verdict-line { color: var(--ko); }
.lpart { margin: 10px 0; }
.lpart h3 { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--acc); margin: 0 0 3px; }
.lpart p { margin: 0; }
.lpart ol { margin: 0; padding-left: 20px; display: grid; gap: 3px; }
.memo { margin-top: 10px; padding: 8px 10px; border-radius: 8px; background: var(--card); border: 1px dashed var(--acc); }
.feedback details { margin-top: 10px; font-size: 13px; color: var(--mute); }
.feedback summary { cursor: pointer; }