[hidden] { display: none !important; }
:root {
  --bg: #f7f5f0; --card: #ffffff; --text: #1f2328; --muted: #6b7078; --line: #e3e0d8;
  --green: #1b7f4b; --green-bg: #e3f4ea; --red: #c0392b; --red-bg: #fbe7e4;
  --accent: #1b7f4b; --accent-2: #b8322a; --amber: #b7791f; --amber-bg: #fdf3dc;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 4px 14px rgba(0,0,0,.05);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a; --card: #1e2125; --text: #e8e8e6; --muted: #9aa0a6; --line: #30343a;
    --green: #4cc68a; --green-bg: #173326; --red: #ff7b6e; --red-bg: #3a1d1a;
    --accent: #4cc68a; --accent-2: #ff7b6e; --amber: #f0b44c; --amber-bg: #3a2e14;
    --shadow: none;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.5 system-ui, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 20px; background: var(--card); border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 18px; text-decoration: none; color: var(--text); display: flex; align-items: center; gap: 8px; }
.flag { display: inline-flex; width: 24px; height: 16px; border-radius: 2px; overflow: hidden; }
.flag i { flex: 1; } .flag i:nth-child(1){background:#009246} .flag i:nth-child(2){background:#fff} .flag i:nth-child(3){background:#ce2b37}
nav { display: flex; gap: 16px; flex-wrap: wrap; } nav a { text-decoration: none; color: var(--muted); font-weight: 500; } nav a:hover { color: var(--text); }
main { max-width: 1100px; margin: 0 auto; padding: 24px 16px 80px; }
h1 { font-size: 26px; margin: 0 0 4px; } h2 { font-size: 19px; margin: 28px 0 12px; }
.muted { color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px; box-shadow: var(--shadow); }
.warning { background: var(--amber-bg); color: var(--text); border-bottom: 1px solid var(--line); padding: 10px 20px; font-size: 14px; }
.btn { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line); background: var(--card); color: var(--text); padding: 9px 16px; border-radius: 8px; font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; }
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
@media (prefers-color-scheme: dark) { .btn.primary { color: #0d1a12; } }
.btn.small { padding: 5px 10px; font-size: 14px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* home */
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin: 18px 0; }
.kpi .v { font-size: 26px; font-weight: 700; } .kpi .l { color: var(--muted); font-size: 13px; }
.teacher { display: flex; gap: 14px; align-items: flex-start; }
.teacher .face { font-size: 34px; line-height: 1; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: 8px; }
.tile { display: block; text-decoration: none; color: var(--text); background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 10px; text-align: center; }
.tile:hover { border-color: var(--muted); }
.tile .n { font-weight: 700; } .tile .s { font-size: 12px; color: var(--muted); }
.tile.pass { border-color: var(--green); background: var(--green-bg); }
.tile.fail { border-color: var(--red); background: var(--red-bg); }
.weak { display: grid; gap: 10px; }
.weak .card { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }

/* quiz */
.quizhead { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 10px; }
.progress { height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; margin-bottom: 18px; }
.progress div { height: 100%; background: var(--accent); transition: width .25s; }
.badge { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; padding: 3px 8px; border-radius: 6px; background: var(--line); color: var(--text); }
.quiz { display: grid; grid-template-columns: 1fr; gap: 16px; }
.quiz.with-ctx { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
@media (max-width: 820px) { .quiz.with-ctx { grid-template-columns: 1fr; } }
.ctx h3 { margin: 4px 0 10px; font-size: 17px; }
.ctx .text { white-space: pre-wrap; font-size: 16px; line-height: 1.65; }
.prompt { font-size: 20px; font-weight: 600; margin: 6px 0 16px; }
.options { display: grid; gap: 10px; }
.opt { text-align: left; border: 2px solid var(--line); background: var(--card); color: var(--text); border-radius: 10px; padding: 12px 14px; font: inherit; font-size: 17px; cursor: pointer; display: flex; gap: 12px; align-items: center; }
.opt:hover:not(:disabled) { border-color: var(--muted); }
.opt .k { flex: none; width: 26px; height: 26px; border-radius: 6px; background: var(--line); display: grid; place-items: center; font-size: 13px; font-weight: 700; }
.opt:disabled { cursor: default; }
.opt.correct { border-color: var(--green); background: var(--green-bg); }
.opt.wrong { border-color: var(--red); background: var(--red-bg); }
.feedback { margin-top: 14px; border-radius: 10px; padding: 14px; border-left: 5px solid; }
.feedback.ok { background: var(--green-bg); border-color: var(--green); }
.feedback.no { background: var(--red-bg); border-color: var(--red); }
.feedback .title { font-weight: 700; margin-bottom: 4px; }
.feedback .rule { margin-top: 8px; font-style: italic; }
.feedback details { margin-top: 8px; } .feedback summary { cursor: pointer; font-weight: 600; }
.lesson { margin-top: 6px; font-size: 15px; }
.lesson ul { margin: 6px 0; padding-left: 20px; }
.next { margin-top: 16px; display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.player { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin: 10px 0; }
.player select { font: inherit; padding: 6px; border-radius: 6px; border: 1px solid var(--line); background: var(--card); color: var(--text); }
.script p { margin: 4px 0; } .script b { color: var(--muted); font-weight: 600; }
.speaking { outline: 2px solid var(--amber); border-radius: 4px; }

/* results / stats */
.score-big { font-size: 46px; font-weight: 800; }
.pass { color: var(--green); } .fail { color: var(--red); }
.bars { display: grid; gap: 8px; }
.bar { display: grid; grid-template-columns: 220px 1fr 110px; gap: 10px; align-items: center; font-size: 15px; }
@media (max-width: 640px) { .bar { grid-template-columns: 1fr 70px; } .bar .track { grid-column: 1 / -1; grid-row: 2; } }
.track { height: 10px; background: var(--line); border-radius: 5px; overflow: hidden; }
.track div { height: 100%; border-radius: 5px; }
.lvl-good { background: var(--green); } .lvl-mid { background: var(--amber); } .lvl-bad { background: var(--red); }
.mistake { border-top: 1px solid var(--line); padding: 10px 0; }
.mistake:first-child { border-top: 0; }
kbd { font: 12px ui-monospace, monospace; border: 1px solid var(--line); border-radius: 4px; padding: 1px 5px; }
.preview { margin: 6px 0 10px; padding-left: 22px; font-size: 14px; color: var(--muted); }
.preview .cur { color: var(--text); font-weight: 600; }
/* Persian (right-to-left) explanations */
.fa { direction: rtl; text-align: right; unicode-bidi: isolate; font-family: "Vazirmatn", Tahoma, "Segoe UI", sans-serif; font-size: 16px; line-height: 1.9; }
.fa bdi { font-family: system-ui, "Segoe UI", Roboto, sans-serif; }
.lesson .fa + ul { margin-top: 8px; }

/* ---------- mobile ---------- */
html { -webkit-text-size-adjust: 100%; }
body { -webkit-tap-highlight-color: transparent; }
@media (hover: none) {
  .keys { display: none; }
  .btn:hover, .tile:hover, .opt:hover:not(:disabled) { border-color: var(--line); }
}
@media (max-width: 640px) {
  .top { position: sticky; top: 0; z-index: 10; padding: 10px 14px; gap: 6px; }
  .brand { font-size: 17px; }
  nav { width: 100%; justify-content: space-between; gap: 8px; font-size: 15px; }
  main { padding: 14px 12px 40px; }
  h1 { font-size: 21px; } h2 { font-size: 17px; margin: 22px 0 10px; }
  .card { padding: 14px; border-radius: 10px; }
  .teacher { gap: 10px; font-size: 15px; } .teacher .face { font-size: 28px; }
  .kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin: 12px 0; }
  .kpi .v { font-size: 22px; }
  .row > .btn { flex: 1 1 auto; justify-content: center; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(68px, 1fr)); gap: 6px; }
  .tile { padding: 8px 2px; } .tile .n { font-size: 14px; }
  .quizhead { gap: 6px; } .quizhead h1 { font-size: 19px; }
  .prompt { font-size: 18px; margin: 4px 0 12px; }
  .opt { min-height: 52px; padding: 12px; font-size: 17px; }
  /* long reading texts scroll inside their card so the question stays close */
  .ctx .text { max-height: 40vh; overflow-y: auto; padding-right: 4px; }
  .player .btn { flex: 1; justify-content: center; }
  .preview { font-size: 13px; }
  /* "Avanti" always reachable with the thumb */
  .next { position: sticky; bottom: 0; z-index: 5; background: var(--card); margin: 14px -14px -14px; padding: 10px 14px calc(10px + env(safe-area-inset-bottom)); border-top: 1px solid var(--line); border-radius: 0 0 10px 10px; }
  .next #next { flex: 1 1 100%; justify-content: center; padding: 12px; }
  .auto-label { font-size: 13px !important; }
  .score-big { font-size: 34px; }
  .weak .card .btn, .mistake + .btn { width: 100%; justify-content: center; }
  .fa { font-size: 15px; }
}