/* ============================================================
   Khan SAT-1600 · Практикум ACCA (v155)
   Author: Xudoyorxon Bunyodov / Худоёрхон Бунёдов
   ============================================================ */
.ac { --a-g:#1B5E20; --a-b:#1565C0; --a-gold:#C9A227; --a-red:#C62828;
  --a-sans:"Segoe UI",Roboto,Arial,system-ui,sans-serif; --a-mono:"JetBrains Mono",Menlo,Consolas,monospace;
  max-width:1280px; margin:0 auto; padding:2px 0 44px; font-family:var(--a-sans); }
.ac *,.ac *::before,.ac *::after { box-sizing:border-box; }
.ac-top { display:flex; align-items:center; gap:12px; flex-wrap:wrap; margin-bottom:14px; }
.ac-top h1 { margin:0; font-size:23px; color:inherit; }
.ac-back { color:var(--a-g); font-weight:600; text-decoration:none; }
html[data-theme="dark"] .ac-back { color:#A5D6A7; }
.ac-badge { background:#eef5ee; color:var(--a-g); border-radius:10px; padding:3px 11px; font-size:12.5px; font-weight:700; }
.ac-hero { background:#fff; color:#1a1a1a; border:1.5px solid #dfe6df; border-radius:20px; padding:24px 28px; margin-bottom:16px; }
.ac-kicker { color:var(--a-g); font-weight:700; font-size:13.5px; }
.ac-hero h1 { font-size:27px; margin:5px 0 10px; }
.ac-hero p { color:#3c463d; line-height:1.6; margin:0 0 14px; font-size:15px; max-width:820px; }
.ac-stats { display:flex; gap:10px; flex-wrap:wrap; }
.ac-stats span { display:flex; flex-direction:column; background:#f2f7f2; border-radius:12px; padding:8px 14px; font-size:12.5px; color:#4a574c; }
.ac-stats b { font-size:19px; color:var(--a-g); }
.ac-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(290px,1fr)); gap:13px; margin-bottom:14px; }
.ac-grid2 { display:grid; grid-template-columns:repeat(auto-fit,minmax(330px,1fr)); gap:13px; margin-bottom:14px; }
.ac-two { display:grid; grid-template-columns:1fr 1fr; gap:14px; margin-bottom:14px; }
.ac-card { background:#fff; color:#1a1a1a; border:1.5px solid #dfe6df; border-radius:16px; padding:16px 18px; }
.ac-card h3 { margin:0 0 10px; font-size:15px; }
.ac-card h3 small { color:#7b877c; font-weight:600; font-size:12.5px; }
.ac-link { display:flex; flex-direction:column; gap:6px; text-decoration:none; transition:border-color .15s, transform .15s; }
.ac-link:hover { border-color:var(--a-g); transform:translateY(-2px); }
.ac-link b { font-size:16px; }
.ac-link span { font-size:13.5px; color:#4a574c; line-height:1.5; }
.ac-p { font-size:14px; line-height:1.6; color:#37453a; margin:0; }
.ac-steps { margin:0; padding-left:20px; }
.ac-steps li { font-size:14px; line-height:1.6; margin-bottom:8px; color:#37453a; }
.ac-msg { background:#f4f7f4; border-radius:10px; padding:10px 14px; font-size:13.5px; line-height:1.55; color:#3c463d; margin-top:10px; }
.ac-msg.ok { background:#f1f8f1; color:#1f5c22; }
.ac-msg.bad { background:#fdf3f2; color:#b3261e; }
.ac-msg.hint { background:#fff8e1; color:#7a5c00; }
.ac-msg a { color:var(--a-g); font-weight:600; }
.ac-btn { border:1.5px solid #cfd8cf; background:#fff; color:#1a1a1a !important; border-radius:10px; padding:7px 13px; font:600 13px var(--a-sans); cursor:pointer; }
.ac-btn:hover { border-color:var(--a-g); background:#f2f7f2; }
.ac-btn-p { background:var(--a-g); border-color:var(--a-g); color:#fff !important; }
.ac-f { display:flex; flex-direction:column; gap:5px; margin-bottom:10px; font-size:12.5px; font-weight:600; color:#45514a; }
.ac-f input { border:1.5px solid #cfd8cf; border-radius:9px; padding:8px 10px; font:14px var(--a-sans); color:#1a1a1a; background:#fff; }
.ac-fact { display:flex; justify-content:space-between; gap:10px; font-size:13.5px; border-bottom:1px dashed #eef1ee; padding:5px 0; }
.ac-fact span { color:#5b675c; }
.ac-fact b { color:#1a1a1a; text-align:right; }
.ac-fact b.ok { color:#1f5c22; } .ac-fact b.bad { color:#b3261e; }
.ac-facts { margin-top:10px; }
.ac-table { width:100%; border-collapse:collapse; font-size:13.5px; }
.ac-table th,.ac-table td { border-bottom:1px solid #eef1ee; padding:7px 9px; text-align:left; vertical-align:top; }
.ac-table th { background:#f6f8f6; font-weight:700; }
.ac-table td.mono { font-family:var(--a-mono); font-size:12.5px; }
.ac-area { width:100%; min-height:220px; border:1.5px solid #cfd8cf; border-radius:10px; padding:10px 12px; font:14px/1.55 var(--a-sans); color:#1a1a1a; background:#fff; resize:vertical; }
.ac-check-item { display:flex; gap:9px; align-items:flex-start; font-size:13.5px; line-height:1.5; padding:5px 0; color:#37453a; cursor:pointer; }
.ac-check-item input { margin-top:3px; width:17px; height:17px; accent-color:#1B5E20; }
.ac-breath { background:#0F2417; color:#e8f0e9; border-radius:12px; padding:26px; text-align:center; font-size:18px; font-weight:600; margin-bottom:10px; transition:background .4s; }
.ac-breath.in { background:#14532d; } .ac-breath.hold { background:#1f3a5f; } .ac-breath.out { background:#4a3b12; }
.ac-tabs2 { display:flex; gap:8px; flex-wrap:wrap; margin-bottom:12px; }
.ac-tabs2 button { border:1.5px solid #cfd8cf; background:#fff; color:#1a1a1a; border-radius:20px; padding:7px 15px; font:600 13px var(--a-sans); cursor:pointer; }
.ac-tabs2 button.on { border-color:var(--a-g); background:#eef5ee; color:var(--a-g); }
.ac-search { width:100%; border:1.5px solid #cfd8cf; border-radius:10px; padding:9px 12px; font:14px var(--a-sans); margin-bottom:10px; color:#1a1a1a; background:#fff; }
.ac-list { display:flex; flex-direction:column; max-height:460px; overflow:auto; }
.ac-row { display:grid; grid-template-columns:130px 1fr; gap:12px; padding:8px 6px; border-bottom:1px solid #f0f3f0; font-size:13.5px; text-decoration:none; color:#1a1a1a; }
.ac-row:hover { background:#f6faf6; }
.ac-row b { color:var(--a-g); }

/* экран CBE */
.ac-cbe { border:1.5px solid #b9c3bb; border-radius:14px; overflow:hidden; background:#fff; }
.ac-cbe-bar { display:flex; align-items:center; gap:10px; flex-wrap:wrap; background:#1f3a5f; color:#fff; padding:9px 12px; font-size:13px; }
.ac-cbe-bar .ac-btn { background:rgba(255,255,255,.12); border-color:rgba(255,255,255,.35); color:#fff !important; }
.ac-q { font-weight:700; }
.ac-flag { border:1.5px solid rgba(255,255,255,.4); background:transparent; color:#fff; border-radius:9px; padding:5px 11px; font:600 12.5px var(--a-sans); cursor:pointer; }
.ac-flag.on { background:var(--a-gold); border-color:var(--a-gold); color:#1a1a1a; }
.ac-timer { margin-left:auto; font-variant-numeric:tabular-nums; font-size:16px; font-weight:700; }
.ac-timer.over { color:#ff8a80; }
.ac-limit { font-size:12px; opacity:.8; }
.ac-cbe-body { display:grid; grid-template-columns:minmax(280px,1fr) minmax(420px,1.3fr); gap:0; }
.ac-task { padding:14px 16px; border-right:1px solid #e4e9e4; }
.ac-task b { font-size:15px; display:block; margin-bottom:6px; }
.ac-task p { font-size:14px; line-height:1.6; color:#37453a; margin:0 0 10px; }
.ac-tabs { display:flex; gap:6px; flex-wrap:wrap; margin-bottom:10px; }
.ac-tab { width:32px; height:32px; border:1.5px solid #cfd8cf; background:#fff; border-radius:8px; font-weight:700; cursor:pointer; color:#1a1a1a; }
.ac-tab.on { background:#1f3a5f; border-color:#1f3a5f; color:#fff; }
.ac-sheet-wrap { padding:10px 12px; background:#f7f9f7; overflow:auto; }
.ac-formula { display:flex; gap:8px; align-items:center; margin-bottom:8px; }
.ac-formula span { min-width:44px; font-weight:700; font-family:var(--a-mono); background:#fff; border:1.5px solid #cfd8cf; border-radius:8px; padding:6px 8px; text-align:center; }
.ac-formula input { flex:1; border:1.5px solid #cfd8cf; border-radius:8px; padding:7px 10px; font:13.5px var(--a-mono); background:#fff; color:#1a1a1a; }
.ac-sheet { border-collapse:collapse; width:100%; background:#fff; font-size:13px; }
.ac-sheet th { background:#eef1ee; border:1px solid #d4dbd5; font-weight:600; font-size:12px; padding:3px 6px; color:#5b675c; }
.ac-sheet td { border:1px solid #dde3de; padding:4px 7px; min-width:74px; height:26px; cursor:cell; color:#1a1a1a; }
.ac-sheet td.num { text-align:right; font-variant-numeric:tabular-nums; }
.ac-sheet td.on { outline:2px solid #1f3a5f; outline-offset:-2px; background:#eaf1fb; }
.ac-cbe-foot { display:flex; gap:8px; align-items:center; padding:10px 12px; border-top:1px solid #e4e9e4; background:#fbfcfb; }
.ac-spacer { flex:1; }
.ac-check { display:flex; gap:8px; align-items:baseline; font-size:13px; padding:5px 0; }
.ac-check i { font-style:normal; }
.ac-check.ok { color:#1f5c22; } .ac-check.bad { color:#b3261e; }
.topnav a.ac-navlink { font-weight:700; }
html[data-theme="dark"] .ac .ac-card, html[data-theme="dark"] .ac .ac-hero { background:#fff; color:#1a1a1a; }
@media (max-width:1000px){ .ac-two,.ac-cbe-body { grid-template-columns:1fr; } .ac-task { border-right:0; border-bottom:1px solid #e4e9e4; } }