:root{
  --bg:#07111f;--surface:#0d1b2c;--surface-2:#13243a;--surface-3:#19304a;
  --ink:#eef7ff;--muted:#9fb3c8;--line:rgba(174,208,230,.18);--line-strong:rgba(174,208,230,.34);
  --cyan:#f6c453;--blue:#38bdf8;--green:#34d399;--amber:#fbbf24;--red:#fb7185;
  --shadow:0 20px 55px rgba(0,0,0,.26);--radius:20px;
}
:root[data-theme="light"]{
  --bg:#edf5f8;--surface:#fff;--surface-2:#f4f9fb;--surface-3:#e9f3f6;
  --ink:#102235;--muted:#526a7d;--line:rgba(30,77,102,.14);--line-strong:rgba(30,77,102,.28);
  --shadow:0 18px 45px rgba(28,66,83,.12);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;min-height:100vh;background:
  radial-gradient(circle at 8% 0,rgba(246,196,83,.12),transparent 34rem),
  radial-gradient(circle at 95% 18%,rgba(52,211,153,.08),transparent 30rem),var(--bg);
  color:var(--ink);font-family:"Bricolage Grotesque",system-ui,-apple-system,sans-serif;line-height:1.55}
a{color:inherit}
button,input,select{font:inherit}
button{cursor:pointer}
.page-shell{width:min(1180px,calc(100% - 32px));margin:0 auto;padding:18px 0 92px}
.page-top{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 0 22px}
.back-link{display:inline-flex;align-items:center;gap:8px;color:var(--muted);text-decoration:none;font-weight:700}
.back-link:hover{color:var(--ink)}
.top-tools{display:flex;align-items:center;gap:9px}
.icon-btn{width:42px;height:42px;border:1px solid var(--line);border-radius:13px;background:var(--surface);color:var(--ink)}
.page-hero{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:26px;align-items:end;margin-bottom:24px}
.eyebrow{display:inline-flex;padding:6px 10px;border-radius:999px;background:rgba(246,196,83,.1);color:var(--cyan);
  font:700 11px/1.2 "JetBrains Mono",monospace;letter-spacing:.09em;text-transform:uppercase}
h1{font-size:clamp(34px,6vw,68px);line-height:.96;letter-spacing:-.055em;margin:15px 0 12px;max-width:900px}
.lead{max-width:790px;color:var(--muted);font-size:clamp(16px,2vw,19px);margin:0}
.hero-mark{font:800 clamp(38px,8vw,86px)/1 "JetBrains Mono",monospace;color:rgba(246,196,83,.16);letter-spacing:-.09em}
.notice{display:flex;gap:13px;padding:16px 18px;margin:20px 0;border:1px solid rgba(251,191,36,.32);
  border-radius:16px;background:rgba(251,191,36,.07);color:var(--muted)}
.notice b{color:var(--ink)}
.notice.danger{border-color:rgba(251,113,133,.35);background:rgba(251,113,133,.07)}
.notice.ok{border-color:rgba(52,211,153,.3);background:rgba(52,211,153,.07)}
.grid{display:grid;gap:16px}
.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.card{border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(155deg,var(--surface),var(--surface-2));
  box-shadow:var(--shadow);padding:22px}
.card h2,.card h3{margin:0 0 9px;letter-spacing:-.025em}
.card p{color:var(--muted)}
.stat{display:flex;flex-direction:column;gap:4px}
.stat b{font:800 28px/1 "JetBrains Mono",monospace;color:var(--cyan)}
.stat span{color:var(--muted);font-size:13px}
.toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin:18px 0}
.search{flex:1;min-width:230px;display:flex;align-items:center;gap:9px;padding:11px 14px;border:1px solid var(--line);
  border-radius:13px;background:var(--surface)}
.search input{width:100%;border:0;outline:0;background:transparent;color:var(--ink)}
.search input::placeholder{color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--muted);padding:8px 12px;font-weight:700;font-size:13px}
.chip[aria-pressed="true"],.chip:hover{border-color:var(--cyan);background:rgba(246,196,83,.1);color:var(--ink)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--line-strong);border-radius:13px;
  background:var(--surface-2);color:var(--ink);padding:11px 16px;text-decoration:none;font-weight:800}
.btn:hover{transform:translateY(-1px);border-color:var(--cyan)}
.btn.primary{border-color:transparent;background:linear-gradient(135deg,#06b6d4,#22c55e);color:#04121b}
.btn.danger{border-color:rgba(251,113,133,.4);color:#fecdd3}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.mono{font-family:"JetBrains Mono",monospace}
.muted{color:var(--muted)}
.hide{display:none!important}
.empty{padding:36px;text-align:center;color:var(--muted);border:1px dashed var(--line-strong);border-radius:18px}
.item-list{display:grid;gap:12px}
.item{border:1px solid var(--line);border-radius:17px;background:var(--surface);overflow:hidden}
.item-head{display:flex;align-items:flex-start;justify-content:space-between;gap:15px;width:100%;padding:18px;border:0;background:transparent;color:var(--ink);text-align:left}
.item-head h3{margin:0 0 4px;font-size:18px}
.item-head p{margin:0;color:var(--muted)}
.item-body{padding:0 18px 20px;border-top:1px solid var(--line)}
.badge{display:inline-flex;align-items:center;padding:4px 8px;border:1px solid var(--line);border-radius:999px;color:var(--muted);
  font:700 10px/1.2 "JetBrains Mono",monospace;letter-spacing:.06em;text-transform:uppercase}
.tag-row{display:flex;flex-wrap:wrap;gap:7px;margin-top:10px}
.code{display:block;overflow:auto;margin:10px 0;padding:13px 14px;border:1px solid var(--line);border-radius:12px;
  background:#04101c;color:#c8f7ff;font:600 13px/1.55 "JetBrains Mono",monospace;white-space:pre-wrap}
:root[data-theme="light"] .code{background:#102235;color:#e8f8ff}
.progress{height:9px;overflow:hidden;border-radius:99px;background:var(--surface-3)}
.progress i{display:block;height:100%;width:var(--p,0%);border-radius:inherit;background:linear-gradient(90deg,var(--cyan),var(--green))}
.question{padding:24px;border:1px solid var(--line);border-radius:22px;background:var(--surface);box-shadow:var(--shadow)}
.q-meta{display:flex;justify-content:space-between;gap:10px;color:var(--muted);font:700 12px/1.4 "JetBrains Mono",monospace}
.question h2{font-size:clamp(21px,3vw,29px);line-height:1.25;margin:20px 0}
.answers{display:grid;gap:10px}
.answer{display:grid;grid-template-columns:34px 1fr;gap:12px;align-items:center;width:100%;padding:13px 14px;border:1px solid var(--line);
  border-radius:14px;background:var(--surface-2);color:var(--ink);text-align:left}
.answer:hover,.answer.selected{border-color:var(--cyan);background:rgba(246,196,83,.08)}
.letter{display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:var(--surface-3);font:800 12px "JetBrains Mono",monospace}
.exam-bar{position:sticky;top:10px;z-index:4;display:flex;align-items:center;justify-content:space-between;gap:14px;margin:12px 0 18px;
  padding:12px 15px;border:1px solid var(--line);border-radius:16px;background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(16px)}
.timer{font:800 18px "JetBrains Mono",monospace;color:var(--cyan)}
.result-score{font:900 clamp(48px,9vw,100px)/1 "JetBrains Mono",monospace;letter-spacing:-.08em;color:var(--cyan)}
.result-score.fail{color:var(--red)}
.breakdown{display:grid;gap:10px;margin-top:18px}
.break-row{display:grid;grid-template-columns:minmax(130px,1fr) 2fr 70px;gap:12px;align-items:center;font-size:13px}
.review{margin-top:12px;padding:16px;border:1px solid var(--line);border-radius:15px;background:var(--surface-2)}
.review.good{border-color:rgba(52,211,153,.26)}
.review.bad{border-color:rgba(251,113,133,.3)}
.calc-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:11px}
.field{display:grid;gap:6px}
.field label{color:var(--muted);font-size:12px;font-weight:700}
.field input,.field select{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:11px;background:var(--surface-2);color:var(--ink)}
.calc-output{margin-top:14px;padding:16px;border-radius:14px;background:rgba(246,196,83,.08);border:1px solid rgba(246,196,83,.24)}
.calc-output b{font:800 25px "JetBrains Mono",monospace;color:var(--cyan)}
.term-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.term{padding:18px;border:1px solid var(--line);border-radius:17px;background:var(--surface)}
.term h3{margin:5px 0 5px;font-size:20px}
.term .expansion{color:var(--cyan);font:600 12px "JetBrains Mono",monospace}
.term p{margin:8px 0;color:var(--muted)}
.flash-wrap{display:grid;place-items:center;min-height:430px}
.flash{width:min(720px,100%);min-height:330px;padding:34px;border:1px solid var(--line-strong);border-radius:28px;
  background:linear-gradient(145deg,var(--surface),var(--surface-2));box-shadow:var(--shadow);display:grid;place-items:center;text-align:center}
.flash .front{font-size:clamp(27px,5vw,50px);line-height:1.1;font-weight:800;letter-spacing:-.045em}
.flash .back{font-size:clamp(17px,2.4vw,23px);color:var(--muted)}
.flash-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin-top:16px}
.task-card{padding:19px;border:1px solid var(--line);border-radius:18px;background:var(--surface)}
.task-card h3{margin:10px 0 7px}
.task-card p{margin:0;color:var(--muted)}
.steps{counter-reset:step;display:grid;gap:10px;padding:0}
.steps li{list-style:none;position:relative;padding:13px 14px 13px 48px;border:1px solid var(--line);border-radius:13px;background:var(--surface-2)}
.steps li::before{counter-increment:step;content:counter(step);position:absolute;left:13px;top:12px;display:grid;place-items:center;width:25px;height:25px;
  border-radius:8px;background:rgba(246,196,83,.12);color:var(--cyan);font:800 11px "JetBrains Mono",monospace}
.checklist{display:grid;gap:9px}
.check{display:flex;gap:10px;align-items:flex-start;padding:11px;border:1px solid var(--line);border-radius:12px;background:var(--surface-2)}
.check input{margin-top:4px;accent-color:var(--green)}
.module-progress-list{display:grid;gap:11px}
.module-row{display:grid;grid-template-columns:minmax(180px,1fr) 2fr 80px;align-items:center;gap:14px;padding:13px;border:1px solid var(--line);border-radius:13px;background:var(--surface-2)}
.page-footer{margin-top:38px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}
@media(max-width:780px){
  .page-shell{width:min(100% - 22px,1180px)}
  .page-hero{grid-template-columns:1fr}.hero-mark{display:none}
  .grid.two,.grid.three,.term-grid{grid-template-columns:1fr}
  .calc-grid{grid-template-columns:1fr 1fr}
  .break-row,.module-row{grid-template-columns:1fr}
  .exam-bar{top:5px}.page-top{padding-bottom:14px}
}
@media(max-width:480px){.calc-grid{grid-template-columns:1fr}.card,.question{padding:17px}.page-shell{padding-bottom:72px}}

.track-choice{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0}
.track-choice button{padding:18px;border:1px solid var(--line);border-radius:16px;background:var(--surface-2);
 color:var(--ink);font:inherit;text-align:left;cursor:pointer}.track-choice button[aria-pressed="true"]{border-color:var(--accent);box-shadow:0 0 0 2px color-mix(in srgb,var(--accent) 24%,transparent)}
.exam-option{display:flex;gap:10px;align-items:flex-start;width:100%;padding:13px;margin:8px 0;border:1px solid var(--line);
 border-radius:12px;background:var(--surface-2);color:var(--ink);font:inherit;text-align:left;cursor:pointer}
.exam-option.selected{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,var(--surface-2))}
.exam-letter{display:grid;place-items:center;min-width:27px;height:27px;border-radius:8px;background:var(--surface-3);font-weight:800}
.exam-nav{display:flex;justify-content:space-between;gap:10px;margin-top:18px;flex-wrap:wrap}
.question-map{display:flex;gap:6px;flex-wrap:wrap}.question-map button{width:34px;height:34px;border-radius:9px;border:1px solid var(--line);background:var(--surface-2);color:var(--ink);cursor:pointer}
.question-map button.done{background:color-mix(in srgb,var(--green) 22%,var(--surface-2));border-color:var(--green)}
.score-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.score-box{padding:14px;border:1px solid var(--line);border-radius:13px;background:var(--surface-2)}
.rubric-score{width:90px;padding:10px;border-radius:10px;border:1px solid var(--line);background:var(--surface-2);color:var(--ink)}
.warning-box{border-left:4px solid #f6c453;background:rgba(246,196,83,.08);padding:14px 16px;border-radius:10px;line-height:1.55}
@media(max-width:640px){.track-choice,.score-grid{grid-template-columns:1fr}}