:root{
  --bg:#f6f7fb; --panel:#ffffff; --ink:#172033; --muted:#667085; --line:#e3e7ef;
  --brand:#3547d6; --brand2:#6d5dfc; --soft:#eef1ff; --ok:#0f8a55; --bad:#c33b3b; --warn:#b66a00;
  --radius:18px; --shadow:0 16px 36px rgba(22,32,60,.09);
}
*{box-sizing:border-box}
body{margin:0;font-family:"Inter","Noto Sans SC","Microsoft YaHei",Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.65}
.hero{background:linear-gradient(135deg,#101938 0%,#2937a4 50%,#7557e8 100%);color:#fff;padding:44px 28px 92px;position:relative;overflow:hidden}
.hero:after{content:"";position:absolute;right:-120px;top:-140px;width:360px;height:360px;border-radius:50%;background:rgba(255,255,255,.12)}
.hero-inner{max-width:1180px;margin:0 auto;position:relative;z-index:1}.eyebrow{letter-spacing:.08em;text-transform:uppercase;font-size:13px;opacity:.82}.hero h1{font-size:42px;line-height:1.15;margin:14px 0 16px}.hero h1 span{color:#dce2ff}.hero p{max-width:760px;font-size:17px;opacity:.92}.hero-actions{display:flex;gap:12px;margin-top:24px}
.layout{max-width:1220px;margin:-58px auto 42px;display:grid;grid-template-columns:230px minmax(0,1fr);gap:24px;padding:0 22px;position:relative;z-index:2}.sidebar{background:rgba(255,255,255,.95);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:var(--radius);padding:18px;align-self:start;position:sticky;top:18px}.brand{font-weight:800;margin:4px 8px 16px;color:var(--brand)}.nav{display:block;width:100%;border:0;background:transparent;text-align:left;padding:11px 12px;border-radius:12px;color:var(--ink);cursor:pointer;font-size:15px}.nav:hover{background:#f1f3fb}.nav.active{background:var(--soft);color:var(--brand);font-weight:700}.content{min-width:0}.view{display:none}.view.active{display:block}.panel,.notice,.question-card{background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:var(--radius);padding:22px;margin-bottom:20px}.notice{border-left:6px solid var(--brand);box-shadow:none}.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-bottom:20px}.card{background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:var(--radius);padding:20px}.card .num{font-size:30px;font-weight:800;color:var(--brand)}.card .label{color:var(--muted);font-size:14px}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:22px}.path{padding-left:22px}.toolbar{display:flex;gap:10px;align-items:center;margin-bottom:16px;flex-wrap:wrap;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:14px}select,input[type="search"],input[type="number"]{border:1px solid var(--line);border-radius:12px;padding:10px 12px;background:#fff;color:var(--ink);font-size:15px}input[type="search"]{min-width:260px;flex:1}.grid-form{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin:14px 0 18px}.grid-form label{display:flex;flex-direction:column;gap:6px;color:var(--muted);font-size:14px}.grid-form select,.grid-form input{width:100%}button{border:0;border-radius:13px;padding:11px 16px;font-weight:700;cursor:pointer;font-size:15px}.primary{background:var(--brand);color:#fff}.primary:hover{filter:brightness(.95)}.secondary{background:#fff;color:var(--brand);border:1px solid rgba(53,71,214,.28)}.danger{background:#fff1f1;color:var(--bad);border:1px solid #ffd0d0}.small{padding:8px 12px;font-size:14px}.question-card{box-shadow:none}.q-head{display:flex;gap:10px;align-items:flex-start;justify-content:space-between}.q-title{font-size:18px;font-weight:800;margin:0 0 10px}.badge{display:inline-flex;align-items:center;border-radius:999px;background:#f1f3fb;color:var(--muted);font-size:12px;padding:3px 9px;margin-right:6px;white-space:nowrap}.badge.single{background:#e9f6ff;color:#1264a3}.badge.multiple{background:#fff3dd;color:#9b5a00}.badge.module{background:var(--soft);color:var(--brand)}.options{display:grid;gap:10px;margin:12px 0}.option{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--line);border-radius:14px;background:#fff;padding:12px;cursor:pointer}.option:hover{border-color:#b9c2ff;background:#fbfcff}.option input{margin-top:5px}.option.correct{border-color:#99d8b7;background:#effaf4}.option.wrong{border-color:#f0aaaa;background:#fff5f5}.answer-box{background:#f8fafc;border:1px dashed #cdd5e4;border-radius:14px;padding:14px;margin-top:12px}.answer-box strong{color:var(--brand)}.hidden{display:none!important}.progress-wrap{background:#e7eaf3;border-radius:999px;overflow:hidden;height:10px;margin:12px 0}.progress-bar{height:100%;background:linear-gradient(90deg,var(--brand),var(--brand2));width:0%}.practice-meta,.exam-meta{display:flex;gap:12px;flex-wrap:wrap;align-items:center;color:var(--muted);margin-bottom:12px}.result-ok{color:var(--ok);font-weight:800}.result-bad{color:var(--bad);font-weight:800}.exam-sticky{position:sticky;top:12px;z-index:5;background:rgba(255,255,255,.95);border:1px solid var(--line);border-radius:var(--radius);padding:12px 16px;box-shadow:var(--shadow);display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.timer{font-weight:800;color:var(--warn)}.module-row{display:grid;grid-template-columns:220px 1fr 80px;gap:12px;align-items:center;margin:10px 0}.bar-bg{height:12px;background:#e8ebf3;border-radius:999px;overflow:hidden}.bar-fill{height:100%;background:linear-gradient(90deg,var(--brand),var(--brand2));width:0}code{background:#eef1f7;border:1px solid var(--line);padding:2px 6px;border-radius:7px}footer{text-align:center;color:var(--muted);padding:20px}
@media(max-width:900px){.layout{grid-template-columns:1fr;margin-top:-44px}.sidebar{position:relative;top:auto;display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.brand{grid-column:1/-1}.cards{grid-template-columns:repeat(2,1fr)}.grid-form{grid-template-columns:repeat(2,1fr)}.two-col{grid-template-columns:1fr}.hero h1{font-size:32px}}
@media(max-width:560px){.cards,.grid-form,.sidebar{grid-template-columns:1fr}.hero{padding-left:18px;padding-right:18px}.layout{padding:0 12px}.hero-actions{flex-direction:column}.module-row{grid-template-columns:1fr}.toolbar{align-items:stretch}.toolbar>*{width:100%;min-width:0!important}}