:root{--blue:#063b78;--blue2:#075fb9;--yellow:#f2bf00;--bg:#f3f6fa;--card:#fff;--ink:#132033;--muted:#64748b;--ok:#178a43;--bad:#c62828;--line:#d9e1ea;--shadow:0 10px 35px rgba(7,45,91,.10)}*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink)}button,input,select{font:inherit}.shell{min-height:100vh}.topbar{height:70px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:16px;padding:0 22px;position:sticky;top:0;z-index:20}.brand{display:flex;align-items:center;gap:11px;font-weight:900;color:var(--blue);font-size:20px}.brandmark{width:38px;height:38px;border-radius:9px;background:linear-gradient(135deg,var(--yellow),#ffd94d);display:grid;place-items:center;color:var(--blue);font-weight:1000}.spacer{flex:1}.pill{border:1px solid var(--line);border-radius:999px;padding:8px 12px;background:#fff}.premium{background:#fff8d6;border-color:#f0cd40}.btn{border:0;border-radius:12px;padding:12px 17px;font-weight:800;cursor:pointer}.btn-primary{background:var(--blue2);color:#fff}.btn-yellow{background:var(--yellow);color:#1e2e43}.btn-ghost{background:#fff;border:1px solid var(--line);color:var(--blue)}.main{max-width:1180px;margin:0 auto;padding:26px}.hero{background:linear-gradient(135deg,#063b78,#0a68c8);color:#fff;border-radius:24px;padding:30px;display:grid;grid-template-columns:1.5fr .9fr;gap:24px;box-shadow:var(--shadow)}.hero h1{font-size:clamp(30px,4vw,52px);margin:4px 0 10px;line-height:1.02}.hero p{font-size:18px;max-width:720px;opacity:.92}.notice{font-size:13px;opacity:.8}.hero-card{background:rgba(255,255,255,.11);border:1px solid rgba(255,255,255,.2);border-radius:20px;padding:20px}.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:24px}.permit{background:#fff;border:1px solid var(--line);border-radius:17px;padding:17px;cursor:pointer;box-shadow:0 3px 15px rgba(5,40,80,.05)}.permit:hover{border-color:#87b8ea;transform:translateY(-1px)}.permit strong{color:var(--blue);font-size:19px}.small{font-size:13px;color:var(--muted)}.auth-wrap{max-width:460px;margin:6vh auto;padding:20px}.card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px;box-shadow:var(--shadow)}.field{display:flex;flex-direction:column;gap:7px;margin:13px 0}.field input,.field select{border:1px solid #cad5e1;border-radius:11px;padding:13px;background:#fff}.tabs{display:flex;gap:8px;margin-bottom:18px}.tabs button{flex:1}.exam-shell{max-width:1280px;margin:18px auto;padding:0 14px}.exam-top{background:#fff;border:1px solid var(--line);border-radius:14px 14px 0 0;padding:12px 18px;display:flex;align-items:center;gap:16px}.exam-top .timer{margin-left:auto;color:var(--blue);font-weight:900}.exam-body{background:#fff;border:1px solid var(--line);border-top:0;display:grid;grid-template-columns:minmax(300px,42%) 1fr;min-height:520px}.question-image-wrap{background:#f6f8fb;border-right:1px solid var(--line);padding:22px;display:grid;place-items:center}.question-image{width:100%;max-height:430px;object-fit:contain;border:1px solid #dce4ed;border-radius:12px;background:#fff}.question-pane{padding:28px}.qnum{font-size:44px;color:var(--blue2);font-weight:1000;line-height:1}.qtext{font-size:22px;font-weight:800;line-height:1.3;margin:0 0 22px}.option{display:flex;gap:14px;align-items:flex-start;padding:15px;border:1px solid var(--line);border-radius:13px;margin:10px 0;cursor:pointer;background:#fff}.option:hover{border-color:#7fb4e7}.option.selected{border-color:var(--yellow);box-shadow:0 0 0 2px rgba(242,191,0,.25)}.letter{width:34px;height:34px;border-radius:50%;background:#eef3f8;display:grid;place-items:center;font-weight:900;color:var(--blue)}.exam-actions{background:#fff;border:1px solid var(--line);border-top:0;padding:16px;display:flex;gap:12px;justify-content:center}.nav-grid{background:#fff;border:1px solid var(--line);border-top:0;border-radius:0 0 14px 14px;padding:16px;display:grid;grid-template-columns:repeat(15,1fr);gap:8px}.navq{padding:10px 0;border:1px solid var(--line);background:#f8fafc;border-radius:8px;font-weight:800;color:#2863a1}.navq.answered{background:#e8f5ec;border-color:#a9d5b7}.navq.current{outline:2px solid var(--blue2)}.ad{margin:18px auto;max-width:1000px;min-height:90px;border:1px dashed #bac6d3;border-radius:12px;display:grid;place-items:center;color:#7b8794;background:#fff;font-size:13px}.hidden{display:none!important}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:22px 0}.stat{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}.stat b{font-size:28px;color:var(--blue)}.result-ok{color:var(--ok)}.result-bad{color:var(--bad)}.review{margin-top:14px;padding:14px;border:1px solid var(--line);border-radius:12px}.footer{text-align:center;color:var(--muted);padding:40px 20px;font-size:13px}@media(max-width:900px){.grid{grid-template-columns:repeat(2,1fr)}.hero{grid-template-columns:1fr}.exam-body{grid-template-columns:1fr}.question-image-wrap{border-right:0;border-bottom:1px solid var(--line);padding:12px}.question-image{max-height:260px}.question-pane{padding:18px}.qtext{font-size:19px}.nav-grid{grid-template-columns:repeat(6,1fr)}.stats{grid-template-columns:repeat(2,1fr)}.topbar{padding:0 12px}.brand{font-size:16px}.main{padding:15px}}@media(max-width:520px){.grid{grid-template-columns:1fr}.hero{padding:22px}.topbar .hide-mobile{display:none}.exam-actions{position:sticky;bottom:0;z-index:15}.nav-grid{grid-template-columns:repeat(5,1fr)}.question-image{max-height:220px}.qnum{font-size:34px}.option{padding:12px}.stats{grid-template-columns:1fr 1fr}}.image-meta{margin-top:8px;font-size:12px;color:var(--muted);text-align:left}.option{width:100%;text-align:left;font:inherit}.permit{text-align:left}.notice{letter-spacing:.06em}.question-image-wrap{align-content:center}