:root{--bg:#f4f7fb;--card:#fff;--ink:#172033;--muted:#667085;--line:#e4e9f2;--primary:#1f5eff;--primary2:#1246c7;--good:#0f9f6e;--warn:#e69b14;--bad:#d92d20;--dark:#0f172a;--shadow:0 12px 34px rgba(16,24,40,.08)}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink)}a{color:inherit}.hidden{display:none!important}.topbar{height:72px;background:var(--dark);color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 26px;position:sticky;top:0;z-index:20;box-shadow:0 2px 15px rgba(0,0,0,.12)}.brand{display:flex;align-items:center;gap:12px}.logo{width:42px;height:42px;border-radius:12px;background:linear-gradient(135deg,#3b82f6,#1d4ed8);display:grid;place-items:center;font-weight:900;font-size:19px}.brand h1{font-size:16px;margin:0}.brand p{font-size:12px;margin:2px 0 0;color:#b9c3d7}.container{max-width:1320px;margin:0 auto;padding:24px}.grid{display:grid;gap:18px}.stats{grid-template-columns:repeat(4,minmax(0,1fr));margin-bottom:20px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:20px}.stat .label{font-size:13px;color:var(--muted)}.stat .value{font-size:30px;font-weight:800;margin-top:6px}.stat .hint{font-size:12px;color:var(--muted);margin-top:5px}.section-title{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:15px}.section-title h2{margin:0;font-size:18px}.section-title p{margin:4px 0 0;color:var(--muted);font-size:13px}.two-col{grid-template-columns:1.2fr .8fr}.three-col{grid-template-columns:repeat(3,minmax(0,1fr))}label{display:block;font-size:13px;font-weight:650;margin:0 0 6px}.field{margin-bottom:13px}input,select,textarea{width:100%;padding:11px 12px;border:1px solid #d7deea;border-radius:11px;background:#fff;color:var(--ink);outline:none;font:inherit}input:focus,select:focus,textarea:focus{border-color:#7aa2ff;box-shadow:0 0 0 3px rgba(31,94,255,.09)}button,.btn{appearance:none;border:0;border-radius:11px;padding:10px 15px;font-weight:750;cursor:pointer;background:#eef2f8;color:#25324b;font:inherit}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary2)}.btn-good{background:#e8f8f1;color:#087852}.btn-bad{background:#fff0ef;color:#b42318}.btn-warn{background:#fff7e7;color:#9a6700}.btn-dark{background:var(--dark);color:#fff}.btn-sm{padding:7px 10px;font-size:12px}.btn:disabled,button:disabled{opacity:.55;cursor:not-allowed}.row{display:flex;gap:10px;align-items:center}.wrap{flex-wrap:wrap}.grow{flex:1}.badge{display:inline-flex;align-items:center;border-radius:999px;padding:5px 9px;font-size:12px;font-weight:750;background:#eef2f8;color:#475467}.badge.good{background:#e7f8f1;color:#087852}.badge.bad{background:#fff0ef;color:#b42318}.badge.warn{background:#fff7e7;color:#9a6700}.badge.blue{background:#edf4ff;color:#175cd3}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:13px}table{width:100%;border-collapse:collapse;min-width:780px;background:#fff}th,td{text-align:left;padding:11px 12px;border-bottom:1px solid #edf0f5;font-size:13px;vertical-align:middle}th{background:#f8fafc;color:#475467;font-size:12px;text-transform:uppercase;letter-spacing:.03em;position:sticky;top:0}tr:last-child td{border-bottom:0}.muted{color:var(--muted)}.small{font-size:12px}.notice{padding:12px 14px;border-radius:12px;background:#eef4ff;color:#164c96;font-size:13px;margin-bottom:14px}.notice.warn{background:#fff7e7;color:#8a5b00}.notice.good{background:#eaf9f2;color:#087852}.notice.bad{background:#fff0ef;color:#b42318}.login-shell{min-height:100vh;display:grid;grid-template-columns:1.05fr .95fr}.login-hero{background:radial-gradient(circle at 20% 20%,#2d6cff 0,#173f9f 35%,#0f172a 78%);color:#fff;padding:60px;display:flex;flex-direction:column;justify-content:center}.login-hero h1{font-size:48px;line-height:1.05;margin:18px 0}.login-hero p{max-width:600px;color:#d8e2f8;font-size:18px;line-height:1.6}.hero-kicker{font-size:13px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:#a9c5ff}.feature-list{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:28px}.feature{padding:14px;border:1px solid rgba(255,255,255,.18);border-radius:14px;background:rgba(255,255,255,.06);font-size:13px}.login-side{display:grid;place-items:center;padding:34px}.login-card{width:min(440px,100%);background:#fff;border-radius:22px;padding:28px;box-shadow:var(--shadow);border:1px solid var(--line)}.login-card h2{margin:0 0 6px}.divider{height:1px;background:var(--line);margin:18px 0}.session-live{border:2px solid #a8c3ff;background:linear-gradient(180deg,#fff,#f5f8ff)}.countdown{font-variant-numeric:tabular-nums;font-size:31px;font-weight:900;color:#1749c6}.linkbox{display:flex;gap:8px}.linkbox input{font-size:12px}.progress{height:10px;background:#edf0f5;border-radius:99px;overflow:hidden}.progress>div{height:100%;background:var(--primary);border-radius:99px}.pct-big{font-size:50px;font-weight:900;letter-spacing:-.04em}.student-hero{display:grid;grid-template-columns:1.2fr .8fr;gap:18px;margin-bottom:18px}.student-mark{padding:25px;background:linear-gradient(135deg,#0f172a,#173d91);color:#fff;border-radius:20px;box-shadow:var(--shadow)}.student-mark p{color:#d7e2f9}.clock{font-variant-numeric:tabular-nums;font-weight:750}.footer-note{color:var(--muted);font-size:12px;padding:18px 0 5px;text-align:center}.modal{position:fixed;inset:0;background:rgba(15,23,42,.48);z-index:50;display:grid;place-items:center;padding:20px}.modal-card{background:#fff;border-radius:18px;padding:22px;width:min(480px,100%);box-shadow:0 28px 80px rgba(15,23,42,.25)}.toast{position:fixed;right:20px;bottom:20px;z-index:99;max-width:380px;padding:13px 16px;border-radius:12px;background:#111827;color:#fff;box-shadow:var(--shadow);font-size:13px}.toast.bad{background:#b42318}.toast.good{background:#087852}@media(max-width:1000px){.stats{grid-template-columns:repeat(2,1fr)}.two-col,.student-hero{grid-template-columns:1fr}.login-shell{grid-template-columns:1fr}.login-hero{display:none}}@media(max-width:640px){.container{padding:14px}.topbar{padding:0 14px}.brand h1{font-size:13px}.brand p{display:none}.stats{grid-template-columns:1fr 1fr;gap:10px}.card{padding:15px}.feature-list,.three-col{grid-template-columns:1fr}.row.mobile-stack{align-items:stretch;flex-direction:column}.pct-big{font-size:40px}}
