:root{--bg:#f4f6fa;--card:#fff;--text:#152033;--muted:#6d7789;--line:#e2e7ef;--accent:#2468f2;--accent2:#164fc3;--danger:#b42318;--green:#14804a;--shadow:0 18px 55px rgba(34,48,74,.09);--radius:20px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;line-height:1.5}a{color:inherit}.admin-top{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}.admin-top__in{width:min(1180px,calc(100% - 32px));height:68px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:18px}.brand{text-decoration:none;font-size:23px;font-weight:900;letter-spacing:-.04em}.brand span{color:var(--accent)}.top-actions{display:flex;gap:10px;align-items:center}.top-actions a{font-size:14px;text-decoration:none;padding:9px 12px;border-radius:10px}.top-actions a:hover{background:#eef3ff}.top-actions .logout{color:var(--danger)}.admin-wrap{width:min(1180px,calc(100% - 32px));margin:0 auto;padding:48px 0 70px}.kicker{font-size:12px;text-transform:uppercase;letter-spacing:.12em;font-weight:800;color:var(--accent)}h1{font-size:clamp(34px,5vw,52px);line-height:1.08;letter-spacing:-.035em;margin:10px 0 12px}.lead{margin:0;max-width:780px;color:var(--muted);font-size:17px}.section{margin-top:36px}.section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:14px}.section h2{font-size:24px;margin:0}.section-head p{margin:0;color:var(--muted);font-size:14px}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.course-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}.course-card--ops{border-color:#c8d9ff}.course-card h3{font-size:21px;line-height:1.22;margin:0 0 7px}.course-card p{margin:0 0 17px;color:var(--muted);font-size:14px}.links{display:flex;flex-wrap:wrap;gap:9px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 14px;border-radius:11px;text-decoration:none;font-size:14px;font-weight:750;border:1px solid var(--line);background:#fff}.btn:hover{border-color:#b5c7ed;background:#f6f9ff}.btn.primary{background:var(--accent);border-color:var(--accent);color:white}.btn.primary:hover{background:var(--accent2)}.btn.green{color:var(--green);border-color:#bfe3ce;background:#f2fbf6}.login-page{min-height:100vh;display:grid;place-items:center;padding:24px}.login-wrap{width:min(440px,100%)}.login-card{background:white;border:1px solid var(--line);border-radius:24px;padding:30px;box-shadow:var(--shadow)}.login-card h1{font-size:34px;margin:14px 0 8px}.login-card p{color:var(--muted);margin:0 0 22px}.secure-label{display:inline-flex;margin-top:22px;padding:6px 9px;border-radius:999px;background:#edf4ff;color:#2452a8;font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.06em}.login-form{display:grid;gap:14px}.login-form label{display:grid;gap:6px}.login-form label span{font-size:13px;font-weight:750}.login-form input{width:100%;min-height:48px;border:1px solid #cfd6e1;border-radius:12px;padding:0 13px;font:inherit;outline:none}.login-form input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(36,104,242,.13)}.login-form button{min-height:50px;border:0;border-radius:12px;background:var(--accent);color:white;font:inherit;font-weight:800;cursor:pointer}.login-form button:hover{background:var(--accent2)}.back{display:inline-block;margin-top:18px;color:var(--muted);font-size:14px;text-decoration:none}.alert{padding:11px 13px;border-radius:10px;margin:0 0 16px;font-size:14px}.alert.error{background:#fff0ee;color:var(--danger);border:1px solid #ffd2cc}.table-card{background:white;border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:var(--shadow)}.table-scroll{overflow:auto}.admin-table{border-collapse:collapse;width:100%;min-width:760px}.admin-table th,.admin-table td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;font-size:13px}.admin-table th{background:#f8faff;position:sticky;top:0;z-index:1}.empty{padding:28px;color:var(--muted)}.doc-group{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px;margin-bottom:14px}.doc-group h3{margin:0 0 5px}.doc-group p{color:var(--muted);margin:0 0 12px;font-size:13px}.doc-files{display:flex;flex-wrap:wrap;gap:8px}.doc-files a{font-size:13px;text-decoration:none;border:1px solid var(--line);border-radius:9px;padding:8px 10px;background:#fafcff}.doc-files a:hover{background:#eef4ff}@media(max-width:760px){.admin-top__in,.admin-wrap{width:min(100% - 20px,1180px)}.admin-wrap{padding-top:30px}.grid{grid-template-columns:1fr}.section-head{align-items:start;flex-direction:column}.top-actions .student-link{display:none}.login-card{padding:24px}}