:root{--bg: #f6f7fb;--surface: #ffffff;--border: #dfe3ec;--text: #16192a;--muted: #6b7284;--accent: #4c5fd7;--danger: #c0392b;--radius: 10px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}.app{max-width:720px;margin:0 auto;padding:32px 16px 64px}h1{font-size:1.5rem;margin:0 0 4px}.muted{color:var(--muted);font-size:.9rem}.centered{text-align:center;padding:48px 0}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px}.auth-card{max-width:420px;margin:40px auto}.dashboard-section{margin-top:16px}.dashboard-section h2{margin:0 0 4px;font-size:1.1rem}form{display:flex;flex-direction:column;gap:14px;margin-top:20px}.field{display:flex;flex-direction:column;gap:5px}label{font-size:.85rem;font-weight:600}.input{padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:.95rem;background:var(--surface);color:var(--text);width:100%}.input:focus-visible{outline:2px solid var(--accent);outline-offset:1px}.input-error{border-color:var(--danger)}.hint{font-size:.78rem;color:var(--muted)}.error{font-size:.78rem;color:var(--danger)}.alert{background:#fdecea;border:1px solid #f5c6c0;color:#922b21;padding:10px 12px;border-radius:8px;font-size:.88rem}.btn{padding:10px 16px;border-radius:8px;font-size:.92rem;font-weight:600;cursor:pointer;border:1px solid transparent}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff}.btn-ghost{background:transparent;border-color:var(--border);color:var(--text)}.link{background:none;border:none;padding:0;color:var(--accent);font:inherit;cursor:pointer;text-decoration:underline}.switch{margin-top:18px;text-align:center}.role-select{border:none;padding:0;margin:0;min-width:0}.role-select legend{font-size:.85rem;font-weight:600;padding:0;margin-bottom:6px}.role-options{display:flex;gap:10px}.role-option{flex:1;display:flex;flex-direction:column;gap:2px;padding:10px 12px;border:1px solid var(--border);border-radius:8px;cursor:pointer;background:var(--surface)}.role-option:focus-within{outline:2px solid var(--accent);outline-offset:1px}.role-option-active{border-color:var(--accent);background:#eef0fb}.role-option input{position:absolute;opacity:0;width:0;height:0}.role-label{font-weight:600;font-size:.92rem}.role-blurb{font-size:.76rem;color:var(--muted)}.role-badge{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;padding:3px 9px;border-radius:999px;border:1px solid transparent}.role-badge-student{background:#e6f0fd;color:#1f4e8c;border-color:#c3daf7}.role-badge-mentor{background:#e9f7ee;color:#1d6b3a;border-color:#bfe6cd}.captcha{display:flex;flex-direction:column;gap:10px}.captcha-row{display:flex;align-items:center;gap:10px}.captcha-image,.captcha-placeholder{width:220px;height:70px;border:1px solid var(--border);border-radius:8px;background:#f2f4f7}.captcha-placeholder{display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:.85rem}.captcha-refresh{font-size:.8rem;padding:6px 10px}.topbar{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:20px}.topbar-actions{display:flex;align-items:center;gap:10px}.search-controls{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.search-input{flex:1;min-width:220px;padding:12px 14px}.result-count{margin:14px 0 8px}.results{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}.result-title{font-weight:600;color:var(--accent);text-decoration:none;font-size:1.02rem}.result-title:hover{text-decoration:underline}.result-url{font-size:.8rem;color:var(--muted);word-break:break-all;margin:2px 0 8px}.tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}.chip{background:#eef0f8;border:1px solid var(--border);border-radius:999px;padding:3px 10px;font-size:.76rem;color:var(--muted);cursor:pointer}.chip-active{background:var(--accent);border-color:var(--accent);color:#fff}.empty{text-align:center;padding:28px 0}.app-nav,.tabs{display:flex;gap:6px;margin-bottom:18px;border-bottom:1px solid var(--border)}.app-nav{justify-content:space-between;align-items:center;flex-wrap:wrap}.app-nav-tabs{display:flex;gap:6px}.app-nav-user{display:flex;align-items:center;gap:10px}.tab{background:none;border:none;border-bottom:2px solid transparent;padding:8px 14px;font:inherit;font-size:.92rem;font-weight:600;color:var(--muted);cursor:pointer}.tab-active{color:var(--accent);border-bottom-color:var(--accent)}.admin{max-width:100%}.panel-h{font-size:1.1rem;margin:0 0 4px}.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(96px,1fr));gap:10px;margin-bottom:18px}.stat{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:10px 12px;display:flex;flex-direction:column}.stat-value{font-size:1.35rem;font-weight:700}.stat-label{font-size:.72rem;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}.notice{background:#e9f7ee;border:1px solid #bfe6cd;color:#1d6b3a;padding:9px 12px;border-radius:8px;font-size:.86rem}.admin-controls{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:12px}.admin-controls .input{width:auto;flex:1;min-width:150px}.admin-actions{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px}.admin-actions .btn{width:auto}.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:8px;background:var(--surface)}.table{width:100%;border-collapse:collapse;font-size:.86rem}.table th,.table td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--border);white-space:nowrap}.table th{font-size:.72rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);background:#fafbfe}.table tr:last-child td{border-bottom:none}.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.8rem}.status{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;padding:2px 8px;border-radius:999px}.status-new{background:#f1f2f6;color:#5b6172}.status-invited{background:#fff4e0;color:#8a5a00}.status-activated{background:#e9f7ee;color:#1d6b3a}.textarea{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.85rem;line-height:1.5;resize:vertical}@media(max-width:480px){.topbar{flex-direction:column}.captcha-row{flex-direction:column;align-items:flex-start}}