:root{--sea-primary:#2563eb;--sea-primary-dark:#1d4ed8;--sea-teacher:#7c3aed;--sea-teacher-dark:#6d28d9;--sea-bg:#f8fafc;--sea-card-bg:#ffffff;--sea-border:#e2e8f0;--sea-text:#0f172a;--sea-text-muted:#64748b;--sea-error-bg:#fef2f2;--sea-error-text:#b91c1c;--sea-error-border:#fecaca;--sea-radius:16px}.sea-card{max-width:420px;margin:40px auto;padding:32px 28px;background:var(--sea-card-bg);border:1px solid var(--sea-border);border-radius:var(--sea-radius);box-shadow:0 10px 30px rgb(15 23 42 / .06);font-family:'Tahoma','Segoe UI',system-ui,sans-serif;color:var(--sea-text);box-sizing:border-box}.sea-card *{box-sizing:border-box}.sea-title{margin:0 0 6px;font-size:24px;font-weight:700;text-align:center}.sea-subtitle{margin:0 0 24px;font-size:14px;color:var(--sea-text-muted);text-align:center;line-height:1.6}.sea-form{display:flex;flex-direction:column;gap:6px}.sea-label{font-size:13px;font-weight:600;margin-top:10px}.sea-input{width:100%;padding:11px 14px;border:1px solid var(--sea-border);border-radius:10px;font-size:14px;background:var(--sea-bg);color:var(--sea-text);outline:none;transition:border-color .15s,box-shadow .15s}.sea-input:focus{border-color:var(--sea-primary);box-shadow:0 0 0 3px rgb(37 99 235 / .15)}.sea-password-wrap{position:relative;display:flex}.sea-password-wrap .sea-input{flex:1;padding-left:40px}.sea-toggle-pass{position:absolute;left:8px;top:50%;transform:translateY(-50%);background:none;border:none;cursor:pointer;font-size:16px;padding:4px;line-height:1}.sea-checkbox{display:flex;align-items:center;gap:8px;font-size:13px;margin-top:12px;color:var(--sea-text-muted);font-weight:400}.sea-hint{font-size:12px;margin:2px 0 0;color:#16a34a;min-height:16px}.sea-hint-error{color:var(--sea-error-text)}.sea-btn{margin-top:20px;padding:13px;border:none;border-radius:10px;color:#fff;font-size:15px;font-weight:700;cursor:pointer;background:var(--sea-primary);transition:background .15s,transform .05s}.sea-btn:hover{background:var(--sea-primary-dark)}.sea-btn:active{transform:translateY(1px)}.sea-btn-teacher{background:var(--sea-teacher)}.sea-btn-teacher:hover{background:var(--sea-teacher-dark)}.sea-switch{margin:20px 0 0;text-align:center;font-size:13px;color:var(--sea-text-muted)}.sea-switch a{color:var(--sea-primary);font-weight:600;text-decoration:none;margin-right:4px}.sea-switch a:hover{text-decoration:underline}.sea-alert{padding:10px 14px;border-radius:10px;font-size:13px;margin-bottom:16px;border:1px solid #fff0}.sea-alert-error{background:var(--sea-error-bg);color:var(--sea-error-text);border-color:var(--sea-error-border)}.sea-already{text-align:center}.sea-logout-link{display:inline-block;margin-top:10px;color:var(--sea-error-text);font-weight:600;text-decoration:none}@media (max-width:480px){.sea-card{margin:20px 16px;padding:24px 18px}}