:root{--primary: #0d6e52;--primary-light: #1a9d72;--primary-dark: #064a36;--accent: #f0b429;--bg: #f0f4f2;--surface: #ffffff;--text: #0f1f1a;--muted: #5c6f66;--border: #dce6e0;--danger: #dc3545;--success: #198754;--sidebar-w: 260px;--radius: 14px;--shadow: 0 4px 24px rgba(15, 31, 26, .06);font-family:Segoe UI,Inter,system-ui,sans-serif;color:var(--text);background:var(--bg);line-height:1.5}*{box-sizing:border-box;margin:0;padding:0}body{min-height:100vh;background:var(--bg)}a{color:inherit;text-decoration:none}button,input,select{font:inherit}.login-page{min-height:100vh;display:grid;place-items:center;background:linear-gradient(145deg,var(--primary-dark) 0%,var(--primary) 50%,#0a3d2e 100%);padding:24px}.login-brand{text-align:center;color:#fff;margin-bottom:28px}.login-brand h1{font-size:2rem;letter-spacing:.15em;font-weight:800}.login-brand p{opacity:.85;margin-top:8px}.login-card{width:min(420px,100%);background:var(--surface);border-radius:var(--radius);padding:36px;box-shadow:0 20px 60px #00000040}.app-shell{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-w);background:var(--primary-dark);color:#fff;display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100}.sidebar-brand{padding:28px 24px 20px;border-bottom:1px solid rgba(255,255,255,.1)}.sidebar-brand h1{font-size:1.1rem;letter-spacing:.12em;font-weight:800}.sidebar-brand span{display:block;font-size:.75rem;opacity:.65;margin-top:4px;letter-spacing:.05em}.sidebar-nav{flex:1;padding:16px 12px;overflow-y:auto}.nav-section{font-size:.68rem;text-transform:uppercase;letter-spacing:.1em;opacity:.45;padding:12px 12px 6px;font-weight:700}.nav-link{display:flex;align-items:center;gap:10px;padding:11px 14px;border-radius:10px;color:#ffffffbf;font-weight:600;font-size:.92rem;margin-bottom:2px;transition:background .15s,color .15s}.nav-link:hover{background:#ffffff14;color:#fff}.nav-link.active{background:#ffffff26;color:#fff}.nav-icon{font-size:1.1rem;width:22px;text-align:center}.sidebar-footer{padding:16px;border-top:1px solid rgba(255,255,255,.1)}.user-chip{display:flex;align-items:center;gap:10px;padding:10px 12px;background:#ffffff14;border-radius:10px;margin-bottom:10px}.user-avatar{width:36px;height:36px;border-radius:50%;background:var(--accent);color:var(--primary-dark);display:grid;place-items:center;font-weight:800;font-size:.85rem}.user-email{font-size:.78rem;opacity:.8;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:160px}.main-area{margin-left:var(--sidebar-w);flex:1;display:flex;flex-direction:column;min-height:100vh}.topbar{background:var(--surface);border-bottom:1px solid var(--border);padding:16px 32px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:50}.topbar-title{font-size:1.15rem;font-weight:700;color:var(--text)}.content{padding:28px 32px 48px;flex:1}.page-header{margin-bottom:28px}.page-header h2{font-size:1.6rem;font-weight:800;color:var(--text)}.page-header p{color:var(--muted);margin-top:6px;font-size:.95rem}.stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px;margin-bottom:28px}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.stat-card .label{font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}.stat-card .value{font-size:2rem;font-weight:800;color:var(--primary-dark);margin-top:6px}.stat-card .icon{font-size:1.4rem;margin-bottom:8px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.card-header{padding:20px 24px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:12px}.card-header h3{font-size:1rem;font-weight:700}.card-body{padding:24px}.form-grid{display:grid;gap:18px;max-width:560px}.form-row-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}label{display:grid;gap:7px;font-weight:600;font-size:.88rem;color:var(--text)}label span.hint{font-weight:400;font-size:.8rem;color:var(--muted)}input,select{padding:11px 14px;border:1px solid var(--border);border-radius:10px;background:#fff;transition:border-color .15s}input:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #0d6e521f}.btn{border:none;border-radius:10px;padding:11px 20px;font-weight:700;cursor:pointer;font-size:.92rem;transition:opacity .15s,transform .1s}.btn:active{transform:scale(.98)}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-light)}.btn-primary:disabled{opacity:.55;cursor:not-allowed}.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text)}.btn-danger-outline{background:transparent;border:1px solid #f5c2c7;color:var(--danger)}.btn-sm{padding:7px 14px;font-size:.82rem}.btn-ghost-light{background:#ffffff1a;color:#fff;border:1px solid rgba(255,255,255,.2);width:100%}.alert{padding:13px 16px;border-radius:10px;margin-bottom:18px;font-size:.92rem}.alert-error{background:#fde8ea;color:var(--danger);border:1px solid #f5c2c7}.alert-success{background:#d1e7dd;color:#0a3622;border:1px solid #a3cfbb}.alert-info{background:#cff4fc;color:#055160;border:1px solid #9eeaf9}.badge{display:inline-block;padding:3px 10px;border-radius:20px;font-size:.75rem;font-weight:700}.badge-admin{background:#fff3cd;color:#856404}.badge-student{background:#d1e7dd;color:#0a3622}.badge-verified{background:#cfe2ff;color:#084298}.table-wrap{overflow-x:auto}table.data-table{width:100%;border-collapse:collapse;font-size:.9rem}table.data-table th{text-align:left;padding:12px 16px;font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:#f8faf9;border-bottom:1px solid var(--border);font-weight:700}table.data-table td{padding:14px 16px;border-bottom:1px solid var(--border);vertical-align:middle}table.data-table tr:last-child td{border-bottom:none}table.data-table tr:hover td{background:#f8faf9}.user-cell{display:flex;align-items:center;gap:12px}.user-cell-avatar{width:38px;height:38px;border-radius:50%;background:var(--primary);color:#fff;display:grid;place-items:center;font-weight:700;font-size:.9rem;flex-shrink:0}.user-cell-name{font-weight:700}.user-cell-sub{font-size:.8rem;color:var(--muted)}.role-toggle{display:flex;gap:6px}.role-btn{padding:6px 12px;border-radius:8px;border:1px solid var(--border);background:#fff;cursor:pointer;font-size:.82rem;font-weight:600}.role-btn.active-admin{background:#fff3cd;border-color:#ffc107;color:#856404}.role-btn.active-student{background:#d1e7dd;border-color:#198754;color:#0a3622}.perm-grid{display:grid;gap:12px}.perm-row{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border:1px solid var(--border);border-radius:10px;background:#fafcfb}.perm-row-info strong{display:block;font-size:.92rem}.perm-row-info span{font-size:.8rem;color:var(--muted)}.toggle{position:relative;width:44px;height:24px;flex-shrink:0}.toggle input{opacity:0;width:0;height:0}.toggle-slider{position:absolute;top:0;right:0;bottom:0;left:0;background:#ccc;border-radius:24px;cursor:pointer;transition:.2s}.toggle-slider:before{content:"";position:absolute;width:18px;height:18px;left:3px;bottom:3px;background:#fff;border-radius:50%;transition:.2s}.toggle input:checked+.toggle-slider{background:var(--primary)}.toggle input:checked+.toggle-slider:before{transform:translate(20px)}.loading-center{display:grid;place-items:center;padding:60px;color:var(--muted)}.search-bar{display:flex;gap:12px;margin-bottom:20px}.search-bar input{flex:1;max-width:360px}.search-bar select{min-width:160px}.password-reveal{display:inline-flex;align-items:center;gap:6px;flex-wrap:wrap}.password-reveal-dots{font-size:.85rem;letter-spacing:.05em}.password-reveal-btn{border:none;background:transparent;cursor:pointer;padding:2px 4px;font-size:1rem;line-height:1;opacity:.75}.password-reveal-btn:hover:not(:disabled){opacity:1}.password-reveal-btn:disabled{cursor:not-allowed;opacity:.35}.password-reveal-error{font-size:.75rem;color:var(--danger);width:100%}.password-set-btn{border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:6px;padding:2px 8px;font-size:.75rem;cursor:pointer}.password-set-btn:hover{border-color:var(--primary);color:var(--primary)}.password-missing-label{font-size:.75rem;color:var(--muted)}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a73;display:flex;align-items:center;justify-content:center;z-index:1000;padding:16px}.modal-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:24px;width:min(420px,100%);box-shadow:0 12px 40px #00000026}.modal-card h3{margin:0 0 8px}.modal-help{margin:0 0 16px;font-size:.88rem;color:var(--muted);line-height:1.45}.field-label{display:block;margin-bottom:12px;font-size:.85rem;font-weight:600}.field-label input{display:block;width:100%;margin-top:6px;padding:8px 10px;border:1px solid var(--border);border-radius:8px;font:inherit}.modal-actions{display:flex;gap:8px;justify-content:flex-end;flex-wrap:wrap;margin-top:16px}.btn-secondary{background:var(--surface);border:1px solid var(--border);color:var(--text);border-radius:8px;padding:8px 14px;cursor:pointer}.btn-secondary:hover:not(:disabled){border-color:var(--primary)}.btn-secondary:disabled{opacity:.55;cursor:not-allowed}.toolbar-row{display:flex;gap:12px;margin-bottom:20px;flex-wrap:wrap;align-items:center}.toolbar-row input[type=search],.toolbar-row input[type=text]{flex:1;min-width:200px;max-width:360px}.toolbar-row select{min-width:160px}.empty-state{text-align:center;padding:48px 24px;color:var(--muted)}.empty-state .icon{font-size:2.5rem;margin-bottom:12px}@media(max-width:900px){.sidebar{width:72px}.sidebar-brand h1,.sidebar-brand span,.nav-link span:not(.nav-icon),.user-chip div,.nav-section{display:none}.main-area{margin-left:72px}.content{padding:20px 16px}.form-row-2{grid-template-columns:1fr}}[data-theme=dark]{--bg: #0f1613;--surface: #1a2622;--text: #e8f0ec;--muted: #9bb5aa;--border: #2a3d36;--shadow: 0 4px 24px rgba(0, 0, 0, .35)}[data-theme=dark] .card,[data-theme=dark] .login-card{background:var(--surface);border-color:var(--border)}[data-theme=dark] .data-table th{background:#152019}[data-theme=dark] .data-table tr:hover td{background:#ffffff08}[data-theme=dark] input,[data-theme=dark] select,[data-theme=dark] textarea{background:#121a17;color:var(--text);border-color:var(--border)}.settings-grid{display:grid;gap:28px}.settings-section h3{font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:14px}.settings-section label{display:flex;flex-direction:column;gap:8px;margin-bottom:16px;font-weight:600}.settings-section select{padding:10px 12px;border:1px solid var(--border);border-radius:10px;background:var(--surface);color:var(--text)}.settings-toggle{flex-direction:row!important;align-items:center;justify-content:space-between}.settings-toggle small{display:block;font-weight:400;color:var(--muted);margin-top:4px}.theme-preview{display:flex;gap:12px;margin-top:8px}.theme-preview-card{flex:1;padding:16px;border-radius:12px;border:2px solid var(--border);background:#f4f7f6;color:#1a2e28;text-align:center;font-weight:600}.theme-preview-card.dark{background:#121a17;color:#e8f0ec}.theme-preview-card.active{border-color:var(--primary-light);box-shadow:0 0 0 1px var(--primary-light)}.reminder-toggle{display:inline-flex;align-items:center;gap:8px;cursor:pointer;font-weight:600;font-size:.85rem}.reminder-toggle input{width:18px;height:18px;accent-color:var(--primary);cursor:pointer}