:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #d97706;
    --bg: #f4f6f9;
    --card-bg: #ffffff;
    --text: #1f2937;
    --border: #e5e7eb;
    --sidebar-width: 240px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 15px;
    line-height: 1.5;
}

/* ---------- Auth pages ---------- */
.auth-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(135deg, #2563eb 0%, #1e3a8a 100%);
}
.auth-card {
    background: var(--card-bg);
    padding: 36px 32px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    width: 100%;
    max-width: 380px;
}
.auth-card h2 { text-align: center; color: var(--primary); }
.auth-card .subtitle { text-align: center; color: #6b7280; margin-bottom: 24px; font-size: 14px; }

/* ---------- Forms ---------- */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 14px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}
.form-row { display: flex; gap: 12px; }
.form-row .form-group { flex: 1; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-block { width: 100%; }
.btn-sm { padding: 6px 12px; font-size: 13px; }

/* ---------- Alerts ---------- */
.alert { padding: 12px 14px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }
.alert-error { background: #fee2e2; color: #991b1b; }
.alert-warning { background: #fef3c7; color: #92400e; }
.alert-success { background: #dcfce7; color: #166534; }

/* ---------- Layout: Sidebar + Content ---------- */
.app-wrapper { display: flex; min-height: 100vh; }
.sidebar {
    width: var(--sidebar-width);
    background: #111827;
    color: #d1d5db;
    padding: 20px 0;
    flex-shrink: 0;
}
.sidebar .logo { padding: 0 20px 20px; font-weight: 700; color: #fff; font-size: 18px; border-bottom: 1px solid #374151; margin-bottom: 10px; }
.sidebar a {
    display: block;
    padding: 12px 20px;
    color: #d1d5db;
    text-decoration: none;
    font-size: 14px;
}
.sidebar a:hover, .sidebar a.active { background: #1f2937; color: #fff; border-left: 3px solid var(--primary); }
.main-content { flex: 1; padding: 24px; max-width: 100%; overflow-x: auto; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.topbar h1 { font-size: 22px; }

/* ---------- Cards / Stats ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: var(--card-bg); padding: 18px; border-radius: 10px; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.stat-card .label { font-size: 13px; color: #6b7280; margin-bottom: 6px; }
.stat-card .value { font-size: 26px; font-weight: 700; }
.card { background: var(--card-bg); border-radius: 10px; padding: 20px; box-shadow: 0 1px 3px rgba(0,0,0,0.08); margin-bottom: 20px; }

/* ---------- Table ---------- */
table { width: 100%; border-collapse: collapse; background: var(--card-bg); }
table th, table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
table th { background: #f9fafb; font-weight: 600; }
.badge { padding: 3px 10px; border-radius: 12px; font-size: 12px; font-weight: 600; }
.badge-success { background: #dcfce7; color: #166534; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-info { background: #dbeafe; color: #1e40af; }

/* ---------- Mobile ---------- */
@media (max-width: 768px) {
    .app-wrapper { flex-direction: column; }
    .sidebar { width: 100%; padding: 10px 0; }
    .sidebar a { display: inline-block; padding: 10px 14px; }
    .main-content { padding: 16px; }
    .form-row { flex-direction: column; gap: 0; }
    table { font-size: 13px; }
}

/* ---------- Attendance camera widget ---------- */
#camera-preview { width: 100%; max-width: 400px; border-radius: 10px; background: #000; }
.face-status { padding: 10px; border-radius: 8px; text-align: center; font-weight: 600; margin-top: 10px; }