:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #d97706;
    --bg: #f1f5f9;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --radius: 10px;
}

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

body {
    font-family: 'Segoe UI', Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Login page ---------- */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #2563eb, #1e293b);
    padding: 20px;
}
.login-box {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
.login-box h1 {
    text-align: center;
    margin-bottom: 5px;
    color: var(--primary);
    font-size: 24px;
}
.login-box p.subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 25px;
    font-size: 14px;
}

/* ---------- Layout ---------- */
.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}
.navbar .brand {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
}
.navbar .brand span { color: var(--text); }
.nav-links {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}
.nav-links a, .nav-links span.nav-user {
    padding: 8px 14px;
    border-radius: 6px;
    font-size: 14px;
    color: var(--text);
}
.nav-links a:hover { background: var(--bg); text-decoration: none; }
.nav-links a.active { background: var(--primary); color: #fff; }
.nav-links span.nav-user { color: var(--text-light); }
.nav-links a.logout { color: var(--danger); }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
}

/* ---------- Cards ---------- */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 22px;
    margin-bottom: 22px;
}
.card h2, .card h3 { margin-bottom: 16px; }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 22px;
}
.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 18px;
    text-align: center;
}
.stat-card .num { font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-card .label { color: var(--text-light); font-size: 13px; margin-top: 4px; }

/* ---------- Forms ---------- */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 14px; }
.form-group input[type=text],
.form-group input[type=password],
.form-group input[type=email],
.form-group input[type=number],
.form-group input[type=date],
.form-group input[type=file],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    background: #fff;
    color: var(--text);
}
.form-group textarea { resize: vertical; min-height: 80px; }
.form-row { display: flex; gap: 12px; flex-wrap: wrap; }
.form-row .form-group { flex: 1; min-width: 160px; }
.checkbox-label { display: flex; align-items: center; gap: 8px; font-weight: 400; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    padding: 10px 18px;
    border-radius: 6px;
    border: none;
    background: var(--primary);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
}
.btn:hover { background: var(--primary-dark); text-decoration: none; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #b91c1c; }
.btn-success { background: var(--success); }
.btn-success:hover { background: #15803d; }
.btn-secondary { background: var(--text-light); }
.btn-secondary:hover { background: #475569; }
.btn-warning { background: var(--warning); }
.btn-warning:hover { background: #b45309; }
.btn-block { width: 100%; text-align: center; }
.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- Alerts ---------- */
.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 14px;
}
.alert-success { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.alert-error { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.alert-info { background: #dbeafe; color: #1e40af; border: 1px solid #bfdbfe; }

/* ---------- Tables ---------- */
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}
table th, table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    text-align: left;
}
table th { background: #f8fafc; font-weight: 600; white-space: nowrap; }
table tr:hover { background: #f8fafc; }
.table-wrapper { overflow-x: auto; }

/* ---------- Badges ---------- */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    color: #fff;
}
.badge-admin { background: var(--primary); }
.badge-user { background: var(--text-light); }
.badge-active { background: var(--success); }
.badge-disabled { background: var(--danger); }
.file-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 6px;
    color: #fff;
    font-size: 12px;
    font-weight: 700;
}

/* ---------- Misc ---------- */
.text-muted { color: var(--text-light); font-size: 13px; }
.flex-between { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.empty-state { text-align: center; padding: 40px 20px; color: var(--text-light); }
.modal-overlay {
    display: none;
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.5);
    align-items: center; justify-content: center;
    z-index: 1000;
}
.modal-overlay.open { display: flex; }
.modal-box {
    background: #fff;
    border-radius: var(--radius);
    padding: 24px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}