:root {
    --primary: #2c5f8a;
    --primary-dark: #1e4460;
    --accent: #e8a33d;
    --success: #2e8b57;
    --danger: #c0392b;
    --bg: #f4f6f8;
    --card-bg: #ffffff;
    --border: #dfe4e8;
    --text: #263238;
    --text-muted: #6b7c85;
    --radius: 8px;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: 'Segoe UI', Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar { background: var(--primary-dark); color: #fff; padding: 0 20px; }
.topbar-inner { max-width: 1200px; margin: auto; display: flex; justify-content: space-between; align-items: center; height: 60px; }
.topbar .brand { color: #fff; font-size: 20px; font-weight: bold; }
.topbar nav a { color: #e8eef2; margin-left: 18px; font-size: 14px; }
.topbar nav a:hover { color: var(--accent); text-decoration: none; }
.welcome { font-size: 13px; color: #cfe0ec; }
.role-badge { background: var(--accent); color: #3a2a00; padding: 2px 8px; border-radius: 10px; font-size: 11px; margin-left: 4px; text-transform: uppercase; }
.btn-link-danger { color: #ffb3a7 !important; }

.page-wrap { max-width: 1200px; margin: 24px auto; padding: 0 20px; min-height: 70vh; }

.layout { display: flex; gap: 24px; }
.sidebar { width: 230px; flex-shrink: 0; background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px 0; height: fit-content; }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li a { display: block; padding: 10px 18px; color: var(--text); font-size: 14px; }
.sidebar li a:hover { background: var(--bg); text-decoration: none; }
.sidebar li.active a { background: var(--primary); color: #fff; }
.sidebar .nav-heading { padding: 14px 18px 4px; font-size: 11px; text-transform: uppercase; color: var(--text-muted); letter-spacing: .5px; }
.content { flex: 1; min-width: 0; }

.card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; }
.card h2, .card h3 { margin-top: 0; }

.grid { display: grid; gap: 16px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr 1fr; } .layout { flex-direction: column; } .sidebar { width: 100%; } }
@media (max-width: 560px) { .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; } }

.stat-card { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; border-radius: var(--radius); padding: 18px; }
.stat-card .stat-value { font-size: 28px; font-weight: bold; }
.stat-card .stat-label { font-size: 13px; opacity: .85; }
.stat-card.alt { background: linear-gradient(135deg, var(--accent), #c9861a); }
.stat-card.green { background: linear-gradient(135deg, var(--success), #1f5f3b); }
.stat-card.red { background: linear-gradient(135deg, var(--danger), #8e2a1e); }

form.auth-form { max-width: 420px; margin: 40px auto; }
.form-group { margin-bottom: 16px; }
label { display: block; margin-bottom: 6px; font-size: 14px; font-weight: 600; }
input[type=text], input[type=password], input[type=email], input[type=tel], input[type=number], input[type=date], select, textarea {
    width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; background: #fff; color: var(--text);
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary); }
.btn {
    display: inline-block; background: var(--primary); color: #fff; border: none; padding: 10px 18px;
    border-radius: 6px; font-size: 14px; cursor: pointer; text-decoration: none;
}
.btn:hover { background: var(--primary-dark); text-decoration: none; }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #8e2a1e; }
.btn-success { background: var(--success); }
.btn-success:hover { background: #1f5f3b; }
.btn-outline { background: transparent; border: 1px solid var(--primary); color: var(--primary); }
.btn-secondary { background: #6c7a89; }
.btn-block { width: 100%; text-align: center; }

.alert { padding: 12px 16px; border-radius: 6px; margin-bottom: 16px; font-size: 14px; }
.alert-success { background: #e3f5e9; color: #1f5f3b; border: 1px solid #b9e3c6; }
.alert-error { background: #fbe6e3; color: #8e2a1e; border: 1px solid #f3c1b8; }
.alert-info { background: #e6f0f8; color: #1e4460; border: 1px solid #bcdaf0; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
table th, table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
table th { background: var(--bg); font-size: 12px; text-transform: uppercase; color: var(--text-muted); }
table tr:hover { background: #fafcfe; }

.badge { padding: 3px 9px; border-radius: 12px; font-size: 11px; text-transform: capitalize; }
.badge-active { background: #dcf3e3; color: #1f5f3b; }
.badge-pending { background: #fdf1d6; color: #8a6412; }
.badge-inactive { background: #eceff1; color: #607d8b; }
.badge-banned { background: #fbe0dc; color: #8e2a1e; }
.badge-locked { background: #f0d9f7; color: #6a1b8f; }
.badge-issued { background: #dbe9f7; color: #1e4460; }
.badge-overdue { background: #fbe0dc; color: #8e2a1e; }
.badge-returned { background: #dcf3e3; color: #1f5f3b; }

.footer { text-align: center; padding: 20px; color: var(--text-muted); font-size: 13px; }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.mb-0 { margin-bottom: 0; }
.small { font-size: 12px; }
.otp-input { letter-spacing: 8px; font-size: 22px; text-align: center; }
.filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }
.filters input, .filters select { width: auto; }
.library-card { max-width: 400px; border-radius: 14px; padding: 22px; background: linear-gradient(135deg,#2c5f8a,#173a54); color: #fff; }
.library-card h3 { margin: 0 0 4px; }
.library-card .card-no { font-size: 20px; letter-spacing: 2px; margin: 14px 0; }