:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --bg: #f4f6fb;
    --sidebar-bg: #111827;
    --sidebar-text: #d1d5db;
    --card-bg: #ffffff;
    --border: #e5e7eb;
    --text: #1f2937;
    --muted: #6b7280;
    --success: #059669;
    --error: #dc2626;
    --warning: #d97706;
    --info: #0284c7;
    --radius: 10px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Segoe UI', Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

a { text-decoration: none; color: inherit; }

/* ---------- App shell ---------- */
.app-shell { display: flex; min-height: 100vh; }

.sidebar {
    width: 230px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    transition: margin-left .25s ease;
}
.sidebar-brand {
    padding: 20px 18px;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    border-bottom: 1px solid rgba(255,255,255,.08);
}
.sidebar nav { display: flex; flex-direction: column; padding: 10px 0; }
.sidebar nav a {
    padding: 12px 20px;
    font-size: 14.5px;
    color: var(--sidebar-text);
    border-left: 3px solid transparent;
}
.sidebar nav a:hover { background: rgba(255,255,255,.06); color: #fff; }
.sidebar nav a.active {
    background: rgba(37,99,235,.15);
    color: #fff;
    border-left-color: var(--primary);
    font-weight: 600;
}

.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }

.topbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 14px 22px;
    display: flex;
    align-items: center;
    gap: 14px;
}
.topbar h2 { margin: 0; font-size: 19px; flex: 1; }
.menu-toggle { display: none; background: none; border: none; font-size: 22px; cursor: pointer; }
.topbar-user { display: flex; align-items: center; gap: 12px; font-size: 14px; }
.topbar-user small { color: var(--muted); }

.content { padding: 24px; flex: 1; }

/* ---------- Cards / grid ---------- */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}
.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
}
.stat-card .num { font-size: 28px; font-weight: 700; color: var(--primary-dark); }
.stat-card .label { color: var(--muted); font-size: 13.5px; margin-top: 4px; }

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

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: left; }
th { background: #f9fafb; font-weight: 600; color: #374151; }
tr:hover td { background: #f9fafb; }
.badge { padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 600; display: inline-block; }
.badge-present, .badge-active, .badge-paid, .badge-returned { background: #d1fae5; color: var(--success); }
.badge-absent, .badge-inactive, .badge-unpaid { background: #fee2e2; color: var(--error); }
.badge-partial, .badge-issued, .badge-vacated { background: #fef3c7; color: var(--warning); }

/* ---------- Forms ---------- */
form { display: flex; flex-direction: column; gap: 4px; }
label { font-size: 13.5px; font-weight: 600; margin-top: 10px; color: #374151; }
input, select, textarea {
    padding: 9px 11px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    width: 100%;
}
textarea { resize: vertical; min-height: 80px; }
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }

.btn {
    display: inline-block;
    background: var(--primary);
    color: #fff !important;
    border: none;
    padding: 9px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 14px;
    text-align: center;
}
.btn:hover { background: var(--primary-dark); }
.btn-sm { padding: 5px 12px; font-size: 13px; margin-top: 0; }
.btn-danger { background: var(--error); }
.btn-danger:hover { background: #b91c1c; }
.btn-secondary { background: #6b7280; }
.btn-block { width: 100%; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }

.toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; flex-wrap: wrap; gap: 10px; }

/* ---------- Alerts ---------- */
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }
.alert-success { background: #d1fae5; color: #065f46; }
.alert-error { background: #fee2e2; color: #991b1b; }
.alert-info { background: #dbeafe; color: #1e40af; }
.alert-warning { background: #fef3c7; color: #92400e; }

/* ---------- Auth pages ---------- */
.auth-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e40af, #2563eb);
}
.auth-box {
    background: #fff;
    padding: 36px 34px;
    border-radius: 14px;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 20px 40px rgba(0,0,0,.2);
}
.auth-box h1 { margin-top: 0; font-size: 22px; text-align: center; color: var(--primary-dark); }
.auth-box p.sub { text-align: center; color: var(--muted); margin-top: -8px; font-size: 13.5px; }
.role-tabs { display: flex; gap: 6px; margin-bottom: 16px; }
.role-tabs label {
    flex: 1;
    text-align: center;
    padding: 8px 0;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    font-size: 13.5px;
    margin: 0;
}
.role-tabs input { display: none; }
.role-tabs input:checked + span { font-weight: 700; }
.role-tabs label:has(input:checked) { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
    .sidebar { position: fixed; z-index: 40; height: 100vh; margin-left: -230px; }
    .sidebar.open { margin-left: 0; }
    .menu-toggle { display: block; }
}