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

:root {
    --bg: #f5f6fa;
    --surface: #ffffff;
    --border: #e8eaf0;
    --text: #1a1d27;
    --text-muted: #6b7280;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --danger: #dc2626;
    --danger-hover: #b91c1c;
    --success: #16a34a;
    --warning: #d97706;
    --sidebar-width: 260px;
    --header-height: 60px;
    --radius: 10px;
    --shadow: 0 1px 4px rgba(0,0,0,0.07);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
}

[data-theme="dark"] {
    --bg: #0f1117;
    --surface: #1a1d27;
    --border: #2a2d3a;
    --text: #e8eaf0;
    --text-muted: #9ca3af;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --danger: #ef4444;
    --danger-hover: #f87171;
    --shadow: 0 1px 4px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
}

html {
    font-size: 15px;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    color: var(--accent-hover);
}

.layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 200;
    transition: transform 0.28s cubic-bezier(.4,0,.2,1), box-shadow 0.28s;
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 20px 16px;
    border-bottom: 1px solid var(--border);
    min-height: var(--header-height);
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1rem;
    color: var(--text);
    white-space: nowrap;
}

.sidebar-brand svg {
    flex-shrink: 0;
    color: var(--accent);
}

.sidebar-close {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    display: none;
    padding: 4px;
    border-radius: 6px;
    transition: background 0.15s, color 0.15s;
}

.sidebar-close:hover {
    background: var(--bg);
    color: var(--text);
}

.sidebar-nav {
    flex: 1;
    padding: 12px 0;
}

.nav-section-label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 8px 20px 4px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    border-left: 3px solid transparent;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    white-space: nowrap;
}

.nav-link svg {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
}

.nav-link:hover {
    background: var(--bg);
    color: var(--text);
    border-left-color: var(--border);
}

.nav-link.active {
    background: #eff6ff;
    color: var(--accent);
    border-left-color: var(--accent);
    font-weight: 600;
}

[data-theme="dark"] .nav-link.active {
    background: rgba(59,130,246,0.12);
}

.sidebar-footer {
    padding: 12px 0;
    border-top: 1px solid var(--border);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.35);
    z-index: 150;
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.topbar {
    height: var(--header-height);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 24px;
    gap: 12px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.topbar-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    flex: 1;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text);
    padding: 6px;
    border-radius: 8px;
    transition: background 0.15s;
}

.menu-toggle:hover {
    background: var(--bg);
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    cursor: pointer;
    color: var(--text-muted);
    padding: 6px 10px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.theme-toggle:hover {
    background: var(--bg);
    color: var(--text);
}

.page-body {
    padding: 24px;
    flex: 1;
}

.page-header {
    margin-bottom: 24px;
}

.page-header h1 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
}

.page-header p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 4px;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 24px;
}

.card-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    box-shadow: var(--shadow);
}

.stat-card-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: #eff6ff;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    margin-bottom: 4px;
}

[data-theme="dark"] .stat-card-icon {
    background: rgba(59,130,246,0.15);
}

.stat-card-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-card-value {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

thead th {
    background: var(--bg);
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

tbody tr {
    border-bottom: 1px solid var(--border);
    transition: background 0.12s;
}

tbody tr:last-child {
    border-bottom: none;
}

tbody tr:hover {
    background: var(--bg);
}

tbody td {
    padding: 12px 14px;
    color: var(--text);
    vertical-align: middle;
}

.table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

form .form-group {
    margin-bottom: 16px;
}

form label {
    display: block;
    font-size: 0.83rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

form input[type="text"],
form input[type="email"],
form input[type="number"],
form input[type="password"],
form input[type="file"],
form input[type="date"],
form input[type="month"],
form textarea,
form select {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    font-size: 0.875rem;
    font-family: inherit;
    transition: border-color 0.15s, box-shadow 0.15s;
    outline: none;
    appearance: none;
}

input[type="date"],
input[type="month"] {
    color-scheme: light;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--text);
    font-size: 0.85rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.15s;
}

input[type="date"]:focus,
input[type="month"]:focus {
    border-color: var(--accent);
}

[data-theme="dark"] input[type="date"],
[data-theme="dark"] input[type="month"] {
    color-scheme: dark;
}

form input:focus,
form textarea:focus,
form select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

form textarea {
    resize: vertical;
    min-height: 80px;
}

form select[multiple] {
    min-height: 120px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 18px;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    border: none;
    transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
    white-space: nowrap;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-danger {
    background: var(--danger);
    color: #fff;
}

.btn-danger:hover {
    background: var(--danger-hover);
}

.btn-secondary {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

.btn-ghost {
    background: none;
    color: var(--accent);
    border: 1px solid var(--accent);
}

.btn-ghost:hover {
    background: #eff6ff;
}

.btn-sm {
    padding: 5px 12px;
    font-size: 0.8rem;
}

.form-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 20px;
}

.total-display {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
}

.phone-alert {
    color: var(--danger);
    font-size: 0.82rem;
    margin-top: 6px;
    font-weight: 500;
}

.badge {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 600;
}

.badge-blue {
    background: #dbeafe;
    color: #1d4ed8;
}

.badge-green {
    background: #dcfce7;
    color: #15803d;
}

[data-theme="dark"] .badge-blue {
    background: rgba(37,99,235,0.2);
    color: #93c5fd;
}

[data-theme="dark"] .badge-green {
    background: rgba(22,163,74,0.2);
    color: #86efac;
}

img.staff-img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border);
}

.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    padding: 24px;
}

.login-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px 36px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-md);
}

.login-logo {
    text-align: center;
    margin-bottom: 28px;
}

.login-logo svg {
    color: var(--accent);
}

.login-logo h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-top: 10px;
    color: var(--text);
}

.login-logo p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 4px;
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: none;
    }

    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-md);
    }

    .sidebar-close {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .sidebar-overlay.open {
        display: block;
    }

    .main-content {
        margin-left: 0;
    }

    .menu-toggle {
        display: flex;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .page-body {
        padding: 16px;
    }

    .login-card {
        padding: 28px 20px;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .stat-card {
        padding: 14px 12px;
    }

    .stat-card-value {
        font-size: 1.1rem;
    }

    .form-actions {
        flex-direction: column;
    }

    .btn {
        justify-content: center;
    }
}

.checkbox-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border);
    padding: 12px;
    border-radius: 8px;
    background: var(--bg);
}
.checkbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}
.checkbox-item:last-child {
    margin-bottom: 0;
}
.checkbox-item input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}
.checkbox-item label {
    margin-bottom: 0;
    font-weight: 500;
    cursor: pointer;
    user-select: none;
}