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

:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --danger: #dc2626;
    --danger-hover: #b91c1c;
    --success: #16a34a;
    --warning: #f59e0b;
    --bg: #f1f5f9;
    --card-bg: #ffffff;
    --border: #e2e8f0;
    --text: #1e293b;
    --text-muted: #64748b;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

/* Navbar */
.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 24px;
    height: 56px;
    gap: 24px;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    font-weight: 700;
    font-size: 16px;
    color: var(--primary);
    white-space: nowrap;
}

.nav-links {
    display: flex;
    gap: 4px;
    flex: 1;
}

.nav-links a {
    padding: 8px 14px;
    text-decoration: none;
    color: var(--text);
    border-radius: 6px;
    font-size: 14px;
    transition: background 0.15s;
}

.nav-links a:hover { background: var(--bg); }
.nav-links a.active { background: var(--primary); color: #fff; }

.nav-user {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    white-space: nowrap;
}

.role-badge {
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 12px;
    background: #e0e7ff;
    color: var(--primary);
}

/* Main content */
.main-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: 24px;
}

/* Page header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.page-header h2 { font-size: 22px; }

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

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

.card-header h3 { font-size: 16px; }

.card-body { padding: 20px; }

/* Stats grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow);
}

.stat-card-link {
    display: block;
    text-decoration: none;
    color: inherit;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
}

.stat-card-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 4px;
}

.reminder {
    padding: 10px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    margin-bottom: 8px;
}

.reminder-warning {
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fcd34d;
}

.reminder-ok {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #6ee7b7;
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table th, .table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}

.table th {
    font-weight: 600;
    background: #f8fafc;
    color: var(--text-muted);
    font-size: 13px;
}

.table tbody tr:hover { background: #f8fafc; }

.text-ellipsis {
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.actions { white-space: nowrap; }

/* Buttons */
.btn {
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fff;
    color: var(--text);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.15s;
}

.btn:hover { background: var(--bg); }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger { background: #fff; color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 13px; }
.btn-block { width: 100%; }

/* Forms */
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 14px; font-weight: 500; margin-bottom: 4px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.15s;
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}

.form-row { display: flex; gap: 14px; }
.flex-1 { flex: 1; }
.required { color: var(--danger); }
.text-muted { color: var(--text-muted); }
.mb-3 { margin-bottom: 14px; }

/* Badges */
.badge {
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 500;
}

.badge-a { background: #fef2f2; color: #dc2626; }
.badge-b { background: #fef3c7; color: #d97706; }
.badge-c { background: #dbeafe; color: #2563eb; }
.badge-d { background: #f3f4f6; color: #6b7280; }
.badge-admin { background: #ede9fe; color: #7c3aed; }
.badge-staff { background: #e0f2fe; color: #0284c7; }
.badge-active { background: #dcfce7; color: #16a34a; }
.badge-inactive { background: #fee2e2; color: #dc2626; }

.link { color: var(--primary); text-decoration: none; cursor: pointer; }
.link:hover { text-decoration: underline; }

/* Two column layout */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
@media (max-width: 900px) { .two-col { grid-template-columns: 1fr; } }

/* Detail grid */
.detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}
.detail-item label {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 2px;
}
.detail-item span { font-size: 14px; }

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.4);
}

.modal-content {
    position: relative;
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    width: 90%;
    max-width: 520px;
    max-height: 85vh;
    overflow-y: auto;
}

.modal-content.modal-lg { max-width: 680px; }
.modal-content.modal-xl { max-width: 900px; }

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

.modal-header h3 { font-size: 16px; }

.modal-close {
    background: none;
    border: none;
    font-size: 22px;
    cursor: pointer;
    color: var(--text-muted);
    line-height: 1;
}

.modal-close:hover { color: var(--text); }

.modal-body { padding: 20px; }

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 14px 20px;
    border-top: 1px solid var(--border);
}

/* Toast */
.toast {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 2000;
    padding: 12px 20px;
    border-radius: 8px;
    color: #fff;
    font-size: 14px;
    transform: translateX(120%);
    transition: transform 0.3s;
    max-width: 360px;
}

.toast.show { transform: translateX(0); }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

/* Login page */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-card {
    background: #fff;
    border-radius: 12px;
    padding: 40px;
    width: 400px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.login-card h1 {
    text-align: center;
    font-size: 24px;
    margin-bottom: 6px;
}

.login-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 28px;
}

.login-form .form-group { margin-bottom: 16px; }
.login-form .btn { padding: 12px; font-size: 16px; margin-top: 8px; }

.login-hint {
    margin-top: 20px;
    padding: 12px;
    background: #f8fafc;
    border-radius: 6px;
    text-align: center;
}

.login-hint p { font-size: 12px; color: var(--text-muted); line-height: 1.6; }

/* Deleted rows */
.row-deleted {
    opacity: 0.55;
    background: #f9fafb !important;
}
.row-deleted td {
    color: #9ca3af !important;
}

/* Field validation */
.error-field {
    border-color: var(--danger) !important;
    box-shadow: 0 0 0 3px rgba(220,38,38,0.1) !important;
}
.field-msg {
    display: block;
    font-size: 12px;
    color: var(--danger);
    margin-top: 3px;
    min-height: 0;
}

/* Divider */
hr {
    border: none;
    border-top: 1px solid var(--border);
}

/* Date group headers */
.date-group {
    margin-bottom: 24px;
}
.date-group:last-child {
    margin-bottom: 0;
}
.date-group-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0 10px 0;
}
.date-group-icon {
    font-size: 16px;
}
.date-group-title {
    font-weight: 600;
    font-size: 15px;
    color: var(--text);
    white-space: nowrap;
}
.date-group-line {
    flex: 1;
    height: 1px;
    background: var(--border);
}

/* Form control for filter inputs */
.form-control {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
}

/* Responsive stats */
@media (max-width: 768px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .navbar { padding: 0 12px; gap: 8px; }
    .nav-links a { padding: 6px 8px; font-size: 13px; }
}