:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --dark-color: #1f2937;
    --light-color: #f9fafb;
    --sidebar-width: 280px;
}

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

body {
    font-family: 'Sarabun', 'Kanit', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Sidebar Styles */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: linear-gradient(180deg, #1e3a8a 0%, #1e40af 100%);
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: transform 0.3s ease;
    overflow-y: auto;
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar-header {
    padding: 25px 20px;
    background: rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-brand {
    color: white;
    font-size: 24px;
    font-weight: 700;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-brand i {
    font-size: 32px;
    color: #60a5fa;
}

.sidebar-nav {
    padding: 20px 0;
}

.nav-item {
    margin: 8px 15px;
}

.nav-link {
    color: rgba(255, 255, 255, 0.8);
    padding: 14px 20px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 15px;
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 16px;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transform: translateX(5px);
}

.nav-link.active {
    background: linear-gradient(135deg, #3b82f6 0%, #60a5fa 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.nav-link i {
    font-size: 20px;
    width: 25px;
    text-align: center;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    transition: margin-left 0.3s ease;
}

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

/* Top Navbar */
.top-navbar {
    background: white;
    padding: 20px 30px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 999;
}

.navbar-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 15px;
}

.menu-toggle {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--dark-color);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

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

/* Content Area */
.content-area {
    padding: 20px;
}

/* Stats Cards */
.stats-card {
    background: white;
    border-radius: 16px;
    padding: 25px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: none;
    height: 100%;
}

.stats-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.stats-card.primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.stats-card.success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

.stats-card.warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: white;
}

.stats-card.danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
}

.stats-icon {
    font-size: 48px;
    opacity: 0.9;
}

.stats-number {
    font-size: 36px;
    font-weight: 700;
    margin: 10px 0;
}

.stats-label {
    font-size: 16px;
    opacity: 0.95;
}

/* Card Styles */
.custom-card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    border: none;
    overflow: hidden;
    margin-bottom: 30px;
}

.custom-card-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 25px;
    border-bottom: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.custom-card-body {
    padding: 25px;
}

/* Button Styles */
.btn-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    color: white;
    padding: 12px 24px;
    border-radius: 10px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-gradient:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
    color: white;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    transition: all 0.3s ease;
}

/* Table Styles */
.custom-table {
    border-radius: 12px;
    overflow: hidden;
}

.custom-table thead {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.custom-table thead th {
    border: none;
    padding: 15px;
    font-weight: 600;
    text-align: center;
}

.custom-table tbody td {
    padding: 15px;
    vertical-align: middle;
    text-align: center;
}

.custom-table tbody tr {
    transition: all 0.3s ease;
}

.custom-table tbody tr:hover {
    background: rgba(102, 126, 234, 0.05);
    transform: scale(1.01);
}

/* Badge Styles */
.badge-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 8px 15px;
    border-radius: 20px;
    font-weight: 600;
}

/* Modal Styles */
.modal-content {
    border-radius: 20px;
    border: none;
    overflow: hidden;
}

.modal-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 20px 25px;
}

.modal-header .btn-close {
    filter: brightness(0) invert(1);
}

.modal-body {
    padding: 30px;
}

.modal-footer {
    border-top: 1px solid #e5e7eb;
    padding: 20px 30px;
}

/* Form Styles */
.form-label {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 8px;
}

.form-control, .form-select {
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    padding: 12px 15px;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

/* Calendar Styles */
#calendar {
    background: white;
    padding: 20px;
    border-radius: 16px;
}

.fc-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
    border: none !important;
    border-radius: 8px !important;
    padding: 8px 16px !important;
}

.fc-button:hover {
    transform: translateY(-2px);
}

/* Chart Container */
.chart-container {
    position: relative;
    height: 400px;
    padding: 20px;
}

/* Notification Badge */
.notification-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--danger-color);
    color: white;
    border-radius: 50%;
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(239, 68, 68, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(239, 68, 68, 0);
    }
}

/* Loading Spinner */
.spinner-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.spinner-overlay.active {
    display: flex;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.show {
        transform: translateX(0);
    }

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

    .navbar-title {
        font-size: 20px;
    }

    .content-area {
        padding: 15px;
    }

    .stats-number {
        font-size: 28px;
    }

    .stats-icon {
        font-size: 36px;
    }
}

/* Utilities */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-in {
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

/* Image Preview */
.image-preview {
    width: 100%;
    max-height: 200px;
    object-fit: cover;
    border-radius: 10px;
    margin-top: 10px;
}

.image-preview-container {
    position: relative;
    display: inline-block;
    margin: 5px;
}

.image-remove-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    background: rgba(239, 68, 68, 0.9);
    color: white;
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* News Card */
.news-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    margin-bottom: 20px;
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.news-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.news-card-body {
    padding: 20px;
}

/* Alert Notification */
.alert-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    max-width: 400px;
    z-index: 9999;
    animation: slideInRight 0.5s ease-out;
}

@keyframes slideInRight {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}