/* =========================================================================
   STYLE SYSTEM & CONSTANTS (Light & Dark Theme Variables)
   ========================================================================= */
:root {
    /* Fonts */
    --font-primary: 'Inter', 'Sarabun', sans-serif;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
    --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.07);

    /* Light Theme (Default) */
    --bg-main: #f4f6fa;
    --bg-sidebar: #ffffff;
    --bg-card: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.7);
    --border-glass: rgba(255, 255, 255, 0.4);
    
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    
    --border-color: #e2e8f0;
    
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #e0e7ff;
    
    --success: #10b981;
    --success-hover: #059669;
    --success-light: #d1fae5;
    
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --danger-light: #fee2e2;
    
    --warning: #f59e0b;
    --warning-hover: #d97706;
    --warning-light: #fef3c7;
    
    --orange: #f97316;
    --teal: #14b8a6;
    --purple: #8b5cf6;
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --bg-main: #0b0f19;
    --bg-sidebar: #111827;
    --bg-card: #1f2937;
    --bg-glass: rgba(31, 41, 55, 0.7);
    --border-glass: rgba(255, 255, 255, 0.05);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --border-color: #374151;
    
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: rgba(99, 102, 241, 0.15);
    
    --success: #34d399;
    --success-hover: #10b981;
    --success-light: rgba(52, 211, 153, 0.15);
    
    --danger: #f87171;
    --danger-hover: #ef4444;
    --danger-light: rgba(248, 113, 113, 0.15);
    
    --warning: #fbbf24;
    --warning-hover: #f59e0b;
    --warning-light: rgba(251, 191, 36, 0.15);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* =========================================================================
   LAYOUT STRUCTURE
   ========================================================================= */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.sidebar-header {
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--purple) 100%);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-size: 1.25rem;
    box-shadow: 0 4px 10px rgba(79, 70, 229, 0.3);
}

.logo-text h2 {
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.2;
}

.logo-text span {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.sidebar-menu {
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-grow: 1;
    overflow-y: auto;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: 10px;
    transition: all var(--transition-fast);
}

.menu-item i {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

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

.menu-item.active {
    background-color: var(--primary);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
}

.theme-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px;
    border-radius: 8px;
    background-color: var(--bg-main);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.theme-btn:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

/* Main Content Area */
.main-content {
    margin-left: 260px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.top-bar {
    height: 70px;
    background-color: var(--bg-sidebar);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    position: sticky;
    top: 0;
    z-index: 90;
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.page-title h1 {
    font-size: 1.35rem;
    font-weight: 600;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
}

.profile-info {
    text-align: right;
}

.profile-name {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
}

.profile-role {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.profile-avatar {
    width: 40px;
    height: 40px;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.content-body {
    padding: 32px;
    flex-grow: 1;
}

/* =========================================================================
   COMPONENTS & UTILITIES
   ========================================================================= */

/* Cards & Glassmorphism */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
    transition: background-color var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.glassmorphism {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--transition-fast);
}

.btn-primary {
    background-color: var(--primary);
    color: #ffffff;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--border-color);
    color: var(--text-secondary);
}
.btn-outline:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

.btn-danger {
    background-color: var(--danger);
    color: #ffffff;
}
.btn-danger:hover {
    background-color: var(--danger-hover);
    transform: translateY(-1px);
}

.btn-success {
    background-color: var(--success);
    color: #ffffff;
}
.btn-success:hover {
    background-color: var(--success-hover);
    transform: translateY(-1px);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
    border-radius: 6px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
    border-radius: 12px;
}

/* Tab Navigation System */
.tab-content {
    display: none;
    animation: fadeIn var(--transition-normal);
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* =========================================================================
   DASHBOARD TAB SPECIFIC
   ========================================================================= */

/* Metrics Row */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.metric-card {
    border-radius: 16px;
    padding: 24px;
    color: #ffffff;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.metric-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.metric-icon {
    width: 48px;
    height: 48px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.metric-info h3 {
    font-size: 0.85rem;
    font-weight: 500;
    opacity: 0.9;
    margin-bottom: 4px;
}

.metric-info p {
    font-size: 1.5rem;
    font-weight: 700;
}

/* Gradient Backgrounds for metrics */
.card-gradient-blue {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
}
.card-gradient-purple {
    background: linear-gradient(135deg, #8b5cf6 0%, #6d28d9 100%);
}
.card-gradient-green {
    background: linear-gradient(135deg, #10b981 0%, #047857 100%);
}
.card-gradient-orange {
    background: linear-gradient(135deg, #f97316 0%, #c2410c 100%);
}

/* Dashboard Layout Grid */
.dashboard-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
}

.dashboard-panel {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow-sm);
}

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

.panel-header h2 {
    font-size: 1.05rem;
    font-weight: 600;
}

.monthly-summary {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.monthly-stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.monthly-stat-item .label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.monthly-stat-item .value {
    font-size: 1.25rem;
    font-weight: 700;
}

.text-success {
    color: var(--success) !important;
}

.panel-divider {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 20px 0;
}

.quick-actions h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.quick-actions .action-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

/* =========================================================================
   TABLE COMPONENT
   ========================================================================= */
.table-responsive {
    width: 100%;
    overflow-x: auto;
}

.custom-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.custom-table th {
    background-color: var(--bg-main);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.85rem;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    letter-spacing: 0.5px;
}

.custom-table td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.92rem;
    color: var(--text-primary);
    vertical-align: middle;
}

.custom-table tbody tr:last-child td {
    border-bottom: none;
}

.custom-table tbody tr {
    transition: background-color var(--transition-fast);
}

.custom-table tbody tr:hover {
    background-color: var(--primary-light);
}

/* Table sorting and helper styles */
.sort-icon {
    font-size: 0.75rem;
    color: var(--text-muted);
    cursor: pointer;
    margin-left: 4px;
    transition: color var(--transition-fast);
}
.sort-icon:hover {
    color: var(--primary);
}

.text-center {
    text-align: center !important;
}
.text-muted {
    color: var(--text-muted) !important;
}

.btn-icon {
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

.btn-edit:hover {
    background-color: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
}

.btn-delete:hover {
    background-color: var(--danger-light);
    color: var(--danger);
    border-color: var(--danger);
}

/* =========================================================================
   SEARCH & FILTER BAR
   ========================================================================= */
.filter-bar {
    display: grid;
    grid-template-columns: 2fr 1.5fr 1fr 1fr 1.5fr;
    gap: 16px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.filter-group label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.filter-group input,
.filter-group select {
    padding: 10px 14px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-main);
    color: var(--text-primary);
    outline: none;
    font-family: var(--font-primary);
    font-size: 0.88rem;
    transition: all var(--transition-fast);
}

.filter-group input:focus,
.filter-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.action-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.action-buttons-left,
.action-buttons-right {
    display: flex;
    gap: 12px;
}

/* =========================================================================
   ANALYTICS & CHARTS
   ========================================================================= */
.analytics-charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 24px;
}

.chart-card {
    display: flex;
    flex-direction: column;
    height: 480px;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.chart-title-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.chart-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.chart-subtitle {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.chart-select {
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-main);
    color: var(--text-primary);
    outline: none;
    font-family: var(--font-primary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chart-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.chart-container {
    flex-grow: 1;
    position: relative;
    width: 100%;
    height: 100%;
}

/* =========================================================================
   BACKUP & RESTORE VIEW
   ========================================================================= */
.backup-container {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    gap: 40px;
}

.backup-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 400px;
}

.backup-big-icon {
    font-size: 3.5rem;
    color: var(--primary);
    margin-bottom: 20px;
    opacity: 0.8;
}

.backup-section h2 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.backup-section p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.5;
}

.vertical-divider {
    height: 250px;
    border: none;
    border-left: 1px solid var(--border-color);
}

.custom-file-upload {
    display: inline-block;
    padding: 14px 28px;
    cursor: pointer;
    font-weight: 500;
}

/* =========================================================================
   MODAL WINDOW COMPONENT
   ========================================================================= */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 16px;
    animation: fadeInModal var(--transition-fast) forwards;
}

.modal-content {
    width: 100%;
    max-width: 650px;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    padding: 32px;
    position: relative;
    transform: scale(0.95);
    opacity: 0;
    animation: scaleUpModal var(--transition-normal) 0.05s forwards;
    color: var(--text-primary);
}

@keyframes fadeInModal {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes scaleUpModal {
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.close-btn {
    position: absolute;
    top: 24px;
    right: 24px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color var(--transition-fast);
}

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

.modal h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 24px;
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 11px 16px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-main);
    color: var(--text-primary);
    outline: none;
    font-family: var(--font-primary);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.form-group textarea {
    resize: vertical;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-row {
    margin-bottom: 20px;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.required {
    color: var(--danger);
}

/* Form Calculations Output Area */
.calculation-summary {
    display: flex;
    gap: 16px;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    margin-top: 24px;
}

.calc-box {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.calc-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.calc-value {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

.calc-box.highlight .calc-value {
    color: var(--success);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 28px;
}

/* =========================================================================
   NOTIFICATION TOAST
   ========================================================================= */
.toast {
    position: fixed;
    bottom: -80px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    padding: 16px 24px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 2000;
    font-size: 0.92rem;
    font-weight: 500;
    transition: bottom 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.toast.show {
    bottom: 30px;
}

.toast i {
    font-size: 1.15rem;
}

.toast.success i {
    color: var(--success);
}
.toast.error i {
    color: var(--danger);
}
.toast.info i {
    color: var(--primary);
}

/* =========================================================================
   RESPONSIVE DESIGN (Media Queries)
   ========================================================================= */
@media (max-width: 1024px) {
    .sidebar {
        width: 80px;
        align-items: center;
    }
    
    .sidebar-header .logo-text,
    .sidebar-menu .menu-item span,
    .sidebar-footer .theme-btn span {
        display: none;
    }
    
    .sidebar-header {
        padding: 16px;
        justify-content: center;
    }
    
    .sidebar-menu {
        padding: 16px 8px;
    }
    
    .menu-item {
        padding: 12px;
        justify-content: center;
    }
    
    .main-content {
        margin-left: 80px;
    }
    
    .dashboard-layout {
        grid-template-columns: 1fr;
    }
    
    .filter-bar {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .content-body {
        padding: 16px;
    }
    
    .top-bar {
        padding: 0 16px;
    }
    
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .filter-bar {
        grid-template-columns: 1fr;
    }
    
    .action-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    
    .action-buttons-left,
    .action-buttons-right {
        justify-content: space-between;
    }
    
    .backup-container {
        flex-direction: column;
        padding: 20px;
    }
    
    .vertical-divider {
        display: none;
    }
    
    .analytics-charts-grid {
        grid-template-columns: 1fr;
    }
    
    .chart-card {
        height: 380px;
    }
}