/* ===== CSS Variables ===== */
:root {
    --primary-color: #00B5EF;
    --primary-dark: #0095C8;
    --secondary-color: #1E3A5F;
    --success-color: #10B981;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --bg-dark: #0F172A;
    --bg-card: #1E293B;
    --bg-card-hover: #334155;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --border-color: #334155;
    --sidebar-width: 280px;
    --sidebar-collapsed: 70px;
    --header-height: 70px;
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== Sidebar ===== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: width 0.3s ease, transform 0.3s ease;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 700;
}

.logo i {
    font-size: 1.8rem;
}

.sidebar.collapsed .logo span {
    display: none;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.2s;
}

.sidebar-toggle:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.sidebar-menu {
    flex: 1;
    overflow-y: auto;
    padding: 16px 0;
}

.menu-section {
    margin-bottom: 16px;
}

.menu-title {
    padding: 8px 20px;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    font-weight: 600;
}

.sidebar.collapsed .menu-title {
    display: none;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s;
    border-left: 3px solid transparent;
    font-size: 0.9rem;
}

.menu-item:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.menu-item.active {
    background: rgba(255, 107, 0, 0.1);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.menu-item i {
    width: 20px;
    text-align: center;
    font-size: 1rem;
}

.sidebar.collapsed .menu-item span {
    display: none;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
}

.data-timestamp {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.sidebar.collapsed .data-timestamp span {
    display: none;
}

/* ===== Main Content ===== */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: margin-left 0.3s ease;
}

.sidebar.collapsed ~ .main-content {
    margin-left: var(--sidebar-collapsed);
}

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    height: var(--header-height);
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 8px;
}

.header h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 24px;
}

.header-stats {
    display: flex;
    gap: 24px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.stat-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.stat-change {
    font-size: 0.75rem;
    font-weight: 500;
}

.stat-change.positive {
    color: var(--success-color);
}

.stat-change.negative {
    color: var(--danger-color);
}

.currency-toggle {
    display: flex;
    background: var(--bg-dark);
    border-radius: 8px;
    padding: 4px;
}

.currency-btn {
    padding: 8px 16px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s;
}

.currency-btn.active {
    background: var(--primary-color);
    color: white;
}

/* ===== Content Wrapper ===== */
.content-wrapper {
    padding: 24px;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

/* ===== Page Header ===== */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.toggle-group, .view-options {
    display: flex;
    background: var(--bg-card);
    border-radius: 8px;
    padding: 4px;
}

.toggle-btn, .view-btn {
    padding: 10px 20px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s;
}

.toggle-btn.active, .view-btn.active {
    background: var(--primary-color);
    color: white;
}

.toggle-btn:hover:not(.active), .view-btn:hover:not(.active) {
    background: var(--bg-card-hover);
}

/* ===== Treemap Container ===== */
.treemap-container {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 24px;
    border: 1px solid var(--border-color);
}

/* ===== Country Modal ===== */
.country-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.country-modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border-radius: 16px;
    width: 100%;
    max-width: 800px;
    max-height: 90vh;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.2s;
}

.modal-close:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
}

.modal-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.modal-stat {
    background: var(--bg-dark);
    padding: 16px;
    border-radius: 12px;
    text-align: center;
}

.modal-stat .label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.modal-stat .value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.modal-stat .change {
    font-size: 0.85rem;
    font-weight: 500;
}

.modal-stat .change.positive {
    color: var(--success-color);
}

.modal-stat .change.negative {
    color: var(--danger-color);
}

.modal-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.tab-btn {
    padding: 10px 20px;
    background: var(--bg-dark);
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s;
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
}

.modal-chart {
    background: var(--bg-dark);
    border-radius: 12px;
    padding: 16px;
}

/* ===== Dashboard Cards ===== */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 24px;
}

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

.dashboard-card.full-width {
    grid-column: 1 / -1;
}

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

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-subtitle {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.card-badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.card-badge.success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
}

.card-badge.warning {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning-color);
}

.card-badge.danger {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger-color);
}

.chart-container {
    height: 300px;
}

/* ===== KPI Cards ===== */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.kpi-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.kpi-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.kpi-icon.orange {
    background: rgba(255, 107, 0, 0.2);
    color: var(--primary-color);
}

.kpi-icon.green {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
}

.kpi-icon.blue {
    background: rgba(59, 130, 246, 0.2);
    color: #3B82F6;
}

.kpi-icon.purple {
    background: rgba(139, 92, 246, 0.2);
    color: #8B5CF6;
}

.kpi-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.kpi-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.kpi-change {
    font-size: 0.8rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 4px;
}

.kpi-change.positive {
    color: var(--success-color);
}

.kpi-change.negative {
    color: var(--danger-color);
}

/* ===== Table Styles ===== */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table td {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.data-table tbody tr:hover {
    background: var(--bg-card-hover);
}

.rank-badge {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 600;
}

.rank-badge.gold {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: #1a1a1a;
}

.rank-badge.silver {
    background: linear-gradient(135deg, #C0C0C0, #A0A0A0);
    color: #1a1a1a;
}

.rank-badge.bronze {
    background: linear-gradient(135deg, #CD7F32, #B87333);
    color: white;
}

/* ===== Progress Bar ===== */
.progress-bar {
    height: 8px;
    background: var(--bg-dark);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.5s ease;
}

.progress-fill.orange {
    background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
}

.progress-fill.green {
    background: linear-gradient(90deg, #10B981, #059669);
}

.progress-fill.blue {
    background: linear-gradient(90deg, #3B82F6, #2563EB);
}

.progress-fill.red {
    background: linear-gradient(90deg, #EF4444, #DC2626);
}

/* ===== Alert Badges ===== */
.alert-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.alert-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-dark);
    border-radius: 8px;
    border-left: 4px solid;
}

.alert-item.critical {
    border-color: var(--danger-color);
}

.alert-item.warning {
    border-color: var(--warning-color);
}

.alert-item.info {
    border-color: #3B82F6;
}

.alert-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.alert-item.critical .alert-icon {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger-color);
}

.alert-item.warning .alert-icon {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning-color);
}

.alert-item.info .alert-icon {
    background: rgba(59, 130, 246, 0.2);
    color: #3B82F6;
}

.alert-content {
    flex: 1;
}

.alert-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.alert-description {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ===== Word Cloud ===== */
.word-cloud-container {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    padding: 24px;
}

.word-item {
    padding: 8px 16px;
    border-radius: 20px;
    background: var(--bg-dark);
    color: var(--text-primary);
    transition: transform 0.2s;
}

.word-item:hover {
    transform: scale(1.1);
}

.word-item.size-1 { font-size: 0.8rem; opacity: 0.6; }
.word-item.size-2 { font-size: 1rem; opacity: 0.7; }
.word-item.size-3 { font-size: 1.2rem; opacity: 0.8; }
.word-item.size-4 { font-size: 1.5rem; opacity: 0.9; }
.word-item.size-5 { font-size: 1.8rem; font-weight: 600; }

/* ===== Sankey Diagram Placeholder ===== */
.flow-diagram {
    height: 400px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .header-stats {
        display: none;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: var(--sidebar-width);
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .page-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .toggle-group, .view-options {
        justify-content: center;
    }
    
    .kpi-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .currency-toggle {
        display: none;
    }
}

@media (max-width: 480px) {
    .content-wrapper {
        padding: 16px;
    }
    
    .kpi-grid {
        grid-template-columns: 1fr;
    }
    
    .toggle-btn, .view-btn {
        padding: 8px 12px;
        font-size: 0.85rem;
    }
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.page.active {
    animation: fadeIn 0.3s ease;
}

/* ===== Utility Classes ===== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }