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

:root {
    --primary-color: #4F46E5;
    --primary-light: #818CF8;
    --secondary-color: #10B981;
    --warning-color: #F59E0B;
    --danger-color: #EF4444;
    --background: #F9FAFB;
    --card-bg: #FFFFFF;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --border-color: #E5E7EB;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    text-align: center;
    padding: 40px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border-radius: 16px;
    margin-bottom: 24px;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.header .subtitle {
    opacity: 0.9;
    font-size: 1rem;
}

/* Upload Section */
.upload-section {
    margin-top: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.upload-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
    padding: 10px 24px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.upload-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: white;
}

.upload-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.upload-status {
    font-size: 0.85rem;
    opacity: 0.9;
}

.upload-status.success {
    color: #A7F3D0;
}

.upload-status.error {
    color: #FCA5A5;
}

.upload-status.loading {
    color: #FDE68A;
}

/* Admin Upload Section */
.upload-card {
    background: linear-gradient(135deg, #F3F4F6, #E5E7EB);
    border: 2px dashed var(--border-color);
}

.upload-section-admin {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 20px;
}

.upload-btn-admin {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 32px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.upload-btn-admin:hover {
    background: var(--primary-light);
    transform: translateY(-1px);
}

.upload-btn-admin:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.upload-section-admin .upload-status {
    color: var(--text-secondary);
}

.upload-section-admin .upload-status.success {
    color: var(--secondary-color);
}

.upload-section-admin .upload-status.error {
    color: var(--danger-color);
}

.upload-section-admin .upload-status.loading {
    color: var(--warning-color);
}

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

.overview-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
}

.card-icon {
    font-size: 2.5rem;
}

.card-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.card-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Card */
.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow);
    margin-bottom: 16px;
}

.card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.card-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 16px;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    overflow-x: auto;
    padding-bottom: 8px;
}

.tab {
    padding: 12px 24px;
    border: none;
    background: var(--card-bg);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.tab:hover {
    background: var(--primary-light);
    color: white;
}

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

/* Tab Content */
.tab-content {
    display: none;
}

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

/* Heatmap */
.heatmap-container {
    overflow-x: auto;
}

#heatmap {
    min-width: 600px;
}

.heatmap-row {
    display: flex;
    align-items: center;
    margin-bottom: 2px;
}

.heatmap-label {
    width: 40px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: right;
    padding-right: 8px;
}

.heatmap-cell {
    width: 28px;
    height: 28px;
    margin: 1px;
    border-radius: 4px;
    cursor: pointer;
    transition: transform 0.1s;
}

.heatmap-cell:hover {
    transform: scale(1.2);
    z-index: 1;
}

.heatmap-header {
    display: flex;
    margin-left: 48px;
    margin-bottom: 4px;
}

.heatmap-hour {
    width: 30px;
    font-size: 0.625rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Wordcloud */
.wordcloud-container {
    min-height: 300px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.word-item {
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s;
}

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

.word-item.category-업무 { background: #DBEAFE; color: #1D4ED8; }
.word-item.category-일상 { background: #D1FAE5; color: #059669; }
.word-item.category-감정 { background: #FEE2E2; color: #DC2626; }
.word-item.category-소통 { background: #FEF3C7; color: #D97706; }
.word-item.category-기타 { background: #E5E7EB; color: #374151; }

/* Keyword Categories */
.keyword-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.category-section {
    background: var(--background);
    padding: 16px;
    border-radius: 8px;
}

.category-section h3 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.category-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.category-keyword {
    font-size: 0.75rem;
    padding: 4px 10px;
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

/* Network Graph */
.network-container {
    min-height: 500px;
    background: var(--background);
    border-radius: 8px;
    overflow: hidden;
}

.network-container svg {
    width: 100%;
    height: 500px;
}

.node-user {
    fill: var(--primary-color);
    stroke: white;
    stroke-width: 2;
}

.node-keyword {
    fill: var(--secondary-color);
    stroke: white;
    stroke-width: 2;
}

.node-label {
    font-size: 10px;
    fill: var(--text-primary);
    pointer-events: none;
}

.link {
    stroke: var(--border-color);
    stroke-opacity: 0.6;
}

/* Admin Section */
.admin-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
}

.member-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.member-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--background);
    border-radius: 8px;
}

.member-item .rank {
    font-weight: 700;
    color: var(--primary-color);
    margin-right: 12px;
}

.member-item .name {
    flex: 1;
    font-weight: 500;
}

.member-item .count {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.member-list.warning .member-item {
    background: #FEF2F2;
    border-left: 3px solid var(--danger-color);
}

.member-list.new .member-item {
    background: #F0FDF4;
    border-left: 3px solid var(--secondary-color);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.stat-item {
    text-align: center;
    padding: 16px;
    background: var(--background);
    border-radius: 8px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Recommended Hours */
.recommended-hours {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.hour-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border-radius: 8px;
    font-weight: 600;
}

.hour-badge .time {
    font-size: 1.25rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 24px;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer p {
    margin: 4px 0;
}

/* Chart Customization */
canvas {
    max-height: 400px;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }

    .header {
        padding: 24px 16px;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .tabs {
        gap: 4px;
    }

    .tab {
        padding: 10px 16px;
        font-size: 0.75rem;
    }

    .card {
        padding: 16px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .admin-grid {
        grid-template-columns: 1fr;
    }
}

/* Tooltip */
.tooltip {
    position: absolute;
    background: var(--text-primary);
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.75rem;
    pointer-events: none;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

/* Full Width Card */
.card.full-width {
    grid-column: 1 / -1;
}

/* Loading State */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
    color: var(--text-secondary);
}

.loading::after {
    content: '';
    width: 24px;
    height: 24px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 12px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}