:root {
    --primary-color: #2c3e50;
    --accent-color: #27ae60;
    --bg-color: #ecf0f1;
    --card-bg: #ffffff;
    --text-color: #2c3e50;
    --border-color: #bdc3c7;
    --error-color: #e74c3c;
}

body.dark-mode {
    --primary-color: #ecf0f1;
    --accent-color: #27ae60;
    --bg-color: #1a1a2e;
    --card-bg: #16213e;
    --text-color: #e0e0e0;
    --border-color: #3a3a5c;
    --error-color: #ff6b6b;
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    margin: 0;
    padding: 0;
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 20px;
}

/* Center everything when no data is loaded */
body:not(.data-loaded) .container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

body:not(.data-loaded) header {
    margin-bottom: 0;
}

body:not(.data-loaded) #file-selection {
    margin-top: 40px;
}

/* Top Controls */
#top-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

#top-controls button {
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: 1px solid var(--primary-color);
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.3s, border-color 0.3s;
    font-size: 14px;
}

#top-controls button:hover {
    background: #1a252f;
    border-color: #1a252f;
}

#top-controls button#clear-cache {
    background: var(--error-color);
}

#top-controls button#clear-cache:hover {
    background: #c0392b;
}

body.dark-mode #top-controls button {
    color: #ffffff;
    border-color: #4a4a6c;
    background: #2c3e50;
}

body.dark-mode #top-controls button#reload-data,
body.dark-mode #top-controls button#export-data {
    color: #ffffff;
    background: #2c3e50;
    border: 1px solid #4a4a6c;
}

body.dark-mode #top-controls button:hover {
    background: #3498db;
    border-color: #3498db;
}

body.dark-mode #top-controls button#reload-data:hover,
body.dark-mode #top-controls button#export-data:hover {
    background: #3498db;
    border-color: #3498db;
}

body.dark-mode #top-controls button#clear-cache {
    background: #e74c3c;
    border-color: #e74c3c;
}

body.dark-mode #top-controls button#clear-cache:hover {
    background: #c0392b;
    border-color: #c0392b;
}

body.dark-mode #top-controls button#dark-mode-toggle,
body.dark-mode #top-controls button#help-button {
    color: #ffffff;
    background: #2c3e50;
    border: 1px solid #4a4a6c;
}

body.dark-mode #top-controls button#dark-mode-toggle:hover,
body.dark-mode #top-controls button#help-button:hover {
    background: #3498db;
    border-color: #3498db;
}

#top-controls button:hover {
    background: #1a252f;
}

body.dark-mode #top-controls button {
    color: #ffffff;
    border-color: #4a4a6c;
}

body.dark-mode #top-controls button:hover {
    background: #3498db;
    border-color: #3498db;
}

#top-controls button#clear-cache {
    background: var(--error-color);
}

#top-controls button#clear-cache:hover {
    background: #c0392b;
}

body.dark-mode #top-controls button {
    color: #ffffff;
}

body.dark-mode #top-controls button:hover {
    background: #3498db;
}

body.dark-mode #top-controls button#clear-cache {
    background: #e74c3c;
}

body.dark-mode #top-controls button#clear-cache:hover {
    background: #c0392b;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: var(--primary-color);
    margin: 0 0 10px 0;
}

.subtitle {
    color: #7f8c8d;
    margin: 0;
}

/* Hide subtitle when data is loaded */
body.data-loaded .subtitle {
    display: none;
}

/* Hide header when no data, show only centered content */
body:not(.data-loaded) header {
    text-align: center;
}

/* File Selection */
#file-selection {
    text-align: center;
}

#file-selection.hidden {
    display: none;
}

#select-directory {
    padding: 12px 30px;
    font-size: 16px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.3s;
}

#select-directory:hover {
    background: #229954;
}

/* Status Bar */
#status-bar {
    margin-top: 20px;
    padding: 15px;
    background: var(--card-bg);
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    min-width: 400px;
    max-width: 600px;
}

#status-text {
    display: block;
    margin-bottom: 10px;
}

#progress-bar {
    width: 100%;
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
}

#progress-fill {
    height: 100%;
    background: var(--accent-color);
    transition: width 0.3s;
    width: 0%;
}

#cache-stats {
    display: block;
    margin-top: 8px;
    font-size: 12px;
    color: #7f8c8d;
}

#processing-file {
    display: block;
    margin-top: 5px;
    font-size: 13px;
    color: var(--text-color);
}

#current-file-name {
    font-weight: 600;
}

#processing-details {
    display: block;
    margin-top: 8px;
    font-size: 12px;
    color: #7f8c8d;
}

/* Dashboard */
#dashboard {
    margin-top: 30px;
}

/* Summary Cards */
.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.card h3 {
    margin: 0 0 10px 0;
    color: #7f8c8d;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card p {
    margin: 0;
    font-size: 28px;
    font-weight: bold;
    color: var(--primary-color);
}

/* Chart Controls */
.chart-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

/* Time Period Tabs */
.time-period-tabs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.time-period-tabs button {
    padding: 10px 20px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 14px;
    color: var(--text-color);
}

.time-period-tabs button:hover {
    border-color: var(--accent-color);
}

.time-period-tabs button.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

body.dark-mode .time-period-tabs button {
    color: var(--text-color);
    border-color: var(--border-color);
}

body.dark-mode .time-period-tabs button:hover {
    border-color: var(--accent-color);
}

body.dark-mode .time-period-tabs button.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

/* Charts */
.charts-container {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    min-height: 400px;
}

/* Chart Options */
.chart-options {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
}

.chart-type-buttons {
    display: flex;
    gap: 5px;
}

.chart-type-buttons button {
    padding: 8px 12px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 16px;
    color: var(--text-color);
}

.chart-type-buttons button:hover {
    border-color: var(--accent-color);
}

.chart-type-buttons button.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

body.dark-mode .chart-type-buttons button {
    color: var(--text-color);
    border-color: var(--border-color);
}

body.dark-mode .chart-type-buttons button:hover {
    border-color: var(--accent-color);
}

body.dark-mode .chart-type-buttons button.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

/* Date Range Filter */
.date-range-filter {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.date-range-filter label {
    font-size: 13px;
    color: var(--text-color);
}

.date-range-filter input[type="date"] {
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 13px;
}

body.dark-mode .date-range-filter input[type="date"] {
    background: #2a2a4a;
    border-color: #4a4a6c;
    color: var(--text-color);
}

.date-range-filter button {
    padding: 6px 12px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    transition: background 0.3s;
}

.date-range-filter button:hover {
    background: #229954;
}

body.dark-mode .date-range-filter button {
    background: #2c3e50;
    color: white;
}

body.dark-mode .date-range-filter button:hover {
    background: #34495e;
}

.date-range-filter button#clear-date-filter {
    background: var(--primary-color);
}

body.dark-mode .date-range-filter button#clear-date-filter {
    background: #e74c3c;
    border-color: #e74c3c;
}

.date-range-filter button#clear-date-filter:hover {
    background: #1a252f;
}

body.dark-mode .date-range-filter button#clear-date-filter:hover {
    background: #c0392b;
    border-color: #c0392b;
}

/* Model Filter for Chart */
.model-filter-chart {
    display: flex;
    align-items: center;
    gap: 10px;
}

.model-filter-chart label {
    font-size: 14px;
    color: var(--text-color);
}

.model-filter-chart select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 14px;
    cursor: pointer;
}

.model-filter-chart select:hover {
    border-color: var(--accent-color);
}

.model-filter-chart select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(39, 174, 96, 0.1);
}

body.dark-mode .model-filter-chart select,
body.dark-mode .model-filter select {
    background: #2a2a4a;
    border-color: #4a4a6c;
    color: var(--text-color);
}

body.dark-mode .model-filter-chart select:focus,
body.dark-mode .model-filter select:focus {
    background: #2a2a4a;
    border-color: var(--accent-color);
}

#tps-chart {
    width: 100%;
    height: 400px;
}

/* Sessions List */
.sessions-list {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.sessions-list h2 {
    margin: 0 0 15px 0;
    color: var(--primary-color);
}

#sessions-table table {
    width: 100%;
    border-collapse: collapse;
}

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

#sessions-table th {
    background: #f8f9fa;
    font-weight: 600;
    color: var(--primary-color);
}

#sessions-table tr:hover {
    background: #f8f9fa;
}

#sessions-table code {
    background: #f4f4f4;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 12px;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.modal-content h2 {
    margin: 0 0 15px 0;
    color: var(--error-color);
}

.modal-content p {
    margin: 0 0 20px 0;
    color: var(--text-color);
}

.modal-content button {
    padding: 10px 20px;
    background: var(--primary-color);
    color: var(--bg-color);
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.modal-content button:hover {
    background: #1a252f;
}

body.dark-mode .modal-content button {
    background: var(--primary-color);
    color: var(--bg-color);
}

body.dark-mode .modal-content button:hover {
    background: #3498db;
}

/* Help Modal */
.help-modal-content {
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
}

.help-section {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.help-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.help-section h3 {
    margin: 0 0 8px 0;
    color: var(--primary-color);
    font-size: 16px;
}

.help-section p {
    margin: 0 0 10px 0;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-color);
}

.help-section ul {
    margin: 8px 0 0 20px;
    padding: 0;
    font-size: 14px;
}

.help-section li {
    margin: 4px 0;
    line-height: 1.4;
    color: var(--text-color);
}

/* Utility */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
    .summary-cards {
        grid-template-columns: 1fr;
    }

    .time-period-tabs {
        flex-direction: column;
    }

    .time-period-tabs button {
        width: 100%;
    }

    #tps-chart {
        height: 300px;
    }

    #sessions-table {
        font-size: 14px;
    }

    #sessions-table th,
    #sessions-table td {
        padding: 8px;
    }

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

    .sessions-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .model-filter {
        width: 100%;
    }

    .model-filter select {
        flex: 1;
    }
}

/* DataTables Custom Styling */
#sessions-datatable_wrapper {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

#sessions-datatable thead th {
    background: var(--primary-color) !important;
    color: var(--bg-color) !important;
    font-weight: 600;
    border-bottom: none !important;
}

body.dark-mode #sessions-datatable thead th {
    background: #1a252f !important;
    color: #ecf0f1 !important;
    border-bottom: 1px solid #4a4a6c !important;
}

#sessions-datatable tbody td {
    padding: 12px !important;
}

body.dark-mode #sessions-datatable tbody td {
    color: #e0e0e0 !important;
}

#sessions-datatable tbody tr:hover {
    background: #f8f9fa !important;
}

body.dark-mode #sessions-datatable tbody tr:hover {
    background: #2a2a4a !important;
}

#sessions-datatable code {
    background: var(--bg-color);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 12px;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

body.dark-mode #sessions-datatable code {
    background: #2a2a4a;
    border-color: #4a4a6c;
}

/* DataTables pagination */
.dataTables_wrapper .dataTables_paginate .paginate_button {
    color: var(--text-color) !important;
    border: 1px solid var(--border-color) !important;
    background: var(--card-bg) !important;
}

.dataTables_wrapper .dataTables_paginate .paginate_button:hover {
    background: var(--bg-color) !important;
    border: 1px solid var(--border-color) !important;
}

body.dark-mode .dataTables_wrapper .dataTables_paginate .paginate_button:hover {
    background: #2a2a4a !important;
}

.dataTables_wrapper .dataTables_paginate .paginate_button.current {
    background: var(--accent-color) !important;
    color: white !important;
    border: 1px solid var(--accent-color) !important;
}

/* DataTables search input */
.dataTables_wrapper .dataTables_filter input {
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 6px 12px;
    margin-left: 8px;
    background: var(--card-bg);
    color: var(--text-color);
}

/* DataTables length selector */
.dataTables_wrapper .dataTables_length select {
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 4px 8px;
    margin: 0 8px;
    background: var(--card-bg);
    color: var(--text-color);
}

/* DataTables info */
.dataTables_wrapper .dataTables_info {
    color: var(--text-color);
}

/* Model Statistics Section */
.model-stats-section {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
}

.model-stats-section h2 {
    margin: 0 0 20px 0;
    color: var(--primary-color);
}

.model-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.model-stat-card {
    background: var(--card-bg);
    padding: 15px;
    border-radius: 6px;
    border-left: 4px solid var(--accent-color);
}

.model-stat-card h4 {
    margin: 0 0 12px 0;
    color: var(--primary-color);
    font-size: 14px;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
    font-size: 13px;
}

.stat-row span {
    color: #7f8c8d;
}

.stat-row strong {
    color: var(--text-color);
}

.stat-row:last-child {
    margin-bottom: 0;
}

.stat-row.percentile-row {
    flex-direction: column;
    align-items: flex-start;
    margin-top: 8px;
}

.stat-row.percentile-row span {
    margin-bottom: 4px;
}

/* Percentile Cards */
.percentile-card {
    text-align: left;
}

.percentile-card h3 {
    text-align: center;
}

.percentile-values {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.percentile-values div {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
}

.percentile-values span {
    color: #7f8c8d;
}

.percentile-values strong {
    color: var(--primary-color);
    font-size: 16px;
}

/* Sessions Header with Model Filter */
.sessions-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 15px;
}

.sessions-header h2 {
    margin: 0;
    color: var(--primary-color);
}

.model-filter {
    display: flex;
    align-items: center;
    gap: 10px;
}

.model-filter label {
    font-size: 14px;
    color: var(--text-color);
}

.model-filter select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 14px;
    cursor: pointer;
}

.model-filter select:hover {
    border-color: var(--accent-color);
}

.model-filter select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(39, 174, 96, 0.1);
}