/* ========================================
   CSS Variables - Light Theme (Default)
   ======================================== */
:root {
    /* Base Colors */
    --color-background: #f8f9fa;
    --color-surface: #ffffff;
    --color-text-primary: #1e293b;
    --color-text-secondary: #475569;
    --color-text-muted: #64748b;
    --color-text-on-dark: #ffffff;

    /* Brand Colors - Professional Blues */
    --color-primary: #0f52ba;
    --color-primary-dark: #0a3d8f;
    --color-primary-light: #e3f2fd;
    --color-accent: #1e40af;

    /* Semantic Colors */
    --color-success: #059669;
    --color-success-light: #d1fae5;
    --color-success-dark: #065f46;
    --color-warning: #d97706;
    --color-danger: #dc2626;
    --color-info: #0284c7;

    /* Neutral Colors - Professional Grays */
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;

    /* Gradients - Subtle & Muted */
    --gradient-primary-start: #2563eb;
    --gradient-primary-end: #3b82f6;

    /* Gradients - Success (Muted Green) */
    --gradient-success-start: #10b981;
    --gradient-success-end: #34d399;

    /* Gradients - Warning (Muted Orange/Red) */
    --gradient-warning-start: #f59e0b;
    --gradient-warning-end: #fb923c;

    /* Gradients - Info (Soft Blue) */
    --gradient-info-start: #3b82f6;
    --gradient-info-end: #60a5fa;

    /* Gradients - Small PR (Soft Green) */
    --gradient-small-start: #22c55e;
    --gradient-small-end: #4ade80;

    /* Gradients - Medium PR (Soft Amber) */
    --gradient-medium-start: #f59e0b;
    --gradient-medium-end: #fbbf24;

    /* Gradients - Large PR (Soft Red) */
    --gradient-large-start: #ef4444;
    --gradient-large-end: #f87171;

    /* Gradients - Comments (Soft Indigo) */
    --gradient-comments-start: #6366f1;
    --gradient-comments-end: #818cf8;

    /* Gradients - Commenters (Soft Cyan) */
    --gradient-commenters-start: #06b6d4;
    --gradient-commenters-end: #22d3ee;

    /* Gradients - Approvals (Soft Emerald) */
    --gradient-approvals-start: #10b981;
    --gradient-approvals-end: #34d399;

    /* Gradients - Approvers (Soft Teal) */
    --gradient-approvers-start: #14b8a6;
    --gradient-approvers-end: #2dd4bf;

    /* Gradients - Global Stats (Soft Blue) */
    --gradient-global-start: #3b82f6;
    --gradient-global-end: #60a5fa;

    /* Borders */
    --color-border: #ddd;
    --color-border-light: #ecf0f1;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.1);

    /* Trend Colors */
    --color-trend-decreasing-bg: #d4edda;
    --color-trend-decreasing-text: #155724;
    --color-trend-increasing-bg: #f8d7da;
    --color-trend-increasing-text: #721c24;

    /* Info Box */
    --color-info-bg: #f0f8ff;
    --color-info-border: #3498db;
}

/* ========================================
   CSS Variables - Dark Theme
   ======================================== */
[data-theme="dark"] {
    /* Base Colors */
    --color-background: #0f172a;
    --color-surface: #1e293b;
    --color-text-primary: #e2e8f0;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;
    --color-text-on-dark: #ffffff;

    /* Brand Colors - Professional Blues */
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-primary-light: #1e3a5f;
    --color-accent: #2563eb;

    /* Semantic Colors */
    --color-success: #10b981;
    --color-success-light: #1e3a2e;
    --color-success-dark: #d1fae5;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #06b6d4;

    /* Neutral Colors */
    --color-gray-50: #334155;
    --color-gray-100: #475569;
    --color-gray-200: #64748b;
    --color-gray-300: #94a3b8;
    --color-gray-400: #cbd5e1;
    --color-gray-500: #e2e8f0;
    --color-gray-600: #f1f5f9;
    --color-gray-700: #f8fafc;
    --color-gray-800: #ffffff;

    /* Borders */
    --color-border: #404040;
    --color-border-light: #3a3a3a;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.3);

    /* Trend Colors */
    --color-trend-decreasing-bg: #1e4620;
    --color-trend-decreasing-text: #a8e6a3;
    --color-trend-increasing-bg: #4a1e1e;
    --color-trend-increasing-text: #ffb3b3;

    /* Info Box */
    --color-info-bg: #1e3a52;
    --color-info-border: #5dade2;
}

/* ========================================
   Global Styles
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-background);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ========================================
   Loading & Container
   ======================================== */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-size: 1.5em;
    color: var(--color-text-secondary);
}

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

/* ========================================
   Headers
   ======================================== */
header {
    background: var(--color-surface);
    padding: 40px;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    margin-bottom: 30px;
}

h1 {
    color: var(--color-gray-800);
    margin-bottom: 10px;
    font-size: 2.5em;
    border-bottom: 3px solid var(--color-accent);
    padding-bottom: 10px;
}

h2 {
    color: var(--color-gray-800);
    margin-bottom: 16px;
    font-size: 1.5em;
    border-left: 4px solid var(--color-primary);
    padding-left: 12px;
}

h3 {
    color: var(--color-gray-700);
    margin-top: 24px;
    margin-bottom: 12px;
    font-size: 1.2em;
}

.report-meta {
    color: var(--color-text-muted);
    margin-top: 15px;
    font-size: 0.9em;
}

/* ========================================
   Sidebar Navigation
   ======================================== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 280px;
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
    overflow-y: auto;
    padding: 20px 0;
}

.sidebar-header {
    padding: 16px 20px;
    border-bottom: 2px solid var(--color-border-light);
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    gap: 10px;
}

.sidebar-title {
    font-size: 1.2em;
    font-weight: bold;
    color: var(--color-gray-800);
    margin-top: 4px;
}

.nav-item {
    padding: 15px 20px;
    cursor: pointer;
    border-left: 4px solid transparent;
    transition: all 0.3s ease;
}

.nav-item:hover {
    background: var(--color-gray-50);
    border-left-color: var(--color-primary);
}

.nav-item.active {
    background: var(--color-primary-light);
    border-left-color: var(--color-primary);
    font-weight: 600;
}

.nav-item-title {
    font-size: 1em;
    color: var(--color-gray-800);
}

.nav-item-meta {
    font-size: 0.85em;
    color: var(--color-text-muted);
    margin-top: 5px;
}

/* ========================================
   Main Content Area
   ======================================== */
.main-content {
    margin-left: 300px;
    padding: 20px;
}

/* ========================================
   Tab Navigation
   ======================================== */
.tab-navigation {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    background: var(--color-surface);
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

.tab-button {
    padding: 12px 24px;
    border: none;
    background: var(--color-gray-100);
    color: var(--color-gray-800);
    cursor: pointer;
    border-radius: 6px;
    font-size: 1em;
    font-weight: 500;
    transition: all 0.3s ease;
}

.tab-button:hover {
    background: var(--color-gray-200);
}

.tab-button.active {
    background: linear-gradient(135deg, var(--gradient-primary-start) 0%, var(--gradient-primary-end) 100%);
    color: var(--color-text-on-dark);
}

.tab-button.no-data {
    opacity: 0.6;
    font-style: italic;
}

.tab-button.no-data:hover {
    opacity: 0.8;
}

/* ========================================
   Tab Content
   ======================================== */
.tab-content {
    display: none;
    background: var(--color-surface);
    padding: 24px;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

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

/* ========================================
   Stats Grid & Cards
   ======================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    margin: 16px 0;
}

.stat-card {
    background: linear-gradient(135deg, var(--gradient-primary-start) 0%, var(--gradient-primary-end) 100%);
    color: var(--color-text-on-dark);
    padding: 14px 16px;
    border-radius: 6px;
    box-shadow: var(--shadow-md);
}

.stat-card.success {
    background: linear-gradient(135deg, var(--gradient-success-start) 0%, var(--gradient-success-end) 100%);
}

.stat-card.warning {
    background: linear-gradient(135deg, var(--gradient-warning-start) 0%, var(--gradient-warning-end) 100%);
}

.stat-card.info {
    background: linear-gradient(135deg, var(--gradient-info-start) 0%, var(--gradient-info-end) 100%);
}

.stat-label {
    font-size: 0.8em;
    opacity: 0.9;
    margin-bottom: 4px;
    font-weight: 500;
}

.stat-value {
    font-size: 1.5em;
    font-weight: 700;
    line-height: 1.2;
}

.stat-sub {
    font-size: 0.75em;
    opacity: 0.8;
    margin-top: 4px;
}

.stat-sub-extra {
    font-size: 0.7em;
    margin-top: 4px;
    opacity: 0.7;
}

/* ========================================
   Stat Card Variants
   ======================================== */
.stat-card-small-pr {
    background: linear-gradient(135deg, var(--gradient-small-start) 0%, var(--gradient-small-end) 100%);
}

.stat-card-medium-pr {
    background: linear-gradient(135deg, var(--gradient-medium-start) 0%, var(--gradient-medium-end) 100%);
}

.stat-card-large-pr {
    background: linear-gradient(135deg, var(--gradient-large-start) 0%, var(--gradient-large-end) 100%);
}

.stat-card-comments {
    background: linear-gradient(135deg, var(--gradient-comments-start) 0%, var(--gradient-comments-end) 100%);
}

.stat-card-commenters {
    background: linear-gradient(135deg, var(--gradient-commenters-start) 0%, var(--gradient-commenters-end) 100%);
}

.stat-card-approvals {
    background: linear-gradient(135deg, var(--gradient-approvals-start) 0%, var(--gradient-approvals-end) 100%);
}

.stat-card-approvers {
    background: linear-gradient(135deg, var(--gradient-approvers-start) 0%, var(--gradient-approvers-end) 100%);
}

/* ========================================
   Charts
   ======================================== */
.chart-container {
    margin: 20px 0;
    text-align: center;
}

.chart-container img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

/* ========================================
   Tables
   ======================================== */
.dev-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    font-size: 0.9em;
}

.dev-table th {
    background: var(--color-primary);
    color: var(--color-text-on-dark);
    padding: 8px 10px;
    text-align: left;
    font-weight: 600;
    font-size: 0.85em;
}

.dev-table td {
    padding: 8px 10px;
    border-bottom: 1px solid var(--color-border-light);
    color: var(--color-text-primary);
}

.dev-table tr:hover {
    background: var(--color-gray-50);
}

/* ========================================
   Trends
   ======================================== */
.trends-container {
    margin: 12px 0;
}

.trend-item {
    margin: 8px 0;
}

.trend-change {
    margin-left: 10px;
}

.trend-indicator {
    display: inline-block;
    padding: 5px 15px;
    border-radius: 20px;
    font-weight: bold;
    font-size: 0.9em;
    margin-left: 10px;
}

.trend-indicator.decreasing {
    background: var(--color-trend-decreasing-bg);
    color: var(--color-trend-decreasing-text);
}

.trend-indicator.increasing {
    background: var(--color-trend-increasing-bg);
    color: var(--color-trend-increasing-text);
}

/* ========================================
   Section Elements
   ======================================== */
.section-divider {
    margin: 40px 0;
    border: none;
    border-top: 2px solid var(--color-border-light);
}

.section-title {
    margin-top: 16px;
    color: var(--color-gray-700);
    font-size: 1em;
}

/* ========================================
   Filter Section
   ======================================== */
.filter-section {
    background: var(--color-surface);
    padding: 16px;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    margin-bottom: 16px;
}

.filter-section h3 {
    margin: 0 0 15px 0;
    font-size: 1.1em;
    color: var(--color-gray-800);
}

.filter-description {
    margin-bottom: 15px;
    color: var(--color-text-secondary);
    font-size: 0.9em;
}

.filter-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.filter-tag {
    background: var(--color-accent);
    color: var(--color-text-on-dark);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.9em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.filter-tag-remove {
    cursor: pointer;
    font-weight: bold;
    opacity: 0.8;
}

.filter-tag-remove:hover {
    opacity: 1;
}

.filter-input-group {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.filter-input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 0.9em;
    background: var(--color-surface);
    color: var(--color-text-primary);
}

.filter-button {
    padding: 8px 20px;
    background: var(--color-primary);
    color: var(--color-text-on-dark);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background 0.3s ease;
}

.filter-button:hover {
    background: var(--color-primary-dark);
}

.filter-info {
    margin-top: 10px;
    padding: 10px;
    background: var(--color-info-bg);
    border-left: 3px solid var(--color-info-border);
    font-size: 0.85em;
    color: var(--color-text-secondary);
}

/* ========================================
   Global Dev Stats
   ======================================== */
.global-dev-stats {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-gray-800) 100%);
    color: var(--color-text-on-dark);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-md);
}

.global-dev-stats h2 {
    color: var(--color-text-on-dark);
    border-left-color: var(--color-text-on-dark);
    margin-top: 0;
}

.global-dev-stats-subtitle {
    margin-bottom: 16px;
    opacity: 0.9;
    font-size: 0.9em;
}

/* ========================================
   Empty & Error States
   ======================================== */
.empty-state {
    padding: 60px 20px;
    text-align: center;
    color: var(--color-text-muted);
}

.empty-state-icon {
    font-size: 3em;
    margin-bottom: 20px;
}

.empty-state-title {
    color: var(--color-gray-400);
    margin-bottom: 10px;
}

.error-state {
    text-align: center;
}

.error-title {
    color: var(--color-accent);
    font-size: 1.5em;
    margin-bottom: 10px;
}

.error-message {
    color: var(--color-text-muted);
}

.error-help {
    color: var(--color-text-muted);
    margin-top: 20px;
}

/* ========================================
   PR Size & Links
   ======================================== */
.pr-size-small {
    color: var(--color-success);
    font-weight: bold;
}

.pr-size-medium {
    color: var(--color-warning);
    font-weight: bold;
}

.pr-size-large {
    color: var(--color-danger);
    font-weight: bold;
}

.pr-link {
    color: var(--color-primary);
    text-decoration: none;
}

.pr-link:hover {
    text-decoration: underline;
}

/* ========================================
   Theme Toggle Button
   ======================================== */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: all 0.2s ease;
}

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

.theme-toggle-icon {
    width: 16px;
    height: 16px;
    display: block;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .main-content {
        margin-left: 0;
        padding: 10px;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
}