:root {
    --primary-color: #0366d6;
    --secondary-color: #586069;
    --success-color: #28a745;
    --danger-color: #d73a49;
    --warning-color: #ffd33d;
    --background-color: #f6f8fa;
    --card-background: #ffffff;
    --border-color: #e1e4e8;
    --text-primary: #24292e;
    --text-secondary: #586069;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-hover: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.23);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    margin-bottom: 2rem;
    padding: 2rem 0;
    background: linear-gradient(135deg, var(--primary-color), #4f46e5);
    color: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.nav-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    background: var(--card-background);
    padding: 0.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow-x: auto;
}

.tab-btn {
    flex: 1;
    padding: 0.75rem 1.5rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.tab-btn.active {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 2px 4px rgba(3, 102, 214, 0.3);
}

.main-content {
    position: relative;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

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

.loading {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error {
    text-align: center;
    padding: 2rem;
    background-color: #ffeaea;
    border: 1px solid var(--danger-color);
    border-radius: 8px;
    color: var(--danger-color);
    margin-bottom: 1rem;
}

.error i {
    font-size: 2rem;
    margin-bottom: 1rem;
    display: block;
}

.profile-card {
    background: var(--card-background);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: center;
}

.profile-avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    box-shadow: var(--shadow);
}

.profile-info {
    flex: 1;
    min-width: 300px;
}

.profile-name {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.profile-username {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.profile-bio {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.profile-stats {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.search-bar {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.search-bar input,
.search-bar select {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.search-bar input {
    flex: 1;
    min-width: 250px;
}

.search-bar input:focus,
.search-bar select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.repos-grid,
.users-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.repo-card,
.user-card {
    background: var(--card-background);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.repo-card:hover,
.user-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.repo-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.repo-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    flex: 1;
}

.repo-name:hover {
    text-decoration: underline;
}

.repo-private {
    background: var(--warning-color);
    color: #000;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.repo-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.repo-stats {
    display: flex;
    gap: 1rem;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.repo-stat {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.language-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
}

.user-card {
    text-align: center;
}

.user-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 1rem;
    display: block;
    box-shadow: var(--shadow);
}

.user-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.user-username {
    color: var(--text-secondary);
    text-decoration: none;
}

.user-username:hover {
    color: var(--primary-color);
}

.events-list {
    background: var(--card-background);
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.event-item {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.event-item:last-child {
    border-bottom: none;
}

.event-icon {
    width: 32px;
    height: 32px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.8rem;
    flex-shrink: 0;
}

.event-content {
    flex: 1;
}

.event-description {
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.event-meta {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.event-repo {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.event-repo:hover {
    text-decoration: underline;
}

/* Treemap Styles - Finviz.com inspired */
.treemap-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1rem 1.5rem;
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    flex-wrap: wrap;
}

.treemap-controls label {
    font-weight: 600;
    color: #212529;
    font-size: 0.95rem;
}

.metric-buttons {
    display: flex;
    gap: 0.25rem;
    flex-wrap: wrap;
}

.metric-btn {
    padding: 0.4rem 0.8rem;
    border: 1px solid #dee2e6;
    border-radius: 3px;
    background: #ffffff;
    color: #495057;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    min-width: 70px;
    text-align: center;
}

.metric-btn:hover {
    background: #e9ecef;
    border-color: #adb5bd;
}

.metric-btn.active {
    background: #007bff;
    color: white;
    border-color: #007bff;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.15);
}

.treemap-container {
    background: #ffffff;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    padding: 0;
    position: relative;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

#treemap-chart {
    width: 100%;
    height: 600px;
    overflow: hidden;
    background: #ffffff;
}

/* Finviz-style treemap nodes */
.treemap-node {
    stroke: #ffffff;
    stroke-width: 1px;
    cursor: pointer;
    transition: all 0.15s ease;
    filter: brightness(1);
}

.treemap-node:hover {
    stroke: #ffffff;
    stroke-width: 1px;
    filter: brightness(1.15);
}

/* Owner group containers */
.treemap-owner-container {
    stroke: #333333;
    stroke-width: 1.5px;
    fill: none;
    opacity: 0.6;
}

/* Owner header backgrounds - subtle and flat */
.treemap-owner-header-bg {
    stroke: #ffffff;
    stroke-width: 1px;
    opacity: 0.3;
}

/* Large, bold, left-aligned owner headers */
.treemap-owner-header {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 14px;
    font-weight: 400;
    fill: #000000;
    text-anchor: start;
    dominant-baseline: central;
    cursor: pointer;
    pointer-events: none;
}

/* Repo text with value - same size as headers */
.treemap-repo-text {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 14px;
    font-weight: 400;
    fill: #000000;
    text-anchor: start;
    dominant-baseline: central;
    cursor: pointer;
    pointer-events: none;
}

/* Language labels - minimal and unobtrusive */
.treemap-language-text {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 9px;
    font-weight: 300;
    fill: #333333;
    text-anchor: start;
    dominant-baseline: central;
    cursor: pointer;
    pointer-events: none;
}

/* Finviz-style tooltip - appears at lower right of cursor */
.treemap-tooltip {
    position: fixed;
    background: #1a1a1a;
    color: #ffffff;
    padding: 0.75rem 1rem;
    border-radius: 4px;
    font-size: 0.85rem;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    pointer-events: none;
    z-index: 1000;
    max-width: 280px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
    border: 1px solid #444444;
    opacity: 0;
    transition: opacity 0.2s ease;
    transform: translate(15px, 10px); /* Lower right positioning */
}

.treemap-tooltip.visible {
    opacity: 1;
}

.tooltip-repo-name {
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #ffffff;
    font-size: 0.95rem;
}

.tooltip-metric {
    font-size: 1rem;
    font-weight: 600;
    color: #17a2b8;
    margin-bottom: 0.4rem;
}

.tooltip-description {
    font-size: 0.8rem;
    line-height: 1.3;
    opacity: 0.85;
    margin-top: 0.5rem;
    color: #cccccc;
}

/* Responsive treemap */
@media (max-width: 768px) {
    #treemap-chart {
        height: 400px;
    }
    
    .treemap-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }
    
    .metric-buttons {
        justify-content: center;
    }
    
    .metric-btn {
        padding: 0.35rem 0.7rem;
        font-size: 0.8rem;
        min-width: 60px;
    }
    
    .treemap-owner-header {
        font-size: 12px;
    }
    
    .treemap-repo-text {
        font-size: 12px;
    }
    
    .treemap-language-text {
        font-size: 8px;
    }
}

/* Enhanced language colors for treemap - Finviz-style vibrant palette */
.lang-javascript { fill: #F7DF1E; }
.lang-typescript { fill: #3178C6; }
.lang-python { fill: #306998; }
.lang-java { fill: #ED8B00; }
.lang-html { fill: #E34F26; }
.lang-css { fill: #1572B6; }
.lang-php { fill: #777BB4; }
.lang-ruby { fill: #CC342D; }
.lang-go { fill: #00ADD8; }
.lang-rust { fill: #DEA584; }
.lang-swift { fill: #FA7343; }
.lang-kotlin { fill: #7F52FF; }
.lang-dart { fill: #0175C2; }
.lang-shell { fill: #89E051; }
.lang-c { fill: #A8B9CC; }
.lang-cpp { fill: #00599C; }
.lang-csharp { fill: #239120; }
.lang-vue { fill: #4FC08D; }
.lang-react { fill: #61DAFB; }
.lang-r { fill: #276DC3; }
.lang-matlab { fill: #E16737; }
.lang-scala { fill: #DC322F; }
.lang-perl { fill: #39457E; }
.lang-lua { fill: #000080; }
.lang-haskell { fill: #5D4F85; }
.lang-clojure { fill: #5881D8; }
.lang-elixir { fill: #6E4A7E; }
.lang-erlang { fill: #B83998; }
.lang-fsharp { fill: #378BBA; }
.lang-ocaml { fill: #3BE133; }
.lang-default { fill: #666666; }