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

/* Theme variables */
:root {
    --bg-primary: #0f1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #1c2128;
    --bg-input: #0d1117;
    --border: #30363d;
    --border-hover: #58a6ff;
    --text-primary: #f0f6fc;
    --text-secondary: #c9d1d9;
    --text-muted: #8b949e;
    --text-faint: #484f58;
    --accent: #58a6ff;
    --accent-orange: #f78166;
    --green: #3fb950;
    --red: #f85149;
    --yellow: #d29922;
    --badge-bg: #1f2428;
    --badge-border: #1f6feb33;
    --shadow: rgba(0,0,0,0.4);
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #f0f2f5;
    --bg-input: #ffffff;
    --border: #d0d7de;
    --border-hover: #0969da;
    --text-primary: #1f2328;
    --text-secondary: #424a53;
    --text-muted: #656d76;
    --text-faint: #8b949e;
    --accent: #0969da;
    --accent-orange: #cf222e;
    --green: #1a7f37;
    --red: #cf222e;
    --yellow: #9a6700;
    --badge-bg: #f0f2f5;
    --badge-border: #0969da33;
    --shadow: rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-secondary);
    min-height: 100vh;
    transition: background 0.2s, color 0.2s;
}

header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 24px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.header-content h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

.subtitle {
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 4px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.last-refresh {
    color: var(--text-muted);
    font-size: 12px;
}

/* Theme toggle */
.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 6px 10px;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    transition: border-color 0.2s;
}

.theme-toggle:hover {
    border-color: var(--border-hover);
}

nav {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0 32px;
    display: flex;
    gap: 0;
}

nav a {
    color: var(--text-muted);
    text-decoration: none;
    padding: 12px 16px;
    font-size: 14px;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

nav a:hover {
    color: var(--text-primary);
}

nav a.active {
    color: var(--text-primary);
    border-bottom-color: var(--accent-orange);
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px;
}

.section-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
    margin-top: 32px;
}

.section-title:first-child {
    margin-top: 0;
}

.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    margin-bottom: 16px;
}

.kpi-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    transition: border-color 0.2s;
}

.kpi-card:hover {
    border-color: var(--border-hover);
}

.kpi-card .label {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-weight: 500;
}

.kpi-card .value {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.1;
}

.kpi-card .change {
    font-size: 14px;
    font-weight: 500;
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 4px;
}

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

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

.kpi-card .change.neutral {
    color: var(--text-muted);
}

.kpi-card .meta {
    font-size: 11px;
    color: var(--text-faint);
    margin-top: 12px;
    display: flex;
    justify-content: space-between;
}

.kpi-card .source-badge {
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
    font-weight: 500;
}

.kpi-card .source-badge.github {
    background: var(--badge-bg);
    color: var(--accent);
    border: 1px solid var(--badge-border);
}

.kpi-card .source-badge.manual {
    background: var(--badge-bg);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

/* Documentation grid */
.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}

.doc-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.2s, transform 0.2s;
}

.doc-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.doc-icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.doc-card h3 {
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.doc-card p {
    font-size: 13px;
    color: var(--text-muted);
}

/* Tooltip */
.kpi-card.has-tooltip {
    position: relative;
}

.kpi-tooltip {
    display: none;
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-tertiary);
    border: 1px solid var(--accent);
    border-radius: 6px;
    padding: 10px 14px;
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
    width: 300px;
    z-index: 10;
    box-shadow: 0 4px 12px var(--shadow);
    pointer-events: none;
}

.kpi-card.has-tooltip:hover .kpi-tooltip {
    display: block;
}

/* Loading state */
.loading {
    color: var(--text-muted);
    font-style: italic;
}

@media (max-width: 768px) {
    header {
        padding: 16px;
    }
    main {
        padding: 16px;
    }
    .kpi-grid {
        grid-template-columns: 1fr;
    }
}