:root {
    --bg: #ffffff;
    --bg-subtle: #f6f8fa;
    --border: #d1d9e0;
    --fg: #1f2328;
    --fg-muted: #59636e;
    --accent: #0969da;
    --accent-fg: #ffffff;
    --success: #1a7f37;
    --danger: #d1242f;
    --code-bg: #f6f8fa;
    --shadow: 0 1px 0 rgba(31, 35, 40, 0.04);
    --radius: 6px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0d1117;
        --bg-subtle: #161b22;
        --border: #30363d;
        --fg: #e6edf3;
        --fg-muted: #8d96a0;
        --accent: #4493f8;
        --accent-fg: #0d1117;
        --success: #3fb950;
        --danger: #f85149;
        --code-bg: #161b22;
        --shadow: none;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.muted { color: var(--fg-muted); }
.small { font-size: 12px; }

/* Header */
.site-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
}
.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--fg);
    font-weight: 600;
    font-size: 15px;
    flex-shrink: 0;
}
.brand:hover { text-decoration: none; }
.global-search { flex: 1; max-width: 480px; }
.global-search input {
    width: 100%;
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-subtle);
    color: var(--fg);
    font-size: 14px;
}
.global-search input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.icon-button {
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--fg);
    width: 32px;
    height: 32px;
    cursor: pointer;
    font-size: 15px;
}
.icon-button:hover { background: var(--bg-subtle); }

/* Nav */
.site-nav {
    display: flex;
    gap: 4px;
    padding: 0 20px;
    border-bottom: 1px solid var(--border);
}
.nav-link {
    padding: 10px 12px;
    color: var(--fg-muted);
    font-weight: 500;
    border-bottom: 2px solid transparent;
}
.nav-link:hover { color: var(--fg); text-decoration: none; }
.nav-link.active { color: var(--fg); border-bottom-color: var(--accent); }

/* Settings panel */
.settings-panel {
    max-width: 480px;
    margin: 16px 20px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-subtle);
}
.settings-panel label { display: block; font-weight: 600; margin-bottom: 6px; }
.settings-panel input {
    width: 100%;
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font-mono);
    margin-bottom: 10px;
}
.settings-actions { display: flex; gap: 8px; margin-bottom: 8px; }
.settings-divider { border: none; border-top: 1px solid var(--border); margin: 16px 0; }
.settings-panel select {
    width: 100%;
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--fg);
    margin-bottom: 10px;
}

/* AI explain */
.explain-box {
    margin: 4px 0 20px;
    padding: 16px;
    border: 1px solid var(--accent);
    border-radius: var(--radius);
    background: color-mix(in srgb, var(--accent) 6%, var(--bg));
}
.explain-box h4 { margin: 0 0 8px; font-size: 13px; color: var(--accent); }
.explain-box .markdown p:first-child { margin-top: 0; }
.explain-box .markdown p:last-child { margin-bottom: 0; }
.markdown { line-height: 1.6; }
.markdown h1, .markdown h2, .markdown h3 { margin-top: 20px; margin-bottom: 8px; }
.markdown h1 { font-size: 20px; }
.markdown h2 { font-size: 17px; }
.markdown h3 { font-size: 15px; }
.markdown pre {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px;
    overflow-x: auto;
    font-size: 12px;
}
.markdown code { font-family: var(--font-mono); font-size: 0.9em; background: var(--code-bg); padding: 1px 4px; border-radius: 4px; }
.markdown pre code { background: none; padding: 0; }
.markdown img { max-width: 100%; }
.markdown table { border-collapse: collapse; margin: 12px 0; }
.markdown th, .markdown td { border: 1px solid var(--border); padding: 6px 10px; }
.readme-preview { max-height: 600px; overflow: auto; padding: 16px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); }

.btn {
    padding: 5px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-subtle);
    color: var(--fg);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
}
.btn:hover { background: var(--border); }
.btn-primary { background: var(--success); border-color: var(--success); color: #fff; }
.btn-primary:hover { filter: brightness(1.1); }

/* Main content */
#app {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    min-height: 60vh;
}

.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}
.filters input, .filters select {
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--fg);
    font-size: 13px;
}
.filters input[type="text"], .filters input[type="search"] { flex: 1; min-width: 200px; }
.repo-jump {
    align-items: center;
    padding-top: 16px;
    margin-top: -4px;
    border-top: 1px dashed var(--border);
}
.repo-jump span { flex-basis: 100%; }

.result-count { color: var(--fg-muted); margin-bottom: 12px; font-size: 13px; }

/* Repo card */
.repo-list { display: flex; flex-direction: column; }
.repo-card {
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}
.repo-card:last-child { border-bottom: none; }
.repo-card h3 { margin: 0 0 4px; font-size: 16px; }
.repo-card p.desc { margin: 4px 0 8px; color: var(--fg); }
.repo-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    color: var(--fg-muted);
    font-size: 12px;
}
.repo-meta span { display: inline-flex; align-items: center; gap: 4px; }
.lang-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); display: inline-block; }
.topics { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.topic-pill {
    background: color-mix(in srgb, var(--accent) 15%, transparent);
    color: var(--accent);
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 500;
}
.badge {
    font-size: 11px;
    font-weight: 600;
    padding: 1px 8px;
    border-radius: 999px;
    border: 1px solid var(--danger);
    color: var(--danger);
    margin-left: 6px;
}

/* Repo detail */
.repo-header h1 { margin: 0 0 4px; font-size: 22px; }
.repo-header .desc { color: var(--fg-muted); margin-bottom: 14px; }
.stat-row {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    margin-bottom: 18px;
    font-size: 13px;
}
.stat-row strong { color: var(--fg); }
.lang-bar {
    display: flex;
    height: 8px;
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: 6px;
    background: var(--bg-subtle);
}
.lang-bar-segment { height: 100%; }
.lang-legend { display: flex; flex-wrap: wrap; gap: 12px; font-size: 12px; color: var(--fg-muted); margin-bottom: 18px; }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 16px; }
.tab-btn {
    padding: 8px 14px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--fg-muted);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
}
.tab-btn:hover { color: var(--fg); }
.tab-btn.active { color: var(--fg); border-bottom-color: var(--accent); }


.file-list { list-style: none; margin: 0; padding: 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.file-list li {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
}
.file-list li:last-child { border-bottom: none; }
.file-list li:hover { background: var(--bg-subtle); }
.file-list .size { margin-left: auto; color: var(--fg-muted); font-size: 12px; }
.breadcrumbs { margin-bottom: 12px; font-size: 13px; }
.breadcrumbs a { margin-right: 2px; }

.code-view {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    overflow: auto;
    max-height: 600px;
}
.code-view pre { margin: 0; font-family: var(--font-mono); font-size: 12px; white-space: pre-wrap; word-break: break-word; }

.commit-list, .branch-list { list-style: none; margin: 0; padding: 0; }
.commit-list li, .branch-list li {
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    gap: 10px;
    align-items: baseline;
    font-size: 13px;
}
.sha { font-family: var(--font-mono); color: var(--fg-muted); font-size: 12px; }

/* Compare */
.compare-input { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.compare-input input { flex: 1; min-width: 220px; }
table.compare-table { width: 100%; border-collapse: collapse; font-size: 13px; }
table.compare-table th, table.compare-table td {
    text-align: left;
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}
table.compare-table th { color: var(--fg-muted); font-weight: 600; }
.table-scroll { overflow-x: auto; }

/* States */
.state-message { padding: 40px 20px; text-align: center; color: var(--fg-muted); }
.state-message.error { color: var(--danger); }
.spinner {
    width: 20px; height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    margin: 0 auto 10px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.site-footer {
    text-align: center;
    padding: 24px;
    color: var(--fg-muted);
    font-size: 12px;
    border-top: 1px solid var(--border);
}

@media (max-width: 640px) {
    .site-header { flex-wrap: wrap; }
    .global-search { order: 3; max-width: none; width: 100%; }
}