:root {
    --bg: #0f1419;
    --surface: #1a1f26;
    --surface-hover: #232a33;
    --border: #2a333d;
    --text: #e6e9ee;
    --text-dim: #8892a0;
    --text-muted: #5c6673;
    --accent: #4a9eff;
    --accent-dim: #2d5a99;
    --red: #ff6b6b;
    --amber: #ffb84d;
    --green: #51cf66;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    --font-mono: "SF Mono", Monaco, Consolas, "Liberation Mono", monospace;
    --max-width: 1100px;
}

@media (prefers-color-scheme: light) {
    :root {
        --bg: #fafbfc;
        --surface: #ffffff;
        --surface-hover: #f4f6f9;
        --border: #e2e6eb;
        --text: #1f2937;
        --text-dim: #4b5563;
        --text-muted: #9ca3af;
        --accent: #2563eb;
        --accent-dim: #93c5fd;
        --red: #dc2626;
        --amber: #d97706;
        --green: #16a34a;
    }
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 20px 24px 16px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 24px;
    flex-wrap: wrap;
}

.brand h1 {
    margin: 0;
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.subtitle {
    color: var(--text-dim);
    font-size: 13px;
    margin-top: 2px;
}

.meta {
    text-align: right;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-dim);
}

.last-sync { font-weight: 500; }
.sources { margin-top: 3px; color: var(--text-muted); font-size: 11px; }

.tabs {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    gap: 4px;
    overflow-x: auto;
}

.tab {
    background: transparent;
    border: none;
    color: var(--text-dim);
    padding: 12px 18px;
    font-size: 14px;
    font-family: inherit;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color 0.15s, border-color 0.15s;
    white-space: nowrap;
}

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

.tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 32px 24px 60px;
}

.pane { display: none; }
.pane.active { display: block; animation: fadeIn 0.15s ease-out; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.loading, .error {
    padding: 40px;
    text-align: center;
    color: var(--text-dim);
    font-size: 14px;
}

.error {
    color: var(--red);
    background: var(--surface);
    border-radius: 8px;
    margin-top: 20px;
}

.pane h1 {
    font-size: 26px;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 8px;
    letter-spacing: -0.015em;
}

.pane h2 {
    font-size: 18px;
    font-weight: 600;
    margin-top: 32px;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
    letter-spacing: -0.01em;
}

.pane h3 {
    font-size: 15px;
    font-weight: 600;
    margin-top: 22px;
    margin-bottom: 8px;
    color: var(--text);
}

.pane h1 + p em,
.pane h1 + p em + em {
    font-style: normal;
    color: var(--text-muted);
    font-size: 12px;
    font-family: var(--font-mono);
}

.pane p em {
    color: var(--text-dim);
}

.pane p, .pane li { color: var(--text); font-size: 14px; }
.pane li { margin: 4px 0; }
.pane ul, .pane ol { padding-left: 22px; }

.pane strong { color: var(--text); font-weight: 600; }

.pane a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.15s;
}
.pane a:hover { border-bottom-color: var(--accent); }

.pane code {
    background: var(--surface);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--accent);
}

.pane blockquote {
    border-left: 3px solid var(--accent-dim);
    padding: 4px 16px;
    margin: 16px 0;
    color: var(--text-dim);
    background: var(--surface);
    border-radius: 0 6px 6px 0;
}

.pane table {
    border-collapse: collapse;
    width: 100%;
    margin: 16px 0;
    font-size: 13px;
}
.pane th, .pane td {
    text-align: left;
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
}
.pane th {
    background: var(--surface);
    font-weight: 600;
    color: var(--text-dim);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.pane hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 28px 0;
}

footer {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 24px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 12px;
    display: flex;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

@media (max-width: 640px) {
    .header-inner { padding: 16px; }
    .brand h1 { font-size: 18px; }
    .meta { text-align: left; }
    .tabs { padding: 0 16px; }
    .tab { padding: 10px 12px; font-size: 13px; }
    main { padding: 24px 16px 40px; }
    footer { padding: 16px; flex-direction: column; }
}