:root {
    --page-bg: #0d0d0d;
    --page-text: #e8e8e8;
    --accent: #e206ff;
    --accent-soft: #b498f1;
    --yellow: #ffff00;
    --link: #c97aff;
    --link-hover: #e206ff;
    --border: #2a2a2a;
    --muted: #888;
    --section-bg: #111;
    --green: #39d353;
    --orange: #f0a030;
    --red: #e05050;
    --sidebar-w: 260px;
}

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

body {
    background: var(--page-bg);
    color: var(--page-text);
    font-family: 'Segoe UI', 'Helvetica Neue', sans-serif;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ── Header ── */
.site-header {
    padding: 16px 28px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: baseline;
    gap: 14px;
    flex-shrink: 0;
}

.site-header .org {
    font-size: 0.75rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.site-header .title {
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
}

.site-header .title span {
    color: var(--accent);
}

/* ── Split layout ── */
.layout {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ── Sidebar ── */
.sidebar {
    width: var(--sidebar-w);
    flex-shrink: 0;
    border-right: 1px solid var(--border);
    overflow-y: auto;
    padding: 16px 0;
    background: #0a0a0a;
}

.sidebar-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted);
    padding: 0 16px 10px;
}

.doc-entry {
    margin-bottom: 4px;
}

.doc-link {
    display: block;
    padding: 8px 16px;
    font-size: 0.87rem;
    color: var(--page-text);
    text-decoration: none;
    cursor: pointer;
    border-left: 3px solid transparent;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    line-height: 1.3;
}

.doc-link:hover {
    background: #161616;
    color: #fff;
}

.doc-link.active {
    border-left-color: var(--accent);
    background: #161616;
    color: #fff;
}

.addendum-list {
    display: none;
}

.addendum-list.open {
    display: block;
}

.addendum-link {
    display: block;
    padding: 5px 16px 5px 28px;
    font-size: 0.78rem;
    color: var(--muted);
    text-decoration: none;
    cursor: pointer;
    border-left: 3px solid transparent;
    transition: color 0.15s, background 0.15s;
}

.addendum-link:hover {
    color: var(--accent-soft);
    background: #161616;
}

.addendum-link.active {
    color: var(--accent-soft);
    border-left-color: var(--accent-soft);
}

/* ── Content panel ── */
.content-panel {
    flex: 1;
    overflow-y: auto;
    padding: 40px 48px 80px;
    max-width: 860px;
}

.content-panel:empty::after {
    content: 'Select a document from the sidebar.';
    color: var(--muted);
    font-size: 0.9rem;
}

/* ── Doc section rendered inside panel ── */
.doc-section {
    display: none;
}

.doc-section.visible {
    display: block;
}

.doc-header {
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.doc-header .doc-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
}

.doc-header .doc-title span {
    color: var(--accent);
}

.doc-header .doc-meta {
    font-size: 0.8rem;
    color: var(--muted);
    margin-top: 6px;
}

/* ── Addendum divider ── */
.addendum-block {
    margin-top: 56px;
    padding-top: 32px;
    border-top: 1px dashed var(--border);
}

.addendum-tag {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    background: var(--section-bg);
    color: var(--accent-soft);
    border: 1px solid var(--border);
    padding: 3px 12px;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 24px;
}

/* ── Inherited doc styles ── */
.content-panel h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 10px;
}

.content-panel .section-tag {
    font-size: 0.7rem;
    background: var(--accent);
    color: #000;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.content-panel h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--accent-soft);
    margin: 20px 0 8px;
}

.content-panel p {
    color: #c0c0c0;
    margin-bottom: 12px;
    font-size: 0.92rem;
    line-height: 1.7;
}

.content-panel ul {
    list-style: none;
    padding: 0;
    margin-bottom: 14px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.content-panel ul li {
    font-size: 0.91rem;
    color: #c0c0c0;
    padding-left: 18px;
    position: relative;
}

.content-panel ul li::before {
    content: '▸';
    color: var(--accent);
    position: absolute;
    left: 0;
    font-size: 0.8em;
    top: 2px;
}

.content-panel a {
    color: var(--link);
    text-decoration: none;
}

.content-panel a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

.content-panel .callout {
    background: var(--section-bg);
    border-left: 3px solid var(--accent);
    border-radius: 0 8px 8px 0;
    padding: 14px 18px;
    margin: 16px 0;
    font-size: 0.88rem;
    color: #b0b0b0;
}

.content-panel .callout.yellow {
    border-color: var(--yellow);
}

.content-panel .callout.green {
    border-color: var(--green);
}

.content-panel .callout.orange {
    border-color: var(--orange);
}

.content-panel .callout.red {
    border-color: var(--red);
}

.content-panel .callout strong {
    color: var(--accent-soft);
}

.content-panel .callout.yellow strong {
    color: var(--yellow);
}

.content-panel .callout.green strong {
    color: var(--green);
}

.content-panel .callout.orange strong {
    color: var(--orange);
}

.content-panel .callout.red strong {
    color: var(--red);
}

.content-panel .rule-list,
.content-panel .sw-grid,
.content-panel .exception-list,
.content-panel .branch-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 16px 0;
}

.content-panel .branch-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.content-panel .rule-card,
.content-panel .sw-card,
.content-panel .exception-item,
.content-panel .branch-card {
    background: var(--section-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 18px;
}

.content-panel .rule-card {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.content-panel .rule-card.must {
    border-left: 3px solid var(--green);
}

.content-panel .rule-card.must-not {
    border-left: 3px solid var(--red);
}

.content-panel .rule-card.affiliate {
    border-left: 3px solid var(--yellow);
}

.content-panel .exception-item {
    border-left: 3px solid var(--orange);
    border-radius: 0 8px 8px 0;
}

.content-panel .rule-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
    margin-top: 1px;
}

.content-panel .rule-title,
.content-panel .sw-title,
.content-panel .branch-name {
    font-weight: 600;
    color: #fff;
    font-size: 0.9rem;
    margin-bottom: 4px;
}

.content-panel .rule-card p,
.content-panel .sw-card p,
.content-panel .branch-desc {
    margin: 0;
    font-size: 0.84rem;
    color: var(--muted);
    line-height: 1.5;
}

.content-panel .sw-card {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.content-panel .sw-badge {
    font-size: 0.68rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 20px;
    white-space: nowrap;
    flex-shrink: 0;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 2px;
}

.content-panel .badge-foss {
    background: var(--green);
    color: #000;
}

.content-panel .badge-oss {
    background: var(--yellow);
    color: #000;
}

.content-panel .badge-npaase {
    background: var(--orange);
    color: #000;
}

.content-panel .badge-third {
    background: #555;
    color: #fff;
}

.content-panel .branch-email {
    font-family: 'Cascadia Code', 'Fira Code', monospace;
    font-size: 0.74rem;
    color: var(--accent-soft);
    word-break: break-all;
}

/* ── Empty state ── */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--muted);
    font-size: 0.9rem;
    gap: 8px;
}

.empty-state .icon {
    font-size: 2rem;
}

/* ── Scrollbar styling ── */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #2a2a2a;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #3a3a3a;
}

@media (max-width: 640px) {
    .layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border);
        max-height: 200px;
    }

    .content-panel {
        padding: 24px 20px 60px;
    }

    .content-panel .branch-grid {
        grid-template-columns: 1fr;
    }
}