.content-progress {
    position: fixed; top: 0; left: 0; right: 0; height: 3px;
    background: var(--color-border); z-index: 200; pointer-events: none;
}
.content-progress-bar {
    display: block; height: 100%;
    background: var(--color-accent);
    width: var(--progress-pct, 0%);
    transition: width 0.1s linear;
}
@media (prefers-reduced-motion: reduce) {
    .content-progress-bar { transition: none; }
}

.content-preview-bar {
    position: sticky; top: var(--topbar-h); z-index: 90;
    background: var(--color-warning-bg); color: var(--color-warning);
    border-bottom: 1px solid var(--color-warning-border);
    text-align: center; font-size: 13px; font-weight: 600;
    padding: 8px 24px;
}

.content-page {
    max-width: var(--max-wide); margin: 0 auto;
    padding: 32px 24px 64px; flex: 1;
}

.content-breadcrumbs {
    display: flex; align-items: center; gap: 6px;
    font-size: 14px; color: var(--color-text-muted);
    margin-bottom: 24px; flex-wrap: wrap;
}
.content-breadcrumbs a { color: var(--color-link); }
.content-breadcrumbs-sep { color: var(--color-text-muted); }
.content-breadcrumbs [aria-current="page"] { color: var(--color-text-muted); }

.content-layout {
    display: grid; grid-template-columns: 1fr;
    gap: 0; align-items: start;
}
@media (min-width: 1280px) {
    .content-layout { grid-template-columns: 1fr 220px; gap: 48px; }
}

.content-h1 {
    font-size: clamp(24px, 4vw, 34px); font-weight: 700; line-height: 1.25;
    margin-bottom: 32px; color: var(--color-text); letter-spacing: -0.01em;
}

.content-toc-collapsible {
    border: 1px solid var(--color-border); border-radius: var(--radius-md);
    margin-bottom: 32px; background: var(--color-surface); overflow: hidden;
}
.content-toc-collapsible summary {
    font-size: 14px; font-weight: 600; color: var(--color-text);
    padding: 12px 16px; cursor: pointer; list-style: none;
    display: flex; align-items: center; justify-content: space-between;
    user-select: none; min-height: 44px;
}
.content-toc-collapsible summary::-webkit-details-marker { display: none; }
.content-toc-collapsible summary::after {
    content: '\25BE'; color: var(--color-text-muted);
    transition: transform var(--transition);
}
.content-toc-collapsible[open] summary::after { transform: rotate(180deg); }
.content-toc-collapsible .content-toc { padding: 8px 16px 16px; }
@media (min-width: 1280px) { .content-toc-collapsible { display: none; } }

.content-toc-aside { display: none; }
@media (min-width: 1280px) {
    .content-toc-aside {
        display: block; position: sticky; top: 80px;
        max-height: calc(100vh - 100px); overflow-y: auto;
        border: 1px solid var(--color-border); border-radius: var(--radius-md);
        background: var(--color-surface); padding: 16px;
    }
}

.content-toc-label {
    font-size: 11px; font-weight: 600; text-transform: uppercase;
    letter-spacing: 0.07em; color: var(--color-text-muted);
    margin-bottom: 10px; display: block;
}
.content-toc ol, .content-toc ul { list-style: none; padding: 0; margin: 0; }
.content-toc li { display: block; }
.content-toc a {
    display: block; font-size: 13px; line-height: 1.4;
    color: var(--color-text-muted); text-decoration: none;
    padding: 4px 0 4px 8px; border-left: 2px solid transparent;
    transition: color var(--transition), border-color var(--transition);
}
.content-toc a:hover {
    color: var(--color-link); border-left-color: var(--color-accent);
    text-decoration: none;
}
.content-toc a.toc-h3 { padding-left: 20px; font-size: 12px; }
.content-toc a.toc-h4 { padding-left: 32px; font-size: 12px; }

.content-prose {
    max-width: var(--max-content); color: var(--color-text);
    line-height: 1.75; font-size: 16px;
}
.content-prose h2 {
    font-size: 22px; font-weight: 700; line-height: 1.3;
    margin: 40px 0 16px; padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text); scroll-margin-top: 80px;
}
.content-prose h3 {
    font-size: 18px; font-weight: 600; line-height: 1.35;
    margin: 32px 0 12px; color: var(--color-text); scroll-margin-top: 80px;
}
.content-prose h4 {
    font-size: 16px; font-weight: 600; line-height: 1.4;
    margin: 24px 0 8px; color: var(--color-text); scroll-margin-top: 80px;
}
.content-prose p { margin-bottom: 16px; }
.content-prose ul, .content-prose ol { margin: 0 0 16px 24px; }
.content-prose li { margin-bottom: 6px; }
.content-prose a { color: var(--color-link); text-decoration: underline; }
.content-prose a:hover { color: var(--color-link-hover); }
.content-prose blockquote {
    border-left: 3px solid var(--color-accent); margin: 24px 0;
    padding: 12px 20px; background: var(--color-accent-soft);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--color-text-muted); font-style: italic;
}
.content-prose code {
    font-family: var(--font-mono); font-size: 13px;
    background: var(--color-border); padding: 2px 6px;
    border-radius: 3px; word-break: break-word;
}
.content-prose pre {
    font-family: var(--font-mono); font-size: 13px;
    background: var(--bg-code); color: var(--code-text);
    padding: 20px; border-radius: var(--radius-md);
    overflow-x: auto; margin-bottom: 20px; line-height: 1.6;
}
.content-prose pre code { background: none; padding: 0; color: inherit; }
.content-prose table {
    width: 100%; border-collapse: collapse;
    margin-bottom: 20px; font-size: 14px;
}
.content-prose th, .content-prose td {
    text-align: left; padding: 10px 14px;
    border-bottom: 1px solid var(--color-border);
}
.content-prose th { font-weight: 600; background: var(--bg-tint); }
.content-prose tr:last-child td { border-bottom: none; }
.content-prose hr {
    border: none; border-top: 1px solid var(--color-border); margin: 32px 0;
}
.content-prose strong { font-weight: 600; }

.content-related {
    margin-top: 64px; padding-top: 32px;
    border-top: 1px solid var(--color-border);
    max-width: var(--max-wide);
}
.content-related-label {
    font-size: 18px; font-weight: 700;
    margin-bottom: 20px; color: var(--color-text);
}
.content-related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px;
}
.content-related-card {
    display: block; padding: 16px 20px; background: var(--color-surface);
    border: 1px solid var(--color-border); border-radius: var(--radius-md);
    text-decoration: none; color: var(--color-text);
    font-size: 14px; font-weight: 500; min-height: 44px;
    transition: border-color var(--transition), box-shadow var(--transition);
}
.content-related-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.12);
    text-decoration: none; color: var(--color-text);
}
.content-related-arrow {
    display: block; margin-top: 8px; font-size: 12px; color: var(--color-link);
}

.footer-content-links {
    display: flex; gap: 16px; flex-wrap: wrap; align-items: center;
}
.footer-content-links a {
    color: var(--color-text-muted); font-size: 14px; text-decoration: none;
}
.footer-content-links a:hover { color: var(--color-link); text-decoration: underline; }

.content-to-top {
    position: fixed; bottom: 32px; right: 32px;
    width: 44px; height: 44px; border-radius: 50%;
    background: var(--color-accent); color: #fff; border: none;
    font-size: 18px; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    transition: background var(--transition), transform var(--transition);
}
.content-to-top:hover {
    background: var(--color-accent-hover); transform: translateY(-2px);
}
.content-to-top:focus-visible {
    outline: 2px solid var(--color-accent); outline-offset: 3px;
}

@media (max-width: 768px) {
    .content-page { padding: 24px 16px 48px; }
    .content-h1 { font-size: 24px; margin-bottom: 24px; }
    .content-related-grid { grid-template-columns: 1fr 1fr; }
    .content-to-top { bottom: 20px; right: 16px; }
}
@media (max-width: 480px) {
    .content-page { padding: 16px 12px 40px; }
    .content-related-grid { grid-template-columns: 1fr; }
    .content-breadcrumbs { font-size: 13px; }
}