/* ============================================
   S2S Protocol Documentation Website
   Dark theme inspired by modelcontextprotocol.io
   ============================================ */

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #1c2129;
    --border: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --blue: #58a6ff;
    --green: #3fb950;
    --orange: #d29922;
    --red: #f85149;
    --purple: #bc8cff;
    --link: #58a6ff;
    --code-bg: #1c2129;
    --card-hover: #1f2937;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

/* ---- Nav ---- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    height: 64px;
    gap: 32px;
}

.nav-logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-logo .logo-icon {
    width: 32px;
    height: 32px;
    object-fit: contain;
    filter: invert(1);
}

.nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--text-primary);
    text-decoration: none;
}

.nav-right {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-github {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    padding: 6px 14px;
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 500;
    transition: border-color 0.2s;
}

.btn-github:hover {
    border-color: var(--text-secondary);
    text-decoration: none;
}

/* ---- Hero ---- */
.hero {
    padding: 140px 24px 80px;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    background: rgba(63, 185, 80, 0.1);
    border: 1px solid rgba(63, 185, 80, 0.3);
    color: var(--green);
    font-size: 13px;
    font-weight: 600;
    padding: 4px 14px;
    border-radius: 20px;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 52px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--blue) 50%, var(--green) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto 40px;
    line-height: 1.5;
}

.hero-diagram {
    display: block;
    max-width: 760px;
    width: 100%;
    height: auto;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border);
    margin: 40px auto 0;
    padding: 16px;
}

.how-diagram {
    display: block;
    max-width: 100%;
    height: auto;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border);
    margin: 0 auto;
    padding: 12px;
}

.hero-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 36px;
}

.btn-primary {
    background: var(--green);
    color: #0d1117;
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-primary:hover { opacity: 0.9; text-decoration: none; color: #0d1117; }

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: border-color 0.2s;
}

.btn-secondary:hover { border-color: var(--text-secondary); text-decoration: none; }

/* ---- Sections ---- */
.section {
    max-width: 1100px;
    margin: 0 auto;
    padding: 80px 24px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 48px;
    max-width: 600px;
}

/* ---- Stats bar ---- */
.stats-bar {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 40px 24px;
}

.stats-inner {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.stat-item .stat-value {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 4px;
}

.stat-item .stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ---- Feature cards ---- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    transition: border-color 0.2s, transform 0.2s;
}

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

.feature-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ---- Use cases ---- */
.usecase-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.usecase-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px 28px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.usecase-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.usecase-item h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.usecase-item p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ---- How it works ---- */
.how-image {
    max-width: 100%;
    border-radius: 12px;
    border: 1px solid var(--border);
    margin-top: 24px;
}

/* ---- Code block ---- */
.code-block {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px 24px;
    overflow-x: auto;
    margin: 20px 0;
}

.code-block pre {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-primary);
}

.code-block .comment { color: var(--text-muted); }
.code-block .keyword { color: var(--purple); }
.code-block .string { color: var(--green); }
.code-block .func { color: var(--blue); }
.code-block .decorator { color: var(--orange); }

/* ---- Card links (Start Building) ---- */
.card-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.card-link {
    display: block;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: border-color 0.2s, transform 0.2s;
}

.card-link:hover {
    border-color: var(--blue);
    transform: translateY(-2px);
    text-decoration: none;
}

.card-link-icon {
    font-size: 24px;
    margin-bottom: 12px;
}

.card-link h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

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

/* ---- Install block ---- */
.install-block {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0;
    max-width: 500px;
}

.install-block code {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--green);
}

.install-block .dollar {
    color: var(--text-muted);
}

/* ---- Footer ---- */
.footer {
    border-top: 1px solid var(--border);
    padding: 40px 24px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 13px;
}

.footer a { color: var(--text-secondary); }
.footer a:hover { color: var(--text-primary); }

/* ---- Doc pages ---- */
.doc-layout {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 24px 60px;
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 48px;
}

.sidebar {
    position: sticky;
    top: 80px;
    align-self: start;
}

.sidebar-section {
    margin-bottom: 24px;
}

.sidebar-section h4 {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.sidebar-section a {
    display: block;
    padding: 5px 12px;
    font-size: 14px;
    color: var(--text-secondary);
    border-radius: 6px;
    transition: background 0.15s, color 0.15s;
}

.sidebar-section a:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
    text-decoration: none;
}

.sidebar-section a.active {
    background: rgba(88, 166, 255, 0.1);
    color: var(--blue);
}

.sidebar-section a.sub {
    padding-left: 24px;
    font-size: 13px;
}

.doc-content {
    max-width: 760px;
}

.doc-content h1 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 8px;
}

.doc-content h2 {
    font-size: 24px;
    font-weight: 600;
    margin-top: 48px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

.doc-content h3 {
    font-size: 18px;
    font-weight: 600;
    margin-top: 32px;
    margin-bottom: 12px;
}

.doc-content p {
    margin-bottom: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.doc-content ul, .doc-content ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.doc-content li {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.doc-content strong {
    color: var(--text-primary);
}

.doc-content code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid var(--border);
}

.doc-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 14px;
}

.doc-content th {
    text-align: left;
    padding: 10px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    font-weight: 600;
    color: var(--text-primary);
}

.doc-content td {
    padding: 10px 16px;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

/* ---- Transfer modes section ---- */
.modes-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.mode-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    display: flex;
    flex-direction: column;
}

.mode-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.mode-header h3 {
    font-size: 22px;
    font-weight: 700;
}

.mode-badge {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: 999px;
    border: 1px solid transparent;
}

.mode-tagline {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.55;
    margin-bottom: 20px;
}

.mode-tagline strong {
    color: var(--text-primary);
}

.mode-diagram {
    width: 100%;
    height: auto;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px;
    margin-bottom: 20px;
}

.mode-list {
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.mode-list li {
    padding: 6px 0;
    border-top: 1px solid var(--border);
}

.mode-list li:first-child { border-top: none; }

.mode-list strong { color: var(--text-primary); font-weight: 600; }

.mode-compare {
    margin-top: 32px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.mode-compare-cell {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 18px 20px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.55;
}

.mode-compare-key {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.analogy-note {
    margin-top: 28px;
    background: linear-gradient(135deg, rgba(188,140,255,0.08), rgba(88,166,255,0.06));
    border: 1px solid rgba(188,140,255,0.35);
    border-left: 3px solid var(--purple);
    border-radius: 10px;
    padding: 20px 24px;
}

.analogy-title {
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--purple);
    margin-bottom: 8px;
}

.analogy-note p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
    max-width: 820px;
}

.analogy-note a { color: var(--blue); }

/* ---- S2SP vs Progressive Disclosure ---- */
.disclosure-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 28px;
}

.disclosure-axis {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 22px 24px;
}

.disclosure-axis-label {
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--purple);
    margin-bottom: 10px;
}

.disclosure-intro .disclosure-axis:last-child .disclosure-axis-label {
    color: var(--green);
}

.disclosure-axis-body {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
}

.disclosure-axis-body strong { color: var(--text-primary); }
.disclosure-axis-body a { color: var(--blue); }

.disclosure-formula {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 18px 22px;
    margin-bottom: 36px;
    text-align: center;
    overflow-x: auto;
}

.disclosure-formula code {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--text-primary);
    white-space: nowrap;
}

.disclosure-subtitle {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 14px;
    color: var(--text-primary);
}

.disclosure-table-wrap {
    overflow-x: auto;
    margin-bottom: 32px;
}

.disclosure-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    font-size: 14px;
}

.disclosure-table th,
.disclosure-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}

.disclosure-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 13px;
    letter-spacing: 0.02em;
}

.disclosure-table td {
    color: var(--text-secondary);
}

.disclosure-table tr:last-child td { border-bottom: none; }

.disclosure-table tr.highlight-row td {
    background: rgba(63,185,80,0.06);
    color: var(--text-primary);
}

.disclosure-table tr.highlight-row td:first-child {
    border-left: 3px solid var(--green);
}

.disclosure-table code {
    background: var(--bg-tertiary);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 12.5px;
}

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

.disclosure-takeaway {
    background: linear-gradient(135deg, rgba(63,185,80,0.08), rgba(88,166,255,0.06));
    border: 1px solid rgba(63,185,80,0.35);
    border-left: 3px solid var(--green);
    border-radius: 10px;
    padding: 22px 26px;
}

.disclosure-takeaway-title {
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--green);
    margin-bottom: 12px;
}

.disclosure-takeaway ul {
    margin: 0;
    padding-left: 20px;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

.disclosure-takeaway li { margin-bottom: 8px; }
.disclosure-takeaway li:last-child { margin-bottom: 0; }
.disclosure-takeaway strong { color: var(--text-primary); }
.disclosure-takeaway code {
    background: var(--bg-tertiary);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 13px;
}

/* ---- Two-layer naming intro ---- */
.nav-sub {
    font-size: inherit;
    font-weight: inherit;
    color: inherit;
    margin-left: 2px;
}

.twolayer-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 28px;
}

.twolayer-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
}

.twolayer-label {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.twolayer-card h3 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 4px;
    letter-spacing: -0.01em;
}

.twolayer-tagline {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 18px;
    font-style: italic;
}

.twolayer-list {
    list-style: none;
    padding: 0;
    margin: 0;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.65;
}

.twolayer-list li {
    padding: 8px 0 8px 20px;
    position: relative;
    border-top: 1px solid var(--border);
}

.twolayer-list li:first-child { border-top: none; padding-top: 0; }

.twolayer-list li:before {
    content: "\2192";
    position: absolute;
    left: 0;
    color: var(--text-muted);
}

.twolayer-list strong { color: var(--text-primary); }

.twolayer-list code {
    background: var(--bg-tertiary);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 12.5px;
}

/* ---- When-to-Use page ---- */
.persona-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 24px 0 40px;
}

.persona-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    flex-direction: column;
}

.persona-tag {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.persona-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.persona-lead {
    font-size: 14px;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 12px;
}

.persona-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 10px;
}

.persona-card ul {
    font-size: 13.5px;
    color: var(--text-secondary);
    padding-left: 20px;
    margin: 6px 0 12px;
    line-height: 1.55;
}

.persona-card ul li { margin-bottom: 6px; }

.persona-card strong { color: var(--text-primary); }

.persona-card code {
    background: var(--bg-tertiary);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 12.5px;
}

.fit-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 20px 0 32px;
}

.fit-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 22px 24px;
}

.fit-card h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.fit-card ul {
    font-size: 14px;
    color: var(--text-secondary);
    padding-left: 20px;
    margin: 0;
    line-height: 1.6;
}

.fit-card ul li { margin-bottom: 8px; }
.fit-card strong { color: var(--text-primary); }
.fit-card code {
    background: var(--bg-tertiary);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 12.5px;
}

.fit-yes { border-left: 3px solid var(--green); }
.fit-no { border-left: 3px solid var(--red); }
.fit-async { border-left: 3px solid var(--green); }
.fit-sync { border-left: 3px solid var(--blue); }

.fit-warning {
    background: rgba(210,153,34,0.08);
    border: 1px solid rgba(210,153,34,0.35);
    border-left: 3px solid var(--orange);
    border-radius: 10px;
    padding: 18px 22px;
    margin: 16px 0 32px;
}

.fit-warning-title {
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--orange);
    margin-bottom: 8px;
}

.fit-warning p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.fit-warning code {
    background: var(--bg-tertiary);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 12.5px;
}

.scenario {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 18px 22px;
    margin-bottom: 14px;
}

.scenario-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.scenario p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 10px;
}

.scenario-verdict {
    font-size: 13.5px;
    color: var(--text-secondary);
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border-left: 3px solid var(--green);
    border-radius: 4px;
}

.scenario-verdict strong { color: var(--text-primary); }

.scenario code {
    background: var(--bg-tertiary);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 12.5px;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .hero h1 { font-size: 32px; }
    .features-grid { grid-template-columns: 1fr; }
    .stats-inner { grid-template-columns: repeat(2, 1fr); }
    .card-links { grid-template-columns: 1fr; }
    .doc-layout { grid-template-columns: 1fr; }
    .sidebar { display: none; }
    .nav-links { display: none; }
    .modes-grid { grid-template-columns: 1fr; }
    .mode-compare { grid-template-columns: 1fr; }
    .disclosure-intro { grid-template-columns: 1fr; }
    .disclosure-formula code { white-space: normal; font-size: 12px; }
    .twolayer-grid { grid-template-columns: 1fr; }
    .persona-grid { grid-template-columns: 1fr; }
    .fit-grid { grid-template-columns: 1fr; }
}