@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Roboto+Mono:wght@400;500&family=Roboto:wght@400;500&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200&icon_names=arrow_back,arrow_forward');

:root {
    --amd-red: #ed1c24;
    --amd-red-hover: #ff3333;
    --content-bg: #fafdff;
    --body-bg: #c4cbce;
    --text-color: #333333;
    --text-muted: #6b7280;
    --border-color: #e1e4e8;
    --code-bg: #ffffff;
    --code-color: #e74c3c;
    --pre-bg: #2d2d2d;
    --sidebar-bg: #000000;
    --sidebar-width: 300px;
}

[data-theme="dark"] {
    --content-bg: #16161a;
    --body-bg: #0d1117;
    --text-color: #c9d1d9;
    --text-muted: #8b949e;
    --border-color: #30363d;
    --code-bg: #1e1e1e;
    --code-color: #ff8080;
    --pre-bg: #1e1e1e;
    --sidebar-bg: #0d1117;
}

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

[id] {
    scroll-margin-top: 100px;
}

strong, b {
    font-weight: 600;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif !important;
    font-weight: 400 !important;
    font-size: 16px !important;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--body-bg);
}

/* Fixed Header */
.fixed-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: #000000;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    z-index: 2000;
    display: flex;
    align-items: center;
    padding: 0 80px 0 20px;
}

.fixed-header h1 {
    font-size: 1.4rem;
    font-weight: 500;
    color: #ffffff;
    margin: 0;
    padding: 0;
    border: none;
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 80px;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    z-index: 1000;
    transition: background-color 0.2s, border-color 0.2s;
}

.sidebar-title {
    padding: 16px 20px 8px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.45);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .sidebar-title {
    color: #8b949e;
    border-bottom-color: var(--border-color);
}

.sidebar-title a {
    color: rgba(255, 255, 255, 0.45);
    text-decoration: none;
    transition: color 0.2s;
}

[data-theme="dark"] .sidebar-title a {
    color: #8b949e;
}

.sidebar-title a:hover {
    color: var(--amd-red);
}

.sidebar-nav {
    list-style: none;
    padding: 20px 0;
    margin: 0;
}

.sidebar-nav li {
    margin: 0;
}

.sidebar-nav a {
    display: block;
    padding: 12px 20px;
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    border-left: 3px solid transparent;
    transition: all 0.2s;
    font-size: 0.9rem;
}

[data-theme="dark"] .sidebar-nav a {
    color: #c9d1d9;
}

.sidebar-nav a:hover {
    background: rgba(255, 255, 255, 0.1);
    border-left-color: transparent;
    color: #ffffff;
}

[data-theme="dark"] .sidebar-nav a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.sidebar-nav a.active {
    background: rgba(255, 255, 255, 0.15);
    border-left-color: transparent;
    color: #ffffff;
    font-weight: 500;
}

[data-theme="dark"] .sidebar-nav a.active {
    background: rgba(255, 255, 255, 0.15);
}

/* Main Content */
.content {
    margin-left: var(--sidebar-width);
    margin-top: 80px;
    padding: 40px 60px 120px;
    background: var(--content-bg);
    min-height: calc(100vh - 80px);
    transition: background-color 0.2s, margin-left 0.3s;
}

/* ===== Table of Contents Page ===== */
.toc-page {
    padding: 0 0 120px !important;
}

/* Hero */
.toc-hero {
    position: relative;
    background: #1a1a1a;
    color: #fff;
    padding: 56px 60px 48px;
    overflow: hidden;
    border-bottom: 3px solid var(--amd-red);
}

[data-theme="dark"] .toc-hero {
    background: #0d1117;
    border-bottom-color: var(--amd-red);
}

.toc-hero-accent {
    display: none;
}

.toc-hero-content {
    position: relative;
    z-index: 1;
}

.toc-hero-badge {
    display: inline-block;
    background: rgba(237,28,36,0.15);
    border: 1px solid rgba(237,28,36,0.4);
    color: #ff6b6b;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.toc-hero-title {
    font-size: 2.4rem;
    font-weight: 600;
    margin-bottom: 12px;
    border: none;
    padding: 0;
    color: #fff !important;
}

.toc-hero-subtitle {
    font-size: 1.05rem;
    color: #b0b0b0;
    max-width: 680px;
    line-height: 1.7;
    margin-bottom: 12px;
}

[data-theme="dark"] .toc-hero-subtitle {
    color: var(--text-muted);
}

.toc-hero-stats {
    display: flex;
    gap: 40px;
}

.toc-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.toc-stat-num {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--amd-red);
    line-height: 1;
}

.toc-stat-label {
    font-size: 0.75rem;
    color: #718096;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 4px;
}

/* Card Grid */
.toc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    padding: 32px 60px 0;
}

.toc-card {
    position: relative;
    display: block;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 28px 24px 24px;
    text-decoration: none;
    color: var(--text-color);
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s, background-color 0.2s;
}

[data-theme="dark"] .toc-card {
    background: #21262d;
}

.toc-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(237,28,36,0.12);
    border-color: var(--amd-red);
}

[data-theme="dark"] .toc-card:hover {
    box-shadow: 0 8px 24px rgba(237,28,36,0.2);
}

.toc-card-icon {
    font-size: 1.6rem;
    margin-bottom: 8px;
    opacity: 0.7;
}

.toc-card-step {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.toc-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-color);
}

.toc-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-card li {
    position: relative;
    padding: 3px 0 3px 16px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.toc-card li::before {
    content: '\2022';
    position: absolute;
    left: 0;
    color: var(--text-muted);
    opacity: 0.6;
}

.toc-card-arrow {
    position: absolute;
    bottom: 16px;
    right: 20px;
    font-family: 'Material Symbols Outlined';
    font-weight: normal;
    font-style: normal;
    font-size: 1.3rem;
    line-height: 1;
    letter-spacing: normal;
    text-transform: none;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    color: var(--border-color);
    transition: color 0.2s, transform 0.2s;
}

.toc-card:hover .toc-card-arrow {
    color: var(--amd-red);
    transform: translateX(4px);
}

/* Callout */
.toc-callout {
    margin: 32px 60px 0;
    padding: 20px 24px;
    background: rgba(237,28,36,0.04);
    border-left: 4px solid var(--amd-red);
    border-radius: 0 8px 8px 0;
    font-size: 0.92rem;
    color: var(--text-color);
    line-height: 1.7;
}

[data-theme="dark"] .toc-callout {
    background: rgba(237,28,36,0.1);
}

.toc-callout a {
    color: var(--amd-red);
    font-weight: 500;
    text-decoration: none;
}

.toc-callout a:hover {
    text-decoration: underline;
}

h1, .rst-content h1 {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif !important;
    font-weight: 500 !important;
    font-size: 2.2rem;
    color: var(--text-color);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

h2, .rst-content h2 {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif !important;
    font-weight: 500 !important;
    font-size: 1.6rem;
    color: var(--text-color);
    margin: 32px 0 16px;
}

h3, .rst-content h3 {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif !important;
    font-weight: 500 !important;
    font-size: 1.25rem;
    color: var(--text-color);
    margin: 24px 0 12px;
}

h4, .rst-content h4,
h5, .rst-content h5,
h6, .rst-content h6 {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif !important;
    font-weight: 400 !important;
    color: var(--text-color);
    margin: 20px 0 10px;
}

.content h1,
.content h2,
.content h3,
.content h4,
.content h5,
.content h6 {
    color: #000000;
}

p { margin: 12px 0; }
ul, ol { margin: 12px 0 12px 24px; }
li { margin: 6px 0; }

a { 
    color: var(--amd-red);
    text-decoration: none; 
}

a:hover { 
    text-decoration: underline; 
}

/* Content area links match software docs: hover goes to black */
.content a:hover {
    color: #000000;
    text-decoration: none;
}

code, tt {
    font-family: 'Roboto Mono', 'Cascadia Code', 'Ubuntu Mono', 'DejaVu Sans Mono' ,'Menlo', monospace !important;
    font-weight: 400 !important;
    font-size: 15px !important;
    background: var(--code-bg);
    padding: 2px 5px;
    border-radius: 4px;
    border: 1px solid #e1e4e5;
    color: var(--code-color);
}

pre {
    background: var(--pre-bg);
    color: #f8f8f2;
    padding: 16px 20px;
    border-radius: 4px;
    overflow-x: auto;
    margin: 16px 0;
    font-size: 15px;
    line-height: 1.5;
    border: 1px solid var(--border-color);
}

[data-theme="dark"] pre {
    color: #c9d1d9;
}

pre code, pre tt {
    background: none;
    padding: 0;
    color: inherit;
    border: none;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14px;
    border: 1px solid var(--border-color);
}

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

th {
    background: #f0f0f0;
    font-weight: 600;
    color: var(--text-color);
}

[data-theme="dark"] th {
    background: #21262d;
}

tr:nth-child(even) { background: #fafbfc; }

[data-theme="dark"] tr:nth-child(even) {
    background: #1c2128;
}

/* Flag difference tables */
.flag-diff {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid var(--border-color);
    margin: 12px 0;
}

.flag-diff th {
    background: #f0f0f0;
    font-weight: 600;
    color: var(--text-color);
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    font-size: 0.9rem;
}

[data-theme="dark"] .flag-diff th {
    background: #21262d;
}

.flag-diff td {
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    font-size: 0.9rem;
    vertical-align: top;
    background: #fff;
}

[data-theme="dark"] .flag-diff td {
    background: var(--content-bg);
}

.flag-diff tr:nth-child(even) td {
    background: #fafbfc;
}

[data-theme="dark"] .flag-diff tr:nth-child(even) td {
    background: #1c2128;
}

.flag-diff td code {
    background: var(--code-bg);
    color: var(--code-color);
    padding: 1px 5px;
    border-radius: 3px;
    font-size: 0.88em;
}

.flag-diff td em {
    color: var(--text-muted);
}

.flag-diff tr.ctl-row td {
    background: #f0f2f4;
}

[data-theme="dark"] .flag-diff tr.ctl-row td {
    background: #21262d;
}

/* Code comparison tables */
.code-comparison {
    width: 100%;
    table-layout: fixed;
    border-collapse: separate;
    border-spacing: 20px 0;
    border: none;
}

.code-comparison th {
    width: 50%;
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 12px 20px;
    font-family: 'Roboto Mono', monospace;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid #3e3e3e;
    border-radius: 6px 6px 0 0;
}

[data-theme="dark"] .code-comparison th {
    background: #21262d;
    border-color: #444c56;
}

.code-comparison td {
    padding: 0;
    background: #1e1e1e;
    border: 1px solid #3e3e3e;
    border-top: none;
    border-radius: 0 0 6px 6px;
}

[data-theme="dark"] .code-comparison td {
    background: #161b22;
    border-color: #444c56;
}

.code-comparison pre {
    margin: 0;
    border-radius: 0 0 6px 6px;
    font-size: 12px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    padding: 20px;
    background: transparent;
    color: #d4d4d4;
    border: none;
}

/* VS Code-style syntax highlighting for C code */
.code-comparison code {
    font-family: 'Roboto Mono', Consolas, 'Courier New', monospace;
    background: transparent;
    padding: 0;
}

.code-comparison .keyword { color: #c586c0; font-weight: 500; }
.code-comparison .type { color: #4ec9b0; }
.code-comparison .function { color: #dcdcaa; }
.code-comparison .string { color: #ce9178; }
.code-comparison .comment { color: #6a9955; font-style: italic; }
.code-comparison .number { color: #b5cea8; }
.code-comparison .operator { color: #d4d4d4; }
.code-comparison .preprocessor { color: #c586c0; }

/* Option lists inside comparison tables */
.code-comparison td p.option-list {
    color: #d4d4d4;
    font-size: 0.9rem;
    margin: 12px 0 4px 0;
    padding: 0 8px;
}
.code-comparison td ul.option-list {
    list-style: none;
    padding: 0 8px;
    margin: 0 0 8px 0;
    font-size: 0.85rem;
    color: #cccccc;
    line-height: 1.7;
}
.code-comparison td ul.option-list li {
    padding: 1px 0;
}
.code-comparison td ul.option-list code {
    background: #2d2d2d;
    color: #ce9178;
    padding: 1px 5px;
    border-radius: 3px;
    font-size: 0.85em;
}

[data-theme="dark"] .code-comparison td ul.option-list code {
    background: #2d333b;
}

/* Admonitions — light theme */
.admonition {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-left: 4px solid #e5e7eb;
    border-radius: 6px;
    padding: 16px 24px;
    margin: 20px 0;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    color: #374151;
}

.admonition-title {
    background: transparent;
    color: #1f2937;
    margin: -16px -24px 12px -24px;
    padding: 16px 24px 8px 24px;
    border: none;
    border-bottom: 1px solid #e5e7eb;
    font-weight: 500;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
}

.admonition-title .icon {
    margin-right: 8px;
    font-style: normal;
    opacity: 0.8;
}

.admonition p {
    color: #6b7280;
    line-height: 1.6;
    font-size: 15px;
}

/* Note / default admonition */
.admonition.note {
    border-left-color: #3b82f6;
}
.admonition.note .admonition-title {
    color: #3b82f6;
    border-bottom-color: #e5e7eb;
}

/* Warning / Caution */
.admonition.warning,
.admonition.caution,
.admonition.attention {
    border-left-color: #f59e0b;
}
.admonition.warning .admonition-title,
.admonition.caution .admonition-title,
.admonition.attention .admonition-title {
    color: #f59e0b;
    border-bottom-color: #e5e7eb;
}

/* Danger / Error */
.admonition.danger,
.admonition.error {
    border-left-color: #ef4444;
}
.admonition.danger .admonition-title,
.admonition.error .admonition-title {
    color: #ef4444;
    border-bottom-color: #e5e7eb;
}

/* Hint / Tip */
.admonition.hint,
.admonition.tip {
    border-left-color: #10b981;
}
.admonition.hint .admonition-title,
.admonition.tip .admonition-title {
    color: #10b981;
    border-bottom-color: #e5e7eb;
}

/* Important */
.admonition.important {
    border-left-color: #a855f7;
}
.admonition.important .admonition-title {
    color: #a855f7;
    border-bottom-color: #e5e7eb;
}

/* Admonitions — dark theme */
[data-theme="dark"] .admonition {
    background: #111827;
    border: 1px solid #374151;
    border-left: 4px solid #374151;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px -1px rgba(0, 0, 0, 0.3);
    color: #d1d5db;
}
[data-theme="dark"] .admonition-title {
    color: #e5e7eb;
    border-bottom-color: #4b5563;
}
[data-theme="dark"] .admonition p {
    color: #9ca3af;
}
[data-theme="dark"] .admonition.note {
    border-left-color: #60a5fa;
}
[data-theme="dark"] .admonition.note .admonition-title {
    color: #60a5fa;
    border-bottom-color: #4b5563;
}
[data-theme="dark"] .admonition.warning,
[data-theme="dark"] .admonition.caution,
[data-theme="dark"] .admonition.attention {
    border-left-color: #fbbf24;
}
[data-theme="dark"] .admonition.warning .admonition-title,
[data-theme="dark"] .admonition.caution .admonition-title,
[data-theme="dark"] .admonition.attention .admonition-title {
    color: #fbbf24;
    border-bottom-color: #4b5563;
}
[data-theme="dark"] .admonition.danger,
[data-theme="dark"] .admonition.error {
    border-left-color: #f87171;
}
[data-theme="dark"] .admonition.danger .admonition-title,
[data-theme="dark"] .admonition.error .admonition-title {
    color: #f87171;
    border-bottom-color: #4b5563;
}
[data-theme="dark"] .admonition.hint,
[data-theme="dark"] .admonition.tip {
    border-left-color: #34d399;
}
[data-theme="dark"] .admonition.hint .admonition-title,
[data-theme="dark"] .admonition.tip .admonition-title {
    color: #34d399;
    border-bottom-color: #4b5563;
}
[data-theme="dark"] .admonition.important {
    border-left-color: #c084fc;
}
[data-theme="dark"] .admonition.important .admonition-title {
    color: #c084fc;
    border-bottom-color: #4b5563;
}

hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 24px 0;
}

/* Table of Contents styling */
.table-of-contents {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--amd-red);
    border-radius: 6px;
    padding: 24px;
    margin: 20px 0;
}

[data-theme="dark"] .table-of-contents {
    background: #1c2128;
}

.table-of-contents h2 {
    margin-top: 0;
    font-size: 1.3rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.toc-list {
    list-style: none;
    margin: 16px 0 0 0;
    padding: 0;
}

.toc-list li {
    margin: 12px 0;
}

.toc-list a {
    display: inline-block;
    padding: 6px 0;
    color: var(--amd-red);
}

.toc-sublist {
    list-style: none;
    margin-left: 24px;
    margin-top: 8px;
}

/* Page navigation buttons — same as software docs */
.page-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 40px 0 20px 0;
    padding: 20px 0;
    border-top: 1px solid var(--border-color);
    gap: 20px;
}

.nav-btn {
    display: inline-flex;
    align-items: center;
    padding: 12px 20px;
    background: #f8f9fa;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: #374151 !important;
    text-decoration: none !important;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.2s ease;
    max-width: 45%;
}

.nav-btn:hover {
    background: #ffffff;
    border-color: #d1d5db;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    color: #111827 !important;
    text-decoration: none !important;
    transform: translateY(-1px);
}

.nav-btn.prev {
    text-align: left;
}

.nav-btn.next {
    text-align: right;
    margin-left: auto;
}

.nav-btn .nav-direction {
    font-size: 12px;
    opacity: 0.7;
    font-weight: 400;
    display: block;
    margin-bottom: 4px;
}

.nav-btn .nav-title {
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-btn .nav-icon {
    font-family: 'Material Symbols Outlined';
    font-weight: normal;
    font-style: normal;
    font-size: 18px;
    line-height: 1;
    letter-spacing: normal;
    text-transform: none;
    display: inline-block;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    margin: 0 16px;
}

/* Generic Material Symbols helper — use as fallback to text arrows */
.ms-icon {
    font-family: 'Material Symbols Outlined';
    font-weight: normal;
    font-style: normal;
    font-size: 1em;
    line-height: 1;
    letter-spacing: normal;
    text-transform: none;
    display: inline-block;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    vertical-align: middle;
    font-variation-settings: 'FILL' 0, 'wght' 300, 'GRAD' 0, 'opsz' 24;
}

[data-theme="dark"] .page-navigation {
    border-top-color: var(--border-color);
}

[data-theme="dark"] .nav-btn {
    background: #1f2937;
    border-color: var(--border-color);
    color: #f9fafb !important;
}

[data-theme="dark"] .nav-btn:hover {
    background: #111827;
    border-color: #4b5563;
    color: #ffffff !important;
}

@media (max-width: 768px) {
    .page-navigation {
        flex-direction: column;
        gap: 12px;
    }
    .nav-btn {
        width: 100%;
        max-width: 100%;
        justify-content: center;
    }
    .nav-btn.next { margin-left: 0; }
}

/* Footer */
footer {
    padding: 24px 60px;
    background: var(--body-bg);
    border-top: 1px solid var(--border-color);
    font-size: 13px;
    color: #666;
    margin-left: var(--sidebar-width);
    transition: background-color 0.2s, margin-left 0.3s;
}

[data-theme="dark"] footer {
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 968px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }
    
    .content, footer {
        margin-left: 0;
    }
    
    .fixed-header {
        padding: 0 20px;
    }
}

/* ===== Match software docs theme ===== */
.header-back-btn {
    margin-left: auto;
    padding: 6px 16px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none !important;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 6px;
    transition: all 0.2s;
    white-space: nowrap;
    flex-shrink: 0;
}
.header-back-btn:hover {
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.7);
    background: rgba(255, 255, 255, 0.1);
    text-decoration: none !important;
}

/* ===== Theme Toggle Button ===== */
.theme-toggle {
    position: fixed;
    top: 90px;
    right: 20px;
    z-index: 2100;
    background: #f8f8f8;
    border: 2px solid #ddd;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.theme-toggle:hover {
    background: #e8e8e8;
    border-color: #ccc;
    transform: scale(1.05);
}

.theme-toggle svg {
    transition: transform 0.3s ease;
}

.theme-toggle:focus {
    outline: 2px solid #666666;
    outline-offset: 2px;
}

[data-theme="dark"] .theme-toggle {
    background: #1a1a1a !important;
    border-color: #444444 !important;
    color: #ffffff !important;
}

[data-theme="dark"] .theme-toggle:hover {
    background: #333333 !important;
    border-color: #555555 !important;
}

/* ===== Dark Theme overrides ===== */
[data-theme="dark"] {
    color-scheme: dark;
}

[data-theme="dark"] body {
    background-color: #0d1117 !important;
    color: #c9d1d9 !important;
}

[data-theme="dark"] .content {
    background-color: #16161a !important;
    color: #c9d1d9 !important;
}

[data-theme="dark"] .content h1,
[data-theme="dark"] .content h2,
[data-theme="dark"] .content h3,
[data-theme="dark"] .content h4,
[data-theme="dark"] .content h5,
[data-theme="dark"] .content h6 {
    color: #ffffff !important;
}

/* Links */
[data-theme="dark"] .content a {
    color: #ff8080 !important;
}
[data-theme="dark"] .content a:hover {
    color: #ffaaaa !important;
}

/* Inline code */
[data-theme="dark"] code {
    background-color: #1e1e1e !important;
    color: #ff8080 !important;
    border: 1px solid #3e3e3e !important;
    border-radius: 4px !important;
}

/* Pre blocks */
[data-theme="dark"] pre {
    background-color: #1e1e1e !important;
    border: none !important;
    border-radius: 4px !important;
    color: #d4d4d4;
}

[data-theme="dark"] pre code {
    background: transparent !important;
    color: inherit !important;
    border: none !important;
    padding: 0 !important;
}

/* Tables */
[data-theme="dark"] table {
    border: 1px solid #444444 !important;
}
[data-theme="dark"] th {
    background-color: #333333 !important;
    color: #ffffff !important;
    border: 1px solid #555555 !important;
}
[data-theme="dark"] td {
    background-color: #3a3a3a !important;
    color: #ffffff !important;
    border: 1px solid #555555 !important;
}
[data-theme="dark"] tr:nth-child(even) td {
    background-color: #333333 !important;
}
/* Flag diff tables */
[data-theme="dark"] .flag-diff th {
    background-color: #333333 !important;
    color: #ffffff !important;
    border-color: #555555 !important;
}
[data-theme="dark"] .flag-diff td {
    background-color: #3a3a3a !important;
    color: #ffffff !important;
    border-color: #555555 !important;
}
[data-theme="dark"] .flag-diff tr:nth-child(even) td {
    background-color: #333333 !important;
}
[data-theme="dark"] .flag-diff tr.ctl-row td {
    background-color: #2a2a2a !important;
}

/* TOC cards */
[data-theme="dark"] .toc-card {
    background: #21262d;
    border-color: #30363d;
    color: #c9d1d9;
}
[data-theme="dark"] .toc-card h3 {
    color: #c9d1d9;
}
[data-theme="dark"] .toc-card li {
    color: #8b949e;
}
[data-theme="dark"] .toc-card:hover {
    border-color: #ed1c24;
    box-shadow: 0 8px 24px rgba(237,28,36,0.2);
}
[data-theme="dark"] .toc-card-arrow {
    color: #30363d;
}

/* TOC callout */
[data-theme="dark"] .toc-callout {
    background: rgba(237,28,36,0.08);
    color: #c9d1d9;
}

/* In-page TOC box */
[data-theme="dark"] .table-of-contents {
    background: #1c2128;
    border-color: #30363d;
    color: #c9d1d9;
}
[data-theme="dark"] .table-of-contents h2 {
    color: #c9d1d9;
}

/* HR */
[data-theme="dark"] hr {
    border-top: 2px solid #444444 !important;
}