:root {
    /* Color Palette - Modern Dark Theme (Restored) */
    --bg-base: #0f1115;
    /* Deep dark background */
    --bg-sidebar: #161b22;
    /* Slightly lighter for sidebar */
    --bg-element: #21262d;
    /* Element background (cards, code blocks) */
    --bg-hover: #30363d;
    /* Hover state */

    --text-main: #c9d1d9;
    /* Primary text */
    --text-dim: #8b949e;
    /* Secondary text */
    --text-inverse: #f0f6fc;
    /* High contrast text */

    --accent: #58a6ff;
    /* Primary Blue */
    --accent-dim: #1f6feb;
    /* Darker Blue */
    --accent-glow: rgba(88, 166, 255, 0.15);

    --border: #30363d;
    /* Subtle borders */

    /* Syntax Highlighting Colors (Tokyo Night) */
    --code-keyword-control: #bb9af7;
    /* Purple (Control: if, return, etc) */
    --code-keyword: #f7768e;
    /* Red (Storage: fn, let, mut) - Requested */
    --code-func: #7aa2f7;
    /* Blue */
    --code-macro: #7dcfff;
    /* Cyan */
    --code-str: #9ece6a;
    /* Green */
    --code-type: #ff9e64;
    /* Orange */
    --code-num: #ff9e64;
    /* Orange (Numbers) */
    --code-oper: #89ddff;
    /* Cyan/Blue (Operators) */
    --code-comment: #565f89;
    /* Blue/Grey */
    --code-punct: #c0caf5;
    /* Foreground (default) */

    /* Typography */
    --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    --font-code: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

/* Syntax Highlighting Tokens */
.token-keyword-control {
    color: var(--code-keyword-control);
    font-weight: bold;
}

.token-keyword {
    color: var(--code-keyword);
    font-style: italic;
    /* Dracula often italics storage keywords */
}

.token-type {
    color: var(--code-type);
    font-style: italic;
}

.token-function {
    color: var(--code-func);
}

.token-macro {
    color: var(--code-macro);
}

.token-string {
    color: var(--code-str);
}

.token-number {
    color: var(--code-num);
}

.token-comment {
    color: var(--code-comment);
}

.token-operator {
    color: var(--code-oper);
}

.token-punctuation {
    color: var(--code-punct);
}

/* Library (Module) */
.token-library {
    color: #73daca;
    /* Teal */
}

/* Rainbow Brackets */
.token-punct-p1,
.token-punct-b1,
.token-punct-k1 {
    color: #bd93f9;
}

/* Violet */
.token-punct-p2,
.token-punct-b2,
.token-punct-k2 {
    color: #8be9fd;
}

/* Blue */
.token-punct-p0,
.token-punct-b0,
.token-punct-k0 {
    color: #f1fa8c;
}

/* Yellow */

.token-variable {
    color: #f8f8f2;
    /* Default foreground for variables */
}

/* Identifiers that aren't keywords/types (often variables) */
.code-link {
    color: inherit;
    text-decoration: underline;
    text-decoration-style: dotted;
    text-decoration-color: var(--border);
    transition: all 0.2s;
}

.code-link:hover {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-style: solid;
    text-decoration-color: var(--accent);
    cursor: pointer;
}

/* Ensure Linked Tokens keep their color */
a.token-keyword-control,
.token-keyword-control {
    color: var(--code-keyword-control) !important;
}

a.token-keyword,
.token-keyword {
    color: var(--code-keyword) !important;
}

a.token-type,
.token-type {
    color: var(--code-type) !important;
}

a.token-library,
.token-library {
    color: #73daca !important;
    /* Teal for Libraries */
}

a.token-function,
.token-function {
    color: var(--code-func) !important;
}

a.token-macro,
.token-macro {
    color: var(--code-macro) !important;
}

a.token-string,
.token-string {
    color: var(--code-str) !important;
}

a.token-number,
.token-number {
    color: var(--code-num) !important;
}

a.token-comment,
.token-comment {
    color: var(--code-comment) !important;
}

a.token-variable,
.token-variable {
    color: var(--text-main);
    /* Default for variables */
}

/* Reset & Base */
p {
    line-height: 1.6;
}

* {
    box-sizing: border-box;
}

body {
    background: var(--bg-base);
    color: var(--text-main);
    font-family: var(--font-ui);
    margin: 0;
    display: flex;
    height: 100vh;
    overflow: hidden;
    font-size: 15px;
    line-height: 1.5;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: #30363d;
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: #484f58;
}

/* Links */
a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--code-str);
    text-decoration: none;
}

/* Sidebar structure */
#sidebar {
    width: 320px;
    min-width: 320px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 10;
}

/* Sidebar Logo */
#logo {
    padding: 24px 20px;
    font-weight: 800;
    font-size: 20px;
    color: var(--text-inverse);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-sidebar);
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dim));
    color: white;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: bold;
    box-shadow: 0 4px 12px rgba(31, 111, 235, 0.3);
}

.version {
    font-size: 11px;
    background: var(--bg-element);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--text-dim);
    margin-left: auto;
    font-weight: normal;
    border: 1px solid var(--border);
}

/* Search Box */
#search-box {
    padding: 16px;
    border-bottom: 1px solid var(--border);
}

#search-input {
    width: 100%;
    background: var(--bg-base);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
    transition: all 0.2s;
    outline: none;
}

#search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Navigation Tree */
#nav-tree {
    flex: 1;
    overflow-y: auto;
    padding: 16px 0;
}

details>summary {
    list-style: none;
    outline: none;
}

details>summary::-webkit-details-marker {
    display: none;
}

/* Categories (Folders) */
.nav-header {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text-dim);
    padding: 8px 20px;
    margin-top: 8px;
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    letter-spacing: 0.5px;
    transition: color 0.2s;
}

.nav-header:hover {
    color: var(--text-main);
}

.nav-header:before {
    content: '›';
    display: inline-block;
    width: 16px;
    font-size: 14px;
    transition: transform 0.2s;
    margin-right: 4px;
    text-align: center;
}

details[open]>.nav-header:before {
    transform: rotate(90deg);
}

/* Pages (Files) */
.nav-page-header {
    display: flex;
    align-items: center;
    padding: 4px 20px;
    cursor: default;
}

.nav-page-link {
    color: var(--text-main);
    font-size: 14px;
    flex: 1;
    padding: 6px 12px;
    border-radius: 6px;
    display: block;
    transition: all 0.2s;
    text-decoration: none;
    opacity: 0.9;
}

.nav-page-link:hover {
    background: var(--bg-hover);
    color: white;
    text-decoration: none;
    opacity: 1;
}

/* Active State for Pages */
.nav-page-link.active {
    background: var(--accent-glow);
    color: var(--accent);
    font-weight: 600;
}

/* Sub-items Container (Methods/Properties) */
.nav-sub-items {
    padding-left: 0;
    margin: 2px 0 8px 0;
    display: flex;
    flex-direction: column;
}

/* Sub-items Links */
.nav-sub-item {
    font-size: 13px;
    color: var(--text-dim);
    padding: 4px 12px 4px 0;
    /* Padding left set dynamically in JS or override here */
    display: block;
    text-decoration: none;
    transition: color 0.2s;
    border-left: 1px solid var(--border);
    margin-left: 20px;
    /* Indent guide */
}

/* Override padding from JS inline styles if needed, but JS uses direct style. 
   Let's rely on JS indentation for hierarchy depth but style the look here. */

.nav-sub-item:hover {
    color: var(--accent);
    text-decoration: none;
    border-left-color: var(--accent);
}

.nav-sub-item.active {
    color: var(--accent);
    font-weight: 500;
    border-left-color: var(--accent);
    background: linear-gradient(90deg, var(--bg-hover) 0%, transparent 100%);
}

/* Main Content Area */
#main {
    flex: 1;
    padding: 0;
    overflow-y: auto;
    position: relative;
    background: var(--bg-base);
}

#content {
    max-width: 900px;
    margin: 0 auto;
    padding: 48px 60px;
    padding-bottom: 100px;
}

/* Headings */
h1 {
    font-size: 36px;
    font-weight: 800;
    color: var(--text-inverse);
    margin: 0 0 8px 0;
    letter-spacing: -0.5px;
    border: none;
}

.page-header {
    border-bottom: 1px solid var(--border);
    padding-bottom: 24px;
    margin-bottom: 32px;
}

.crumb {
    font-size: 13px;
    color: var(--accent);
    margin-bottom: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

h2 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-inverse);
    margin: 56px 0 24px 0;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
    position: relative;
}

h2:after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 60px;
    height: 1px;
    background: var(--accent);
}

h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-main);
    margin: 32px 0 16px 0;
}

/* Descriptions */
.description {
    font-size: 18px;
    color: var(--text-dim);
    line-height: 1.6;
    margin-bottom: 32px;
    font-weight: 300;
}

.inherits {
    margin-top: 8px;
    font-size: 13px;
    color: var(--text-dim);
}

/* Tables */
.api-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 24px 0;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    font-size: 14px;
    background: var(--bg-sidebar);
}

.api-table th {
    background: var(--bg-element);
    color: var(--text-main);
    text-align: left;
    padding: 12px 16px;
    font-weight: 600;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

.api-table td {
    border-bottom: 1px solid var(--border);
    padding: 12px 16px;
    vertical-align: top;
    color: var(--text-dim);
    transition: background 0.2s;
}

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

.api-table tr:hover td {
    background: var(--bg-hover);
    color: var(--text-main);
}

/* Type / Code Styles */
.type {
    color: var(--code-keyword);
    font-family: var(--font-code);
    font-weight: 600;
}

.method-link {
    font-family: var(--font-code);
    font-weight: 600;
    color: var(--accent) !important;
}

.version-badge {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    margin-top: 4px;
    font-family: var(--font-code);
}

.version-badge.since {
    background: rgba(80, 250, 123, 0.2);
    color: #50fa7b;
    border: 1px solid rgba(80, 250, 123, 0.4);
}

.version-badge.not-implemented {
    background: rgba(255, 184, 108, 0.2);
    color: #ffb86c;
    border: 1px solid rgba(255, 184, 108, 0.4);
}

.version-badge.deprecated {
    background: rgba(255, 85, 85, 0.2);
    color: #ff5555;
    border: 1px solid rgba(255, 85, 85, 0.4);
}

.version-info-footer {
    display: block;
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-dim);
    font-family: var(--font-code);
    text-align: right;
    /* Move to right */
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 10px 20px;
    border-top: 1px solid var(--border);
    margin-top: auto;
    /* Push to bottom if flex */
}

.sidebar-link-changelog {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text);
    text-decoration: none;
    padding: 8px 0;
    transition: color 0.2s;
}

.sidebar-link-changelog:hover {
    color: var(--accent);
}

/* Method Details Badge Positioning */
.method-signature-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    flex-wrap: nowrap;
    gap: 12px;
}

.signature-left {
    flex: 1 1 auto;
    word-break: break-word;
    overflow-wrap: anywhere;
    line-height: 1.6;
}

.signature-right {
    flex-shrink: 0;
    white-space: nowrap;
    margin-top: 2px;
}

.prop-name {
    font-family: var(--font-code);
    font-weight: 600;
    color: var(--text-inverse);
}

.code,
code {
    font-family: var(--font-code);
    background: rgba(110, 118, 129, 0.4e-1);
    /* Subtle code bg */
    background: #272c35;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--text-main);
    border: 1px solid rgba(240, 246, 252, 0.1);
}

pre {
    background: #161b22;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    border: 1px solid var(--border);
    margin: 16px 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

pre code {
    background: transparent;
    border: none;
    padding: 0;
    color: var(--text-main);
    font-size: 13px;
    line-height: 1.5;
}

/* Section Divider */
.section-divider {
    margin: 64px 0;
    border-top: 1px solid var(--border);
}

/* Method Accordion (Details/Summary) */
.expand-toggle {
    background: var(--bg-element);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    margin-bottom: 24px;
    transition: all 0.2s;
}

.expand-toggle:hover {
    background: var(--bg-hover);
    color: var(--text-inverse);
    border-color: #484f58;
}

.method-accordion {
    background: var(--bg-sidebar);
    border: 1px solid var(--border);
    margin-top: 16px;
    border-radius: 8px;
    position: relative;
    transition: all 0.3s ease;
}

.method-accordion[open] {
    border-left: 3px solid var(--accent);
    padding-bottom: 12px;
}

.method-accordion:target {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.detail-header {
    padding: 16px 20px;
    font-family: var(--font-code);
    display: flex;
    align-items: flex-start;
    gap: 12px;
    cursor: pointer;
    outline: none;
    user-select: none;
}

.method-accordion[open]>.detail-header {
    border-bottom: 1px solid var(--border);
    margin-bottom: 16px;
}

.detail-header::-webkit-details-marker {
    display: none;
}

.method-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--accent);
}

.params {
    color: var(--text-dim);
}

.detail-body {
    color: var(--text-dim);
    line-height: 1.6;
}

.group-description {
    margin-top: -10px;
    font-style: italic;
    color: #8b949e;
    margin-bottom: 40px;
}

/* ===== Callout Boxes (Rust Book Style) ===== */
.note-box,
.warning-box,
.tip-box,
.important-box {
    border-radius: 8px;
    padding: 16px 20px;
    margin: 20px 0;
    font-size: 14px;
    line-height: 1.7;
    position: relative;
    padding-left: 48px;
}

.note-box::before,
.warning-box::before,
.tip-box::before,
.important-box::before {
    position: absolute;
    left: 16px;
    top: 16px;
    font-size: 18px;
}

.note-box {
    background: rgba(88, 166, 255, 0.08);
    border: 1px solid rgba(88, 166, 255, 0.25);
    border-left: 3px solid #58a6ff;
    color: #c9d1d9;
}

.note-box::before {
    content: 'ℹ️';
}

.warning-box {
    background: rgba(255, 184, 108, 0.08);
    border: 1px solid rgba(255, 184, 108, 0.25);
    border-left: 3px solid #ffb86c;
    color: #c9d1d9;
}

.warning-box::before {
    content: '⚠️';
}

.tip-box {
    background: rgba(80, 250, 123, 0.08);
    border: 1px solid rgba(80, 250, 123, 0.25);
    border-left: 3px solid #50fa7b;
    color: #c9d1d9;
}

.tip-box::before {
    content: '💡';
}

.important-box {
    background: rgba(247, 118, 142, 0.08);
    border: 1px solid rgba(247, 118, 142, 0.25);
    border-left: 3px solid #f7768e;
    color: #c9d1d9;
}

.important-box::before {
    content: '🔴';
}

.callout-title {
    font-weight: 700;
    margin-bottom: 4px;
    display: block;
    color: var(--text-inverse);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Diagram Box (ASCII architecture) */
.diagram-box {
    background: var(--bg-element);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px 24px;
    margin: 20px 0;
    font-family: var(--font-code);
    font-size: 13px;
    line-height: 1.6;
    white-space: pre;
    overflow-x: auto;
    color: var(--text-dim);
}

/* Prose content improvements */
.description p {
    margin-bottom: 16px;
    font-size: 15px;
    color: var(--text-main);
    font-weight: 400;
}

.description h2 {
    font-size: 22px;
    margin-top: 40px;
}

.description h3 {
    font-size: 17px;
    margin-top: 28px;
    color: var(--text-inverse);
}

.description h4 {
    font-size: 15px;
    margin-top: 20px;
    color: var(--text-main);
    font-weight: 600;
}

.description ul,
.description ol {
    padding-left: 24px;
    margin: 12px 0;
}

.description li {
    margin-bottom: 8px;
    line-height: 1.7;
    color: var(--text-main);
    font-size: 15px;
}

.description strong {
    color: var(--text-inverse);
}

/* ===== Mobile Hamburger Button ===== */
#mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 100;
    width: 44px;
    height: 44px;
    background: var(--bg-sidebar);
    border: 1px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: 10px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
    transition: background 0.2s;
}

#mobile-menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-main);
    border-radius: 2px;
    transition: all 0.3s ease;
}

#mobile-menu-toggle:hover {
    background: var(--bg-hover);
}

/* Hamburger → X animation */
#mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

#mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

#mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Sidebar Overlay (dim background) */
#sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 14;
    opacity: 0;
    transition: opacity 0.3s ease;
}

#sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* ===== Responsive: Tablet (≤ 900px) ===== */
@media (max-width: 900px) {
    #sidebar {
        width: 280px;
        min-width: 280px;
    }

    #content {
        padding: 40px 32px;
        padding-bottom: 80px;
    }

    h1 {
        font-size: 28px;
    }

    h2 {
        font-size: 20px;
    }
}

/* ===== Responsive: Phone (≤ 768px) ===== */
@media (max-width: 768px) {
    #mobile-menu-toggle {
        display: flex;
    }

    #sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100dvh;
        /* dynamic viewport height to prevent UI bar cropping */
        width: 300px;
        min-width: 300px;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 15;
        box-shadow: none;
        padding-bottom: env(safe-area-inset-bottom, 24px);
    }

    #sidebar.open {
        transform: translateX(0);
        box-shadow: 8px 0 32px rgba(0, 0, 0, 0.5);
    }

    #main {
        width: 100%;
    }

    #content {
        padding: 72px 20px 80px 20px;
        max-width: 100%;
    }

    body {
        flex-direction: column;
    }

    h1 {
        font-size: 24px;
    }

    h2 {
        font-size: 18px;
        margin: 32px 0 16px 0;
    }

    h3 {
        font-size: 16px;
    }

    .description {
        font-size: 15px;
    }

    .api-table {
        font-size: 13px;
    }

    .api-table th,
    .api-table td {
        padding: 8px 10px;
    }

    pre {
        padding: 14px;
        font-size: 12px;
    }

    .detail-box {
        padding: 16px;
    }
}

/* Changelog Styles (Globalized) */
.changelog-entry {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 30px;
}

.changelog-entry h2 {
    margin-top: 0;
    color: var(--accent);
    font-size: 1.5em;
    border-bottom: 1px solid var(--border);
    padding-bottom: 10px;
    margin-bottom: 15px;
}

.changelog-entry ul {
    list-style-type: none;
    padding-left: 0;
}

.changelog-entry li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
    line-height: 1.6;
}

.changelog-entry li::before {
    content: "•";
    color: var(--accent);
    font-weight: bold;
    position: absolute;
    left: 0;
}

.method-name {
    font-size: 15px;
}

/* ===== Responsive: Small Phone (≤ 480px) ===== */
@media (max-width: 480px) {
    #content {
        padding: 68px 14px 60px 14px;
    }

    .api-table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .detail-header {
        gap: 8px;
    }
}