/* GitHub UI Clone - Stylesheet */

/* 1. Root Variables (GitHub Primer 2025 Color Palette) */
:root {
    /* Canvas colors */
    --color-canvas-default: #ffffff;
    --color-canvas-subtle: #f6f8fa;
    --color-canvas-inset: #f6f8fa;
    --color-canvas-overlay: #ffffff;
    
    /* Border colors */
    --color-border-default: #d1d9e0;
    --color-border-muted: #d8dee4;
    --color-border-subtle: #eaeef2;
    
    /* Text colors */
    --color-fg-default: #1f2328;
    --color-fg-muted: #636c76;
    --color-fg-subtle: #6e7781;
    --color-fg-on-emphasis: #ffffff;
    
    /* Accent colors */
    --color-accent-fg: #0969da;
    --color-accent-emphasis: #0969da;
    --color-accent-muted: rgba(84, 174, 255, 0.4);
    --color-accent-subtle: #ddf4ff;
    
    /* Success colors */
    --color-success-fg: #1a7f37;
    --color-success-emphasis: #1f883d;
    --color-success-muted: rgba(74, 194, 107, 0.4);
    --color-success-subtle: #dafbe1;
    
    /* Danger colors */
    --color-danger-fg: #d1242f;
    --color-danger-emphasis: #da3633;
    --color-danger-muted: rgba(255, 129, 130, 0.4);
    --color-danger-subtle: #ffebe9;
    
    /* Button colors */
    --color-btn-text: #24292f;
    --color-btn-bg: #f6f8fa;
    --color-btn-border: #d1d9e0;
    --color-btn-hover-bg: #f3f4f6;
    --color-btn-hover-border: #c7d2da;
    --color-btn-active-bg: #edeff2;
    --color-btn-active-border: #c7d2da;
    
    --color-btn-primary-text: #ffffff;
    --color-btn-primary-bg: #1f883d;
    --color-btn-primary-border: rgba(31, 35, 40, 0.15);
    --color-btn-primary-hover-bg: #1a7f37;
    --color-btn-primary-hover-border: rgba(31, 35, 40, 0.15);
    --color-btn-primary-active-bg: #187733;
    
    /* Header colors */
    --color-header-bg: #24292f;
    --color-header-text: #f0f6fc;
    --color-header-logo: #f0f6fc;
    --color-header-divider: #373e47;
    
    /* Typography */
    --font-family-sans-serif: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    --font-family-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
    
    /* Layout */
    --border-radius-default: 6px;
    --border-radius-medium: 8px;
    --border-radius-large: 12px;
    
    /* Shadows */
    --shadow-small: 0 1px 0 rgba(31, 35, 40, 0.04);
    --shadow-medium: 0 3px 6px rgba(140, 149, 159, 0.15);
    --shadow-large: 0 8px 24px rgba(140, 149, 159, 0.2);
    --shadow-extra-large: 0 12px 28px rgba(140, 149, 159, 0.15);
    --shadow-inset: inset 0 1px 0 rgba(208, 215, 222, 0.2);
    
    /* Neutral colors */
    --color-neutral-muted: rgba(175, 184, 193, 0.2);
}

/* Dark theme */
[data-color-mode="dark"] {
    /* Canvas colors */
    --color-canvas-default: #0d1117;
    --color-canvas-subtle: #161b22;
    --color-canvas-inset: #010409;
    --color-canvas-overlay: #161b22;
    
    /* Border colors */
    --color-border-default: #30363d;
    --color-border-muted: #21262d;
    --color-border-subtle: #21262d;
    
    /* Text colors */
    --color-fg-default: #e6edf3;
    --color-fg-muted: #7d8590;
    --color-fg-subtle: #6e7681;
    --color-fg-on-emphasis: #ffffff;
    
    /* Accent colors */
    --color-accent-fg: #58a6ff;
    --color-accent-emphasis: #1f6feb;
    --color-accent-muted: rgba(56, 139, 253, 0.4);
    --color-accent-subtle: rgba(56, 139, 253, 0.15);
    
    /* Success colors */
    --color-success-fg: #3fb950;
    --color-success-emphasis: #238636;
    --color-success-muted: rgba(46, 160, 67, 0.4);
    --color-success-subtle: rgba(46, 160, 67, 0.15);
    
    /* Danger colors */
    --color-danger-fg: #f85149;
    --color-danger-emphasis: #da3633;
    --color-danger-muted: rgba(248, 81, 73, 0.4);
    --color-danger-subtle: rgba(248, 81, 73, 0.15);
    
    /* Button colors */
    --color-btn-text: #c9d1d9;
    --color-btn-bg: #21262d;
    --color-btn-border: rgba(240, 246, 252, 0.1);
    --color-btn-hover-bg: #30363d;
    --color-btn-hover-border: #8b949e;
    --color-btn-active-bg: hsla(212, 12%, 18%, 1);
    --color-btn-active-border: #6e7681;
    
    --color-btn-primary-text: #ffffff;
    --color-btn-primary-bg: #238636;
    --color-btn-primary-border: rgba(240, 246, 252, 0.1);
    --color-btn-primary-hover-bg: #2ea043;
    --color-btn-primary-hover-border: rgba(240, 246, 252, 0.1);
    --color-btn-primary-active-bg: #238636;
    
    /* Header colors */
    --color-header-bg: #010409;
    --color-header-text: #f0f6fc;
    --color-header-logo: #f0f6fc;
    --color-header-divider: #21262d;
    
    /* Shadows */
    --shadow-small: 0 0 transparent;
    --shadow-medium: 0 3px 6px #010409;
    --shadow-large: 0 8px 24px #010409;
    --shadow-extra-large: 0 12px 28px #010409;
    --shadow-inset: inset 0 1px 0 rgba(110, 118, 129, 0.4);
    
    /* Neutral colors */
    --color-neutral-muted: rgba(110, 118, 129, 0.4);
}

/* Auto theme detection */
@media (prefers-color-scheme: dark) {
    :root:not([data-color-mode]) {
        /* Canvas colors */
        --color-canvas-default: #0d1117;
        --color-canvas-subtle: #161b22;
        --color-canvas-inset: #010409;
        --color-canvas-overlay: #161b22;
        
        /* Border colors */
        --color-border-default: #30363d;
        --color-border-muted: #21262d;
        --color-border-subtle: #21262d;
        
        /* Text colors */
        --color-fg-default: #e6edf3;
        --color-fg-muted: #7d8590;
        --color-fg-subtle: #6e7681;
        --color-fg-on-emphasis: #ffffff;
        
        /* Accent colors */
        --color-accent-fg: #58a6ff;
        --color-accent-emphasis: #1f6feb;
        --color-accent-muted: rgba(56, 139, 253, 0.4);
        --color-accent-subtle: rgba(56, 139, 253, 0.15);
        
        /* Success colors */
        --color-success-fg: #3fb950;
        --color-success-emphasis: #238636;
        --color-success-muted: rgba(46, 160, 67, 0.4);
        --color-success-subtle: rgba(46, 160, 67, 0.15);
        
        /* Danger colors */
        --color-danger-fg: #f85149;
        --color-danger-emphasis: #da3633;
        --color-danger-muted: rgba(248, 81, 73, 0.4);
        --color-danger-subtle: rgba(248, 81, 73, 0.15);
        
        /* Button colors */
        --color-btn-text: #c9d1d9;
        --color-btn-bg: #21262d;
        --color-btn-border: rgba(240, 246, 252, 0.1);
        --color-btn-hover-bg: #30363d;
        --color-btn-hover-border: #8b949e;
        --color-btn-active-bg: hsla(212, 12%, 18%, 1);
        --color-btn-active-border: #6e7681;
        
        --color-btn-primary-text: #ffffff;
        --color-btn-primary-bg: #238636;
        --color-btn-primary-border: rgba(240, 246, 252, 0.1);
        --color-btn-primary-hover-bg: #2ea043;
        --color-btn-primary-hover-border: rgba(240, 246, 252, 0.1);
        --color-btn-primary-active-bg: #238636;
        
        /* Header colors */
        --color-header-bg: #010409;
        --color-header-text: #f0f6fc;
        --color-header-logo: #f0f6fc;
        --color-header-divider: #21262d;
        
        /* Shadows */
        --shadow-small: 0 0 transparent;
        --shadow-medium: 0 3px 6px #010409;
        --shadow-large: 0 8px 24px #010409;
        --shadow-extra-large: 0 12px 28px #010409;
        --shadow-inset: inset 0 1px 0 rgba(110, 118, 129, 0.4);
        
        /* Neutral colors */
        --color-neutral-muted: rgba(110, 118, 129, 0.4);
    }
}

/* 2. Global Styles */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font-family-sans-serif);
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-fg-default);
    background-color: var(--color-canvas-subtle);
    word-wrap: break-word;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
}

@media (max-width: 1012px) {
    .container {
        padding: 0 24px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
}

a {
    color: var(--color-accent-fg);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

a:focus {
    outline: 2px solid var(--color-accent-fg);
    outline-offset: 2px;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    margin-top: 24px;
    margin-bottom: 16px;
}

h1 { 
    font-size: 32px; 
    font-weight: 600;
    padding-bottom: 0.3em;
    border-bottom: 1px solid var(--color-border-muted);
}

h2 { 
    font-size: 24px; 
    font-weight: 600;
    padding-bottom: 0.3em;
    border-bottom: 1px solid var(--color-border-muted);
}

h3 { 
    font-size: 20px; 
    font-weight: 600;
}

h4 { 
    font-size: 16px; 
    font-weight: 600;
}

p {
    margin-top: 0;
    margin-bottom: 16px;
}

p.subtitle { 
    font-size: 20px; 
    color: var(--color-fg-muted); 
    margin-top: 0; 
    margin-bottom: 32px; 
}

ul, ol {
    padding-left: 32px;
    margin-top: 0;
    margin-bottom: 16px;
}

li {
    word-wrap: break-all;
}

li > p {
    margin-top: 16px;
}

li + li {
    margin-top: 0.25em;
}

/* 3. Header / Navbar */
.navbar {
    background-color: var(--color-header-bg);
    color: var(--color-header-text);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 32;
    border-bottom: 1px solid var(--color-header-divider);
    box-shadow: var(--shadow-small);
}

.nav-container { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
}

.nav-logo a { 
    font-size: 20px; 
    font-weight: 600; 
    color: var(--color-header-logo);
    display: flex;
    align-items: center;
}

.nav-logo a:hover { 
    text-decoration: none; 
    color: #ffffff;
}

.nav-menu { 
    display: flex; 
    list-style: none; 
    margin: 0; 
    padding: 0; 
    align-items: center;
}

.nav-item { 
    margin-left: 0; 
}

.nav-link { 
    color: var(--color-header-text); 
    font-weight: 500; 
    font-size: 14px;
    padding: 8px 16px;
    border-radius: var(--border-radius-default);
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out;
    display: block;
}

.nav-link:hover { 
    color: #ffffff; 
    text-decoration: none;
    background-color: rgba(240, 246, 252, 0.1);
}

.nav-link:focus {
    outline: 2px solid var(--color-accent-fg);
    outline-offset: 2px;
}

.nav-toggle { 
    display: none; 
    background: none; 
    border: none; 
    cursor: pointer;
    color: var(--color-header-text);
    padding: 8px;
    border-radius: var(--border-radius-default);
}

.nav-toggle:hover {
    background-color: rgba(240, 246, 252, 0.1);
}

.hamburger { 
    display: block; 
    width: 24px; 
    height: 2px; 
    background-color: var(--color-header-text); 
    position: relative;
    transition: background-color 0.3s ease;
}

.hamburger::before, .hamburger::after { 
    content: ''; 
    position: absolute; 
    width: 100%; 
    height: 2px; 
    background-color: var(--color-header-text); 
    transition: transform 0.3s ease;
}

.hamburger::before { top: -6px; }
.hamburger::after { bottom: -6px; }

/* 4. Main Content & Box Component */
main {
    padding-top: 24px;
    padding-bottom: 40px;
}

.Box {
    background-color: var(--color-canvas-default);
    border: 1px solid var(--color-border-default);
    border-radius: var(--border-radius-default);
    margin-bottom: 24px;
    overflow: hidden;
}

.Box-header {
    padding: 16px;
    border-bottom: 1px solid var(--color-border-default);
    background-color: var(--color-canvas-subtle);
    font-weight: 600;
}

.Box-header h1,
.Box-header h2, 
.Box-header h3,
.Box-header h4,
.Box-header h5,
.Box-header h6 { 
    margin: 0; 
    border-bottom: none; 
    padding: 0;
    font-size: 16px;
    font-weight: 600;
}

.Box-body { 
    padding: 16px; 
}

.Box-row { 
    padding: 16px; 
    border-bottom: 1px solid var(--color-border-muted); 
}

.Box-row:last-child { 
    border-bottom: none; 
}

.Box-row h3 {
    margin-top: 0;
    margin-bottom: 8px;
    font-size: 16px;
    font-weight: 600;
}

.text-small {
    font-size: 12px;
}

.text-gray-light {
    color: var(--color-fg-muted);
}

/* 5. Button Styles */
.btn {
    position: relative;
    display: inline-block;
    padding: 5px 16px;
    font-size: 14px;
    font-weight: 500;
    line-height: 20px;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid;
    border-radius: var(--border-radius-default);
    appearance: none;
    text-decoration: none;
    text-align: center;
    transition: 80ms cubic-bezier(0.33, 1, 0.68, 1);
    transition-property: color, background-color, box-shadow, border-color;
    
    color: var(--color-btn-text);
    background-color: var(--color-btn-bg);
    border-color: var(--color-btn-border);
    box-shadow: var(--shadow-small), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.btn:hover:not(:disabled) {
    background-color: var(--color-btn-hover-bg);
    border-color: var(--color-btn-hover-border);
    text-decoration: none;
    transition-duration: 0.1s;
}

.btn:active:not(:disabled) {
    background-color: var(--color-btn-active-bg);
    border-color: var(--color-btn-active-border);
    transition: none;
    box-shadow: inset 0 1px 0 rgba(0, 0, 0, 0.125);
}

.btn:focus:not(:disabled) {
    outline: 2px solid var(--color-accent-fg);
    outline-offset: -2px;
    box-shadow: none;
}

.btn:disabled {
    color: var(--color-fg-muted);
    background-color: var(--color-canvas-subtle);
    border-color: var(--color-border-default);
    cursor: not-allowed;
}

.btn-primary {
    color: var(--color-btn-primary-text);
    background-color: var(--color-btn-primary-bg);
    border-color: var(--color-btn-primary-border);
    box-shadow: var(--shadow-small), inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-btn-primary-hover-bg);
    border-color: var(--color-btn-primary-hover-border);
}

.btn-primary:active:not(:disabled) {
    background-color: var(--color-btn-primary-active-bg);
    box-shadow: inset 0 1px 0 rgba(0, 0, 0, 0.15);
}

.btn-primary:focus:not(:disabled) {
    box-shadow: 0 0 0 3px rgba(31, 136, 61, 0.3);
}

.btn-primary:disabled {
    color: rgba(255, 255, 255, 0.8);
    background-color: var(--color-success-muted);
    border-color: var(--color-btn-primary-border);
}

.btn-danger {
    color: var(--color-danger-fg);
    background-color: var(--color-btn-bg);
    border-color: var(--color-border-default);
}

.btn-danger:hover:not(:disabled) {
    color: var(--color-fg-on-emphasis);
    background-color: var(--color-danger-emphasis);
    border-color: var(--color-danger-emphasis);
}

.btn-danger:focus:not(:disabled) {
    box-shadow: 0 0 0 3px rgba(218, 54, 51, 0.3);
}

.btn-sm {
    padding: 3px 12px;
    font-size: 12px;
    line-height: 18px;
}

.btn-lg {
    padding: 10px 20px;
    font-size: 16px;
    line-height: 24px;
}

/* 6. Footer */
footer {
    font-size: 12px;
    color: var(--color-fg-muted);
    text-align: center;
    padding: 40px 0;
    margin-top: 40px;
    border-top: 1px solid var(--color-border-default);
    background-color: var(--color-canvas-default);
}

footer .container {
    padding-top: 0;
}

footer a {
    color: var(--color-accent-fg);
}

footer a:hover {
    text-decoration: underline;
}

/* 7. Hero Section */
.hero { 
    text-align: center; 
    padding: 80px 0; 
    background-color: var(--color-canvas-default);
    border-bottom: 1px solid var(--color-border-default);
    margin-bottom: 24px;
}

.hero-content h1 { 
    font-size: 48px; 
    font-weight: 600;
    margin-bottom: 16px;
    border-bottom: none;
    padding-bottom: 0;
}

.hero-content p { 
    font-size: 20px; 
    color: var(--color-fg-muted); 
    margin-bottom: 32px;
}

.hero-stats { 
    display: flex; 
    justify-content: center; 
    gap: 48px; 
    margin: 48px 0; 
    flex-wrap: wrap; 
}

.stat-item { 
    text-align: center; 
    min-width: 120px;
}

.stat-number { 
    font-size: 32px; 
    font-weight: 600; 
    display: block; 
    color: var(--color-fg-default);
    line-height: 1.2;
}

.stat-label { 
    font-size: 14px; 
    color: var(--color-fg-muted);
    margin-top: 4px;
    display: block;
}

.hero-cta { 
    display: flex; 
    justify-content: center; 
    gap: 16px; 
    flex-wrap: wrap;
}

/* 8. Specific Component Restyling */
.timeline { 
    border-left: 2px solid var(--color-border-default); 
    padding-left: 32px; 
    margin-left: 16px;
}

.timeline-item { 
    position: relative; 
    margin-bottom: 32px; 
}

.timeline-item::before { 
    content: ''; 
    position: absolute; 
    left: -41px; 
    top: 6px; 
    width: 12px; 
    height: 12px; 
    background-color: var(--color-canvas-default); 
    border: 2px solid var(--color-border-default);
    border-radius: 50%; 
}

.timeline-item:first-child::before {
    background-color: var(--color-success-emphasis);
    border-color: var(--color-success-emphasis);
}

.myths-facts-table { 
    border: 1px solid var(--color-border-default); 
    border-radius: var(--border-radius-default); 
    overflow: hidden; 
    margin-bottom: 24px;
}

.table-row { 
    display: flex; 
    border-bottom: 1px solid var(--color-border-default); 
}

.table-row:last-child { 
    border-bottom: none; 
}

.table-row.header { 
    background-color: var(--color-canvas-subtle); 
    font-weight: 600; 
}

.table-cell { 
    padding: 16px; 
    width: 50%; 
    font-size: 14px;
    line-height: 1.5;
}

.table-cell:first-child { 
    border-right: 1px solid var(--color-border-default); 
}

.feature-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); 
    gap: 24px; 
}

.feature-item { 
    background: var(--color-canvas-default); 
    border: 1px solid var(--color-border-default); 
    border-radius: var(--border-radius-default); 
    padding: 24px; 
    transition: border-color 0.15s ease-in-out;
}

.feature-item:hover { 
    border-color: var(--color-border-muted);
}

.feature-item h3 { 
    margin-top: 0; 
    margin-bottom: 12px;
    font-size: 16px;
    font-weight: 600;
    border-bottom: none;
    padding-bottom: 0;
}

.feature-item p {
    margin-bottom: 16px;
    color: var(--color-fg-muted);
    font-size: 14px;
}

.action-grid-full .action-item-full { 
    margin-bottom: 24px; 
    padding: 24px;
    background-color: var(--color-canvas-default);
    border: 1px solid var(--color-border-default);
    border-radius: var(--border-radius-default);
}

/* 8. Hero Section */
.hero { text-align: center; padding: 64px 0; background-color: var(--color-canvas-subtle); border-bottom: 1px solid var(--color-border-default); }
.hero-content h1 { font-size: 48px; }
.hero-content p { font-size: 20px; color: var(--color-fg-muted); }
.hero-stats { display: flex; justify-content: center; gap: 40px; margin: 40px 0; flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-number { font-size: 32px; font-weight: 600; display: block; color: var(--color-fg-default); }
.stat-label { font-size: 14px; color: var(--color-fg-muted); }
.hero-cta { display: flex; justify-content: center; gap: 16px; }

/* 9. Back to top button */
.back-to-top { 
    position: fixed; 
    bottom: 24px; 
    right: 24px; 
    background-color: var(--color-accent-fg); 
    color: var(--color-btn-primary-text); 
    border: none; 
    border-radius: var(--border-radius-default); 
    width: 48px; 
    height: 48px; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    cursor: pointer; 
    opacity: 0; 
    visibility: hidden; 
    transition: all 0.2s ease-in-out; 
    z-index: 32;
    box-shadow: var(--shadow-medium);
}

.back-to-top.visible { 
    opacity: 1; 
    visibility: visible; 
}

.back-to-top:hover {
    background-color: var(--color-accent-emphasis);
    transform: translateY(-2px);
    box-shadow: var(--shadow-large);
}

.back-to-top svg { 
    fill: var(--color-btn-primary-text); 
    width: 20px;
    height: 20px;
}

.back-to-top:focus {
    outline: 2px solid var(--color-accent-fg);
    outline-offset: 2px;
}

/* 10. Responsive Design */
@media (max-width: 1012px) {
    .hero {
        padding: 64px 0;
    }
    
    .hero-content h1 {
        font-size: 40px;
    }
    
    .hero-stats {
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .nav-toggle { 
        display: block; 
    }
    
    .nav-menu { 
        flex-direction: column; 
        background-color: var(--color-header-bg); 
        position: absolute; 
        top: 64px; 
        right: 16px; 
        width: 240px; 
        border-radius: var(--border-radius-default); 
        box-shadow: var(--shadow-large); 
        padding: 8px; 
        display: none;
        border: 1px solid var(--color-header-divider);
    }
    
    .nav-menu.active { 
        display: flex; 
    }
    
    .nav-item { 
        margin: 0; 
    }
    
    .nav-link { 
        padding: 12px 16px; 
        display: block;
        border-radius: var(--border-radius-default);
    }
    
    .hero {
        padding: 48px 0;
    }
    
    .hero-content h1 { 
        font-size: 32px; 
    }
    
    .hero-content p { 
        font-size: 18px; 
    }
    
    .hero-stats { 
        gap: 24px;
        flex-direction: column;
        align-items: center;
    }
    
    .hero-cta { 
        flex-direction: column; 
        align-items: center;
        gap: 12px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .table-row { 
        flex-direction: column; 
    }
    
    .table-cell { 
        width: auto; 
    }
    
    .table-cell:first-child { 
        border-right: none; 
        border-bottom: 1px solid var(--color-border-default); 
    }
    
    .back-to-top {
        bottom: 16px;
        right: 16px;
        width: 44px;
        height: 44px;
    }
    
    .back-to-top svg {
        width: 18px;
        height: 18px;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 28px;
    }
    
    .hero-content p {
        font-size: 16px;
    }
    
    .stat-number {
        font-size: 24px;
    }
    
    .stat-label {
        font-size: 12px;
    }
    
    .Box-body,
    .feature-item {
        padding: 16px;
    }
    
    .timeline {
        padding-left: 24px;
        margin-left: 8px;
    }
}

/* 11. JavaScript交互效果样式 */

/* 页面加载动画 */
body {
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

body.loaded {
    opacity: 1;
}

/* 元素进入动画 */
.Box, .feature-item, .timeline-item {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.Box.animate-in, .feature-item.animate-in, .timeline-item.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* 涟漪效果 */
.btn {
    position: relative;
    overflow: hidden;
}

.ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    transform: scale(0);
    animation: ripple-animation 0.6s linear;
    pointer-events: none;
}

@keyframes ripple-animation {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* 按钮按下效果 */
.btn-pressed {
    transform: scale(0.98);
    transition: transform 0.1s ease-out;
}

/* 键盘导航样式 */
body.using-keyboard *:focus {
    outline: 2px solid var(--color-accent-fg) !important;
    outline-offset: 2px !important;
}

body:not(.using-keyboard) *:focus {
    outline: none;
}

/* 阅读进度条 */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent-fg) 0%, var(--color-success-emphasis) 100%);
    z-index: 50;
    transition: width 0.1s ease-out;
}

/* 汉堡菜单动画 */
.nav-toggle.active .hamburger {
    background-color: transparent;
}

.nav-toggle.active .hamburger::before {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active .hamburger::after {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* 导航菜单动画增强 */
.nav-menu {
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease-in-out;
}

.nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.nav-menu .nav-link {
    transform: translateX(-10px);
    opacity: 0;
    transition: all 0.2s ease-in-out;
}

.nav-menu.active .nav-link {
    transform: translateX(0);
    opacity: 1;
}

.nav-menu.active .nav-link:nth-child(1) { transition-delay: 0.05s; }
.nav-menu.active .nav-link:nth-child(2) { transition-delay: 0.1s; }
.nav-menu.active .nav-link:nth-child(3) { transition-delay: 0.15s; }
.nav-menu.active .nav-link:nth-child(4) { transition-delay: 0.2s; }
.nav-menu.active .nav-link:nth-child(5) { transition-delay: 0.25s; }

/* 返回顶部按钮增强 */
.back-to-top {
    transform: translateY(100px);
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.back-to-top.visible {
    transform: translateY(0);
}

/* 悬停和焦点增强 */
.feature-item, .Box-row {
    transition: all 0.2s ease-in-out;
}

.feature-item:hover, .feature-item:focus-within {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.Box-row:hover, .Box-row:focus-within {
    background-color: var(--color-canvas-subtle);
}

/* 链接悬停效果 */
a {
    position: relative;
    transition: color 0.15s ease-in-out;
}

a:not(.btn):not(.nav-link)::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: -2px;
    left: 0;
    background-color: var(--color-accent-fg);
    transition: width 0.3s ease-in-out;
}

a:not(.btn):not(.nav-link):hover::after {
    width: 100%;
}

/* 表格行悬停效果 */
.table-row:not(.header) {
    transition: background-color 0.15s ease-in-out;
}

.table-row:not(.header):hover {
    background-color: var(--color-canvas-subtle);
}

/* 时间线项目悬停效果 */
.timeline-item {
    transition: all 0.2s ease-in-out;
    border-radius: var(--border-radius-default);
    padding: 12px;
    margin: 12px 0;
}

.timeline-item:hover {
    background-color: var(--color-canvas-subtle);
    transform: translateX(8px);
}

/* 加载状态指示器 */
.loading-indicator {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--color-border-muted);
    border-radius: 50%;
    border-top-color: var(--color-accent-fg);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* 平滑过渡 */
* {
    scroll-behavior: smooth;
}

/* 12. GitHub UI组件 */

/* 标签/徽章组件 */
.Label {
    display: inline-block;
    padding: 0 7px;
    font-size: 12px;
    font-weight: 500;
    line-height: 18px;
    white-space: nowrap;
    border: 1px solid transparent;
    border-radius: 2em;
    color: var(--color-fg-default);
    background-color: var(--color-neutral-muted);
}

.Label--primary {
    color: var(--color-btn-primary-text);
    background-color: var(--color-btn-primary-bg);
}

.Label--secondary {
    color: var(--color-fg-muted);
    background-color: var(--color-canvas-subtle);
    border-color: var(--color-border-default);
}

.Label--accent {
    color: var(--color-accent-fg);
    background-color: var(--color-accent-subtle);
}

.Label--success {
    color: var(--color-success-fg);
    background-color: var(--color-success-subtle);
}

.Label--attention {
    color: var(--color-attention-fg, #9a6700);
    background-color: var(--color-attention-subtle, #fff8c5);
}

.Label--danger {
    color: var(--color-danger-fg);
    background-color: var(--color-danger-subtle);
}

.Label--large {
    padding: 4px 12px;
    font-size: 14px;
    line-height: 22px;
}

/* 进度条组件 */
.Progress {
    display: flex;
    height: 8px;
    overflow: hidden;
    background-color: var(--color-border-muted);
    border-radius: 6px;
}

.Progress-item {
    outline: 1px solid transparent;
    background-color: var(--color-success-emphasis);
}

.Progress--large {
    height: 10px;
}

.Progress--small {
    height: 6px;
}

/* 统计卡片组件 */
.Counter {
    display: inline-block;
    min-width: 20px;
    padding: 0 6px;
    font-size: 12px;
    font-weight: 500;
    line-height: 18px;
    color: var(--color-fg-default);
    text-align: center;
    background-color: var(--color-neutral-muted);
    border: 1px solid transparent;
    border-radius: 2em;
}

.Counter--primary {
    color: var(--color-btn-primary-text);
    background-color: var(--color-btn-primary-bg);
}

/* 通知/警告框组件 */
.flash {
    padding: 16px;
    margin-bottom: 16px;
    border: 1px solid transparent;
    border-radius: var(--border-radius-default);
}

.flash-success {
    color: var(--color-success-fg);
    background-color: var(--color-success-subtle);
    border-color: var(--color-success-muted);
}

.flash-warn {
    color: var(--color-attention-fg, #9a6700);
    background-color: var(--color-attention-subtle, #fff8c5);
    border-color: var(--color-attention-muted, rgba(212, 167, 44, 0.4));
}

.flash-error {
    color: var(--color-danger-fg);
    background-color: var(--color-danger-subtle);
    border-color: var(--color-danger-muted);
}

.flash-info {
    color: var(--color-accent-fg);
    background-color: var(--color-accent-subtle);
    border-color: var(--color-accent-muted);
}

/* 输入框组件 */
.form-control {
    padding: 5px 12px;
    font-size: 14px;
    line-height: 20px;
    color: var(--color-fg-default);
    vertical-align: middle;
    background-color: var(--color-canvas-default);
    background-repeat: no-repeat;
    background-position: right 8px center;
    border: 1px solid var(--color-border-default);
    border-radius: var(--border-radius-default);
    outline: none;
    box-shadow: var(--shadow-inset);
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    border-color: var(--color-accent-fg);
    outline: none;
    box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.3);
}

.form-control::placeholder {
    color: var(--color-fg-muted);
}

/* 选择框样式 */
.form-select {
    padding-right: 24px;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23586069' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m1 6 6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 16px 12px;
    appearance: none;
}

/* 复选框和单选框 */
.form-checkbox,
.form-radio {
    padding-left: 20px;
}

.form-checkbox input[type="checkbox"],
.form-radio input[type="radio"] {
    float: left;
    margin: 2px 0 0 -20px;
    vertical-align: middle;
}

/* 状态指示器 */
.State {
    display: inline-block;
    padding: 4px 8px;
    font-size: 12px;
    font-weight: 500;
    line-height: 1;
    color: var(--color-fg-on-emphasis);
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 2em;
}

.State--open {
    color: var(--color-fg-on-emphasis);
    background-color: var(--color-success-emphasis);
}

.State--closed {
    color: var(--color-fg-on-emphasis);
    background-color: var(--color-danger-emphasis);
}

.State--merged {
    color: var(--color-fg-on-emphasis);
    background-color: var(--color-done-emphasis, #8250df);
}

/* 头像组件 */
.avatar {
    display: inline-block;
    overflow: hidden;
    line-height: 1;
    vertical-align: middle;
    border-radius: 50%;
}

.avatar-1 { width: 16px; height: 16px; }
.avatar-2 { width: 20px; height: 20px; }
.avatar-3 { width: 24px; height: 24px; }
.avatar-4 { width: 28px; height: 28px; }
.avatar-5 { width: 32px; height: 32px; }
.avatar-6 { width: 40px; height: 40px; }
.avatar-7 { width: 48px; height: 48px; }
.avatar-8 { width: 64px; height: 64px; }

/* 工具提示 */
.tooltipped {
    position: relative;
}

.tooltipped::after {
    position: absolute;
    z-index: 1000000;
    display: none;
    padding: 0.5em 0.75em;
    font: normal normal 11px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    -webkit-font-smoothing: subpixel-antialiased;
    color: var(--color-fg-on-emphasis);
    text-align: center;
    text-decoration: none;
    text-shadow: none;
    text-transform: none;
    letter-spacing: normal;
    word-wrap: break-word;
    white-space: pre;
    pointer-events: none;
    content: attr(aria-label);
    background: var(--color-neutral-emphasis-plus, #24292f);
    border-radius: 6px;
    opacity: 0;
}

.tooltipped:hover::after,
.tooltipped:active::after,
.tooltipped:focus::after {
    display: inline-block;
    text-decoration: none;
    animation-name: tooltip-appear;
    animation-duration: 0.1s;
    animation-fill-mode: forwards;
    animation-timing-function: ease-in;
    animation-delay: 0.4s;
}

@keyframes tooltip-appear {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* 分页组件 */
.pagination {
    display: flex;
    justify-content: center;
    margin: 20px 0;
}

.pagination a,
.pagination span {
    position: relative;
    display: block;
    padding: 7px 12px;
    margin-left: -1px;
    line-height: 20px;
    color: var(--color-accent-fg);
    text-decoration: none;
    background-color: var(--color-canvas-default);
    border: 1px solid var(--color-border-default);
}

.pagination a:hover {
    background-color: var(--color-canvas-subtle);
}

.pagination .current {
    color: var(--color-fg-on-emphasis);
    background-color: var(--color-accent-emphasis);
    border-color: var(--color-accent-emphasis);
}

.pagination a:first-child,
.pagination span:first-child {
    margin-left: 0;
    border-top-left-radius: var(--border-radius-default);
    border-bottom-left-radius: var(--border-radius-default);
}

.pagination a:last-child,
.pagination span:last-child {
    border-top-right-radius: var(--border-radius-default);
    border-bottom-right-radius: var(--border-radius-default);
}

/* 13. 主题切换按钮 */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    margin-left: 16px;
    padding: 0;
    color: var(--color-header-text);
    background: none;
    border: 1px solid transparent;
    border-radius: var(--border-radius-default);
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}

.theme-toggle:hover {
    background-color: rgba(240, 246, 252, 0.1);
    border-color: var(--color-header-divider);
}

.theme-toggle:focus {
    outline: 2px solid var(--color-accent-fg);
    outline-offset: 2px;
}

.theme-icon {
    transition: opacity 0.2s ease-in-out;
}

/* 亮色主题下显示月亮图标 */
[data-color-mode="light"] .theme-icon-light {
    display: none;
}

[data-color-mode="light"] .theme-icon-dark {
    display: block;
}

/* 暗色主题下显示太阳图标 */
[data-color-mode="dark"] .theme-icon-light {
    display: block;
}

[data-color-mode="dark"] .theme-icon-dark {
    display: none;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .theme-toggle {
        order: -1;
        margin-left: 0;
        margin-right: 16px;
    }
}