:root {
    --bg-color-white: #ffffff;
    --bg-color-grey: #f5f5f7;
    --text-primary: #333333;
    --text-secondary: #888888;
    --apple-blue: #007aff;
    --nav-bg: rgba(250, 250, 250, 0.85);
    --nav-border: #e3e3e3;
    --nav-height: 44px;
}

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

body {
    font-family: "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    font-weight: 300;
    color: var(--text-primary);
    background-color: var(--bg-color-white);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    font-weight: 300;
    letter-spacing: 0.01em;
}

strong {
    font-weight: 500;
}

.global-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--nav-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 9999;
    display: flex;
    justify-content: center;
}

.nav-content {
    width: 100%;
    max-width: 980px;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.nav-logo img {
    display: block;
    opacity: 0.8;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 30px;
}

.nav-links a {
    color: #666;
    text-decoration: none;
    font-size: 13px;
    font-weight: 400;
    transition: color 0.2s ease;
}

.nav-links a:hover {
    color: #000;
}

.section {
    padding: 80px 20px;
    display: flex;
    justify-content: center;
}

.section-content {
    width: 100%;
    max-width: 980px;
    text-align: center;
}

.grey-section {
    background-color: var(--bg-color-grey);
}

.white-section {
    background-color: var(--bg-color-white);
}

.section-title {
    font-size: 42px;
    margin-bottom: 10px;
    color: #111;
}

.section-subtitle {
    font-size: 24px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.section-description {
    font-size: 18px;
    max-width: 700px;
    margin: 0 auto 50px;
    color: #555;
    line-height: 1.6;
}

.hero {
    padding-top: calc(var(--nav-height) + 60px);
    padding-bottom: 60px;
    text-align: center;
    background: linear-gradient(to bottom, #ffffff, #f0f0f5);
}

.hero-title {
    font-size: 64px;
    font-weight: 300;
    margin-bottom: 10px;
    letter-spacing: -0.02em;
}

.hero-tagline {
    font-size: 24px;
    font-weight: 300;
    color: #444;
    max-width: 800px;
    margin: 0 auto 30px;
    line-height: 1.4;
}

.hero-bubble {
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 20px;
    max-width: 700px;
    margin: 0 auto 30px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.hero-bubble p {
    font-size: 16px;
    color: #555;
}

.hero-banner {
    background-color: #fff3cd;
    color: #856404;
    padding: 15px;
    border-radius: 4px;
    max-width: 700px;
    margin: 0 auto 50px;
    font-size: 14px;
    border: 1px solid #ffeeba;
}

.hero-image-container {
    max-width: 800px;
    margin: 0 auto;
}

.mac-mockup {
    width: 100%;
    height: 400px;
    background: linear-gradient(to bottom, #e2e2e2, #c8c8c8);
    border-radius: 16px 16px 0 0;
    padding: 20px 20px 0 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    position: relative;
}

.mac-mockup::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: -5%;
    width: 110%;
    height: 15px;
    background: linear-gradient(to bottom, #d4d4d4, #b0b0b0);
    border-radius: 0 0 8px 8px;
}

.mac-screen {
    width: 100%;
    height: 100%;
    background-color: #1a1a1a;
    border-radius: 4px 4px 0 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #fff;
    border: 4px solid #000;
    border-bottom: none;
}

.mac-logo {
    width: 60px;
    height: 60px;
    filter: invert(1);
    opacity: 0.9;
}

.feature-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    margin-top: 40px;
}

.feature-card {
    background: #fff;
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 30px;
    width: calc(33.333% - 20px);
    min-width: 280px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.02);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.feature-icon {
    font-size: 32px;
    color: var(--apple-blue);
    margin-bottom: 15px;
    display: inline-block;
}

.feature-card h4 {
    font-size: 20px;
    margin-bottom: 12px;
    color: #333;
    font-weight: 400;
}

.feature-card p {
    font-size: 15px;
    color: #777;
}

.contribute-grid {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.contribute-card {
    padding: 30px;
    text-align: center;
    width: calc(33.333% - 20px);
    min-width: 250px;
}

.contribute-card .emoji {
    font-size: 40px;
    display: block;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.contribute-card h4 {
    font-size: 22px;
    margin-bottom: 10px;
    font-weight: 400;
}

.contribute-card p {
    font-size: 15px;
    color: #666;
    margin-bottom: 20px;
}

.contribute-card a, .chat-links a {
    display: inline-block;
    color: var(--apple-blue);
    text-decoration: none;
    font-size: 15px;
    font-weight: 400;
    margin: 0 5px;
}

.contribute-card a:hover {
    text-decoration: underline;
}

.global-footer {
    background-color: #f0f0f0;
    border-top: 1px solid #e0e0e0;
    padding: 40px 20px;
    font-size: 12px;
    color: #888;
    text-align: center;
}

.footer-content {
    max-width: 980px;
    margin: 0 auto;
}

.footer-copy strong {
    color: #555;
    font-weight: 400;
}

.footer-copy small {
    display: block;
    margin-top: 10px;
    color: #999;
}

.fade-in-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.3s; }

@media (max-width: 768px) {
    .hero-title { font-size: 48px; }
    .hero-tagline { font-size: 20px; }
    .nav-links { display: none; }
    .feature-card, .contribute-card { width: 100%; }
    .wiki-container { flex-direction: column; }
    .wiki-sidebar { width: 100%; height: auto; position: static; border-right: none; border-bottom: 1px solid #eee; }
    .wiki-content { margin-left: 0; padding: 20px; }
}

.wiki-container {
    display: flex;
    max-width: 1200px;
    margin: var(--nav-height) auto 0;
    min-height: calc(100vh - var(--nav-height));
}

.wiki-sidebar {
    width: 250px;
    background-color: #fbfbfd;
    padding: 30px 20px;
    border-right: 1px solid #e3e3e3;
    position: fixed;
    top: var(--nav-height);
    bottom: 0;
    overflow-y: auto;
}

.wiki-sidebar h3 {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #888;
    margin-bottom: 10px;
    font-weight: 500;
}

.wiki-sidebar ul {
    list-style: none;
    margin-bottom: 30px;
}

.wiki-sidebar .nav-tree > li {
    margin-bottom: 12px;
}

.wiki-sidebar .sub-nav {
    margin-top: 5px;
    margin-left: 15px;
    margin-bottom: 0;
}

.wiki-sidebar .sub-nav li {
    margin-bottom: 4px;
}

.wiki-sidebar a {
    color: #444;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s, background-color 0.2s;
    display: block;
    padding: 6px 10px;
    border-radius: 6px;
}

.wiki-sidebar .sub-nav a {
    font-weight: 400;
}

.wiki-sidebar .parent-item {
    position: relative;
}

.wiki-sidebar .parent-label { 
    color: #222;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 10px;
    cursor: pointer;
    border-radius: 6px;
    transition: background-color 0.2s;
}
.wiki-sidebar .parent-label:hover, .wiki-sidebar .parent-label.active { background-color: #e5e5ea; }

.wiki-sidebar .sub-nav {
    margin-top: 5px;
    margin-left: 15px;
    margin-bottom: 0;
    display: none;
}

.wiki-sidebar .parent-item.expanded .sub-nav {
    display: block;
}

.wiki-sidebar .toggle-icon {
    font-size: 18px;
    transition: transform 0.2s;
}

.wiki-sidebar .parent-item.expanded .toggle-icon {
    transform: rotate(90deg);
}

.wiki-sidebar a:hover, .wiki-sidebar a.active {
    background-color: #e5e5ea;
    color: #000;
}

.wiki-content {
    flex: 1;
    margin-left: 250px;
    padding: 50px 60px;
    background-color: #ffffff;
}

.wiki-section {
    display: none;
}

.wiki-section.active {
    display: block;
}

.wiki-section h1.wiki-title { font-size: 40px; margin-bottom: 20px; font-weight: 300; }
.wiki-section h2 { font-size: 28px; margin-top: 40px; margin-bottom: 15px; border-bottom: 1px solid #eee; padding-bottom: 10px; }
.wiki-section h3 { font-size: 20px; margin-top: 25px; margin-bottom: 10px; }
.wiki-section p { margin-bottom: 15px; line-height: 1.6; color: #444; }
.wiki-section ul, .wiki-section ol { margin-left: 20px; margin-bottom: 15px; color: #444; }
.wiki-section li { margin-bottom: 5px; }
.wiki-section code { background: #f5f5f7; padding: 2px 6px; border-radius: 4px; font-family: monospace; font-size: 14px; color: #d63384; }
.wiki-section pre { background: #1a1a1a; color: #f8f8f2; padding: 15px; border-radius: 8px; overflow-x: auto; margin-bottom: 20px; position: relative; }
.wiki-section pre code { background: transparent; color: inherit; padding: 0; }
.wiki-section a { color: var(--apple-blue); text-decoration: none; }
.wiki-section a:hover { text-decoration: underline; }
.wiki-section svg { max-width: 24px; max-height: 24px; display: inline-block; vertical-align: middle; margin-right: 8px; }
.wiki-section img { max-width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.1); margin: 20px 0; border: 1px solid #eee; }

.wiki-section .copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    border-radius: 4px;
    padding: 4px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s, background 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}
.wiki-section pre:hover .copy-btn {
    opacity: 1;
}
.wiki-section .copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}
.wiki-section .copy-btn .material-symbols-outlined {
    font-size: 18px;
}

.wiki-cards {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 30px;
}

.wiki-card {
    background: #fff;
    border: 1px solid #eee;
    border-radius: 12px;
    padding: 25px;
    flex: 1 1 calc(33.333% - 20px);
    min-width: 220px;
    text-align: center;
    text-decoration: none !important;
    color: #333 !important;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 2px 8px rgba(0,0,0,0.02);
}

.wiki-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.wiki-card .material-symbols-outlined {
    font-size: 32px;
    color: var(--apple-blue);
    margin-bottom: 15px;
    display: block;
}

.wiki-card h4 {
    font-size: 18px;
    margin-bottom: 10px;
    font-weight: 500;
}

.wiki-card p {
    font-size: 14px;
    color: #666;
    margin-bottom: 0;
}
.wiki-section blockquote { 
    margin: 20px 0; 
    padding: 10px 20px; 
    background-color: #f5f5f7; 
    border-left: 4px solid var(--apple-blue); 
    color: #555; 
    font-style: italic; 
}
.wiki-section blockquote p { margin-bottom: 0; }
.wiki-section blockquote::before { content: none; }