/* ============================================
   Claude Agent SDK for Go - GitHub Pages
   Dark theme with Solarized accents
   ============================================ */

:root {
    --white: #0d1117;
    --gray-50: #0d1117;
    --gray-100: #161b22;
    --gray-200: #21262d;
    --gray-300: #30363d;
    --gray-400: #6e7681;
    --gray-500: #8b949e;
    --gray-600: #b1bac4;
    --gray-700: #c9d1d9;
    --gray-800: #e6edf3;
    --gray-900: #f0f6fc;
    --accent: #e3b341;
    --accent-light: #1c1500;
    --accent-dark: #f0c44a;
    --blue: #58a6ff;
    --blue-light: #0d1f3c;
    --go-blue: #00ADD8;
    --go-blue-dark: #33c4e8;
    --code-bg: #002b36;
    --code-text: #839496;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --max-width: 1200px;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -2px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 25px -3px rgba(0,0,0,0.5), 0 4px 6px -4px rgba(0,0,0,0.3);
    --shadow-xl: 0 20px 50px -12px rgba(0,0,0,0.6);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-sans);
    color: #ffffff;
    background: #0d1117;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Three.js Canvas */
#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 16px 0;
    transition: all 0.3s ease;
    background: rgba(13,17,23,0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.navbar.scrolled {
    padding: 10px 0;
    background: rgba(13,17,23,0.95);
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--gray-900);
    font-weight: 600;
    font-size: 15px;
    letter-spacing: -0.01em;
}

.logo-icon {
    font-size: 18px;
    color: var(--accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    text-decoration: none;
    color: var(--gray-600);
    font-size: 14px;
    font-weight: 450;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--gray-900);
}

.nav-version {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 12px;
    border-radius: 100px;
    background: rgba(46,160,67,0.15);
    color: #3fb950;
    font-size: 12px;
    font-weight: 600;
    font-family: var(--font-mono);
    border: 1px solid rgba(46,160,67,0.3);
    text-decoration: none;
    transition: all 0.2s;
}

.nav-version:hover {
    background: rgba(46,160,67,0.25);
}

.nav-version-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #3fb950;
    display: inline-block;
}

.nav-github {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 6px;
    border: 1px solid var(--gray-300);
    background: var(--gray-100);
    transition: all 0.2s;
}

.nav-github:hover {
    border-color: var(--gray-400);
    background: var(--gray-200);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: all 0.3s;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
}

.hero-content {
    max-width: 720px;
    text-align: center;
}

.hero-badges {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 100px;
    background: var(--gray-100);
    color: var(--gray-600);
    font-size: 13px;
    font-weight: 500;
    border: 1px solid var(--gray-200);
}

.version-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 100px;
    background: #ecfdf5;
    color: #065f46;
    font-size: 13px;
    font-weight: 600;
    border: 1px solid #a7f3d0;
    text-decoration: none;
    transition: all 0.2s;
    font-family: var(--font-mono);
}

.version-badge:hover {
    background: #d1fae5;
    border-color: #6ee7b7;
}

.version-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #10b981;
    display: inline-block;
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.go-badge {
    background: #eff6ff;
    color: #1e40af;
    border-color: #bfdbfe;
    font-family: var(--font-sans);
}

.go-badge:hover {
    background: #dbeafe;
    border-color: #93c5fd;
}

.hero h1 {
    font-size: clamp(48px, 8vw, 80px);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.04em;
    color: #ffffff;
    margin-bottom: 24px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--go-blue) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: #c9d1d9;
    line-height: 1.7;
    max-width: 520px;
    margin: 0 auto 40px;
    font-weight: 400;
}

.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: #ffffff;
    color: #0d1117;
}

.btn-primary:hover {
    background: #e6edf3;
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: #c9d1d9;
    border: 1px solid #30363d;
}

.btn-secondary:hover {
    border-color: var(--gray-300);
    box-shadow: var(--shadow);
    transform: translateY(-1px);
}

.hero-install {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    background: var(--code-bg);
    border-radius: 8px;
    font-family: var(--font-mono);
    font-size: 14px;
    color: #93a1a1;
    border: 1px solid #073642;
    box-shadow: var(--shadow-lg);
}

.hero-install code {
    user-select: all;
}

.copy-btn {
    background: none;
    border: none;
    color: #586e75;
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    transition: color 0.2s;
    flex-shrink: 0;
}

.copy-btn:hover {
    color: #93a1a1;
}

/* ============================================
   Sections
   ============================================ */
.section {
    position: relative;
    z-index: 1;
    padding: 100px 0;
}

.section-alt {
    background: var(--gray-50);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header h2 {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.section-header p {
    font-size: 17px;
    color: var(--gray-500);
    max-width: 480px;
    margin: 0 auto;
}

/* ============================================
   Features Grid
   ============================================ */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.feature-card {
    padding: 28px;
    border-radius: var(--radius);
    background: var(--white);
    border: 1px solid var(--gray-200);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
}

.feature-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.feature-card:hover {
    border-color: var(--gray-300);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.feature-icon {
    font-size: 28px;
    margin-bottom: 16px;
    display: inline-block;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.6;
}

.feature-card code {
    background: rgba(110,118,129,0.2);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--go-blue);
}

/* ============================================
   Steps / Quick Start
   ============================================ */
.steps {
    max-width: 720px;
    margin: 0 auto;
}

.step {
    display: flex;
    gap: 24px;
    margin-bottom: 40px;
    opacity: 0;
    transform: translateY(20px);
}

.step.visible {
    opacity: 1;
    transform: translateY(0);
}

.step-number {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--gray-900);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    margin-top: 2px;
}

.step-content {
    flex: 1;
    min-width: 0;
}

.step-content h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--gray-900);
}

.step-content > p {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 16px;
}

/* ============================================
   Code Blocks
   ============================================ */
.code-block {
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--code-bg);
    box-shadow: var(--shadow-lg);
    border: 1px solid #073642;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: #073642;
    border-bottom: 1px solid #094552;
}

.code-lang {
    font-size: 11px;
    color: #657b83;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 500;
}

.code-block pre {
    padding: 20px 24px;
    overflow-x: auto;
    margin: 0;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 13.5px;
    line-height: 1.75;
    color: #93a1a1;
    text-shadow: none;
    background: none !important;
    padding: 0;
    border-radius: 0;
}

.code-block code * {
    background: none !important;
    box-shadow: none !important;
}

/* Syntax highlighting - Solarized Dark */
.code-block span { background: none !important; }
.code-block .kw { color: #b58900; }
.code-block .str { color: #2aa198; }
.code-block .fn { color: #268bd2; }
.code-block .cmt { color: #586e75; font-style: italic; }
.code-block .num { color: #d33682; }
.code-block .type { color: #cb4b16; }

/* ============================================
   Example Tabs
   ============================================ */
.example-tabs {
    display: flex;
    gap: 4px;
    justify-content: center;
    margin-bottom: 32px;
    background: var(--gray-100);
    border-radius: 8px;
    padding: 4px;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.tab-btn {
    padding: 8px 20px;
    border: none;
    background: none;
    cursor: pointer;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-500);
    font-family: var(--font-sans);
    transition: all 0.2s;
}

.tab-btn.active {
    background: var(--white);
    color: var(--gray-900);
    box-shadow: var(--shadow-sm);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.example-split {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 32px;
    align-items: start;
    max-width: 900px;
    margin: 0 auto;
}

.example-desc h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--gray-900);
}

.example-desc p {
    font-size: 15px;
    color: var(--gray-500);
    margin-bottom: 16px;
    line-height: 1.6;
}

.example-desc code {
    background: var(--gray-100);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 13px;
}

.example-desc ul {
    list-style: none;
    padding: 0;
}

.example-desc li {
    font-size: 14px;
    color: var(--gray-600);
    padding: 4px 0;
    padding-left: 20px;
    position: relative;
}

.example-desc li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 11px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
}

/* ============================================
   Comparison Bars
   ============================================ */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.comparison-card {
    padding: 24px;
    background: var(--white);
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
    opacity: 0;
    transform: translateY(20px);
}

.comparison-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.comparison-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 16px;
}

.comparison-bars {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.bar-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.bar-label {
    font-size: 12px;
    font-weight: 500;
    color: var(--gray-500);
    width: 50px;
    flex-shrink: 0;
}

.bar-track {
    flex: 1;
    height: 8px;
    background: var(--gray-100);
    border-radius: 4px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 1s ease;
}

.bar-go {
    background: linear-gradient(90deg, var(--go-blue), var(--go-blue-dark));
}

.bar-python {
    background: var(--gray-300);
}

.bar-value {
    font-size: 12px;
    font-weight: 600;
    color: var(--gray-700);
    width: 55px;
    text-align: right;
    font-family: var(--font-mono);
    flex-shrink: 0;
}

/* ============================================
   Documentation Grid
   ============================================ */
.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.doc-card {
    padding: 28px;
    border-radius: var(--radius);
    background: var(--white);
    border: 1px solid var(--gray-200);
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
}

.doc-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.doc-card:hover {
    border-color: var(--gray-300);
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.doc-icon {
    color: var(--gray-400);
    margin-bottom: 16px;
}

.doc-card:hover .doc-icon {
    color: var(--accent);
}

.doc-card h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.doc-card p {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.6;
    margin-bottom: 16px;
}

.doc-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--accent);
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    background: var(--gray-50);
    border-top: 1px solid var(--gray-200);
}

.cta-content {
    text-align: center;
}

.cta-content h2 {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

.cta-content p {
    color: var(--gray-500);
    font-size: 17px;
    margin-bottom: 32px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    position: relative;
    z-index: 1;
    padding: 24px 0;
    border-top: 1px solid var(--gray-200);
    background: var(--white);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 14px;
    color: var(--gray-700);
}

.footer-right p {
    font-size: 13px;
    color: var(--gray-400);
}

/* ============================================
   Doc Page Layout (for sub-pages)
   ============================================ */
.doc-page {
    position: relative;
    z-index: 1;
    padding: 100px 24px 60px;
    min-height: 100vh;
}

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

.doc-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 32px;
    font-size: 14px;
}

.doc-breadcrumb a {
    color: var(--gray-400);
    text-decoration: none;
}

.doc-breadcrumb a:hover {
    color: var(--gray-600);
}

.doc-breadcrumb span {
    color: var(--gray-300);
}

.doc-body h1 {
    font-size: 36px;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
    color: #ffffff;
}

.doc-body h2 {
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-top: 48px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--gray-200);
    color: #ffffff;
}

.doc-body h3 {
    font-size: 18px;
    font-weight: 600;
    margin-top: 32px;
    margin-bottom: 12px;
    color: #ffffff;
}

.doc-body p {
    font-size: 15px;
    color: #e6edf3;
    line-height: 1.8;
    margin-bottom: 16px;
}

.doc-body code {
    background: rgba(110,118,129,0.25);
    padding: 3px 7px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 13px;
    color: #79c0ff;
    border: 1px solid rgba(110,118,129,0.2);
}

.doc-body pre {
    margin: 16px 0 24px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
}

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

.doc-body li {
    font-size: 15px;
    color: #e6edf3;
    line-height: 1.8;
    margin-bottom: 4px;
}

.doc-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0 24px;
    font-size: 14px;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.doc-body th {
    text-align: left;
    padding: 10px 16px;
    background: #161b22;
    border: 1px solid #21262d;
    font-weight: 600;
    color: #e6edf3;
}

.doc-body td {
    padding: 10px 16px;
    border: 1px solid #21262d;
    color: #e6edf3;
    background: #0d1117;
}

.doc-body strong {
    color: #e6edf3;
    font-weight: 600;
}

.doc-body hr {
    border: none;
    border-top: 1px solid var(--gray-200);
    margin: 48px 0;
}

.doc-body blockquote {
    border-left: 3px solid var(--accent);
    padding: 12px 20px;
    margin: 16px 0;
    background: var(--accent-light);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.doc-body blockquote p {
    color: var(--gray-700);
    margin: 0;
}

/* Table of contents */
.doc-toc {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 40px;
}

.doc-toc h4 {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-400);
    margin-bottom: 12px;
}

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

.doc-toc li {
    margin-bottom: 4px;
}

.doc-toc a {
    font-size: 14px;
    color: var(--gray-600);
    text-decoration: none;
    transition: color 0.2s;
}

.doc-toc a:hover {
    color: var(--accent);
}

/* ============================================
   Animations
   ============================================ */
.feature-card,
.step,
.doc-card,
.comparison-card {
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.feature-card:nth-child(2), .doc-card:nth-child(2) { transition-delay: 0.05s; }
.feature-card:nth-child(3), .doc-card:nth-child(3) { transition-delay: 0.1s; }
.feature-card:nth-child(4), .doc-card:nth-child(4) { transition-delay: 0.15s; }
.feature-card:nth-child(5) { transition-delay: 0.2s; }
.feature-card:nth-child(6) { transition-delay: 0.25s; }
.feature-card:nth-child(7) { transition-delay: 0.3s; }
.feature-card:nth-child(8) { transition-delay: 0.35s; }

.step:nth-child(2) { transition-delay: 0.1s; }
.step:nth-child(3) { transition-delay: 0.2s; }
.step:nth-child(4) { transition-delay: 0.3s; }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 16px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--gray-200);
        box-shadow: var(--shadow);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        min-height: auto;
        padding: 140px 24px 80px;
    }

    .hero h1 {
        font-size: 42px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .section {
        padding: 64px 0;
    }

    .example-split {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .comparison-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .step {
        gap: 16px;
    }

    .hero-install {
        font-size: 12px;
        padding: 10px 14px;
    }

    .nav-version {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 34px;
    }

    .example-tabs {
        flex-wrap: wrap;
    }

    .tab-btn {
        font-size: 13px;
        padding: 6px 14px;
    }
}