/* ============================================================
   GateHub - GitHub-Inspired Dark Design System
   ============================================================ */

:root {
    --gh-canvas-default: #0d1117;
    --gh-canvas-subtle: #161b22;
    --gh-canvas-overlay: #21262d;
    --gh-border-default: #30363d;
    --gh-border-muted: #21262d;
    --gh-border-subtle: rgba(240, 246, 252, 0.1);
    
    --gh-fg-default: #f0f6fc;
    --gh-fg-muted: #8b949e;
    --gh-fg-subtle: #6e7681;
    
    --gh-btn-primary-bg: #238636;
    --gh-btn-primary-hover: #2ea043;
    --gh-btn-primary-border: rgba(240, 246, 252, 0.1);
    
    --gh-accent-blue: #58a6ff;
    --gh-accent-purple: #bc8cff;
    --gh-accent-green: #3fb950;
    --gh-accent-orange: #d29922;
    --gh-accent-red: #f85149;
    
    --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
    
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    --transition: all 0.15s cubic-bezier(0.3, 0, 0.5, 1);
}

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

html {
    scroll-behavior: smooth;
    color-scheme: dark;
}

body {
    background-color: var(--gh-canvas-default);
    color: var(--gh-fg-default);
    font-family: var(--font-system);
    font-size: 14px;
    line-height: 1.5;
    overflow-x: hidden;
    position: relative;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--gh-accent-blue);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    text-decoration: underline;
}

/* Background Atmosphere Glows */
.gh-glow-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 750px;
    background: radial-gradient(circle at 50% -100px, rgba(88, 166, 255, 0.12) 0%, rgba(188, 140, 255, 0.08) 35%, rgba(13, 17, 23, 0) 70%);
    pointer-events: none;
    z-index: 0;
}

.gh-grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 600px;
    background-image: linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: linear-gradient(to bottom, black 30%, transparent 95%);
    -webkit-mask-image: linear-gradient(to bottom, black 30%, transparent 95%);
    pointer-events: none;
    z-index: 0;
}

/* ============================================================
   Header & Navigation
   ============================================================ */

.gh-header {
    background-color: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gh-border-default);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.gh-header-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.gh-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 600;
    color: var(--gh-fg-default);
    text-decoration: none;
    letter-spacing: -0.3px;
}

.gh-brand i {
    font-size: 24px;
    color: var(--gh-fg-default);
}

.gh-brand .logo-tag {
    color: var(--gh-accent-green);
    font-weight: 700;
}

.gh-nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

.gh-nav a {
    color: var(--gh-fg-default);
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    padding: 6px 8px;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.gh-nav a:hover {
    color: var(--gh-accent-blue);
    background-color: rgba(177, 186, 196, 0.12);
}

.gh-search-mock {
    display: flex;
    align-items: center;
    background-color: var(--gh-canvas-subtle);
    border: 1px solid var(--gh-border-default);
    border-radius: var(--radius-md);
    padding: 5px 12px;
    color: var(--gh-fg-muted);
    font-size: 13px;
    gap: 8px;
    width: 240px;
    cursor: pointer;
    transition: var(--transition);
}

.gh-search-mock:hover {
    border-color: var(--gh-fg-muted);
}

.gh-search-mock kbd {
    margin-left: auto;
    background: var(--gh-canvas-overlay);
    border: 1px solid var(--gh-border-default);
    border-radius: 3px;
    padding: 1px 5px;
    font-size: 11px;
    font-family: var(--font-mono);
}

.gh-header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ============================================================
   Buttons
   ============================================================ */

.btn-gh {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 500;
    padding: 6px 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    line-height: 20px;
    white-space: nowrap;
    border: 1px solid transparent;
}

.btn-gh-primary {
    background-color: var(--gh-btn-primary-bg);
    color: #ffffff;
    border-color: var(--gh-btn-primary-border);
    box-shadow: 0 1px 0 rgba(27, 31, 36, 0.1);
}

.btn-gh-primary:hover {
    background-color: var(--gh-btn-primary-hover);
    color: #ffffff;
    text-decoration: none;
}

.btn-gh-secondary {
    background-color: var(--gh-canvas-overlay);
    color: var(--gh-fg-default);
    border-color: var(--gh-border-default);
}

.btn-gh-secondary:hover {
    background-color: #30363d;
    border-color: #8b949e;
    color: var(--gh-fg-default);
    text-decoration: none;
}

.btn-gh-large {
    font-size: 16px;
    padding: 10px 20px;
    font-weight: 600;
}

/* ============================================================
   Hero Section
   ============================================================ */

.gh-hero {
    position: relative;
    max-width: 1280px;
    margin: 0 auto;
    padding: 72px 24px 48px;
    z-index: 1;
}

.gh-repo-badge-bar {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--gh-canvas-subtle);
    border: 1px solid var(--gh-border-default);
    border-radius: var(--radius-full);
    padding: 4px 14px;
    font-size: 13px;
    color: var(--gh-fg-muted);
    margin-bottom: 24px;
}

.gh-repo-badge-bar .badge-label {
    color: var(--gh-accent-green);
    font-weight: 600;
    font-family: var(--font-mono);
}

.gh-repo-badge-bar .badge-stars {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--gh-fg-default);
}

.gh-hero-title {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -1.5px;
    margin-bottom: 20px;
    max-width: 860px;
}

.gh-gradient-text {
    background: linear-gradient(92deg, #58a6ff 0%, #bc8cff 50%, #3fb950 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.gh-hero-subtitle {
    font-size: 18px;
    color: var(--gh-fg-muted);
    max-width: 720px;
    line-height: 1.6;
    margin-bottom: 32px;
}

.gh-hero-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

/* ============================================================
   Terminal / Interactive Demo Box
   ============================================================ */

.gh-code-window {
    background-color: var(--gh-canvas-subtle);
    border: 1px solid var(--gh-border-default);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.05);
}

.gh-code-header {
    background-color: var(--gh-canvas-default);
    border-bottom: 1px solid var(--gh-border-default);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.gh-window-dots {
    display: flex;
    gap: 6px;
}

.gh-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.gh-dot.red { background-color: #ff5f56; }
.gh-dot.yellow { background-color: #ffbd2e; }
.gh-dot.green { background-color: #27c93f; }

.gh-code-title {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--gh-fg-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.gh-code-body {
    padding: 24px;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    color: var(--gh-fg-default);
}

.gh-token-comment { color: var(--gh-fg-subtle); }
.gh-token-keyword { color: #ff7b72; }
.gh-token-string { color: #a5d6ff; }
.gh-token-fn { color: #d2a8ff; }
.gh-token-number { color: #79c0ff; }
.gh-token-tag { color: #7ee787; }

/* ============================================================
   Bento Grid & Features
   ============================================================ */

.gh-section {
    max-width: 1280px;
    margin: 0 auto;
    padding: 80px 24px;
}

.gh-section-header {
    margin-bottom: 48px;
}

.gh-section-header h2 {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.8px;
    margin-bottom: 8px;
}

.gh-section-header p {
    font-size: 16px;
    color: var(--gh-fg-muted);
    max-width: 600px;
}

.gh-bento-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 24px;
}

.gh-card {
    background-color: var(--gh-canvas-subtle);
    border: 1px solid var(--gh-border-default);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.gh-card:hover {
    border-color: #58a6ff;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.gh-card-span-8 { grid-column: span 8; }
.gh-card-span-4 { grid-column: span 4; }
.gh-card-span-6 { grid-column: span 6; }
.gh-card-span-12 { grid-column: span 12; }

.gh-card-icon {
    font-size: 24px;
    margin-bottom: 16px;
    color: var(--gh-accent-blue);
}

.gh-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
    letter-spacing: -0.3px;
}

.gh-card p {
    color: var(--gh-fg-muted);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 20px;
}

/* Activity Heatmap Mockup */
.gh-heatmap-mock {
    display: flex;
    gap: 4px;
    margin-top: 16px;
    overflow-x: auto;
    padding-bottom: 8px;
}

.gh-heatmap-col {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.gh-heatmap-cell {
    width: 12px;
    height: 12px;
    border-radius: 2px;
    background-color: #161b22;
    border: 1px solid rgba(255, 255, 255, 0.04);
}

.gh-heatmap-cell.l1 { background-color: #0e4429; }
.gh-heatmap-cell.l2 { background-color: #006d32; }
.gh-heatmap-cell.l3 { background-color: #26a641; }
.gh-heatmap-cell.l4 { background-color: #39d353; }

/* Stat Highlights */
.gh-stat-row {
    display: flex;
    gap: 24px;
    margin-top: 16px;
}

.gh-stat-item {
    display: flex;
    flex-direction: column;
}

.gh-stat-item .num {
    font-size: 28px;
    font-weight: 700;
    color: var(--gh-fg-default);
    font-family: var(--font-mono);
}

.gh-stat-item .label {
    font-size: 12px;
    color: var(--gh-fg-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ============================================================
   DPDP Act & Trust Banner
   ============================================================ */

.gh-trust-section {
    background-color: var(--gh-canvas-subtle);
    border-top: 1px solid var(--gh-border-default);
    border-bottom: 1px solid var(--gh-border-default);
    padding: 48px 24px;
}

.gh-trust-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    flex-wrap: wrap;
}

.gh-trust-text {
    max-width: 700px;
}

.gh-trust-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--gh-accent-green);
    font-weight: 600;
    font-size: 13px;
    margin-bottom: 8px;
}

.gh-trust-text h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
}

.gh-trust-text p {
    color: var(--gh-fg-muted);
    font-size: 14px;
}

/* ============================================================
   Footer
   ============================================================ */

.gh-footer {
    border-top: 1px solid var(--gh-border-default);
    background-color: var(--gh-canvas-default);
    padding: 64px 24px 32px;
}

.gh-footer-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.gh-footer-col h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--gh-fg-default);
    margin-bottom: 16px;
}

.gh-footer-col ul {
    list-style: none;
}

.gh-footer-col ul li {
    margin-bottom: 10px;
}

.gh-footer-col ul li a {
    color: var(--gh-fg-muted);
    font-size: 13px;
}

.gh-footer-col ul li a:hover {
    color: var(--gh-accent-blue);
    text-decoration: underline;
}

.gh-footer-bottom {
    max-width: 1280px;
    margin: 0 auto;
    border-top: 1px solid var(--gh-border-muted);
    padding-top: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    color: var(--gh-fg-subtle);
    font-size: 12px;
}

.gh-footer-links {
    display: flex;
    gap: 16px;
}

.gh-footer-links a {
    color: var(--gh-fg-subtle);
    font-size: 12px;
}

/* ============================================================
   Responsive Breakpoints
   ============================================================ */

@media (max-width: 960px) {
    .gh-hero-title { font-size: 40px; }
    .gh-card-span-8, .gh-card-span-4, .gh-card-span-6 { grid-column: span 12; }
    .gh-footer-inner { grid-template-columns: 1fr 1fr; gap: 32px; }
    .gh-search-mock { display: none; }
}

@media (max-width: 640px) {
    .gh-hero-title { font-size: 32px; }
    .gh-nav { display: none; }
    .gh-footer-inner { grid-template-columns: 1fr; }
}