:root {
    --color-bg: #0D0D0D; --color-surface: #1A1A1A; --color-text: #E8E4DF;
    --color-text-muted: #8A8580; --color-accent: #D4A853; --color-accent-hover: #E0B86A;
    --color-code: #7B9EB8; --color-border: #2A2A2A; --color-border-hover: #3A3A3A;
    --color-success: #6BA368;
    --font-heading: 'Space Grotesk', system-ui, sans-serif;
    --font-body: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --font-mono: 'JetBrains Mono', ui-monospace, 'Cascadia Code', monospace;
    --space-xs: 0.25rem; --space-sm: 0.5rem; --space-md: 1rem;
    --space-lg: 1.5rem; --space-xl: 2.5rem; --space-2xl: 4rem;
    --space-3xl: 6rem; --space-section: 4rem;
    --radius-sm: 4px; --radius-md: 6px; --radius-lg: 8px;
    --transition-fast: 150ms ease; --transition: 200ms ease;
    --max-width: 896px;
}

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

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

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
}

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

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(13, 13, 13, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 3.75rem;
}

.nav-logo {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.nav-logo:hover { color: var(--color-text); }
.logo-accent { color: var(--color-accent); }

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-links a {
    color: var(--color-text-muted);
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color var(--transition);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9375rem;
    padding: 0.625rem 1.5rem;
    border-radius: var(--radius-md);
    border: 1.5px solid transparent;
    cursor: pointer;
    transition: filter var(--transition), color var(--transition), border-color var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    filter: brightness(1.15);
    color: var(--color-bg);
}

.btn-outline {
    border-color: var(--color-border);
    color: var(--color-text);
}

.btn-outline:hover {
    filter: brightness(1.25);
    border-color: var(--color-border-hover);
}

.btn-sm {
    padding: 0.375rem 1rem;
    font-size: 0.8125rem;
    border-radius: var(--radius-sm);
}

/* Hero */
.hero {
    padding: var(--space-section) 0 var(--space-xl);
}

.hero-badge {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: var(--color-text);
}

.hero-sub {
    margin-top: var(--space-sm);
    font-size: 1.0625rem;
    color: var(--color-text-muted);
    max-width: 520px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-lg);
    flex-wrap: wrap;
}

/* Sections */
section {
    padding: var(--space-section) 0;
}

section h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-lg);
}

section p {
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

/* Architecture diagram */
.arch-flow {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin: var(--space-xl) 0;
}

.arch-node {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-md) var(--space-lg);
    text-align: center;
    flex: 1;
    min-width: 140px;
}

.arch-node .node-label {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.arch-node .node-detail {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.arch-arrow {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    color: var(--color-accent);
    flex-shrink: 0;
}

/* Steps */
.steps {
    counter-reset: step;
}

.step {
    position: relative;
    padding-left: 2.5rem;
    margin-bottom: var(--space-xl);
}

.step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 1.75rem;
    height: 1.75rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-accent);
}

.step h3 {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.step p {
    font-size: 0.9375rem;
}

/* Code blocks */
code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-code);
    background: var(--color-surface);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
}

pre {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    overflow-x: auto;
    margin: var(--space-md) 0;
}

pre code {
    background: none;
    padding: 0;
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--color-text);
}

/* Payload */
.payload-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xs);
}

.key { color: var(--color-accent); }
.str { color: var(--color-success); }
.bool { color: var(--color-code); }

/* Footer */
.site-footer {
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--color-border);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-footer p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-bottom: 0;
}

.powered-by { font-size: 0.75rem; opacity: 0.5; }
.powered-by a { color: var(--color-text-muted); text-decoration: underline; text-underline-offset: 2px; }
.powered-by a:hover { opacity: 1; }

/* Mobile */
@media (max-width: 640px) {
    .hero { padding: var(--space-2xl) 0 var(--space-lg); }
    .arch-flow { flex-direction: column; }
    .arch-arrow { transform: rotate(90deg); }
    .footer-inner { flex-direction: column; gap: 0.25rem; text-align: center; }
    .nav-links { gap: var(--space-sm); }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { text-align: center; justify-content: center; }
    .nav-links a:not(.btn) { display: none; }
}

@media (min-width: 640px) {
    :root { --space-section: 5rem; }
    .hero h1 { font-size: 3.25rem; }
    .hero-sub { font-size: 1.125rem; }
}