@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Playfair+Display:ital@0;1&family=Geist+Mono:wght@400;500&display=swap');

:root {
  --canvas-base: #FFFFFF;
  --canvas-inert: #FAFAFC;
  --brand-primary: #4D0E4E;
  --border-soft: #F2F2F7;
  --ink-primary: #111112;
  --ink-muted: #636366;

  --sans: 'Plus Jakarta Sans', system-ui, sans-serif;
  --serif: 'Playfair Display', Georgia, serif;
  --mono: 'Geist Mono', 'JetBrains Mono', monospace;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 48px;
  --space-xxl: 64px;
  --space-xxl-lg: 96px;

  --max-width: 1280px;
  --radius: 10px;
}

*, *::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(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-primary);
  background: var(--canvas-base);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: opacity 0.2s;
}

a:hover {
  opacity: 0.75;
}

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

.section {
  padding: var(--space-xxl) 0;
}

.section-inert {
  background: var(--canvas-inert);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--sans);
  font-weight: 700;
  line-height: 1.15;
  color: var(--ink-primary);
  letter-spacing: -0.02em;
}

h1 {
  font-size: 48px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h3 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

h4 {
  font-size: 18px;
  font-weight: 600;
}

p {
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-muted);
}

.serif-accent {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  color: var(--brand-primary);
}

.label {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

code, pre, .mono {
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.5;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: opacity 0.2s;
  text-decoration: none;
}

.btn:hover {
  opacity: 0.85;
}

.btn-primary {
  background: var(--brand-primary);
  color: white;
}

.btn-secondary {
  background: transparent;
  color: var(--brand-primary);
  border: 1px solid var(--brand-primary);
}

.btn-white {
  background: white;
  color: var(--brand-primary);
}

.btn-outline-white {
  background: transparent;
  color: white;
  border: 1px solid rgba(255,255,255,0.4);
}

.btn-outline-white:hover {
  border-color: rgba(255,255,255,0.8);
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--canvas-base);
  border-bottom: 1px solid var(--border-soft);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 20px;
  color: var(--ink-primary);
  text-decoration: none;
}

.logo-img {
  height: 28px;
  width: auto;
}

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

.nav a {
  padding: var(--space-sm) 14px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-muted);
  text-decoration: none;
  transition: color 0.2s, background 0.2s;
}

.nav a:hover {
  color: var(--brand-primary);
  background: var(--canvas-inert);
  opacity: 1;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: var(--space-sm) var(--space-sm);
  cursor: pointer;
  color: var(--ink-primary);
}

.mobile-menu {
  display: none;
  padding: var(--space-md) 0;
  border-top: 1px solid var(--border-soft);
}

.mobile-menu.open {
  display: block;
}

.mobile-menu a {
  display: block;
  padding: 10px var(--space-md);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-primary);
  text-decoration: none;
}

.mobile-menu a:hover {
  background: var(--canvas-inert);
}

.mobile-menu .btn {
  margin-top: var(--space-sm);
  justify-content: center;
}

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

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.hero h1 {
  margin-bottom: var(--space-md);
}

.hero p {
  font-size: 18px;
  margin-bottom: var(--space-lg);
  color: var(--ink-muted);
}

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

.hero-visual {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--canvas-inert);
}

.hero-visual iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* Cards */
.card {
  background: var(--canvas-base);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: var(--space-lg);
  transition: border-color 0.2s;
}

.card:hover {
  border-color: var(--brand-primary);
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  background: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  flex-shrink: 0;
}

.card-icon svg {
  width: 20px;
  height: 20px;
  color: white;
}

.card h3 {
  margin-bottom: var(--space-sm);
}

.card p {
  font-size: 14px;
}

.card-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  transition: border-color 0.2s;
}

.card-row:hover {
  border-color: var(--brand-primary);
}

.card-row .card-icon {
  width: 36px;
  height: 36px;
  margin-bottom: 0;
}

.card-row h4 {
  font-size: 16px;
  margin-bottom: var(--space-xs);
}

.card-row p {
  font-size: 13px;
}

.card-tag {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--brand-primary);
  font-weight: 500;
}

/* Cards grid */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-lg);
}

.grid-4 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: var(--space-lg);
}

.grid-2col-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

/* Process step */
.process-step {
  padding: var(--space-md);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  transition: border-color 0.2s;
}

.process-step:hover {
  border-color: var(--brand-primary);
}

.step-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--brand-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  margin-bottom: var(--space-md);
}

.process-step h3 {
  margin-bottom: var(--space-sm);
  font-size: 18px;
}

.process-step p {
  font-size: 13px;
  margin-bottom: var(--space-xs);
}

.process-step strong {
  color: var(--ink-primary);
}

/* Methodology row */
.methodology {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md);
}

.methodology-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--canvas-inert);
  border: 1px solid var(--border-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.methodology-icon svg {
  width: 16px;
  height: 16px;
  color: var(--brand-primary);
}

.methodology h3 {
  font-size: 16px;
  margin-bottom: var(--space-xs);
}

.methodology p {
  font-size: 13px;
}

/* Benefit card */
.benefit {
  text-align: center;
  padding: var(--space-lg);
}

.benefit-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md);
}

.benefit-icon svg {
  width: 24px;
  height: 24px;
  color: white;
}

.benefit h3 {
  margin-bottom: var(--space-xs);
}

.benefit p {
  font-size: 14px;
}

/* Contact card */
.contact-card {
  text-align: center;
  padding: var(--space-lg);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  transition: border-color 0.2s;
}

.contact-card:hover {
  border-color: var(--brand-primary);
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
}

.footer-brand p {
  font-size: 13px;
  margin-top: var(--space-sm);
}

.footer h4 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
  color: var(--ink-primary);
}

.footer ul {
  list-style: none;
}

.footer li {
  margin-bottom: var(--space-sm);
}

.footer a {
  font-size: 13px;
  color: var(--ink-muted);
  text-decoration: none;
}

.footer a:hover {
  color: var(--brand-primary);
  opacity: 1;
}

.footer-bottom {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-soft);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--ink-muted);
}

/* Prose (for markdown content) */
.prose {
  max-width: 720px;
  color: var(--ink-muted);
}

.prose h1 {
  font-size: 36px;
  margin-bottom: var(--space-lg);
}

.prose h2 {
  font-size: 24px;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border-soft);
}

.prose h3 {
  font-size: 18px;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.prose p {
  margin-bottom: var(--space-md);
}

.prose ul, .prose ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
}

.prose li {
  margin-bottom: var(--space-xs);
}

.prose strong {
  color: var(--ink-primary);
}

.prose code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--canvas-inert);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-soft);
  color: var(--brand-primary);
}

.prose pre {
  background: var(--canvas-inert);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: var(--space-md);
  overflow-x: auto;
  margin-bottom: var(--space-md);
}

.prose pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--ink-primary);
}

.prose blockquote {
  border-left: 3px solid var(--brand-primary);
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-md);
  background: var(--canvas-inert);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--border-soft);
  margin: var(--space-xl) 0;
}

/* Spec index */
.spec-card {
  display: block;
  padding: var(--space-lg);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink-primary);
  transition: border-color 0.2s;
}

.spec-card:hover {
  border-color: var(--brand-primary);
  opacity: 1;
}

.spec-card h2 {
  font-size: 22px;
  margin-bottom: var(--space-sm);
}

.spec-card p {
  font-size: 14px;
  margin-bottom: var(--space-md);
}

.spec-card .spec-meta {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  font-size: 12px;
}

.spec-card .version-badge {
  font-family: var(--mono);
  font-size: 11px;
  padding: 2px 6px;
  border: 1px solid var(--border-soft);
  border-radius: 4px;
  color: var(--ink-muted);
}

.spec-card .read-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Docs layout */
.docs-grid {
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: var(--space-xl);
}

.docs-sidebar {
  position: sticky;
  top: 88px;
  align-self: start;
}

.docs-sidebar h3 {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-muted);
  margin-bottom: var(--space-md);
}

.docs-sidebar ul {
  list-style: none;
}

.docs-sidebar li {
  margin-bottom: var(--space-xs);
}

.docs-sidebar a {
  font-size: 14px;
  color: var(--ink-muted);
  padding: 6px 10px;
  border-radius: 6px;
  display: block;
}

.docs-sidebar a:hover {
  background: var(--canvas-inert);
  color: var(--brand-primary);
  opacity: 1;
}

.docs-sidebar .back-link {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 13px;
  font-weight: 600;
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-soft);
}

.docs-meta {
  margin-bottom: var(--space-lg);
}

.docs-meta-item {
  font-size: 12px;
  color: var(--ink-muted);
  margin-bottom: var(--space-xs);
}

.docs-meta-item strong {
  color: var(--ink-primary);
}

/* Iframe container */
.iframe-card {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: var(--space-sm);
  overflow: hidden;
}

.iframe-card iframe {
  width: 100%;
  border: none;
}

/* Scroll reveal */
.scroll-reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Section header */
.section-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.section-header p {
  font-size: 18px;
  max-width: 600px;
  margin: var(--space-md) auto 0;
}

/* Responsive */
@media (max-width: 1024px) {
  h1 { font-size: 36px; }
  h2 { font-size: 26px; }

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

  .grid-2, .grid-2col-layout {
    grid-template-columns: 1fr;
  }

  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }

  .grid-4 {
    grid-template-columns: 1fr 1fr;
  }

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

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

  .docs-sidebar {
    position: static;
  }
}

@media (max-width: 640px) {
  .nav { display: none; }
  .header-cta { display: none; }
  .mobile-menu-btn { display: block; }

  h1 { font-size: 28px; }
  h2 { font-size: 22px; }
  h3 { font-size: 18px; }

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

  .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

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

  .hero-actions {
    flex-direction: column;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}