@import url('https://fonts.googleapis.com/css2?family=Caveat:wght@400;600;700&family=Inter:wght@400;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --parchment: #faf3e0;
  --parchment-dark: #efe3c8;
  --parchment-deeper: #e4d5b0;
  --ink: #2c1810;
  --ink-light: #6b4c3b;
  --ink-faint: #a08060;
  --golden: #c8960c;
  --golden-light: #f0d060;
  --golden-glow: rgba(200, 150, 12, 0.15);
  --success: #2d7a3e;
  --success-bg: rgba(45, 122, 62, 0.08);
  --failure: #a63d40;
  --failure-bg: rgba(166, 61, 64, 0.08);
  --blue: #2563eb;
  --blue-bg: rgba(37, 99, 235, 0.08);
  --purple: #7c3aed;
  --purple-bg: rgba(124, 58, 237, 0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 12px rgba(44, 24, 16, 0.08);
  --shadow-lg: 0 8px 32px rgba(44, 24, 16, 0.12);
  --max-width: 1200px;
  --content-width: 800px;
}

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

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--parchment);
  color: var(--ink);
  line-height: 1.7;
  overflow-x: hidden;
}

/* Parchment texture */
body::before {
  content: '';
  position: fixed; inset: 0;
  background:
    radial-gradient(ellipse at 15% 50%, rgba(140,110,50,0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 25%, rgba(130,95,45,0.05) 0%, transparent 45%),
    radial-gradient(ellipse at 50% 85%, rgba(100,80,30,0.04) 0%, transparent 35%);
  pointer-events: none;
  z-index: 0;
}

/* ─── Nav ─── */
nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(250, 243, 224, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--parchment-dark);
  padding: 0 24px;
}
nav .nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
nav .logo {
  font-family: 'Caveat', cursive;
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
}
nav .logo span { color: var(--golden); }
nav .nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
}
nav .nav-links a {
  text-decoration: none;
  color: var(--ink-light);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}
nav .nav-links a:hover,
nav .nav-links a.active {
  color: var(--ink);
  background: var(--golden-glow);
}
nav .nav-links .cta-link {
  background: var(--ink);
  color: var(--parchment);
  font-weight: 600;
}
nav .nav-links .cta-link:hover {
  background: var(--ink-light);
  color: var(--parchment);
}

/* ─── Sections ─── */
section {
  position: relative;
  z-index: 1;
  padding: 80px 24px;
}
.container {
  max-width: var(--max-width);
  margin: 0 auto;
}
.narrow {
  max-width: var(--content-width);
  margin: 0 auto;
}

/* ─── Hero ─── */
.hero {
  padding: 160px 24px 100px;
  text-align: center;
}
.hero h1 {
  font-family: 'Caveat', cursive;
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 8px;
}
.hero h1 span { color: var(--golden); }
.hero .subtitle {
  font-size: clamp(18px, 3vw, 22px);
  color: var(--ink-light);
  max-width: 600px;
  margin: 0 auto 12px;
  line-height: 1.5;
}
.hero .tagline {
  font-family: 'Caveat', cursive;
  font-size: 17px;
  color: var(--ink-faint);
  margin-bottom: 36px;
}
.hero .cta-group {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}
.btn-primary {
  background: var(--ink);
  color: var(--parchment);
}
.btn-primary:hover {
  background: var(--ink-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}
.btn-secondary {
  background: var(--parchment-dark);
  color: var(--ink);
  border: 1px solid var(--parchment-deeper);
}
.btn-secondary:hover {
  background: var(--parchment-deeper);
  transform: translateY(-1px);
}
.btn-golden {
  background: var(--golden);
  color: white;
}
.btn-golden:hover {
  background: #b08508;
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

/* ─── Cards ─── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 48px;
}
.card {
  background: white;
  border: 1px solid var(--parchment-dark);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all 0.2s;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--golden);
}
.card .icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}
.card .icon.parallel { background: var(--blue-bg); }
.card .icon.knowledge { background: var(--golden-glow); }
.card .icon.gaming { background: var(--failure-bg); }
.card .icon.batch { background: var(--success-bg); }
.card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}
.card p {
  font-size: 14px;
  color: var(--ink-light);
  line-height: 1.6;
}

/* ─── Stats ─── */
.stats-row {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  margin: 48px 0;
}
.stat {
  text-align: center;
}
.stat .number {
  font-family: 'Caveat', cursive;
  font-size: 48px;
  font-weight: 700;
  color: var(--golden);
  line-height: 1;
}
.stat .label {
  font-size: 14px;
  color: var(--ink-light);
  margin-top: 4px;
}

/* ─── Section Headers ─── */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-header h2 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 12px;
}
.section-header p {
  font-size: 17px;
  color: var(--ink-light);
  max-width: 600px;
  margin: 0 auto;
}

/* ─── Architecture Diagram ─── */
.architecture {
  background: white;
  border: 1px solid var(--parchment-dark);
  border-radius: var(--radius);
  padding: 40px;
  margin: 48px 0;
  overflow-x: auto;
}
.architecture pre {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink);
  white-space: pre;
  overflow-x: auto;
}

/* ─── Flow Diagram ─── */
.flow-diagram {
  max-width: 700px;
  margin: 48px auto 0;
}
.flow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.flow-box {
  background: white;
  border: 2px solid var(--parchment-dark);
  border-radius: var(--radius);
  padding: 20px 28px;
  text-align: center;
  width: 100%;
  max-width: 480px;
  transition: border-color 0.2s;
}
.flow-box:hover {
  border-color: var(--golden);
}
.flow-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}
.flow-desc {
  font-size: 13px;
  color: var(--ink-light);
  line-height: 1.5;
}
.flow-arrow {
  font-size: 24px;
  color: var(--ink-faint);
  padding: 8px 0;
}
.flow-workers {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  width: 100%;
}
.flow-worker {
  max-width: none;
  padding: 16px 12px;
  background: var(--blue-bg);
  border-color: rgba(37, 99, 235, 0.2);
}
.flow-worker .flow-title {
  font-size: 13px;
}
.flow-worker .flow-desc {
  font-size: 11px;
}
.flow-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--ink-faint);
  margin: 12px 0 4px;
  text-align: center;
}
.flow-program { border-color: var(--golden); background: var(--golden-glow); }
.flow-coordinator { border-color: var(--purple); background: var(--purple-bg); }
.flow-results { background: var(--parchment); }
.flow-maze { border-color: var(--success); background: var(--success-bg); }
.flow-viz { border-color: var(--golden); background: var(--golden-glow); }

@media (max-width: 768px) {
  .flow-workers { grid-template-columns: repeat(2, 1fr); }
}

/* ─── Code Blocks ─── */
.code-block {
  background: #1e1e1e;
  border-radius: var(--radius);
  padding: 24px;
  margin: 24px 0;
  overflow-x: auto;
}
.code-block pre {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.6;
  color: #d4d4d4;
}
.code-block .comment { color: #6a9955; }
.code-block .keyword { color: #569cd6; }
.code-block .string { color: #ce9178; }
.code-block .function { color: #dcdcaa; }

/* ─── Expandable Sections ─── */
.expandable {
  border: 1px solid var(--parchment-dark);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
  background: white;
}
.expandable-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  user-select: none;
  transition: background 0.2s;
}
.expandable-header:hover {
  background: var(--parchment);
}
.expandable-header h3 {
  font-size: 17px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 12px;
}
.expandable-header .arrow {
  transition: transform 0.2s;
  font-size: 12px;
  color: var(--ink-faint);
}
.expandable.open .expandable-header .arrow {
  transform: rotate(90deg);
}
.expandable-body {
  display: none;
  padding: 0 24px 24px;
}
.expandable.open .expandable-body {
  display: block;
}

/* ─── Table ─── */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
}
th, td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--parchment-dark);
}
th {
  font-weight: 600;
  background: var(--parchment);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--ink-light);
}
tr:hover td {
  background: var(--parchment);
}
.danger { color: var(--failure); font-weight: 600; }

/* ─── Attribution ─── */
.attribution {
  text-align: center;
  padding: 48px 24px;
  border-top: 1px solid var(--parchment-dark);
  color: var(--ink-faint);
  font-size: 14px;
}
.attribution a {
  color: var(--golden);
  text-decoration: none;
}

/* ─── Footer ─── */
footer {
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--parchment-dark);
  color: var(--ink-faint);
  font-size: 13px;
}
footer a {
  color: var(--ink-light);
  text-decoration: none;
}

/* ─── Form Styles (starter-kit page) ─── */
.form-group {
  margin-bottom: 24px;
}
.form-group label {
  display: block;
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 8px;
  color: var(--ink);
}
.form-group .hint {
  font-size: 13px;
  color: var(--ink-faint);
  margin-bottom: 6px;
}
input[type="text"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--parchment-deeper);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 15px;
  background: white;
  color: var(--ink);
  transition: border-color 0.2s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--golden);
  box-shadow: 0 0 0 3px var(--golden-glow);
}
textarea {
  resize: vertical;
  min-height: 100px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
}

/* ─── Output Preview ─── */
.output-preview {
  background: #1e1e1e;
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 24px;
  max-height: 500px;
  overflow-y: auto;
}
.output-preview pre {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.6;
  color: #d4d4d4;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ─── Visualizer ─── */
.viz-container {
  width: 100%;
  height: calc(100vh - 60px);
  margin-top: 60px;
}
.viz-upload {
  position: fixed;
  top: 70px;
  right: 24px;
  z-index: 100;
  display: flex;
  gap: 8px;
  align-items: center;
}
.viz-upload label {
  cursor: pointer;
}

/* ─── Hamburger Menu ─── */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 4px;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 1px;
  transition: all 0.3s ease;
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .hamburger { display: flex; }
  nav .nav-links {
    display: none;
    position: absolute;
    top: 60px; left: 0; right: 0;
    background: rgba(250, 243, 224, 0.98);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--parchment-dark);
    flex-direction: column;
    padding: 12px 24px 16px;
    gap: 4px;
    box-shadow: var(--shadow);
  }
  nav .nav-links.open { display: flex; }
  nav .nav-links a { padding: 10px 14px; }
  .hero { padding: 120px 24px 60px; }
  .cards-grid { grid-template-columns: 1fr; }
  .stats-row { gap: 24px; }
  section { padding: 48px 16px; }
  .starter-grid { grid-template-columns: 1fr !important; }
}