/* === DESIGN TOKENS === */
:root {
  --bg: #0d1117;
  --bg-surface: #161b22;
  --bg-card: #1c2128;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #f0a500;
  --accent-dim: rgba(240, 165, 0, 0.15);
  --border: #30363d;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: ui-monospace, 'Cascadia Code', 'Fira Code', monospace;
  --max-w: 860px;
  --section-gap: 6rem;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* === LAYOUT === */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: var(--section-gap) 0;
}

section + section {
  border-top: 1px solid var(--border);
}

/* === TYPOGRAPHY === */
h1 { font-size: clamp(2rem, 5vw, 3rem); font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); font-weight: 600; line-height: 1.3; letter-spacing: -0.01em; margin-bottom: 1.5rem; }
h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.5rem; }

p { color: var(--text-muted); margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

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

code, .mono {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-card);
  color: var(--accent);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--border);
}

pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--text);
  margin: 1.5rem 0;
}

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  border: 1px solid var(--accent);
}
.btn-primary:hover { background: #d4920a; text-decoration: none; }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--text-muted); text-decoration: none; }

/* === CARDS === */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
}

/* === NAV === */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
}

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

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* === SECTION LABEL === */
.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

/* === TAG === */
.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.2em 0.5em;
}

/* === GRID HELPERS === */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

/* === RESPONSIVE === */
@media (max-width: 640px) {
  .nav-links { display: none; }
  section { padding: 3rem 0; }
}

/* === HERO === */
#hero {
  padding: 5rem 0 4rem;
  border-top: none;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-eyebrow::before {
  content: '';
  display: inline-block;
  width: 2rem;
  height: 1px;
  background: var(--accent);
}

.hero-title {
  margin-bottom: 1.5rem;
}

.hero-title em {
  font-style: normal;
  color: var(--accent);
}

.hero-body {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 580px;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.hero-stack {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

/* === HOW IT WORKS === */
.diagram {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2rem;
  margin: 2rem 0;
  overflow-x: auto;
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.concept-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
}

.concept-card h3 {
  color: var(--text);
  font-size: 0.95rem;
  margin-bottom: 0.4rem;
}

.concept-card p {
  font-size: 0.875rem;
  margin: 0;
}


/* === USAGE / PROMPT BLOCKS === */
.prompt-block {
  margin: 1.5rem 0;
}

.prompt-block-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.prompt-block pre {
  margin: 0;
  position: relative;
}

.copy-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.2em 0.5em;
  border-radius: 4px;
  cursor: pointer;
  transition: color 0.15s;
}

/* === POLISH === */

/* Subtle dot grid background on hero */
#hero {
  background-image: radial-gradient(circle at 1px 1px, rgba(240,165,0,0.06) 1px, transparent 0);
  background-size: 32px 32px;
}

/* Accent line left on section labels */
.section-label {
  border-left: 2px solid var(--accent);
  padding-left: 0.5rem;
}

/* Focus styles */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

/* Mobile nav fallback */
@media (max-width: 640px) {
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .concept-grid, .grid-2 { grid-template-columns: 1fr; }
  pre { font-size: 0.8rem; }
}
.copy-btn:hover { color: var(--text); }

/* === CHANGELOG === */
.changelog-list { display: flex; flex-direction: column; gap: 12px; }
.changelog-entry {
  padding: 12px 16px;
  border-left: 3px solid var(--border);
  color: var(--text-muted);
  font-size: 0.875rem;
}
.changelog-entry.changelog-new {
  border-left-color: var(--accent);
  color: var(--text);
}
.changelog-date {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}