:root {
  --ink: #15172a;
  --ink-soft: #4a4a6a;
  --muted: #6b6d8a;
  --line: #e9e6df;
  --paper: #faf7f0;
  --paper-warm: #fff4e6;
  --surface: #ffffff;
  --purple: #764ba2;
  --purple-deep: #4f2d80;
  --purple-soft: #efe9f7;
  --coral: #ff6b5b;
  --coral-deep: #e8523f;
  --amber: #ffc04a;
  --mint: #a6e3a1;
  --radius: 18px;
  --radius-pill: 999px;
  --shadow-soft: 0 1px 2px rgba(20, 20, 40, 0.04), 0 8px 24px rgba(20, 20, 40, 0.06);
  --shadow-press: 0 1px 2px rgba(20, 20, 40, 0.08), 0 12px 32px rgba(20, 20, 40, 0.12);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--purple);
  text-decoration: none;
  border-bottom: 1px solid rgba(118, 75, 162, 0.25);
  transition: border-color 0.2s, color 0.2s;
}

a:hover {
  color: var(--purple-deep);
  border-bottom-color: var(--purple);
}

/* ---- Navbar ---- */

.navbar {
  background: linear-gradient(90deg, #2d3561 0%, #764ba2 50%, #667eea 100%);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  min-height: 80px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  border-bottom: none;
  padding: 0.5rem 0;
}

.nav-brand:hover {
  border-bottom: none;
}

.logo {
  height: 56px;
  flex-shrink: 0;
  filter:
    drop-shadow(0 0 4px rgba(255, 255, 255, 0.6))
    drop-shadow(0 0 8px rgba(255, 255, 255, 0.35));
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.brand-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: white;
  margin: 0;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.brand-tagline {
  font-size: 0.95rem;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
  line-height: 1.2;
  font-style: italic;
  letter-spacing: 0;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 0.35rem;
  margin: 0;
  align-items: center;
}

.nav-menu a {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-pill);
  border-bottom: none;
  transition: background 0.2s, color 0.2s;
}

.nav-menu a:hover {
  background: rgba(255, 255, 255, 0.12);
  color: white;
  border-bottom: none;
}

.nav-menu a.active {
  background: rgba(255, 255, 255, 0.18);
  color: white;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.25);
}

/* ---- Layout ---- */

.main-prose {
  max-width: 920px;
  margin: 0 auto;
  padding: 5rem 2rem 6rem;
}

.main-home {
  padding: 0 0 4rem;
}

/* ---- Typography ---- */

h1, h2, h3, h4 {
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  margin: 0 0 1.5rem;
}

h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  margin: 4rem 0 1.25rem;
  letter-spacing: -0.015em;
}

h3 {
  font-size: 1.35rem;
  margin: 2.5rem 0 0.85rem;
}

p {
  margin-bottom: 1.15rem;
  color: var(--ink-soft);
}

ul, ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  color: var(--ink-soft);
}

li {
  margin-bottom: 0.5rem;
}

strong {
  color: var(--ink);
  font-weight: 600;
}

/* ---- Hero ---- */

.hero-section {
  padding: 6rem 2rem 3rem;
  max-width: 1120px;
  margin: 0 auto;
  text-align: center;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--purple);
  background: var(--purple-soft);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.035em;
  color: var(--ink);
  margin-bottom: 1.5rem;
}

.hero-title em {
  font-style: normal;
  background: linear-gradient(120deg, var(--coral) 0%, var(--purple) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: 1.2rem;
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 36rem;
  margin: 0 auto 2.25rem;
}

.hero-section .cta-row {
  justify-content: center;
}

/* ---- Buttons ---- */

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin: 2rem 0 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.75rem;
  border-radius: var(--radius-pill);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1px);
  border-bottom: none;
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
  box-shadow: var(--shadow-soft);
}

.btn-primary:hover {
  background: var(--purple-deep);
  color: var(--paper);
  box-shadow: var(--shadow-press);
}

.btn-accent {
  background: var(--coral);
  color: white;
  box-shadow: var(--shadow-soft);
}

.btn-accent:hover {
  background: var(--coral-deep);
  color: white;
  box-shadow: var(--shadow-press);
}

.btn-secondary {
  background: var(--surface);
  color: var(--ink);
  border: 1.5px solid var(--line);
}

.btn-secondary:hover {
  border-color: var(--ink);
  background: var(--surface);
  color: var(--ink);
}

.btn .arrow {
  transition: transform 0.15s ease;
}

.btn:hover .arrow {
  transform: translateX(3px);
}

/* ---- Sections (home) ---- */

.section {
  padding: 5rem 2rem;
  max-width: 1180px;
  margin: 0 auto;
}

.section-narrow {
  max-width: 920px;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-lead {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 38rem;
  margin-bottom: 3rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

@media (max-width: 640px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  border-radius: var(--radius);
  padding: 2.25rem 2rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 1.75rem;
  left: 2rem;
  width: 36px;
  height: 4px;
  border-radius: 999px;
  background: currentColor;
  opacity: 0.85;
}

.feature-card h3 {
  margin: 1.75rem 0 0.6rem;
  font-size: 1.25rem;
  letter-spacing: -0.015em;
}

.feature-card p {
  font-size: 1rem;
  margin: 0;
  color: var(--ink-soft);
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

.feature-card-coral,
.feature-card-purple,
.feature-card-amber,
.feature-card-mint {
  background: #f3eef9;
}

.feature-card-coral { color: #4f2d80; }
.feature-card-purple { color: #764ba2; }
.feature-card-amber { color: #667eea; }
.feature-card-mint { color: #2d3561; }

.feature-card h3 { color: var(--ink); }

/* Banded sections */

.band {
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.band-warm {
  background: var(--paper-warm);
  border-top: 1px solid #f3e3c8;
  border-bottom: 1px solid #f3e3c8;
}

/* Final CTA */

.cta-banner {
  background: linear-gradient(180deg, #6e65c6 0%, #764ba2 100%);
  color: var(--paper);
  border-radius: 28px;
  padding: 4rem 3rem;
  margin: 5rem auto;
  max-width: 1120px;
  text-align: center;
}

.cta-banner h2 {
  color: white;
  font-size: clamp(2rem, 4vw, 3rem);
  margin: 0 0 1rem;
  letter-spacing: -0.025em;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.15rem;
  max-width: 32rem;
  margin: 0 auto 2rem;
}

.cta-banner .btn-accent {
  background: var(--coral);
}

.cta-banner .btn-secondary {
  background: transparent;
  color: white;
  border-color: rgba(255, 255, 255, 0.35);
}

.cta-banner .btn-secondary:hover {
  border-color: white;
  color: white;
  background: rgba(255, 255, 255, 0.08);
}

.cta-banner .cta-row {
  justify-content: center;
}

/* ---- Code & terminal ---- */

pre {
  background: #1a1b2e;
  color: #cdd6f4;
  padding: 1.5rem 1.75rem;
  overflow-x: auto;
  border-radius: 14px;
  margin: 2rem 0;
  line-height: 1.6;
  font-size: 0.92rem;
  box-shadow: var(--shadow-soft);
}

code {
  font-family: ui-monospace, 'SF Mono', 'Cascadia Code', monospace;
  font-size: 0.92em;
}

p code, li code, td code {
  background: var(--purple-soft);
  color: var(--purple-deep);
  padding: 0.1em 0.45em;
  border-radius: 6px;
  font-size: 0.9em;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* Allium syntax highlighting */
.allium-keyword { color: #cba6f7; }
.allium-type { color: #89b4fa; }
.allium-field { color: #f9e2af; }
.allium-string { color: #a6e3a1; }
.allium-comment { color: #6c7086; font-style: italic; }
.allium-operator { color: #f38ba8; }
.allium-number { color: #fab387; }
.allium-property { color: #94e2d5; }
.allium-punctuation { color: #9399b2; }
.allium-builtin { color: #f5c2e7; }

/* Notice callout */
.notice {
  background: var(--paper-warm);
  border: 1px solid #f3e3c8;
  border-left: 4px solid var(--amber);
  padding: 1.5rem 1.75rem;
  border-radius: 0 14px 14px 0;
  margin: 2rem 0;
  font-size: 1rem;
  color: var(--ink);
  line-height: 1.6;
}

.video {
  position: relative;
  margin: 2rem 0;
  border-radius: 16px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #000;
  box-shadow: var(--shadow-soft);
}

.video iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.terminal {
  background: #1a1b2e;
  border-radius: 16px;
  margin: 2rem 0;
  overflow: hidden;
  font-family: ui-monospace, 'SF Mono', 'Cascadia Code', monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  box-shadow: var(--shadow-soft);
}

.terminal-titlebar {
  background: #25263d;
  padding: 0.6rem 1rem;
  display: flex;
  align-items: center;
  position: relative;
}

.terminal-dots {
  display: flex;
  gap: 0.5rem;
}

.terminal-title {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.8rem;
}

.terminal-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.terminal-dot.red { background: #f38ba8; }
.terminal-dot.yellow { background: #f9e2af; }
.terminal-dot.green { background: #a6e3a1; }

.terminal-body { padding: 0; }

.terminal .turn {
  padding: 0.85rem 1.5rem 0.85rem calc(1.5rem + 2ch);
  text-indent: -2ch;
}

.terminal .user {
  background: #2a2b44;
  color: #cdd6f4;
}

.terminal .user .prompt {
  color: #a6e3a1;
  font-weight: 600;
}

.terminal .llm {
  background: #1a1b2e;
  color: #bac2de;
  padding-left: calc(2.75rem + 2ch);
}

.terminal .llm .marker {
  color: #e07858;
  font-size: 1.3em;
  line-height: 0;
  vertical-align: middle;
}

.terminal .llm code,
.terminal .user code {
  color: inherit;
  background: none;
  padding: 0;
  font-size: inherit;
  font-weight: 600;
}

/* Tables */

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0 2rem;
  font-size: 0.975rem;
  background: var(--surface);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

th, td {
  text-align: left;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--line);
}

th {
  background: var(--paper);
  font-weight: 600;
  color: var(--ink);
}

tr:last-child td { border-bottom: none; }

/* Footer */

footer {
  border-top: 1px solid var(--line);
  background: var(--paper);
  padding: 2.5rem 2rem;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

footer p { margin: 0; color: var(--muted); }

footer a {
  color: var(--muted);
  border-bottom: 1px solid transparent;
}

footer a:hover {
  color: var(--purple);
  border-bottom-color: var(--purple);
}

/* Responsive */

@media (max-width: 900px) {
  .hero-section {
    padding: 4rem 1.5rem 2rem;
  }

  .main-prose { padding: 3rem 1.5rem 4rem; }

  .section { padding: 4rem 1.5rem; }

  .cta-banner {
    margin: 3rem 1.25rem;
    padding: 3rem 1.75rem;
  }
}

@media (max-width: 640px) {
  .nav-container {
    padding: 0.75rem 1rem;
    gap: 0.5rem;
    flex-wrap: wrap;
  }

  .nav-brand { gap: 0.6rem; }

  .logo { height: 36px; }

  .brand-title { font-size: 1.2rem; }

  .brand-tagline { font-size: 0.7rem; }

  .nav-menu {
    gap: 0;
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 0.25rem;
  }

  .nav-menu a {
    font-size: 0.85rem;
    padding: 0.45rem 0.75rem;
  }

  h2 { margin-top: 3rem; }
}