/* AIBuilt — landing page */

:root {
  --c-bg: #f6f5f1;
  --c-bg-dark: #0f0e0c;
  --c-ink: #0f0e0c;
  --c-ink-soft: #5a554d;
  --c-ink-faint: #8a857c;
  --c-accent: #ff5b1f;
  --c-accent-soft: #ffead7;
  --c-rule: rgba(15, 14, 12, 0.1);
  --c-rule-strong: rgba(15, 14, 12, 0.18);
  --c-light-on-dark: #f6f5f1;
  --c-soft-on-dark: rgba(246, 245, 241, 0.6);
  --c-faint-on-dark: rgba(246, 245, 241, 0.32);

  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --max: 1200px;
  --gut: clamp(20px, 5vw, 64px);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246, 245, 241, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--c-rule);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px var(--gut);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--c-ink);
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 400;
  letter-spacing: -0.01em;
}
.brand-dot {
  width: 10px;
  height: 10px;
  background: var(--c-accent);
  border-radius: 50%;
  display: inline-block;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
}
.nav-links a {
  text-decoration: none;
  color: var(--c-ink-soft);
  font-weight: 500;
  font-size: 14px;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--c-ink); }
.nav-cta {
  color: var(--c-ink) !important;
  font-weight: 600 !important;
}
@media (max-width: 760px) {
  .nav-links a:not(.nav-cta) { display: none; }
}

/* hero */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(60px, 10vw, 120px) var(--gut) clamp(80px, 12vw, 140px);
}
.hero-inner { max-width: 880px; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: var(--c-bg);
  border: 1px solid var(--c-rule-strong);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--c-ink-soft);
  margin-bottom: 36px;
  font-family: var(--font-mono);
}
.badge-pulse {
  width: 8px;
  height: 8px;
  background: #1ea84a;
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(30, 168, 74, 0.6);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 0 rgba(30, 168, 74, 0.5); }
  50%      { box-shadow: 0 0 0 8px rgba(30, 168, 74, 0); }
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(60px, 10vw, 132px);
  line-height: 0.94;
  letter-spacing: -0.025em;
  margin-bottom: 36px;
}
.hero h1 em {
  font-style: italic;
  color: var(--c-accent);
}
.lede {
  font-size: clamp(18px, 1.6vw, 22px);
  color: var(--c-ink-soft);
  max-width: 660px;
  margin-bottom: 60px;
  line-height: 1.5;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 720px;
  padding-top: 40px;
  border-top: 1px solid var(--c-rule);
}
.meta-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.meta-num {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 44px);
  color: var(--c-ink);
  letter-spacing: -0.02em;
  line-height: 1;
}
.meta-label {
  font-size: 13px;
  color: var(--c-ink-faint);
  font-weight: 500;
  letter-spacing: 0.02em;
}
@media (max-width: 640px) {
  .hero-meta { grid-template-columns: 1fr; gap: 20px; }
}

/* sections */
.section {
  padding: clamp(80px, 12vw, 140px) var(--gut);
  max-width: var(--max);
  margin: 0 auto;
}
.section-dark {
  background: var(--c-bg-dark);
  color: var(--c-light-on-dark);
  max-width: none;
  margin: 0;
}
.section-dark > * {
  max-width: var(--max);
  margin-left: auto;
  margin-right: auto;
}
.section-head {
  max-width: 720px;
  margin-bottom: clamp(50px, 7vw, 80px);
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 20px;
}
.eyebrow-light { color: var(--c-accent); }

.section h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.0;
  letter-spacing: -0.025em;
  margin-bottom: 20px;
}
.h2-light { color: var(--c-light-on-dark); }
.section-lede-light {
  color: var(--c-soft-on-dark);
  font-size: 18px;
  max-width: 580px;
}

/* how grid */
.how-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.how-card {
  border: 1px solid var(--c-rule-strong);
  border-radius: 14px;
  padding: 36px 32px;
  background: var(--c-bg);
  transition: border-color 0.2s, transform 0.2s;
  position: relative;
}
.how-card:hover {
  border-color: var(--c-accent);
  transform: translateY(-2px);
}
.how-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-accent);
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-bottom: 24px;
}
.how-card h3 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 400;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}
.how-card p {
  color: var(--c-ink-soft);
  font-size: 16px;
  margin-bottom: 12px;
}
.how-card .how-detail {
  color: var(--c-ink-faint);
  font-size: 14px;
  font-style: italic;
  margin-bottom: 0;
}
@media (max-width: 880px) { .how-grid { grid-template-columns: 1fr; } }

/* stack rows */
.stack-grid {
  display: flex;
  flex-direction: column;
  border-top: 1px solid rgba(246, 245, 241, 0.12);
}
.stack-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 26px 0;
  border-bottom: 1px solid rgba(246, 245, 241, 0.12);
  transition: padding 0.2s;
}
.stack-row:hover { padding-left: 12px; padding-right: 12px; background: rgba(246,245,241,0.03); }
.stack-label {
  font-size: 17px;
  color: var(--c-light-on-dark);
  font-weight: 500;
}
.stack-tech {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-soft-on-dark);
  letter-spacing: 0.02em;
}
@media (max-width: 600px) {
  .stack-row { flex-direction: column; align-items: flex-start; gap: 4px; padding: 20px 0; }
}

/* example cards */
.example-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.example-card {
  display: block;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--c-rule-strong);
  border-radius: 16px;
  overflow: hidden;
  background: var(--c-bg);
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.example-card:hover {
  transform: translateY(-3px);
  border-color: var(--c-accent);
  box-shadow: 0 12px 40px rgba(255, 91, 31, 0.1);
}
.example-thumb {
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
  font-size: 80px;
}
.example-bagels {
  background: linear-gradient(135deg, #faf6ef 0%, #f1ead9 100%);
}
.example-soon {
  background: repeating-linear-gradient(
    45deg,
    var(--c-bg-dark),
    var(--c-bg-dark) 12px,
    #1a1815 12px,
    #1a1815 24px
  );
  color: var(--c-faint-on-dark);
}
.example-body { padding: 28px 30px 32px; }
.example-card h3 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 400;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
.example-card p {
  color: var(--c-ink-soft);
  font-size: 15px;
  margin-bottom: 18px;
  line-height: 1.5;
}
.example-link {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-accent);
  font-weight: 500;
}
.example-card-soon { cursor: default; }
.example-card-soon:hover { transform: none; border-color: var(--c-rule-strong); box-shadow: none; }
@media (max-width: 720px) { .example-grid { grid-template-columns: 1fr; } }

/* cta */
.cta-section {
  background: var(--c-bg-dark);
  color: var(--c-light-on-dark);
  padding: clamp(80px, 12vw, 140px) var(--gut);
  text-align: center;
}
.cta-section h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(40px, 6vw, 72px);
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin-bottom: 20px;
  color: var(--c-light-on-dark);
}
.cta-section p {
  color: var(--c-soft-on-dark);
  font-size: 19px;
  max-width: 620px;
  margin: 0 auto 40px;
}
.cta-row {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  padding: 16px 30px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  transition: background 0.15s, color 0.15s, transform 0.15s, border-color 0.15s;
}
.btn-primary {
  background: var(--c-accent);
  color: white;
}
.btn-primary:hover {
  background: #ff7244;
  transform: translateY(-1px);
}
.btn-ghost {
  color: var(--c-light-on-dark);
  border: 1.5px solid rgba(246,245,241,0.25);
}
.btn-ghost:hover {
  border-color: var(--c-light-on-dark);
}

/* footer */
.footer {
  background: var(--c-bg);
  padding: 32px var(--gut);
  border-top: 1px solid var(--c-rule);
}
.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 14px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--c-ink);
}
.footer-meta {
  display: flex;
  gap: 10px;
  color: var(--c-ink-faint);
  font-size: 13px;
}