/* RedChain.ai — marketing landing page
   Brand: Signal red #E8291C · Ink #0B0C0E · Paper #F4F2ED · Red-on-ink #FF6A5E
   Type: Space Grotesk (400/500/600/700) · JetBrains Mono (400/500/700) */

:root {
  --ink: #0B0C0E;
  --ink-rgb: 11, 12, 14;
  --paper: #F4F2ED;
  --paper-rgb: 244, 242, 237;
  --accent: #E8291C;
  --accent-rgb: 232, 41, 28;
  --accent-on-ink: #FF6A5E;

  --font-sans: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', monospace;

  --container: 1240px;
  --gutter: 40px;
}

@media (max-width: 720px) {
  :root { --gutter: 20px; }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

.wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px; margin: -1px;
  padding: 0; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  border-radius: 6px;
  font: 500 13.5px/1 var(--font-sans);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color .15s ease, border-color .15s ease, color .15s ease, transform .15s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }

.btn-accent {
  background: var(--accent);
  color: var(--paper);
}
.btn-accent:hover { background: #ff3a29; }

.btn-outline-onink {
  border-color: rgba(var(--paper-rgb), .22);
  color: rgba(var(--paper-rgb), .85);
}
.btn-outline-onink:hover { border-color: rgba(var(--paper-rgb), .45); color: var(--paper); }

.btn-sm {
  padding: 8px 15px;
  font-size: 12px;
  border-radius: 5px;
}

/* ---------- Nav ---------- */
.site-header {
  border-bottom: 1px solid rgba(var(--paper-rgb), .09);
  position: sticky;
  top: 0;
  background: rgba(11, 12, 14, .85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 40;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 68px;
}

.brand { display: flex; align-items: center; gap: 10px; flex: none; }
.brand svg { flex: none; }
.brand-word { font: 700 16px var(--font-sans); color: var(--paper); }
.brand-word span.tail { font-weight: 400; letter-spacing: .03em; }

.nav-links {
  display: flex;
  gap: 24px;
  margin-left: 26px;
  font: 400 12.5px var(--font-sans);
  color: rgba(var(--paper-rgb), .6);
  list-style: none;
  padding: 0;
}
.nav-links a:hover { color: var(--paper); }

.nav-side {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}
.nav-signin {
  font: 400 12.5px var(--font-sans);
  color: rgba(var(--paper-rgb), .6);
}
.nav-signin:hover { color: var(--paper); }

.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 1px solid rgba(var(--paper-rgb), .22);
  border-radius: 6px;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  color: var(--paper);
  cursor: pointer;
}
.nav-toggle svg { pointer-events: none; }

@media (max-width: 880px) {
  .nav-links { display: none; }
  .nav-side { margin-left: auto; }
  .nav-signin { display: none; }
}

@media (max-width: 640px) {
  .nav-toggle { display: inline-flex; order: 3; }
  .nav-side .btn-sm { order: 2; }
  .site-header .wrap { flex-wrap: wrap; height: auto; min-height: 68px; padding-top: 14px; padding-bottom: 14px; }
  .mobile-menu { flex-basis: 100%; }
}

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 2px;
  padding: 6px 0 2px;
}
.mobile-menu a {
  padding: 10px 2px;
  font: 400 13.5px var(--font-sans);
  color: rgba(var(--paper-rgb), .75);
  border-top: 1px solid rgba(var(--paper-rgb), .08);
}
.mobile-menu a:hover { color: var(--paper); }
html.nav-open .mobile-menu { display: flex; }

/* ---------- Hero ---------- */
.hero .wrap {
  display: grid;
  grid-template-columns: 1fr 520px;
  gap: 44px;
  align-items: center;
  padding-top: 64px;
  padding-bottom: 60px;
}

@media (max-width: 980px) {
  .hero .wrap { grid-template-columns: 1fr; padding-top: 48px; padding-bottom: 40px; }
  .hero-art { order: -1; padding: 0 0 12px; }
}

.hero-copy { display: flex; flex-direction: column; gap: 24px; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 5px 11px;
  border: 1px solid rgba(var(--accent-rgb), .4);
  border-radius: 20px;
  align-self: flex-start;
}
.badge-dot {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent);
  animation: rc-pulse 1.6s ease-in-out infinite;
}
.badge-text {
  font: 500 9px var(--font-mono);
  letter-spacing: .13em;
  color: var(--accent-on-ink);
}

.hero h1 {
  margin: 0;
  font: 700 clamp(34px, 6vw, 62px) / 1.05 var(--font-sans);
  letter-spacing: -.035em;
  color: var(--paper);
  text-wrap: pretty;
}
.hero h1 .accent { color: var(--accent); }

.hero-lede {
  margin: 0;
  font: 400 16.5px/1.6 var(--font-sans);
  color: rgba(var(--paper-rgb), .6);
  max-width: 46ch;
  text-wrap: pretty;
}

.hero-ctas { display: flex; gap: 11px; align-items: center; flex-wrap: wrap; }

.trust-row {
  display: flex;
  gap: 26px;
  flex-wrap: wrap;
  padding-top: 6px;
  font: 400 11px var(--font-mono);
  color: rgba(var(--paper-rgb), .38);
}

.hero-art {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px 0;
}
.hero-art svg { width: 100%; height: auto; max-width: 470px; }

/* ---------- Stats ---------- */
.stats {
  border-top: 1px solid rgba(var(--paper-rgb), .09);
  border-bottom: 1px solid rgba(var(--paper-rgb), .09);
}
.stats .wrap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 0;
}
.stat {
  padding: 26px var(--gutter);
  display: flex;
  flex-direction: column;
  gap: 7px;
  border-right: 1px solid rgba(var(--paper-rgb), .09);
}
.stat:last-child { border-right: none; }
.stat-num {
  font: 700 30px/1 var(--font-sans);
  letter-spacing: -.03em;
  color: var(--paper);
}
.stat-num .unit { font-size: 17px; color: rgba(var(--paper-rgb), .45); font-weight: 700; }
.stat-label { font: 400 11.5px var(--font-sans); color: rgba(var(--paper-rgb), .5); }

@media (max-width: 720px) {
  .stats .wrap { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: none; }
  .stat:nth-child(1), .stat:nth-child(2) { border-bottom: 1px solid rgba(var(--paper-rgb), .09); }
}

/* ---------- Section scaffolding ---------- */
.section { padding: 66px 0 60px; }
.section-paper { background: var(--paper); color: var(--ink); }
.section-tint { background: rgba(var(--paper-rgb), .03); border-top: 1px solid rgba(var(--paper-rgb), .09); border-bottom: 1px solid rgba(var(--paper-rgb), .09); }

.eyebrow {
  display: block;
  font: 500 9px var(--font-mono);
  letter-spacing: .2em;
  color: var(--accent);
}

.section-head {
  display: flex;
  align-items: flex-end;
  gap: 40px;
  margin-bottom: 34px;
}
@media (max-width: 780px) {
  .section-head { flex-direction: column; align-items: flex-start; gap: 16px; }
}

.section-head h2 {
  margin: 10px 0 0;
  font: 700 38px/1.1 var(--font-sans);
  letter-spacing: -.028em;
  max-width: 22ch;
  text-wrap: pretty;
}
.section-head p {
  margin: 0;
  font: 400 14px/1.65 var(--font-sans);
  color: rgba(var(--paper-rgb), .55);
  max-width: 38ch;
  flex: none;
  width: 340px;
  text-wrap: pretty;
}
.section-paper .section-head p { color: rgba(var(--ink-rgb), .58); }

/* ---------- How it works ---------- */
.how-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(var(--paper-rgb), .09);
  border: 1px solid rgba(var(--paper-rgb), .09);
}
.how-card {
  padding: 26px 24px 28px;
  background: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 13px;
}
.how-num-row { display: flex; align-items: center; gap: 10px; }
.how-num { font: 500 9px var(--font-mono); color: var(--accent); }
.how-title { font: 600 15px/1.25 var(--font-sans); color: var(--paper); }
.how-desc { font: 400 12.5px/1.6 var(--font-sans); color: rgba(var(--paper-rgb), .5); text-wrap: pretty; }

@media (max-width: 900px) {
  .how-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .how-grid { grid-template-columns: 1fr; }
}

/* ---------- Watch it think ---------- */
.think-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  align-items: center;
}
@media (max-width: 900px) {
  .think-grid { grid-template-columns: 1fr; }
}

.think-copy { display: flex; flex-direction: column; gap: 18px; }
.think-copy h2 {
  margin: 0;
  font: 700 34px/1.12 var(--font-sans);
  letter-spacing: -.028em;
  color: var(--paper);
  max-width: 24ch;
  text-wrap: pretty;
}
.think-copy > p {
  margin: 0;
  font: 400 14px/1.65 var(--font-sans);
  color: rgba(var(--paper-rgb), .55);
  max-width: 44ch;
  text-wrap: pretty;
}

.think-list { display: flex; flex-direction: column; gap: 9px; padding-top: 4px; margin: 0; list-style: none; }
.think-list li {
  display: flex;
  gap: 9px;
  font: 400 12.5px/1.5 var(--font-sans);
  color: rgba(var(--paper-rgb), .65);
}
.think-list li::before { content: '›'; color: var(--accent-on-ink); }

.terminal {
  border: 1px solid rgba(var(--paper-rgb), .12);
  border-radius: 9px;
  overflow: hidden;
  background: #08090A;
}
.terminal-head {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 11px 15px;
  border-bottom: 1px solid rgba(var(--paper-rgb), .08);
}
.terminal-title {
  font: 500 9px var(--font-mono);
  letter-spacing: .16em;
  color: rgba(var(--paper-rgb), .42);
}
.terminal-live {
  margin-left: auto;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  animation: rc-pulse 1.4s ease-in-out infinite;
}
.terminal-body {
  padding: 15px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font: 400 10.5px/1.55 var(--font-mono);
  color: rgba(var(--paper-rgb), .55);
}
.terminal-body .ts { color: rgba(var(--paper-rgb), .3); }
.terminal-body .arrow { color: var(--accent-on-ink); }
.terminal-body .hl { color: var(--paper); }
.terminal-proof {
  padding: 10px 12px;
  border: 1px solid rgba(var(--accent-rgb), .35);
  border-radius: 6px;
  background: rgba(var(--accent-rgb), .07);
  color: rgba(var(--paper-rgb), .8);
}
.terminal-proof .tag { color: var(--accent-on-ink); letter-spacing: .1em; }
.terminal-cursor {
  display: inline-block;
  width: 7px; height: 13px;
  background: var(--accent);
  animation: rc-blink 1s step-end infinite;
  vertical-align: -2px;
}

/* ---------- Audiences ---------- */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
@media (max-width: 900px) {
  .audience-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .audience-grid { grid-template-columns: 1fr; }
}
.audience-card {
  padding: 24px 22px 26px;
  background: rgba(var(--ink-rgb), .04);
  border-radius: 9px;
  display: flex;
  flex-direction: column;
  gap: 11px;
}
.audience-card.is-dark {
  background: var(--ink);
}
.audience-title { font: 600 14.5px var(--font-sans); color: var(--ink); }
.audience-card.is-dark .audience-title { color: var(--paper); }
.audience-desc { font: 400 12.5px/1.6 var(--font-sans); color: rgba(var(--ink-rgb), .58); text-wrap: pretty; }
.audience-card.is-dark .audience-desc { color: rgba(var(--paper-rgb), .6); }

/* ---------- Final CTA ---------- */
.cta-final {
  padding: 70px 0 66px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}
.cta-final h2 {
  margin: 0;
  font: 700 clamp(28px, 5vw, 42px)/1.08 var(--font-sans);
  letter-spacing: -.032em;
  color: var(--paper);
  max-width: 24ch;
  text-wrap: pretty;
}
.cta-final p {
  margin: 0;
  font: 400 15px/1.6 var(--font-sans);
  color: rgba(var(--paper-rgb), .55);
  max-width: 52ch;
  text-wrap: pretty;
}
.cta-final .hero-ctas { padding-top: 6px; justify-content: center; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid rgba(var(--paper-rgb), .09);
}
.site-footer .wrap {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  padding-top: 32px;
  padding-bottom: 32px;
}
.footer-brand { display: flex; align-items: center; gap: 9px; }
.footer-brand .brand-word { font-size: 12.5px; color: rgba(var(--paper-rgb), .8); }
.footer-links {
  display: flex;
  gap: 20px;
  margin-left: 20px;
  font: 400 11px var(--font-mono);
  color: rgba(var(--paper-rgb), .38);
  list-style: none;
  padding: 0;
  flex-wrap: wrap;
}
.footer-links a:hover { color: rgba(var(--paper-rgb), .7); }
.footer-meta {
  margin-left: auto;
  font: 400 11px var(--font-mono);
  color: rgba(var(--paper-rgb), .3);
}

@media (max-width: 680px) {
  .footer-links { margin-left: 0; }
  .footer-meta { margin-left: 0; }
}

/* ---------- Keyframes ---------- */
@keyframes rc-pulse { 0%, 100% { opacity: 1; } 50% { opacity: .3; } }
@keyframes rc-blink { 0%, 49% { opacity: 1; } 50%, 100% { opacity: 0; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .badge-dot, .terminal-live, .terminal-cursor {
    animation: none !important;
    opacity: 1;
  }
  /* SMIL <animate> elements in the hero graphic are frozen by js/main.js,
     since CSS cannot target them. */
}