/* ==========================================================================
   CAD-Flow — design system
   Duotone: blueprint blue (the CAD block) → drafting amber (the rendered asset)
   ========================================================================== */

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

:root {
  /* surfaces — never pure black (OLED smear) */
  --bg:            #0A0D14;
  --bg-2:          #0F1420;
  --surface:       #121826;
  --surface-2:     #182034;
  --line:          rgba(255, 255, 255, .08);
  --line-strong:   rgba(255, 255, 255, .14);

  /* ink */
  --ink:           #E9EEF6;
  --ink-2:         #9FB0C6;
  --ink-3:         #64748B;

  /* brand */
  --blue:          #3B9EFF;
  --blue-deep:     #2563EB;
  --blue-soft:     rgba(59, 158, 255, .12);
  --amber:         #FF9F45;
  --amber-deep:    #F2762B;
  --amber-soft:    rgba(255, 159, 69, .12);

  /* type */
  --sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  /* rhythm — 4/8 scale */
  --s-1: 4px;  --s-2: 8px;  --s-3: 12px; --s-4: 16px;
  --s-5: 24px; --s-6: 32px; --s-7: 48px; --s-8: 64px;
  --s-9: 96px; --s-10: 128px;

  --r-sm: 6px; --r-md: 10px; --r-lg: 16px; --r-xl: 24px;

  --container: 1200px;

  /* motion — one rhythm for the whole site */
  --ease: cubic-bezier(.16, 1, .3, 1);
  --fast: 160ms;
  --mid:  280ms;

  /* z-scale */
  --z-nav: 100;  --z-modal: 1000;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--ink);
  font: 400 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

::selection { background: rgba(59, 158, 255, .28); color: #fff; }

/* --------------------------------------------------------------- primitives */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--s-5);
}

.mono {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* section label — reads like a drawing-sheet annotation */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--blue);
}
.eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--blue));
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -.022em;
  line-height: 1.12;
  text-wrap: balance;
}
h1 { font-size: clamp(38px, 6.2vw, 76px); font-weight: 800; letter-spacing: -.032em; }
h2 { font-size: clamp(30px, 3.8vw, 48px); }
h3 { font-size: clamp(20px, 2vw, 24px); }

p { margin: 0; }
.lede {
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 62ch;
  text-wrap: pretty;
}

.grad-blue {
  background: linear-gradient(120deg, var(--blue) 0%, #8FCBFF 55%, var(--amber) 130%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ------------------------------------------------------------------ buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  min-height: 46px;
  padding: 0 var(--s-5);
  border: 1px solid transparent;
  border-radius: var(--r-md);
  font: 600 15px/1 var(--sans);
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--fast) var(--ease),
              background var(--fast) var(--ease),
              border-color var(--fast) var(--ease),
              box-shadow var(--fast) var(--ease);
}
.btn:active { transform: scale(.975); }

.btn-primary {
  background: linear-gradient(180deg, var(--blue), var(--blue-deep));
  color: #fff;
  box-shadow: 0 8px 28px -10px rgba(37, 99, 235, .85),
              inset 0 1px 0 rgba(255, 255, 255, .22);
}
.btn-primary:hover {
  box-shadow: 0 14px 40px -10px rgba(59, 158, 255, .95),
              inset 0 1px 0 rgba(255, 255, 255, .3);
}

.btn-ghost {
  background: rgba(255, 255, 255, .03);
  border-color: var(--line-strong);
  color: var(--ink);
}
.btn-ghost:hover { background: rgba(255, 255, 255, .07); border-color: var(--blue); }

.btn-lg { min-height: 54px; padding: 0 var(--s-6); font-size: 16px; }

/* --------------------------------------------------------------------- nav */

.nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: var(--z-nav);
  transition: background var(--mid) var(--ease), border-color var(--mid) var(--ease);
  border-bottom: 1px solid transparent;
}
.nav.is-stuck {
  background: rgba(10, 13, 20, .72);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border-bottom-color: var(--line);
}
.nav-in {
  display: flex;
  align-items: center;
  gap: var(--s-6);
  height: 68px;
}

.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand svg { width: 30px; height: 30px; }
.brand-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.02em;
}
.brand-name em { font-style: normal; color: var(--blue); }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--s-1);
  margin-left: auto;
}
.nav-links a {
  position: relative;
  padding: 8px 14px;
  border-radius: var(--r-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-2);
  transition: color var(--fast) var(--ease), background var(--fast) var(--ease);
}
.nav-links a:hover { color: var(--ink); background: rgba(255, 255, 255, .05); }
.nav-links a[aria-current='page'] { color: var(--ink); }
.nav-links a[aria-current='page']::after {
  content: '';
  position: absolute;
  left: 14px; right: 14px; bottom: 2px;
  height: 1.5px;
  background: var(--blue);
  border-radius: 2px;
}

.nav-cta { display: flex; align-items: center; gap: var(--s-3); }

.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  align-items: center; justify-content: center;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  color: var(--ink);
  cursor: pointer;
}

/* ------------------------------------------------------------------ layout */

.section { padding-block: clamp(var(--s-8), 9vw, var(--s-10)); }
.section-head { max-width: 720px; margin-bottom: var(--s-7); }
.section-head h2 { margin-block: var(--s-4) var(--s-4); }

/* hairline rule that reads like a drawing frame */
.rule {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong) 20%, var(--line-strong) 80%, transparent);
}

.grid { display: grid; gap: var(--s-5); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  position: relative;
  padding: var(--s-6);
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: border-color var(--mid) var(--ease), transform var(--mid) var(--ease);
}
.card:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.card h3 { margin-bottom: var(--s-3); }
.card p { color: var(--ink-2); font-size: 15px; }

.card-icon {
  display: grid;
  place-items: center;
  width: 44px; height: 44px;
  margin-bottom: var(--s-5);
  background: var(--blue-soft);
  border: 1px solid rgba(59, 158, 255, .25);
  border-radius: var(--r-md);
  color: var(--blue);
}
.card-icon svg { width: 21px; height: 21px; }

/* ------------------------------------------------------- blueprint backdrop */

.blueprint {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 20%, transparent 78%);
  opacity: .5;
}

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
  opacity: .5;
}

/* -------------------------------------------------------------------- hero */

.hero {
  position: relative;
  padding-top: 140px;
  padding-bottom: var(--s-9);
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.02fr .98fr;
  gap: var(--s-7);
  align-items: center;
}
.hero-copy > * + * { margin-top: var(--s-5); }
.hero h1 { margin-top: var(--s-4); }

.hero-cta { display: flex; flex-wrap: wrap; gap: var(--s-3); padding-top: var(--s-2); }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2) var(--s-5);
  padding-top: var(--s-4);
}
.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .07em;
  color: var(--ink-3);
}
.hero-meta svg { width: 13px; height: 13px; color: var(--blue); flex-shrink: 0; }

/* the 3D stage */
.stage {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background:
    radial-gradient(ellipse at 50% 45%, rgba(59, 158, 255, .08), transparent 65%),
    linear-gradient(180deg, var(--bg-2), var(--bg));
  overflow: hidden;
}
.stage canvas { width: 100%; height: 100%; }

/* corner ticks — drafting frame */
.stage::before, .stage::after {
  content: '';
  position: absolute;
  width: 18px; height: 18px;
  border: 1px solid rgba(59, 158, 255, .5);
  pointer-events: none;
}
.stage::before { top: 16px; left: 16px; border-right: 0; border-bottom: 0; }
.stage::after { bottom: 16px; right: 16px; border-left: 0; border-top: 0; }

.stage-hud {
  position: absolute;
  left: 20px; bottom: 18px;
  display: flex;
  gap: var(--s-4);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .09em;
  color: var(--ink-3);
  pointer-events: none;
}
.stage-hud b { color: var(--blue); font-weight: 500; }

/* the blue→amber state readout, top-right of the stage */
.stage-state {
  position: absolute;
  top: 18px; right: 18px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 5px 10px;
  background: rgba(10, 13, 20, .6);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .09em;
  color: var(--ink-2);
  backdrop-filter: blur(6px);
  pointer-events: none;
}
.stage-state i {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 8px var(--blue);
  transition: background var(--mid) var(--ease), box-shadow var(--mid) var(--ease);
}
.stage-state.is-solid i { background: var(--amber); box-shadow: 0 0 8px var(--amber); }

/* ------------------------------------------------------------------ marquee */

.strip {
  border-block: 1px solid var(--line);
  background: rgba(255, 255, 255, .012);
  padding-block: var(--s-5);
  overflow: hidden;
}
.strip-label {
  text-align: center;
  margin-bottom: var(--s-4);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.marquee { display: flex; overflow: hidden; mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.marquee-track {
  display: flex;
  gap: var(--s-7);
  flex-shrink: 0;
  padding-right: var(--s-7);
  animation: slide 42s linear infinite;
}
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes slide { to { transform: translateX(-100%); } }
.marquee-track span {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  white-space: nowrap;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-3);
}
.marquee-track svg { width: 15px; height: 15px; color: var(--blue); opacity: .7; }

/* -------------------------------------------------------------------- stats */

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; }
.stat { padding: var(--s-6); background: var(--bg-2); text-align: center; }
.stat-n {
  font-family: var(--mono);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  letter-spacing: -.02em;
}
.stat-n em { font-style: normal; color: var(--blue); }
.stat-l { margin-top: var(--s-2); font-size: 13px; color: var(--ink-3); }

/* ------------------------------------------------------------------- footer */

.footer { border-top: 1px solid var(--line); padding-block: var(--s-8) var(--s-6); background: var(--bg-2); }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: var(--s-6); }
.footer-brand p { margin-top: var(--s-4); max-width: 34ch; font-size: 14px; color: var(--ink-3); }
.footer h4 { margin-bottom: var(--s-4); font-size: 13px; font-weight: 600; letter-spacing: .04em; color: var(--ink); }
.footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer ul a { font-size: 14px; color: var(--ink-3); transition: color var(--fast) var(--ease); }
.footer ul a:hover { color: var(--blue); }
.footer-base {
  display: flex; flex-wrap: wrap; gap: var(--s-4);
  align-items: center; justify-content: space-between;
  margin-top: var(--s-8); padding-top: var(--s-5);
  border-top: 1px solid var(--line);
  font-size: 13px; color: var(--ink-3);
}

/* ---------------------------------------------------------- scroll reveal */

/* Hidden ONLY once JS has confirmed it can reveal them again. Without this
   guard a JS failure would leave the whole page invisible. */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 620ms var(--ease), transform 620ms var(--ease);
  transition-delay: var(--d, 0ms);
}
.js [data-reveal].is-in { opacity: 1; transform: none; }

/* --------------------------------------------------------------- responsive */

@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: var(--s-8); }
  .stage { max-width: 520px; margin-inline: auto; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    inset: 68px 0 auto;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--s-4);
    background: rgba(10, 13, 20, .96);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--mid) var(--ease), transform var(--mid) var(--ease), visibility var(--mid);
  }
  .nav-links.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav-links a { padding: 14px; min-height: 48px; display: flex; align-items: center; font-size: 16px; }
  .nav-links a[aria-current='page']::after { display: none; }
  .nav-toggle { display: flex; margin-left: auto; }
  .nav-cta .btn { display: none; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .hero { padding-top: 108px; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
}

/* ------------------------------------------------------------ reduced motion */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
  .marquee-track { animation: none; }
}