/* ============ AiD Design — base system ============
   Duality: warm = human (ember/amber) · cool = machine (periwinkle/ice)
   Base stays black & white; hues appear only as atmosphere and accents. */

:root {
  --ink: #0d0c0b;
  --ink-soft: #55524e;
  --paper: #ffffff;
  --paper-warm: #faf8f5;
  --line: #e9e6e1;
  --warm: #c05b2e;
  --warm-soft: #e8a87c;
  --cool: #6d7cbe;
  --cool-soft: #aab8e8;
  --radius-l: 28px;
  --radius-m: 18px;
  --font-display: "Bricolage Grotesque", "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --pad-x: clamp(20px, 6vw, 96px);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--cool-soft); color: var(--ink); }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.02em;
}
:focus-visible { outline: 2px solid var(--cool); outline-offset: 3px; border-radius: 4px; }

.eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 14px;
}
.eyebrow-center { text-align: center; }
.eyebrow-light { color: rgba(255,255,255,0.65); }
.section-title {
  font-size: clamp(34px, 4.6vw, 58px);
  margin-bottom: clamp(28px, 4vw, 56px);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border-radius: 999px;
  padding: 14px 28px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.25s cubic-bezier(.22,.68,0,1.1), background 0.25s, color 0.25s, border-color 0.25s;
}
.btn-ink { background: var(--ink); color: var(--paper); }
.btn-ink:hover { transform: translateY(-2px); background: #000; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { transform: translateY(-2px); border-color: var(--ink); }
.btn-big { padding: 18px 40px; font-size: 17px; }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px var(--pad-x);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-logo { color: var(--ink); }
.nav-links { display: flex; gap: 28px; font-size: 15px; font-weight: 500; }
.nav-links a { position: relative; padding: 6px 0; color: var(--ink-soft); transition: color 0.2s; }
.nav-links a:hover { color: var(--ink); }
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: 0; height: 2px;
  background: linear-gradient(90deg, var(--warm-soft), var(--cool-soft));
  transition: right 0.3s cubic-bezier(.22,.68,0,1);
}
.nav-links a:hover::after { right: 0; }
.nav-cta { padding: 11px 22px; }

/* ---------- Hero lockup: small mark, typed thesis ---------- */
.hero-brand { display: flex; justify-content: center; color: var(--ink); margin-bottom: clamp(22px, 3.5vw, 40px); }
.hero-headline {
  font-size: clamp(34px, 5.4vw, 76px);
  font-weight: 550;
  letter-spacing: -0.028em;
  line-height: 1.06;
  margin: 0 auto;
  min-height: 2.12em; /* reserve both lines so typing doesn't reflow the page */
}
.type-caret {
  display: inline-block;
  width: 0.09em;
  height: 0.92em;
  margin-left: 0.06em;
  background: var(--warm);
  vertical-align: -0.08em;
  animation: caret-blink 1.05s steps(1) infinite;
}
@keyframes caret-blink { 50% { opacity: 0; } }

/* ---------- Cursor particle field ---------- */
#cursor-aura {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 90;
  pointer-events: none;
}
@media (hover: none), (prefers-reduced-motion: reduce) {
  #cursor-aura { display: none; }
}

/* ---------- Footer ---------- */
.footer { padding: clamp(56px, 8vw, 110px) var(--pad-x) 32px; border-top: 1px solid var(--scroll-line, var(--line)); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 40px;
  margin-bottom: clamp(48px, 7vw, 90px);
}
.footer-tag { font-family: var(--font-display); font-size: clamp(20px, 2.4vw, 30px); font-weight: 500; line-height: 1.25; }
.footer-col { display: flex; flex-direction: column; gap: 10px; font-size: 15px; color: var(--ink-soft); }
.footer-col h4 { font-family: var(--font-body); font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink); margin-bottom: 4px; }
.footer-col a:hover { color: var(--ink); }
.footer-word {
  font-family: var(--font-display);
  font-weight: 550;
  font-size: clamp(64px, 13.5vw, 220px);
  letter-spacing: -0.045em;
  line-height: 0.9;
  white-space: nowrap;
  text-align: center;
  background: linear-gradient(100deg, var(--ink) 55%, #3c3a37 78%, var(--ink));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: clamp(40px, 6vw, 80px);
}
.footer-ack {
  border-top: 1px solid var(--line);
  padding-top: 28px;
  font-size: 13.5px;
  color: var(--ink-soft);
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}
.footer-copy { margin-top: 16px; }

@media (max-width: 760px) {
  .nav-links { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-tag { max-width: 320px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}