/* ===========================================================
   WAiFER — Grid-First AI Infrastructure
   Dark glassmorphism. Restraint over rainbow.
   =========================================================== */

:root {
  --bg:       #07060F;
  --bg-2:     #0F1530;
  --purple:   #3D1F5C;
  --accent:   #7B5FFF;
  --cyan:     #4FA8FF;
  --text:     #EAEAF2;
  --muted:    #9AA0B5;

  --glass:        rgba(255, 255, 255, 0.035);
  --glass-border: rgba(255, 255, 255, 0.09);
  --glass-hi:     rgba(255, 255, 255, 0.06);

  --maxw: 1140px;
  --pad:  clamp(20px, 5vw, 64px);

  --font: "Space Grotesk", ui-sans-serif, system-ui, -apple-system,
          "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

::selection { background: rgba(123, 95, 255, 0.35); color: #fff; }

/* ---------- Decorative background field ---------- */
.bg-field {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 80% at 50% -10%, var(--bg-2) 0%, transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, #050410 100%);
  overflow: hidden;
}

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  will-change: transform;
}
.glow--purple {
  width: 620px; height: 620px;
  top: -180px; left: -120px;
  background: radial-gradient(circle, rgba(123, 95, 255, 0.55), transparent 65%);
  animation: drift-a 26s var(--ease) infinite alternate;
}
.glow--cyan {
  width: 520px; height: 520px;
  top: 120px; right: -140px;
  background: radial-gradient(circle, rgba(79, 168, 255, 0.4), transparent 65%);
  animation: drift-b 32s var(--ease) infinite alternate;
}

@keyframes drift-a {
  to { transform: translate(120px, 90px) scale(1.12); }
}
@keyframes drift-b {
  to { transform: translate(-90px, 60px) scale(1.08); }
}

/* technical line grid */
.grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 30%, transparent 78%);
}

/* subtle grain for depth */
.grain {
  position: absolute;
  inset: -50%;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' /%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' /%3E%3C/svg%3E");
  pointer-events: none;
}

/* ---------- Shared layout ---------- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(70px, 11vw, 130px) var(--pad);
}

.section__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: clamp(28px, 5vw, 52px);
}
.section__index {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: var(--accent);
  font-weight: 600;
  padding-top: 2px;
}
.section__title {
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
  line-height: 1.1;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.32em;
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--muted);
  margin: 0 0 26px;
}

.accent {
  color: #fff;
  background: linear-gradient(110deg, var(--accent), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 600;
}

/* ---------- Buttons ---------- */
.btn {
  --b: 1px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: #fff;
  background: linear-gradient(120deg, var(--accent), #5d7bff);
  border: var(--b) solid rgba(255,255,255,0.18);
  border-radius: 999px;
  padding: 12px 24px;
  cursor: pointer;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), filter 0.3s var(--ease);
  box-shadow: 0 8px 30px rgba(123, 95, 255, 0.28);
}
.btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.08);
  box-shadow: 0 12px 42px rgba(123, 95, 255, 0.45);
}
.btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}
.btn--sm { padding: 9px 18px; font-size: 0.88rem; }
.btn--lg { padding: 15px 32px; font-size: 1.02rem; }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  transition: background 0.4s var(--ease), backdrop-filter 0.4s var(--ease), border-color 0.4s var(--ease);
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(7, 6, 15, 0.72);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--glass-border);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px var(--pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.18rem;
  letter-spacing: 0.04em;
}
.wordmark__mark { flex: none; }
.wordmark__i {
  background: linear-gradient(120deg, var(--accent), var(--cyan));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.6vw, 34px);
}
.nav__links > a:not(.btn) {
  font-size: 0.92rem;
  color: var(--muted);
  transition: color 0.25s var(--ease);
  position: relative;
}
.nav__links > a:not(.btn):hover { color: var(--text); }
.nav__links > a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 0; bottom: -5px;
  width: 0; height: 1px;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  transition: width 0.3s var(--ease);
}
.nav__links > a:not(.btn):hover::after { width: 100%; }

/* ---------- Hero ---------- */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(80px, 16vw, 180px) var(--pad) clamp(60px, 10vw, 110px);
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: clamp(30px, 5vw, 64px);
}
.hero__inner { max-width: 640px; }

.hero__art { display: grid; place-items: center; }
.wafer {
  width: 100%;
  max-width: 380px;
  filter: drop-shadow(0 22px 60px rgba(123, 95, 255, 0.4));
  animation: wafer-float 9s var(--ease) infinite alternate;
  will-change: transform;
}
@keyframes wafer-float {
  from { transform: translateY(-8px) rotate(-1.2deg); }
  to   { transform: translateY(10px) rotate(1.2deg); }
}

.hero__title {
  font-size: clamp(2.9rem, 9vw, 6rem);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: -0.035em;
  margin: 0 0 28px;
  background: linear-gradient(180deg, #fff 0%, #c9c6e8 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero__sub {
  font-size: clamp(1.05rem, 2.2vw, 1.32rem);
  color: var(--muted);
  max-width: 620px;
  margin: 0 0 38px;
  line-height: 1.55;
}

/* ---------- Bottleneck band ---------- */
.band {
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  background: linear-gradient(180deg, rgba(61, 31, 92, 0.18), transparent);
}
.band__text {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(40px, 7vw, 72px) var(--pad);
  font-size: clamp(1.4rem, 3.6vw, 2.4rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--text);
  max-width: 980px;
}

/* ---------- Cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2.2vw, 26px);
}
.card {
  position: relative;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: clamp(26px, 3vw, 38px);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  overflow: hidden;
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease), background 0.4s var(--ease);
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(140deg, rgba(123,95,255,0.5), transparent 40%, transparent 70%, rgba(79,168,255,0.4));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  pointer-events: none;
}
.card:hover {
  transform: translateY(-6px);
  background: var(--glass-hi);
}
.card:hover::before { opacity: 1; }
.card__icon {
  width: 52px; height: 52px;
  color: var(--cyan);
  margin-bottom: 22px;
}
.card__icon svg { width: 100%; height: 100%; }
.card h3 {
  font-size: 1.34rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
}
.card p {
  color: var(--muted);
  font-size: 0.98rem;
  margin: 0;
}

/* ---------- Efficiency / feature ---------- */
.feature__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: clamp(34px, 6vw, 80px);
}
.feature__body {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 480px;
  margin: 6px 0 26px;
}
.feature__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}
.feature__list li {
  position: relative;
  padding-left: 26px;
  color: var(--text);
  font-size: 0.98rem;
}
.feature__list li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.62em;
  width: 9px; height: 9px;
  border-radius: 2px;
  background: linear-gradient(120deg, var(--accent), var(--cyan));
  box-shadow: 0 0 12px rgba(79,168,255,0.6);
}
.feature__art {
  display: grid;
  place-items: center;
}
.loop-art {
  width: 100%;
  max-width: 360px;
  filter: drop-shadow(0 0 40px rgba(79,168,255,0.18));
}
.loop-art__flow {
  stroke-dasharray: 6 10;
  animation: flow 14s linear infinite;
}
@keyframes flow { to { stroke-dashoffset: -320; } }
.loop-art__drop {
  animation: drop 4s var(--ease) infinite;
  filter: drop-shadow(0 0 8px var(--cyan));
}
@keyframes drop {
  0%   { transform: translateY(0); opacity: 1; }
  70%  { transform: translateY(120px); opacity: 0.2; }
  71%  { transform: translateY(0); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}

/* ---------- Audience ---------- */
.audience__row {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 18px;
  font-size: clamp(1.05rem, 2.6vw, 1.5rem);
  font-weight: 500;
  letter-spacing: -0.01em;
}
.audience__row .dot { color: var(--accent); }
.audience__row li:not(.dot) {
  background: linear-gradient(180deg, #fff, #b9b6d8);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---------- Closing ---------- */
.closing {
  border-top: 1px solid var(--glass-border);
  background:
    radial-gradient(80% 140% at 50% 120%, rgba(123,95,255,0.22), transparent 60%);
}
.closing__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(80px, 13vw, 150px) var(--pad);
  text-align: center;
}
.closing__title {
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin: 0 0 36px;
  background: linear-gradient(180deg, #fff, #c9c6e8);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--glass-border);
  background: rgba(5, 4, 14, 0.6);
}
.footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 34px var(--pad);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 22px;
}
.footer__brand { font-weight: 700; letter-spacing: 0.05em; }
.footer__tag { color: var(--muted); font-size: 0.92rem; }
.footer__copy { color: var(--muted); font-size: 0.86rem; margin-left: auto; }

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
/* staggered children inside card grids */
.cards .card:nth-child(2) { transition-delay: 0.08s; }
.cards .card:nth-child(3) { transition-delay: 0.16s; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .feature__grid { grid-template-columns: 1fr; }
  .feature__art { order: -1; }
  .cards { grid-template-columns: 1fr; }
  .hero__grid { grid-template-columns: 1fr; text-align: left; }
  .hero__art { order: -1; justify-items: start; }
  .wafer { max-width: 240px; }
}
@media (max-width: 620px) {
  .nav__links > a:not(.btn) { display: none; }
  .audience__row .dot { display: none; }
  .footer__copy { margin-left: 0; width: 100%; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}