:root {
  --bg: #ffffff;
  --bg-soft: #fafafa;
  --tile: #f4f4f5;
  --tile-ink: #0b0b0c;
  --ink: #0a0a0b;
  --ink-2: #3a3a3d;
  --muted: #86868b;
  --line: #ececed;
  --line-2: #dcdcde;
  --radius: 26px;
  --radius-sm: 16px;
  --max: 1080px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --font: "Inter var", "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection { background: var(--ink); color: #fff; }

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

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  background: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s var(--ease), background 0.4s var(--ease);
}

.nav.scrolled {
  border-bottom-color: var(--line);
  background: rgba(255, 255, 255, 0.85);
}

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 17px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 600;
  font-size: 15.5px;
  letter-spacing: -0.02em;
}

.brand svg { width: 19px; height: 19px; display: block; }

.nav-links { display: flex; gap: 30px; }

.nav-links a {
  position: relative;
  color: var(--muted);
  font-size: 14.5px;
  font-weight: 500;
  padding: 4px 0;
  transition: color 0.25s var(--ease);
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1.5px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}

.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after,
.nav-links a.active::after { transform: scaleX(1); }
.nav-links a.active { color: var(--ink); }

/* ---------- Hero ---------- */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 118px 26px 96px;
  text-align: center;
  position: relative;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  margin-bottom: 34px;
}

.eyebrow .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--ink);
  animation: pulse 2.4s var(--ease) infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.75); }
}

.hero h1 {
  font-size: clamp(38px, 6.4vw, 74px);
  font-weight: 680;
  line-height: 1.02;
  letter-spacing: -0.045em;
}

.hero h1 .line { display: block; overflow: hidden; }
.hero h1 .line span { display: inline-block; will-change: transform; }
.js .hero h1 .line span { transform: translateY(108%); animation: rise 0.95s var(--ease) forwards; }
.js .hero h1 .line:nth-child(1) span { animation-delay: 0.12s; }
.js .hero h1 .line:nth-child(2) span { animation-delay: 0.21s; }
@keyframes rise { to { transform: translateY(0); } }

.hero-sub {
  margin: 30px auto 0;
  max-width: 460px;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.5;
  color: var(--muted);
  font-weight: 400;
}

.hero-cta {
  margin-top: 40px;
  display: flex;
  gap: 14px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 550;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), background 0.3s var(--ease);
}

.btn-primary {
  background: var(--ink);
  color: #fff;
  box-shadow: 0 1px 2px rgba(0,0,0,0.16);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(0,0,0,0.18); }
.btn-primary .arw { transition: transform 0.3s var(--ease); }
.btn-primary:hover .arw { transform: translateX(4px); }

.btn-ghost { color: var(--ink-2); font-weight: 500; }
.btn-ghost:hover { color: var(--ink); }

.scroll-cue {
  margin-top: 74px;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.scroll-cue .rail {
  width: 1px; height: 40px;
  background: linear-gradient(var(--line-2), transparent);
  position: relative; overflow: hidden;
}
.scroll-cue .rail::after {
  content: ""; position: absolute; left: 0; top: 0;
  width: 1px; height: 14px; background: var(--ink);
  animation: fall 2s var(--ease) infinite;
}
@keyframes fall {
  0% { transform: translateY(-14px); opacity: 0; }
  40% { opacity: 1; }
  100% { transform: translateY(40px); opacity: 0; }
}

/* ---------- Section head ---------- */
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 30px 26px 40px;
}
.section-head { text-align: center; margin-bottom: 54px; }
.section-head h2 {
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 660;
  letter-spacing: -0.035em;
  line-height: 1.08;
}
.section-head p {
  margin: 14px auto 0;
  max-width: 400px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.5;
}

/* ---------- Tools grid ---------- */
.tools { position: relative; padding-bottom: 90px; }

.flow-line {
  position: absolute;
  top: 8px; bottom: 60px;
  left: 50%;
  width: 2px;
  transform: translateX(-1px);
  background: linear-gradient(180deg, transparent, var(--line) 8%, var(--line) 92%, transparent);
  overflow: hidden;
  z-index: 0;
  pointer-events: none;
}
.flow-line::after {
  content: "";
  position: absolute; left: 0;
  width: 2px; height: 130px;
  top: -130px;
  background: linear-gradient(180deg, transparent, rgba(10,10,11,0.85), transparent);
  animation: flow 3.6s linear infinite;
}
@keyframes flow {
  0% { top: -130px; }
  100% { top: 100%; }
}

.grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.card {
  position: relative;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 26px 30px;
  min-height: 182px;
  overflow: hidden;
  cursor: default;
  transition:
    opacity 0.7s var(--ease),
    transform 0.7s var(--ease),
    border-color 0.4s var(--ease),
    box-shadow 0.4s var(--ease);
}
/* hidden state applies only when JS confirmed running */
.js .card { opacity: 0; transform: translateY(26px); }
.js .card.in { opacity: 1; transform: translateY(0); }

.card:hover {
  border-color: var(--line-2);
  box-shadow: 0 20px 44px rgba(0,0,0,0.07);
  transform: translateY(-5px);
}

/* app-tile icon */
.tile {
  width: 54px; height: 54px;
  border-radius: var(--radius-sm);
  background: var(--tile);
  display: flex; align-items: center; justify-content: center;
  color: var(--tile-ink);
  transition: background 0.4s var(--ease), color 0.4s var(--ease), transform 0.4s var(--ease);
}
.tile svg { width: 26px; height: 26px; display: block; }
.card:hover .tile { background: var(--ink); color: #fff; transform: scale(1.04); }

.card h3 {
  margin-top: 22px;
  font-size: 18.5px;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.card p {
  margin-top: 9px;
  font-size: 14.5px;
  line-height: 1.52;
  color: var(--muted);
}

.card .idx {
  position: absolute;
  top: 26px; right: 26px;
  font-size: 12px;
  font-weight: 500;
  color: var(--line-2);
  font-variant-numeric: tabular-nums;
  transition: color 0.4s var(--ease);
}
.card:hover .idx { color: var(--muted); }

/* ---------- Ecosystem strip ---------- */
.ecosystem {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 88px 26px;
  text-align: center;
  overflow: hidden;
}
.ecosystem h2 {
  font-size: clamp(26px, 4vw, 44px);
  font-weight: 660;
  letter-spacing: -0.04em;
  line-height: 1.1;
  max-width: 720px;
  margin: 0 auto;
}
.ecosystem h2 em {
  font-style: normal;
  color: var(--muted);
}
.marquee {
  margin-top: 46px;
  display: flex;
  gap: 14px;
  width: max-content;
  animation: scroll-x 32s linear infinite;
}
.marquee:hover { animation-play-state: paused; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 11px 20px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  background: var(--bg);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-2);
  white-space: nowrap;
}
.chip svg { width: 16px; height: 16px; }
@keyframes scroll-x {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
.marquee-mask {
  position: relative;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}

/* ---------- Social ---------- */
.social { padding: 30px 26px 110px; max-width: 760px; margin: 0 auto; }
.social-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.social-card {
  position: relative;
  display: block;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 40px 34px 36px;
  min-height: 230px;
  overflow: hidden;
  transition: transform 0.45s var(--ease), border-color 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.social-card:hover {
  transform: translateY(-6px);
  border-color: var(--line-2);
  box-shadow: 0 24px 50px rgba(0,0,0,0.08);
}
.social-card .tile { width: 58px; height: 58px; border-radius: 18px; }
.social-card .tile svg { width: 30px; height: 30px; }
.social-card:hover .tile { background: var(--ink); color: #fff; }
.social-card h3 { margin-top: 24px; font-size: 22px; font-weight: 640; letter-spacing: -0.02em; }
.social-card p { margin-top: 7px; font-size: 15px; color: var(--muted); }
.social-card .arw-c {
  position: absolute; right: 34px; bottom: 34px;
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid var(--line-2);
  display: flex; align-items: center; justify-content: center;
  color: var(--ink);
  transition: transform 0.4s var(--ease), background 0.4s var(--ease), color 0.4s var(--ease), border-color 0.4s var(--ease);
}
.social-card:hover .arw-c { background: var(--ink); color: #fff; border-color: var(--ink); transform: translateX(4px); }
.social-card .arw-c svg { width: 17px; height: 17px; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 46px 26px 60px;
}
.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.footer .brand { color: var(--ink); }
.footer-tag { font-size: 13.5px; color: var(--muted); }
.footer-links { display: flex; gap: 24px; font-size: 13.5px; color: var(--muted); }
.footer-links a:hover { color: var(--ink); }

/* ---------- Reveal utility ---------- */
.reveal { transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
.js .reveal { opacity: 0; transform: translateY(22px); }
.js .reveal.in { opacity: 1; transform: translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 720px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .flow-line { display: none; }
}
@media (max-width: 480px) {
  .grid, .social-grid { grid-template-columns: 1fr; }
  .hero { padding: 84px 22px 70px; }
  .nav-inner { padding: 15px 20px; }
  .nav-links { gap: 22px; }
  .footer-inner { flex-direction: column; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::after, *::before { animation: none !important; transition-duration: 0.01ms !important; }
  .card, .reveal, .hero h1 .line span { opacity: 1 !important; transform: none !important; }
}