:root {
  --bg: #0a0a0c;
  --bg-alt: #111114;
  --text: #f4f4f2;
  --text-dim: #9a9a9f;
  --accent: #e8e8e6;
  --line: rgba(244,244,242,0.12);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  overflow-x: hidden;
}

/* NAV */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 48px;
  z-index: 100;
  mix-blend-mode: difference;
}
.nav-logo {
  font-weight: 800;
  letter-spacing: 0.15em;
  font-size: 18px;
}
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a {
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.03em;
}
.nav-cta {
  border: 1px solid var(--text);
  padding: 8px 18px;
  border-radius: 999px;
}

/* HERO */
.hero {
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
}
.hero-title {
  font-size: clamp(72px, 16vw, 220px);
  font-weight: 900;
  letter-spacing: 0.02em;
}
.hero-tagline {
  color: var(--text-dim);
  font-size: clamp(14px, 2vw, 20px);
  margin-top: 12px;
  letter-spacing: 0.02em;
}
.scroll-hint {
  position: absolute;
  bottom: 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.scroll-line {
  width: 1px;
  height: 40px;
  background: var(--line);
  overflow: hidden;
}
.scroll-line::after {
  content: '';
  display: block;
  width: 100%;
  height: 40%;
  background: var(--text);
  animation: scrollDown 1.8s ease-in-out infinite;
}
@keyframes scrollDown {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(250%); }
}

/* MISSION */
.mission {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px;
  border-top: 1px solid var(--line);
}
.mission-statement {
  max-width: 780px;
  text-align: center;
  font-size: clamp(24px, 4vw, 42px);
  font-weight: 500;
  line-height: 1.4;
}

/* PRODUCT */
.product {
  padding: 120px 24px;
  border-top: 1px solid var(--line);
}
.product-intro {
  max-width: 600px;
  margin: 0 auto 100px;
  text-align: center;
}
.product-intro h2 {
  font-size: clamp(32px, 5vw, 56px);
  margin-bottom: 16px;
}
.product-intro p { color: var(--text-dim); font-size: 18px; }

.feature {
  display: flex;
  align-items: center;
  gap: 80px;
  max-width: 1100px;
  margin: 0 auto 140px;
}
.feature.reverse { flex-direction: row-reverse; }
.feature-visual {
  flex: 1;
  display: flex;
  justify-content: center;
}
.mask-graphic {
  width: 260px;
  height: 320px;
}
.feature-text { flex: 1; }
.feature-num {
  font-size: 14px;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}
.feature-text h3 {
  font-size: clamp(26px, 3.5vw, 38px);
  margin: 8px 0 16px;
}
.feature-text p {
  color: var(--text-dim);
  font-size: 17px;
  line-height: 1.6;
  max-width: 420px;
}

/* STORY */
.story {
  padding: 140px 24px;
  border-top: 1px solid var(--line);
  text-align: center;
}
.story h2 {
  font-size: clamp(32px, 5vw, 52px);
  margin-bottom: 24px;
}
.story p {
  max-width: 640px;
  margin: 0 auto;
  color: var(--text-dim);
  font-size: 18px;
  line-height: 1.7;
}

/* NOTIFY */
.notify {
  padding: 140px 24px;
  border-top: 1px solid var(--line);
  text-align: center;
  background: var(--bg-alt);
}
.notify h2 { font-size: clamp(28px, 4vw, 44px); margin-bottom: 12px; }
.notify p { color: var(--text-dim); margin-bottom: 32px; }
.notify-form {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
.notify-form input {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 14px 22px;
  color: var(--text);
  font-size: 15px;
  min-width: 280px;
}
.notify-form button {
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: 999px;
  padding: 14px 28px;
  font-weight: 700;
  cursor: pointer;
  font-size: 15px;
}

/* FOOTER */
.footer {
  padding: 60px 24px;
  border-top: 1px solid var(--line);
  text-align: center;
}
.footer-logo {
  font-weight: 800;
  letter-spacing: 0.15em;
  margin-bottom: 8px;
}
.footer p { color: var(--text-dim); font-size: 13px; }

@media (max-width: 780px) {
  .nav { padding: 18px 20px; }
  .nav-links { gap: 16px; }
  .nav-links a:not(.nav-cta) { display: none; }
  .feature, .feature.reverse {
    flex-direction: column;
    gap: 32px;
    text-align: center;
  }
  .feature-text p { margin: 0 auto; }
  .mask-graphic { width: 200px; height: 240px; }
}