:root {
  --ink: #eef9ff;
  --ink-strong: #ffffff;
  --muted: #a9c6d4;
  --blue-950: #020713;
  --blue-900: #04112c;
  --blue-850: #06183f;
  --cyan: #42eaff;
  --cyan-soft: #9af7ff;
  --lime: #c8ff66;
  --line: rgba(104, 230, 255, 0.22);
  --panel: rgba(3, 14, 36, 0.84);
  --max: 1160px;
  --radius: 8px;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.42);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--blue-950);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(120deg, rgba(2, 7, 19, 0.96), rgba(2, 7, 19, 0.5) 44%, rgba(2, 7, 19, 0.88)),
    url("assets/yottasen-bg.webp");
  background-position: center right;
  background-size: cover;
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(2, 7, 19, 0.1), rgba(2, 7, 19, 0.94) 78%, #020713),
    linear-gradient(90deg, rgba(66, 234, 255, 0.1), transparent 34%);
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.shell { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 50;
  transform: translateY(-140%);
  padding: 10px 14px;
  color: #02111d;
  background: var(--cyan);
  border-radius: var(--radius);
  font-weight: 800;
}
.skip-link:focus { transform: translateY(0); }
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 0 14px;
}
.topbar::before {
  content: "";
  position: fixed;
  inset: 0 0 auto;
  z-index: -1;
  height: 88px;
  background: linear-gradient(180deg, rgba(2, 7, 19, 0.94), rgba(2, 7, 19, 0.68), transparent);
  backdrop-filter: blur(12px);
  pointer-events: none;
}
.brand img {
  width: clamp(116px, 11vw, 152px);
  height: auto;
  filter: drop-shadow(0 0 14px rgba(66, 234, 255, 0.12));
}
.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}
.nav a:hover { color: var(--cyan); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 50px;
  padding: 0 22px;
  border: 1px solid var(--cyan);
  border-radius: var(--radius);
  color: var(--cyan-soft);
  background: rgba(4, 20, 55, 0.68);
  box-shadow: 0 0 0 1px rgba(66, 234, 255, 0.1), 0 0 26px rgba(66, 234, 255, 0.12);
  font-weight: 850;
}
.btn:hover { background: rgba(66, 234, 255, 0.1); }
.btn-ghost { border-color: rgba(255,255,255,.22); color: var(--ink); background: rgba(255,255,255,.05); box-shadow: none; }
.hero {
  min-height: 760px;
  display: flex;
  align-items: center;
  padding: 64px 0 88px;
}
.eyebrow, .section-kicker {
  margin: 0 0 12px;
  color: var(--cyan);
  font-size: 14px;
  font-weight: 850;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.hero h1 {
  max-width: 880px;
  margin: 0;
  color: var(--ink-strong);
  font-size: clamp(52px, 8vw, 108px);
  font-weight: 900;
  letter-spacing: 0;
  line-height: .95;
}
.hero h1 strong { color: var(--cyan); }
.accent { display: flex; align-items: center; gap: 14px; margin: 36px 0 28px; }
.accent span { display: block; width: 112px; height: 3px; background: var(--cyan); box-shadow: 0 0 16px rgba(66,234,255,.8); }
.accent i { display: block; width: 4px; height: 4px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 16px rgba(66,234,255,.8); }
.lead {
  max-width: 760px;
  margin: 0 0 30px;
  color: var(--ink);
  font-size: clamp(19px, 1.8vw, 25px);
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.band { padding: 82px 0; border-top: 1px solid rgba(66,234,255,.14); }
.band-tight { padding-top: 48px; }
.section-head {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: start;
  margin-bottom: 34px;
}
.section-head h2 {
  margin: 0;
  color: var(--ink-strong);
  font-size: clamp(32px, 4vw, 54px);
  line-height: 1.04;
}
.section-head p, .body-copy p, .legal-page p, .legal-page li { color: #d9eef7; font-size: 17px; }
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  overflow: hidden;
}
.tile {
  min-height: 210px;
  padding: 24px;
  background: var(--panel);
}
.tile span { color: var(--lime); font-weight: 900; }
.tile h3 { margin: 18px 0 10px; color: var(--ink-strong); font-size: 23px; line-height: 1.15; }
.tile p { margin: 0; color: var(--muted); }
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  overflow: hidden;
}
.panel {
  padding: clamp(24px, 4vw, 44px);
  background: linear-gradient(135deg, rgba(66,234,255,.08), transparent 42%), rgba(3, 14, 36, .86);
}
.panel h3 { margin: 0 0 14px; color: var(--ink-strong); font-size: clamp(24px, 2.4vw, 34px); line-height: 1.1; }
.panel p { margin: 0 0 16px; color: #d9eef7; }
.contact-card {
  border: 1px solid rgba(66,234,255,.24);
  border-radius: var(--radius);
  padding: clamp(26px, 5vw, 52px);
  background: linear-gradient(180deg, rgba(3,14,36,.94), rgba(4,18,45,.86));
  box-shadow: var(--shadow);
}
.contact-card h2 { margin: 0 0 14px; font-size: clamp(30px, 4vw, 52px); line-height: 1.05; }
.contact-card p { max-width: 780px; color: #d9eef7; }
.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 34px 0 52px;
  color: var(--muted);
  border-top: 1px solid rgba(66,234,255,.16);
}
.footer img { width: 150px; height: auto; margin-bottom: 10px; }
.footer p { margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 14px; justify-content: flex-end; }
.footer a { color: var(--cyan); font-weight: 800; }
.legal-page {
  max-width: 980px;
  margin: 0 auto;
  padding: 56px 0 90px;
}
.legal-page h1 { margin: 0 0 30px; font-size: clamp(40px, 6vw, 72px); line-height: 1; }
.legal-page h2 { margin: 34px 0 12px; color: var(--ink-strong); font-size: 27px; }
.legal-page h3 { margin: 22px 0 10px; color: var(--cyan); font-size: 20px; }
.legal-page address { font-style: normal; color: #d9eef7; }
.legal-card {
  border: 1px solid rgba(66,234,255,.24);
  border-radius: var(--radius);
  padding: clamp(22px, 4vw, 44px);
  background: rgba(3,14,36,.88);
}
@media (max-width: 900px) {
  .section-head, .split, .grid-3 { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding-top: 54px; }
}
@media (max-width: 660px) {
  .shell { width: min(100% - 28px, var(--max)); }
  .topbar { align-items: flex-start; gap: 12px; }
  .nav { flex-direction: column; align-items: flex-end; gap: 8px; }
  .brand img { width: 112px; }
  .hero h1 { font-size: 48px; }
  .btn { width: 100%; }
  .nav .btn { width: auto; min-height: 40px; padding-inline: 16px; }
  .footer { flex-direction: column; align-items: flex-start; }
  .footer-links { justify-content: flex-start; }
}