:root {
  --ink: #e6edf7;
  --ink-muted: #b8c2d4;
  --bg: #05060b;
  --bg-soft: #0b0d14;
  --accent: #ff3b3b;
  --accent-alt: #ff8a35;
  --font: "Space Grotesk", "Segoe UI", system-ui, -apple-system, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  letter-spacing: 0.02em;
  background: radial-gradient(circle at 20% 20%, rgba(255, 86, 52, 0.12), transparent 30%),
    radial-gradient(circle at 80% 0%, rgba(255, 189, 89, 0.14), transparent 28%),
    var(--bg);
  color: var(--ink);
  scroll-behavior: smooth;
}

.nav {
  width: 100%;
  padding: 16px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(180deg, #0b0b0d 0%, #050505 100%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  font-size: clamp(1.2rem, 1.4vw + 1rem, 2rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #f7f8fb;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0;
}

.nav-list {
  list-style: none;
  display: flex;
  gap: clamp(14px, 2vw, 24px);
  margin: 0;
  padding: 0;
}

.nav-link {
  position: relative;
  color: #f5f7fb;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 6px 4px;
  display: inline-flex;
  align-items: center;
  text-transform: uppercase;
  transition: color 160ms ease-in-out;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -6px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-alt));
  transform: translateX(-50%) scaleX(0);
  transform-origin: center;
  transition: transform 180ms ease-in-out;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: #ffffff;
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
  transform: translateX(-50%) scaleX(1);
}

main {
  display: flex;
  flex-direction: column;
}

.hero {
  min-height: calc(100vh - 80px);
  padding: clamp(96px, 12vh, 140px) 28px;
  display: grid;
  place-items: center;
  text-align: center;
  background: linear-gradient(140deg, rgba(255, 59, 59, 0.08), transparent 38%),
    linear-gradient(220deg, rgba(255, 138, 53, 0.08), transparent 42%),
    var(--bg-soft);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.hero-mark {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-direction: column;
}

.hero-title {
  font-size: clamp(2.8rem, 6vw, 4.6rem);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  margin: 0;
  position: relative;
  padding: 12px 18px;
  color: #fefefe;
}

.hero-title::before,
.hero-title::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 84%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), var(--accent-alt), transparent);
  transform: translateX(-50%);
  filter: drop-shadow(0 0 12px rgba(255, 59, 59, 0.35));
}

.hero-title::before {
  top: -12px;
}

.hero-title::after {
  bottom: -12px;
}

.hero-line {
  display: block;
  width: 140px;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.22), transparent);
  border-radius: 999px;
}

.hero-line--top {
  box-shadow: 0 -6px 30px rgba(255, 59, 59, 0.18);
}

.hero-line--bottom {
  box-shadow: 0 6px 30px rgba(255, 138, 53, 0.22);
}

.hero-subtitle {
  margin-top: 24px;
  color: var(--ink-muted);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 600;
}

.hero-badge {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.hero-logo-link {
  display: inline-flex;
}

.hero-logo-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 6px;
  border-radius: 12px;
}

.hero-logo {
  max-width: 260px;
  width: 60vw;
  filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.35));
}

.hero-nav {
  margin-top: 48px;
  display: inline-flex;
  gap: 18px;
  padding: 12px 18px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(6px);
}

.hero-link {
  position: relative;
  color: #f5f7fb;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 6px 2px;
  transition: color 160ms ease-in-out;
}

.hero-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -6px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-alt));
  transform: translateX(-50%) scaleX(0);
  transform-origin: center;
  transition: transform 180ms ease-in-out;
}

.hero-link:hover,
.hero-link:focus-visible {
  color: #ffffff;
}

.hero-link:hover::after,
.hero-link:focus-visible::after {
  transform: translateX(-50%) scaleX(1);
}

.section {
  min-height: 100vh;
  padding: clamp(96px, 12vh, 140px) 28px 96px;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  text-align: center;
  color: #f8fbff;
  position: relative;
  overflow: hidden;
}

.section h1,
.section h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  position: relative;
}

.section h1::after,
.section h2::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -14px;
  transform: translateX(-50%);
  width: 90px;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
}

.section--aurora {
  background:
    linear-gradient(140deg, rgba(64, 149, 255, 0.12), transparent 38%),
    linear-gradient(220deg, rgba(92, 212, 255, 0.1), transparent 42%),
    var(--bg-soft);
}

.section--pulse {
  background:
    linear-gradient(140deg, rgba(255, 84, 140, 0.12), transparent 38%),
    linear-gradient(220deg, rgba(204, 124, 255, 0.1), transparent 42%),
    var(--bg-soft);
}

.section--track {
  background:
    linear-gradient(140deg, rgba(255, 78, 64, 0.12), transparent 38%),
    linear-gradient(220deg, rgba(255, 156, 84, 0.1), transparent 42%),
    var(--bg-soft);
}

.section--sunrise {
  background:
    linear-gradient(140deg, rgba(255, 189, 64, 0.12), transparent 38%),
    linear-gradient(220deg, rgba(255, 228, 138, 0.1), transparent 42%),
    var(--bg-soft);
}

@media (max-width: 720px) {
  .nav {
    padding: 14px 18px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .nav nav {
    width: 100%;
  }

  .nav-list {
    gap: 12px;
    width: 100%;
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero-title {
    letter-spacing: 0.12em;
    line-height: 1.1;
  }

  .hero {
    padding: 80px 18px 96px;
  }

  .hero-mark {
    gap: 12px;
  }

  .hero-nav {
    flex-wrap: wrap;
    justify-content: center;
    width: min(520px, 100%);
    gap: 12px;
  }

  .hero-link {
    letter-spacing: 0.1em;
    padding: 12px 10px;
  }

  .section {
    min-height: 50vh;
    padding: 72px 18px 80px;
  }

  .section h1,
  .section h2 {
    letter-spacing: 0.1em;
  }
}

@media (max-width: 480px) {
  .nav-link {
    padding: 12px 10px;
  }

  .hero-title {
    font-size: clamp(2.2rem, 8vw, 3.2rem);
    letter-spacing: 0.08em;
  }
}