:root {
  color-scheme: dark;
  --ink: #f6fbff;
  --muted: #9ba7b8;
  --panel: rgba(16, 24, 39, 0.78);
  --line: rgba(255, 255, 255, 0.12);
  --cyan: #39d9ff;
  --mint: #28efc5;
  --pink: #e657ff;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  font-family: Inter, ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 10%, rgba(57, 217, 255, 0.14), transparent 28rem),
    radial-gradient(circle at 88% 5%, rgba(230, 87, 255, 0.12), transparent 25rem),
    linear-gradient(160deg, #070a11 0%, #0b101b 45%, #05070c 100%);
  line-height: 1.6;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  opacity: 0.16;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, black, transparent 75%);
}

a { color: var(--cyan); text-underline-offset: 0.2em; }
a:hover { color: var(--mint); }

.skip-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 10;
  padding: 0.65rem 0.9rem;
  color: #061018;
  background: var(--mint);
  border-radius: 0.7rem;
  transform: translateY(-200%);
}

.skip-link:focus { transform: translateY(0); }

.site-header,
.site-footer,
.shell {
  width: min(1120px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 1.25rem;
}

.brand {
  color: var(--ink);
  font-weight: 900;
  letter-spacing: 0.12em;
  text-decoration: none;
}

.site-nav { display: flex; flex-wrap: wrap; gap: 1rem; }
.site-nav a { color: var(--muted); font-size: 0.92rem; text-decoration: none; }
.site-nav a[aria-current="page"], .site-nav a:hover { color: var(--ink); }

.shell { padding-block: clamp(3rem, 8vw, 7rem); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(18rem, 0.75fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 6rem);
  min-height: 66vh;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--mint);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.08; letter-spacing: -0.025em; }
h1 { margin: 0; font-size: clamp(3.2rem, 10vw, 7.4rem); }
h2 { margin-top: 0; font-size: clamp(2rem, 5vw, 3.6rem); }
h3 { font-size: 1.25rem; }

.gradient-text {
  color: transparent;
  background: linear-gradient(100deg, var(--cyan), var(--mint) 45%, var(--pink));
  background-clip: text;
}

.lede { max-width: 42rem; color: #c3cbd8; font-size: clamp(1.05rem, 2vw, 1.3rem); }

.actions { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 1.7rem; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.75rem 1.05rem;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.06);
  font-weight: 800;
  text-decoration: none;
}
.button.primary { color: #031014; background: linear-gradient(100deg, var(--cyan), var(--mint)); border-color: transparent; }

.gem-mark {
  position: relative;
  width: min(62vw, 22rem);
  aspect-ratio: 1;
  margin: auto;
  filter: drop-shadow(0 0 3rem rgba(57, 217, 255, 0.24));
}
.gem-mark span {
  position: absolute;
  width: 40%;
  aspect-ratio: 1;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 24%;
  background: linear-gradient(145deg, rgba(255,255,255,0.9), var(--cyan) 40%, #087ce0 72%, var(--pink));
  box-shadow: inset 0 0 1.5rem rgba(255,255,255,0.35), 0 1.2rem 2rem rgba(0,0,0,0.35);
  transform: rotate(45deg);
}
.gem-mark span:nth-child(1) { left: 8%; top: 48%; }
.gem-mark span:nth-child(2) { left: 33%; top: 23%; }
.gem-mark span:nth-child(3) { right: 2%; top: 0; }

.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.card, .content-card {
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}
.card { padding: 1.4rem; }
.card p, .content-card p, .content-card li { color: #b8c1cf; }

.content-card { max-width: 52rem; padding: clamp(1.4rem, 4vw, 3rem); }
.content-card h2 { margin-top: 2.5rem; font-size: 1.7rem; }
.content-card h2:first-child { margin-top: 0; }
.content-card hr { margin-block: 2rem; border: 0; border-top: 1px solid var(--line); }

.notice { padding: 1rem 1.1rem; border-left: 3px solid var(--mint); background: rgba(40,239,197,0.07); }

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 2rem 3rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.88rem;
}

@media (max-width: 760px) {
  .site-header, .site-footer { align-items: flex-start; flex-direction: column; }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .gem-mark { grid-row: 1; width: min(68vw, 17rem); }
  .card-grid { grid-template-columns: 1fr; }
  .shell { padding-block: 2.5rem 4rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}