:root {
  color-scheme: dark;
  --ink: #f5f1df;
  --muted: #b9c2be;
  --panel: rgba(17, 33, 35, 0.88);
  --line: rgba(135, 230, 215, 0.24);
  --cyan: #7cebdc;
  --gold: #f3c969;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 50% -10%, rgba(31, 133, 125, 0.45), transparent 36rem),
    linear-gradient(180deg, #102a2b 0%, #071415 52%, #050b0d 100%);
  font: 17px/1.65 ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.13;
  background-image:
    linear-gradient(30deg, var(--cyan) 12%, transparent 12.5%, transparent 87%, var(--cyan) 87.5%),
    linear-gradient(150deg, var(--cyan) 12%, transparent 12.5%, transparent 87%, var(--cyan) 87.5%);
  background-size: 54px 94px;
}

.shell {
  position: relative;
  width: min(760px, calc(100% - 32px));
  margin: 48px auto 24px;
  padding: clamp(28px, 6vw, 58px);
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--panel);
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.38);
  backdrop-filter: blur(18px);
}

.hero {
  min-height: min(720px, calc(100vh - 120px));
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  align-items: center;
}

.mark {
  display: grid;
  place-items: center;
  width: 96px;
  height: 96px;
  margin-bottom: 22px;
  border: 1px solid rgba(243, 201, 105, 0.52);
  border-radius: 26px;
  color: var(--gold);
  background: linear-gradient(145deg, rgba(243, 201, 105, 0.17), rgba(124, 235, 220, 0.08));
  font-size: 58px;
  box-shadow: inset 0 0 28px rgba(243, 201, 105, 0.12);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--cyan);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1, h2 { line-height: 1.12; letter-spacing: -0.025em; }
h1 { margin: 0 0 20px; font-size: clamp(2.45rem, 8vw, 4.6rem); }
h2 { margin: 0 0 12px; color: var(--gold); font-size: 1.3rem; }
.lede { margin: 0 0 34px; color: var(--muted); font-size: 1.14rem; }

section {
  margin: 26px 0;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

p, ul { margin-top: 0; }
li + li { margin-top: 8px; }
a { color: var(--cyan); }

nav { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.button {
  min-width: 132px;
  padding: 12px 22px;
  border-radius: 999px;
  color: #041313;
  background: var(--cyan);
  text-decoration: none;
  font-weight: 800;
}
.button.secondary { color: var(--ink); background: rgba(255, 255, 255, 0.09); border: 1px solid var(--line); }
.back { display: inline-block; margin-bottom: 34px; text-decoration: none; font-weight: 700; }
.updated { margin: 34px 0 0; color: var(--muted); font-size: 0.88rem; }

footer {
  position: relative;
  padding: 20px 16px 40px;
  color: var(--muted);
  text-align: center;
  font-size: 0.86rem;
}

@media (max-width: 520px) {
  .shell { margin-top: 16px; border-radius: 22px; }
  .hero { min-height: calc(100vh - 72px); }
}