:root {
  color-scheme: dark;
  --bg: #020305;
  --panel: rgba(10, 16, 28, 0.9);
  --line: rgba(255, 255, 255, 0.14);
  --text: #edf4ff;
  --muted: #a5b3c8;
  --cyan: #00f3ff;
  --magenta: #ff4b9e;
  --warning: #ffe29a;
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 10%, rgba(0, 243, 255, 0.11), transparent 32rem),
    radial-gradient(circle at 85% 15%, rgba(255, 0, 122, 0.09), transparent 28rem),
    #020305;
  color: var(--text);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

header,
main,
footer {
  width: min(880px, calc(100% - 2rem));
  margin-inline: auto;
}

header { padding: 2rem 0 1rem; }

.back {
  color: var(--cyan);
  text-decoration: none;
  font-weight: 700;
}

.back:hover,
.back:focus-visible { text-decoration: underline; }

main {
  margin-bottom: 2rem;
  padding: clamp(1.25rem, 4vw, 3rem);
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--panel);
  box-shadow: 0 20px 70px rgba(0, 0, 0, 0.45);
}

h1,
h2 { line-height: 1.2; }

h1 { margin-top: 0; font-size: clamp(2rem, 6vw, 3.5rem); }
h2 { margin-top: 2rem; color: #fff; }
a { color: var(--cyan); }

.eyebrow {
  color: var(--magenta);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.placeholder,
.notice {
  display: block;
  margin: 1rem 0;
  padding: 1rem;
  border: 1px solid rgba(255, 226, 154, 0.45);
  border-radius: 12px;
  background: rgba(255, 226, 154, 0.09);
  color: var(--warning);
}

.placeholder { font-weight: 700; }
.muted { color: var(--muted); }
ul { padding-left: 1.3rem; }
address span { display: block; }

footer {
  padding: 0 0 2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 4px;
}