:root {
  color-scheme: dark;
  --bg: #06070b;
  --panel: rgba(14, 17, 27, 0.94);
  --text: #eef3ff;
  --muted: #9aa7c7;
  --cyan: #00d8ff;
  --amber: #ffcb74;
  --line: rgba(255, 255, 255, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top, rgba(0, 216, 255, 0.14), transparent 30%),
    linear-gradient(180deg, #080a11 0%, #04050a 100%);
  color: var(--text);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

body {
  display: flex;
  justify-content: center;
  padding: 32px 18px 56px;
}

.shell {
  width: min(860px, 100%);
}

.panel {
  background: linear-gradient(180deg, rgba(18, 21, 34, 0.96), rgba(10, 12, 20, 0.92));
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 28px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(30px, 5vw, 42px);
  line-height: 1.08;
}

.sub {
  margin-top: 12px;
  color: var(--muted);
}

.block {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.block:first-of-type {
  margin-top: 24px;
}

h2 {
  margin: 0 0 10px;
  font-size: 21px;
}

ul {
  padding-left: 22px;
}

a {
  color: var(--amber);
}

.meta {
  color: var(--muted);
}