:root {
  --bg0: #0b1018;
  --bg1: #121a26;
  --ink: #e8eef8;
  --muted: #9aa8bd;
  --accent: #58c4dd;
  --accent-2: #8ec07c;
  --cn: #de2910;
  --cn-soft: rgba(222, 41, 16, 0.16);
  --line: rgba(232, 238, 248, 0.12);
  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --font-body: "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 700px at 12% -10%, rgba(88, 196, 221, 0.18), transparent 55%),
    radial-gradient(900px 600px at 100% 0%, rgba(142, 192, 124, 0.12), transparent 50%),
    linear-gradient(160deg, var(--bg0), var(--bg1) 55%, #0a0f16);
}

.stage {
  max-width: 820px;
  margin: 0 auto;
  padding: clamp(2.4rem, 8vh, 4.5rem) 1.4rem 3rem;
}

.brand {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7vw, 4.4rem);
  letter-spacing: 0.02em;
  line-height: 0.95;
  color: var(--accent);
}

h1 {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1.25;
}

.lede {
  margin: 0 0 1.6rem;
  max-width: 42rem;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.6;
}

.options {
  display: grid;
  gap: 0.9rem;
}

.option {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(8, 12, 18, 0.55);
  padding: 1rem 1rem 1.05rem;
}

.option-cn {
  border-color: rgba(222, 41, 16, 0.45);
  background:
    linear-gradient(135deg, var(--cn-soft), transparent 42%),
    rgba(8, 12, 18, 0.62);
  box-shadow: 0 0 0 1px rgba(222, 41, 16, 0.08);
}

.option-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.35rem;
}

.option-head h2 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 650;
  letter-spacing: 0.01em;
}

.flag {
  margin-right: 0.25rem;
  font-size: 1.15em;
}

.tag {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.18rem 0.55rem;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tag-cn {
  border-color: rgba(222, 41, 16, 0.55);
  color: #ffb4a8;
  background: rgba(222, 41, 16, 0.12);
}

.option-desc {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.install {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.7rem;
  align-items: stretch;
}

.cmd {
  border: 1px solid var(--line);
  background: rgba(4, 8, 14, 0.78);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  font-family: var(--font-mono);
  font-size: clamp(0.72rem, 1.9vw, 0.9rem);
  overflow-x: auto;
  white-space: nowrap;
}

.copy {
  border: 0;
  border-radius: 12px;
  padding: 0 1.15rem;
  background: linear-gradient(135deg, var(--accent), #3aa0c2);
  color: #041018;
  font-weight: 700;
  cursor: pointer;
}
.copy:hover { filter: brightness(1.05); }
.copy.copied { background: var(--accent-2); }

.copy-cn {
  background: linear-gradient(135deg, #de2910, #ff6b4a);
  color: #fff8f6;
}
.copy-cn.copied {
  background: #ffd166;
  color: #3a1d00;
}

.footnote {
  margin: 1.2rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}
.footnote code {
  font-family: var(--font-mono);
  font-size: 0.84em;
  color: #d7e6f5;
}

.links {
  margin-top: 1.6rem;
  display: flex;
  gap: 1.1rem;
  flex-wrap: wrap;
}
.links a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.15rem;
}
.links a:hover { color: var(--accent); border-color: var(--accent); }

@media (max-width: 720px) {
  .install { grid-template-columns: 1fr; }
  .copy { min-height: 2.8rem; }
  .option-head { align-items: flex-start; }
}