:root {
  --bg: #0d1117;
  --bg-soft: #161b22;
  --bg-code: #010409;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #9da7b3;
  --accent: #7c9cff;
  --accent-2: #56d364;
  --warn: #f0b429;
  --danger: #ff7b72;
  --radius: 14px;
  --mono: "SFMono-Regular", "Cascadia Code", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #ffffff;
    --bg-soft: #f6f8fa;
    --bg-code: #f6f8fa;
    --border: #d0d7de;
    --text: #1f2328;
    --text-dim: #59636e;
    --accent: #2f6feb;
    --accent-2: #1a7f37;
    --warn: #9a6700;
    --danger: #cf222e;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 20px;
}

.hero {
  padding: 56px 0 32px;
  border-bottom: 1px solid var(--border);
  background: radial-gradient(1200px 400px at 50% -200px, rgba(124, 156, 255, 0.18), transparent 70%);
}

.hero .brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 18px;
}

.hero .logo { font-size: 16px; }

.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(28px, 5vw, 44px);
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle { margin: 0 0 6px; font-size: 18px; color: var(--text); }
.hint { margin: 0; color: var(--text-dim); font-size: 14px; }

main { padding: 28px 0 64px; }

.tabs {
  display: flex;
  gap: 8px;
  padding: 6px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 20px;
}

.tab {
  flex: 1;
  padding: 12px 16px;
  border: 0;
  background: transparent;
  color: var(--text-dim);
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
}

.tab:hover { color: var(--text); }

.tab.active {
  background: var(--bg);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
}

.panel { margin-bottom: 28px; }

.card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 16px;
}

.card h2 {
  margin: 0 0 4px;
  font-size: 22px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.card .desc { color: var(--text-dim); margin: 0 0 16px; font-size: 14px; }

.os-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 5px;
}

.os-btn {
  flex: 1;
  min-width: 90px;
  padding: 8px 12px;
  border: 0;
  background: transparent;
  color: var(--text-dim);
  font-family: inherit;
  font-size: 13px;
  border-radius: 7px;
  cursor: pointer;
  white-space: nowrap;
}

.os-btn.active {
  background: var(--accent);
  color: #fff;
}

.cmd-wrap {
  position: relative;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 0 0 8px;
}

.cmd-wrap pre {
  margin: 0;
  padding: 16px 56px 16px 16px;
  overflow-x: auto;
}

.cmd-wrap code {
  font-family: var(--mono);
  font-size: 13.5px;
  color: var(--text);
  white-space: pre;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text-dim);
  font-family: inherit;
  font-size: 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}

.copy-btn:hover { color: var(--text); border-color: var(--accent); }
.copy-btn.ok { color: var(--accent-2); border-color: var(--accent-2); }

.note { color: var(--text-dim); font-size: 13px; margin: 4px 0 0; }

details.alts {
  margin-top: 14px;
  border-top: 1px dashed var(--border);
  padding-top: 14px;
}

details.alts > summary {
  cursor: pointer;
  font-size: 14px;
  color: var(--text);
  font-weight: 600;
  list-style: none;
}

details.alts > summary::-webkit-details-marker { display: none; }
details.alts > summary::before { content: "▸ "; color: var(--text-dim); }
details.alts[open] > summary::before { content: "▾ "; }

.alt-list { margin-top: 12px; display: flex; flex-direction: column; gap: 10px; }

.alt-item label { display: block; font-size: 13px; color: var(--text-dim); margin-bottom: 4px; }

.dl-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.dl-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.15s;
}

.dl-btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.dl-btn .ico { font-size: 16px; }

.block {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 16px;
}

.block h2 { margin: 0 0 12px; font-size: 18px; }

.block code, .guide code, .faq code, .warn code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--bg-code);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 5px;
  color: var(--text);
}

.guide ol { margin: 0; padding-left: 20px; }
.guide ol li { margin-bottom: 8px; }

pre code {
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-all;
}

.warn { color: var(--warn); font-size: 13px; }

.faq details {
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.faq details:last-child { border-bottom: 0; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 15px; }
.faq p { margin: 8px 0 0; color: var(--text-dim); font-size: 14px; }

.disclaimer {
  font-size: 12px;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  padding-top: 16px;
  margin-top: 24px;
  line-height: 1.7;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  color: var(--text-dim);
  font-size: 13px;
}

.footer a { color: var(--accent); text-decoration: none; }
.footer a:hover { text-decoration: underline; }

@media (max-width: 600px) {
  .hero { padding: 36px 0 24px; }
  .card, .block { padding: 16px; }
  .cmd-wrap pre { padding: 14px 52px 14px 12px; }
}