:root {
  --bg: #f5f7fa;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --link: #0ea5e9;
  --code-bg: #f8fafc;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.06), 0 2px 6px rgba(0, 0, 0, 0.04);
}

html.theme-dark {
  --bg: #0b0f14;
  --panel: #111827;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --border: #1f2937;
  --link: #38bdf8;
  --code-bg: #0a0f14;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.5), 0 2px 8px rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: dark) {
  html:not(.theme-light) {
    --bg: #0b0f14;
    --panel: #111827;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #1f2937;
    --link: #38bdf8;
    --code-bg: #0a0f14;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.5), 0 2px 8px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
  background: var(--bg);
  color: var(--text);
}

.container {
  width: min(1100px, 92%);
  margin-left: auto;
  margin-right: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.site-title {
  font-size: 20px;
  margin: 0;
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  box-shadow: var(--shadow);
}
.btn:hover {
  filter: brightness(0.98);
}

.content {
  padding: 28px 0 40px;
}

.guide {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 24px;
}

.guide h2 {
  margin-top: 0;
}

.guide-step + .guide-step {
  margin-top: 20px;
}

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

p {
  color: var(--text);
}

small,
.muted {
  color: var(--muted);
}

pre {
  margin: 12px 0 0;
  padding: 12px 56px 12px 14px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: auto;
  position: relative;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 6px 10px;
  font-size: 12px;
  line-height: 1;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow);
}

.copy-btn:hover {
  filter: brightness(0.98);
}

.copy-btn.copied {
  background: #22c55e;
  border-color: #16a34a;
  color: #fff;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
}

@media (max-width: 720px) {
  .header-inner {
    padding: 12px 0;
  }
  .guide {
    padding: 18px;
  }
}