:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: rgba(15, 23, 42, 0.70);
  --line: rgba(15, 23, 42, 0.12);
  --accent: #2563eb;
  --accent2: #0ea5e9;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.10);
  --radius: 16px;
}

* { 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";
  color: var(--text);
  background: var(--bg);
}

a { color: inherit; }

.container {
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0 56px;
}

.header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
}

.header-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}

.top-badges {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 10px;
}

.brand {
  display: grid;
  gap: 10px;
}

.title {
  font-size: clamp(26px, 3.5vw, 40px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(37, 99, 235, 0.06);
  color: rgba(15, 23, 42, 0.76);
  font-size: 13px;
  user-select: none;
}

.flag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(37, 99, 235, 0.45);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.16), rgba(14, 165, 233, 0.10));
  color: rgba(15, 23, 42, 0.86);
  font-size: 13px;
  font-weight: 750;
  user-select: none;
}

.flag-dot {
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.18);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 0;
  justify-content: flex-end;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
  color: rgba(15, 23, 42, 0.82);
  text-decoration: none;
  font-size: 13px;
  font-weight: 650;
}

.nav-link:hover {
  border-color: rgba(37, 99, 235, 0.30);
  background: rgba(37, 99, 235, 0.06);
}

.nav-link.active {
  border-color: rgba(37, 99, 235, 0.45);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.10), rgba(14, 165, 233, 0.06));
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 18px;
}

@media (min-width: 860px) {
  .grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 16px;
  }
}

@media (max-width: 720px) {
  .header {
    flex-direction: column;
  }

  .header-right {
    align-items: flex-start;
    width: 100%;
  }

  .nav {
    justify-content: flex-start;
  }
}

.card {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card-header {
  padding: 16px 16px 0;
}

.card-title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
}

.card-body {
  padding: 14px 16px 16px;
  color: var(--muted);
  line-height: 1.65;
}

.codeblock {
  margin: 12px 0 0;
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: #f8fafc;
  border-radius: 14px;
  padding: 12px;
  overflow: auto;
}

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

.prose p {
  margin: 10px 0;
}

.prose ul,
.prose ol {
  margin: 10px 0;
  padding-left: 18px;
}

.prose li {
  margin: 6px 0;
}

.prose a {
  color: rgba(37, 99, 235, 0.95);
  text-decoration: none;
  border-bottom: 1px dashed rgba(37, 99, 235, 0.35);
}

.prose a:hover {
  border-bottom-color: rgba(14, 165, 233, 0.55);
}

.prose code {
  font-size: 12.5px;
  color: rgba(15, 23, 42, 0.88);
  background: rgba(37, 99, 235, 0.06);
  border: 1px solid rgba(37, 99, 235, 0.12);
  padding: 2px 6px;
  border-radius: 8px;
}

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

pre {
  margin: 0;
  font-size: 13px;
  color: rgba(15, 23, 42, 0.92);
  line-height: 1.55;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.button {
  appearance: none;
  border: 1px solid rgba(15, 23, 42, 0.14);
  background: rgba(255, 255, 255, 0.95);
  color: rgba(15, 23, 42, 0.90);
  border-radius: 12px;
  padding: 10px 12px;
  font-weight: 650;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}

.button:hover {
  transform: translateY(-1px);
  background: rgba(37, 99, 235, 0.06);
  border-color: rgba(37, 99, 235, 0.30);
}

.button.primary {
  border-color: rgba(37, 99, 235, 0.45);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.16), rgba(14, 165, 233, 0.10));
}

.kv {
  display: grid;
  gap: 10px;
  margin-top: 8px;
}

.kv-row {
  display: flex;
  gap: 10px;
  align-items: baseline;
  justify-content: space-between;
  border-top: 1px dashed rgba(15, 23, 42, 0.14);
  padding-top: 10px;
}

.kv-label {
  color: rgba(15, 23, 42, 0.78);
  font-weight: 650;
  font-size: 13px;
}

.kv-value {
  color: var(--muted);
  font-size: 13px;
  text-align: right;
}

.footer {
  margin-top: 16px;
  color: rgba(15, 23, 42, 0.58);
  font-size: 12px;
  line-height: 1.6;
}

.notice {
  border: 1px solid rgba(245, 158, 11, 0.25);
  background: rgba(245, 158, 11, 0.08);
  color: rgba(15, 23, 42, 0.88);
  border-radius: 14px;
  padding: 12px;
}

.steps {
  display: grid;
  gap: 12px;
  margin-top: 8px;
}

.step {
  border: 1px solid rgba(15, 23, 42, 0.10);
  background: rgba(255, 255, 255, 0.75);
  border-radius: 14px;
  padding: 12px;
}

.step-title {
  font-weight: 750;
  color: rgba(15, 23, 42, 0.86);
  margin-bottom: 6px;
}

.img-placeholder {
  margin-top: 10px;
  width: 100%;
  height: 190px;
  border-radius: 14px;
  border: 1px dashed rgba(15, 23, 42, 0.20);
  background: rgba(37, 99, 235, 0.04);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(15, 23, 42, 0.58);
  font-size: 13px;
  user-select: none;
}

.small {
  font-size: 12px;
  color: rgba(15, 23, 42, 0.68);
}

.copy-status {
  margin-left: 10px;
  font-size: 12px;
  color: rgba(14, 165, 233, 0.95);
}