:root {
  --color-primary: #117fff;
  --color-primary-dark: #0d6fe6;
  --color-primary-light: #4da3ff;
  --color-primary-muted: #eff6ff;
  --color-primary-subtle: #e8f3ff;
  --color-accent: #f59e0b;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 48px rgba(15, 23, 42, 0.12);
  --radius: 12px;
  --font: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --header-h: 60px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  color: var(--color-primary-light);
}

.site-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: min(1120px, 100% - 48px);
  margin-inline: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 4px;
  font-size: 15px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s, border-color 0.15s, color 0.15s;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: none;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 2px 8px rgba(17, 127, 255, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid rgba(17, 127, 255, 0.45);
}

.btn-outline:hover {
  background: rgba(17, 127, 255, 0.08);
  border-color: var(--color-primary);
}

.btn-ghost {
  background: var(--color-surface);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.btn-ghost:hover {
  border-color: rgba(17, 127, 255, 0.35);
  background: var(--color-primary-muted);
  color: var(--color-primary);
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 8px;
}

.section-desc {
  color: var(--color-text-muted);
  max-width: 560px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.code-block {
  background: #0f172a;
  color: #e2e8f0;
  border-radius: var(--radius);
  padding: 16px 20px;
  font-family: 'Cascadia Code', 'Consolas', monospace;
  font-size: 13px;
  line-height: 1.55;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.page-main {
  flex: 1;
  padding-top: var(--header-h);
}

.page-section {
  padding: 64px 0;
}

@media (max-width: 768px) {
  .container {
    width: min(100% - 32px, 1120px);
  }
  .page-section {
    padding: 48px 0;
  }
}