:root {
  --bg: #0f1115;
  --surface: #161a21;
  --border: #262b34;
  --text: #e6e6eb;
  --muted: #9aa0a6;
  --accent: #6aa9ff;
  --accent-dim: #2d4a75;
  --maxw: 46rem;
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans SC", sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  background: var(--bg);
  color: var(--text);
}

/* 键盘用户的跳转链接，鼠标用户看不到 */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #0f1115;
  z-index: 10;
}

.skip-link:focus {
  left: 0;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: #8fc0ff;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* 页头与导航 */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 0;
}

.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
}

.brand {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.95rem;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}

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

/* 当前页用颜色和下划线双重标识，不只靠颜色 */
.nav a[aria-current="page"] {
  color: var(--text);
  border-bottom-color: var(--accent);
}

/* 主体 */
main {
  flex: 1;
  padding: 3rem 0;
}

h1 {
  font-size: 1.9rem;
  line-height: 1.3;
  margin: 0 0 0.75rem;
}

h2 {
  font-size: 1.25rem;
  margin: 2.5rem 0 0.75rem;
}

p {
  margin: 0 0 1rem;
}

.lead {
  font-size: 1.1rem;
  color: var(--muted);
  margin-bottom: 2rem;
}

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

ul,
ol {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
}

li {
  margin-bottom: 0.4rem;
}

code {
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.9em;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}

/* 卡片列表，用于项目页 */
.cards {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.1rem 1.25rem;
  margin: 0;
}

.card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.tag {
  display: inline-block;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--accent-dim);
  border-radius: 999px;
  padding: 0 0.6em;
  margin-left: 0.5rem;
  vertical-align: 0.15em;
}

/* 定义列表，用于联系页 */
.pairs {
  margin: 0;
}

.pairs dt {
  font-weight: 600;
  margin-top: 1rem;
}

.pairs dd {
  margin: 0.15rem 0 0;
  color: var(--muted);
}

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  font-size: 0.875rem;
  color: var(--muted);
}

@media (min-width: 40rem) {
  h1 {
    font-size: 2.25rem;
  }

  main {
    padding: 4rem 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}