/* =========================================================
   全站样式
   改配色：只改下面的 CSS 变量即可，不要逐个改颜色。
   ========================================================= */

:root {
  color-scheme: light;
  --bg: #f2f8ff;
  --text: #191b1a;
  --muted: #666b67;
  --line: #e4e6e3;
  --accent: #23604d;
  --accent-soft: #eaf1ed;
  --code-bg: #f5f6f4;
  --selection: #cfe2d9;
  --max-width: 720px;
  --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #1f1f1f;
    --text: #e8e8e6;
    --muted: #a4a4a1;
    --line: #343434;
    --accent: #8fc9b2;
    --accent-soft: #2a2a2a;
    --code-bg: #262626;
    --selection: #3d4a44;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #1f1f1f;
  --text: #e8e8e6;
  --muted: #a4a4a1;
  --line: #343434;
  --accent: #8fc9b2;
  --accent-soft: #2a2a2a;
  --code-bg: #262626;
  --selection: #3d4a44;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--selection);
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

h1,
h2,
h3 {
  line-height: 1.3;
  letter-spacing: -0.01em;
}

p {
  margin: 0 0 1.15em;
}

.wrap,
main {
  width: min(calc(100% - 2.5rem), var(--max-width));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 10;
  padding: 0.55rem 0.85rem;
  border-radius: 4px;
  background: var(--text);
  color: var(--bg);
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

/* ---------- 页头 ---------- */

.site-header {
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 1.1rem;
  padding: 1.4rem 0 1.1rem;
}

.brand {
  color: var(--text);
  font-size: 1.08rem;
  font-weight: 650;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.brand:hover {
  color: var(--accent);
}

.site-nav {
  margin-left: auto;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.93rem;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--text);
}

.site-nav a[aria-current="page"] {
  font-weight: 600;
}

.theme-toggle {
  display: inline-grid;
  place-items: center;
  width: 2.15rem;
  height: 2.15rem;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: var(--muted);
  color: var(--text);
}

.theme-toggle svg {
  width: 1rem;
  height: 1rem;
}

.theme-toggle .icon-sun {
  display: none;
}

:root[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

:root[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun {
    display: block;
  }

  :root:not([data-theme="light"]) .theme-toggle .icon-moon {
    display: none;
  }
}

/* ---------- 首页 ---------- */

.intro {
  padding: 3.5rem 0 3rem;
}

.intro h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.9rem, 6vw, 2.6rem);
  letter-spacing: -0.02em;
}

.intro p {
  max-width: 37em;
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
}

.section-label {
  margin: 0 0 0.9rem;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.12em;
}

.post-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.post-list > li {
  border-bottom: 1px solid var(--line);
}

.post-item {
  padding: 1.55rem 0 1.65rem;
}

.post-item h2 {
  margin: 0 0 0.35rem;
  font-size: 1.2rem;
}

.post-item h2 a {
  color: var(--text);
  text-decoration: none;
}

.post-item h2 a:hover {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
}

.post-meta {
  margin: 0 0 0.45rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}

.post-summary {
  margin: 0 0 0.65rem;
  color: var(--muted);
  font-size: 0.96rem;
}

.read-more {
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
}

.read-more:hover {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

/* ---------- 普通页面 ---------- */

.page-header {
  padding: 3rem 0 1.4rem;
}

.page-header h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(1.8rem, 5.5vw, 2.35rem);
}

.page-header .lede {
  max-width: 36em;
  margin: 0;
  color: var(--muted);
}

.avatar-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin: 0 0 2rem;
}

.avatar {
  display: block;
  flex: 0 0 auto;
  width: 5.5rem;
  height: 5.5rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--accent-soft);
  object-fit: cover;
}

/* ---------- 文章 ---------- */

.post-header {
  margin-bottom: 2rem;
  padding: 3rem 0 1.7rem;
  border-bottom: 1px solid var(--line);
}

.post-header h1 {
  margin: 0.45rem 0 1rem;
  font-size: clamp(1.65rem, 5.5vw, 2.25rem);
}

.post-header .post-meta {
  margin-bottom: 0;
}

.post-body {
  max-width: 38em;
  font-size: 1.02rem;
  line-height: 1.9;
}

.post-body h2 {
  margin: 2.2rem 0 0.7rem;
  font-size: 1.3rem;
}

.post-body h3 {
  margin: 1.8rem 0 0.6rem;
  font-size: 1.08rem;
}

.post-body ul,
.post-body ol {
  margin: 0 0 1.2em;
  padding-left: 1.35em;
}

.post-body li {
  margin-bottom: 0.35em;
}

.post-body blockquote {
  margin: 1.4rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--line);
  color: var(--muted);
}

.post-body hr {
  margin: 2.5rem 0;
  border: 0;
  border-top: 1px solid var(--line);
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
}

:not(pre) > code {
  padding: 0.08em 0.3em;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--code-bg);
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  margin: 1.4rem 0;
  padding: 1rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--code-bg);
  line-height: 1.65;
  -webkit-overflow-scrolling: touch;
}

pre code {
  font-size: 0.84rem;
  white-space: pre;
}

.post-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.92rem;
}

.post-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.post-nav a {
  flex: 1 1 12rem;
  min-width: 0;
  text-decoration: none;
}

.post-nav-next {
  margin-left: auto;
  text-align: right;
}

.post-nav-label {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.post-nav-title {
  display: block;
  color: var(--text);
  font-size: 0.92rem;
  line-height: 1.6;
  overflow-wrap: anywhere;
}

.post-nav a:hover .post-nav-title {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

/* ---------- 页脚 ---------- */

.site-footer {
  margin-top: 5rem;
  padding: 1.75rem 0 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.9;
}

.site-footer p {
  margin: 0 0 0.25rem;
}

.site-footer a {
  color: var(--muted);
}

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

/* ---------- 小屏 ---------- */

@media (max-width: 480px) {
  body {
    font-size: 16px;
  }

  .header-inner {
    padding-top: 1.1rem;
  }

  .intro {
    padding: 2.5rem 0 2.25rem;
  }

  .page-header {
    padding-top: 2.25rem;
  }

  .post-header {
    padding-top: 2.25rem;
  }

  .site-nav ul {
    gap: 0.85rem;
  }

  .post-item {
    padding: 1.35rem 0;
  }

  .avatar {
    width: 4.75rem;
    height: 4.75rem;
  }

  .site-footer {
    margin-top: 3.5rem;
  }
}