/* =========================================================================
   Anli · 空间智能技术博客 — 主题样式
   专业学术风 / 响应式 / 深浅色自动切换
   ========================================================================= */

/* ---------- 设计令牌 ---------- */
:root {
  color-scheme: light;
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --bg-raise: #eef1f6;
  --text: #1b2430;
  --text-soft: #5b6472;
  --text-faint: #8b94a3;
  --accent: #2563eb;
  --accent-2: #0d9488;
  --accent-3: #7c3aed;
  --accent-4: #d97706;
  --accent-ink: #1d4ed8;
  --on-accent: #ffffff;
  --border: #e4e8ef;
  --border-soft: #eef1f6;
  --code-bg: #f4f6fa;
  --code-text: #24292f;
  --callout-bg: #eef4ff;
  --callout-border: #bfdbfe;
  --callout-text: #1e40af;
  --link: #2563eb;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.05);
  --shadow-md: 0 10px 30px -12px rgba(16, 24, 40, 0.18);
  --shadow-lg: 0 24px 60px -24px rgba(16, 24, 40, 0.28);
  --radius: 14px;
  --radius-sm: 8px;
  --header-h: 62px;
  --content-w: 720px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Cascadia Code", Consolas,
    "Liberation Mono", "Courier New", monospace;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b1220;
  --bg-soft: #101a2e;
  --bg-raise: #16223a;
  --text: #e6ebf4;
  --text-soft: #a3afc2;
  --text-faint: #6d7a90;
  --accent: #60a5fa;
  --accent-2: #2dd4bf;
  --accent-3: #a78bfa;
  --accent-4: #fbbf24;
  --accent-ink: #93c5fd;
  --on-accent: #0b1220;
  --border: #223049;
  --border-soft: #18243a;
  --code-bg: #0d1626;
  --code-text: #dbe4f0;
  --callout-bg: rgba(96, 165, 250, 0.12);
  --callout-border: rgba(96, 165, 250, 0.35);
  --callout-text: #93c5fd;
  --link: #60a5fa;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 30px -12px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 24px 60px -24px rgba(0, 0, 0, 0.6);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background 0.25s ease, color 0.25s ease;
}

a {
  color: var(--link);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

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

::selection {
  background: rgba(37, 99, 235, 0.22);
}

.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--border-soft);
}

.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.2px;
}
.brand:hover {
  text-decoration: none;
}
.brand .logo {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #fff;
  font-size: 15px;
  font-weight: 800;
  flex: none;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.main-nav a {
  color: var(--text-soft);
  font-size: 14.5px;
  font-weight: 500;
  padding: 7px 12px;
  border-radius: 8px;
  transition: color 0.15s, background 0.15s;
}
.main-nav a:hover {
  color: var(--text);
  background: var(--bg-raise);
  text-decoration: none;
}
.main-nav a.active {
  color: var(--accent-ink);
  background: var(--callout-bg);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-soft);
  border-radius: 10px;
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 16px;
  transition: all 0.15s;
}
.icon-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.theme-toggle .sun {
  display: none;
}
html[data-theme="dark"] .theme-toggle .sun {
  display: inline;
}
html[data-theme="dark"] .theme-toggle .moon {
  display: none;
}

/* ---------- 移动端汉堡菜单按钮 ---------- */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-soft);
  border-radius: 10px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  transition: color 0.15s, border-color 0.15s;
}
.nav-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.nav-toggle .bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.25s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] .bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 首页 Hero ---------- */
.hero {
  padding: 84px 0 48px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -40% -10% auto auto;
  width: 640px;
  height: 640px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%,
      color-mix(in srgb, var(--accent) 16%, transparent), transparent 62%);
  pointer-events: none;
}
.hero .container {
  position: relative;
  max-width: 900px;
  text-align: center;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.2px;
  color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-2) 28%, transparent);
  padding: 5px 14px;
  border-radius: 999px;
  text-transform: uppercase;
}

.hero h1 {
  margin: 22px 0 0;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.2;
  letter-spacing: -0.5px;
  font-weight: 800;
  color: var(--text);
}
.hero h1 .grad {
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.lead {
  margin: 18px auto 0;
  max-width: 640px;
  color: var(--text-soft);
  font-size: 17px;
}

.hero-meta {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  justify-content: center;
  color: var(--text-faint);
  font-size: 13.5px;
}
.hero-meta b {
  color: var(--text-soft);
  font-weight: 600;
}

/* ---------- 首页分区 ---------- */
.section {
  padding: 26px 0 60px;
}
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}
.section-title {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.2px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-title .bar {
  width: 5px;
  height: 22px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
}
.section-sub {
  color: var(--text-faint);
  font-size: 13.5px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 22px;
}

.post-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s;
}
.post-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}
.post-card:hover .card-title {
  color: var(--accent-ink);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}
.card-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-ink);
  background: var(--callout-bg);
  border: 1px solid var(--callout-border);
  border-radius: 7px;
  padding: 2px 9px;
}
.card-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-soft);
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--bg-raise);
}
.card-tag.cg {
  color: var(--accent-ink);
  background: var(--callout-bg);
}
.card-tag.ai {
  color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 12%, transparent);
}
.card-tag.fusion {
  color: var(--accent-3);
  background: color-mix(in srgb, var(--accent-3) 12%, transparent);
}
.card-tag.cur {
  color: var(--accent-ink);
  background: var(--callout-bg);
}
.card-tag.rec {
  color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 12%, transparent);
}
.card-tag.stack {
  color: var(--accent-3);
  background: color-mix(in srgb, var(--accent-3) 12%, transparent);
}
.card-tag.prac {
  color: var(--accent-4);
  background: color-mix(in srgb, var(--accent-4) 12%, transparent);
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
  margin: 0 0 8px;
  transition: color 0.15s;
}
.post-card a {
  color: inherit;
}
.post-card a:hover {
  text-decoration: none;
}
.card-excerpt {
  color: var(--text-soft);
  font-size: 14.5px;
  line-height: 1.65;
  margin: 0 0 16px;
  flex: 1;
}
.card-foot {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text-faint);
  font-size: 12.5px;
}
.read-more {
  margin-left: auto;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--accent-ink);
}
.card-foot .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--text-faint);
}

/* ---------- 首页系列大卡 ---------- */
.series-section {
  padding: 8px 0 52px;
}
.series-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
}
.series-card {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s;
}
.series-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
  text-decoration: none;
}
.series-cover {
  aspect-ratio: 16 / 9;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border-soft);
  overflow: hidden;
}
.series-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}
.series-card:hover .series-cover img {
  transform: scale(1.045);
}
.series-body {
  padding: 20px 22px 22px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.series-tag {
  align-self: flex-start;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-soft);
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--bg-raise);
  margin-bottom: 12px;
}
.series-tag.cur {
  color: var(--accent-ink);
  background: var(--callout-bg);
}
.series-tag.rec {
  color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 12%, transparent);
}
.series-tag.stack {
  color: var(--accent-3);
  background: color-mix(in srgb, var(--accent-3) 12%, transparent);
}
.series-tag.prac {
  color: var(--accent-4);
  background: color-mix(in srgb, var(--accent-4) 12%, transparent);
}
.series-title {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.2px;
  line-height: 1.35;
  color: var(--text);
  margin: 0 0 10px;
  transition: color 0.15s;
}
.series-card:hover .series-title {
  color: var(--accent-ink);
}
.series-sub {
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.65;
  margin: 0 0 18px;
  flex: 1;
}
.series-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--text-faint);
  font-size: 13px;
}
.series-foot b {
  color: var(--text-soft);
  font-weight: 600;
}
.series-link {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--accent-ink);
}

/* ---------- 布局：文章页 ---------- */
.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: 44px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.article-main {
  min-width: 0;
  max-width: var(--content-w);
  margin: 0 auto;
  width: 100%;
}

.post-header {
  margin-bottom: 34px;
}
.post-header .crumbs {
  font-size: 13px;
  color: var(--text-faint);
  margin-bottom: 14px;
}
.post-header .crumbs a {
  color: var(--text-soft);
}
.post-header .crumbs a:hover {
  color: var(--accent-ink);
}
.post-header h1 {
  margin: 0 0 14px;
  font-size: clamp(26px, 3.6vw, 36px);
  line-height: 1.28;
  letter-spacing: -0.4px;
  font-weight: 800;
  color: var(--text);
}
.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  color: var(--text-faint);
  font-size: 13.5px;
}
.post-meta .sep {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-faint);
}
.post-meta .tag {
  color: var(--accent-ink);
  background: var(--callout-bg);
  border: 1px solid var(--callout-border);
  border-radius: 999px;
  padding: 1px 10px;
  font-size: 12.5px;
  font-weight: 600;
}
.post-header .lead {
  margin-top: 18px;
  padding: 16px 20px;
  border-left: 3px solid var(--accent);
  background: var(--bg-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-soft);
  font-size: 15.5px;
}

/* ---------- 文章正文排版 ---------- */
.article-body {
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--text);
}

.article-body > * + * {
  margin-top: 1.1em;
}

.article-body h2 {
  font-size: 25px;
  font-weight: 800;
  letter-spacing: -0.3px;
  color: var(--text);
  margin-top: 2.2em;
  padding-top: 0.4em;
  border-top: 1px solid var(--border-soft);
  scroll-margin-top: calc(var(--header-h) + 20px);
}
.article-body h2::before {
  content: "§";
  margin-right: 10px;
  color: var(--accent);
  font-weight: 800;
}
.article-body h3 {
  font-size: 19.5px;
  font-weight: 700;
  color: var(--text);
  margin-top: 1.8em;
  scroll-margin-top: calc(var(--header-h) + 20px);
}
.article-body h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.article-body p {
  margin: 0;
}

.article-body strong {
  color: var(--text);
  font-weight: 650;
}

.article-body ul,
.article-body ol {
  padding-left: 1.4em;
  margin: 0;
}
.article-body li {
  margin: 0.35em 0;
}
.article-body li::marker {
  color: var(--accent);
}

.article-body a {
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
}
.article-body a:hover {
  border-bottom-color: var(--accent);
  text-decoration: none;
}

/* ---------- 推导要点 callout ---------- */
.article-body blockquote {
  margin: 1.5em 0;
  padding: 16px 20px;
  background: var(--callout-bg);
  border: 1px solid var(--callout-border);
  border-radius: var(--radius-sm);
  color: var(--callout-text);
  font-size: 15px;
}
.article-body blockquote p {
  margin: 0.3em 0;
}
.article-body blockquote p:first-child::before {
  content: "◈ ";
  font-weight: 700;
}

/* ---------- 行内代码 ---------- */
.article-body code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--code-bg);
  color: var(--accent-ink);
  padding: 2px 6px;
  border-radius: 5px;
  border: 1px solid var(--border);
  word-break: break-word;
}
html[data-theme="dark"] .article-body code:not(pre code) {
  color: #7dd3fc;
}

/* ---------- 代码块 ---------- */
.article-body pre {
  margin: 1.5em 0;
  position: relative;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  overflow-x: auto;
  line-height: 1.65;
  font-size: 14px;
}
.article-body pre code {
  font-family: var(--font-mono);
  background: transparent;
  border: none;
  padding: 0;
  color: var(--code-text);
}

.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 1.5em 0 0;
  padding: 9px 14px;
  background: var(--bg-raise);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-soft);
}
.code-head + pre {
  margin-top: 0;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}
.copy-btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text-faint);
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 6px;
  border-radius: 5px;
}
.copy-btn:hover {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

/* ---------- 公式 ---------- */
.article-body .katex-display {
  margin: 1.4em 0;
  padding: 14px 18px;
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  overflow-x: auto;
}
.article-body .katex {
  font-size: 1.06em;
}

/* ---------- 表格 ---------- */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 14.5px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: block;
  overflow-x: auto;
}
.article-body thead th {
  background: var(--bg-raise);
  color: var(--text);
  font-weight: 700;
  text-align: left;
  padding: 11px 16px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.article-body tbody td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-soft);
  vertical-align: top;
}
.article-body tbody tr:last-child td {
  border-bottom: none;
}
.article-body tbody tr:nth-child(even) {
  background: var(--bg-soft);
}
.article-body tbody td:first-child {
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent-ink);
}

/* ---------- 插图 ---------- */
.figure {
  margin: 1.8em 0;
  text-align: center;
}
.figure img {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  background: #fff;
}
.figcaption {
  margin-top: 10px;
  font-size: 13.5px;
  color: var(--text-faint);
}

/* ---------- 文章导航（上一篇/下一篇） ---------- */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 48px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
}
.post-nav a {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  transition: all 0.15s;
}
.post-nav a:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  transform: translateY(-2px);
}
.post-nav .dir {
  font-size: 12px;
  color: var(--text-faint);
  display: block;
  margin-bottom: 4px;
}
.post-nav .t {
  font-size: 15px;
  font-weight: 600;
}
.post-nav a.next {
  text-align: right;
}

/* ---------- 侧边 TOC ---------- */
.toc-wrap {
  display: none;
  position: sticky;
  top: calc(var(--header-h) + 24px);
  align-self: start;
  max-height: calc(100vh - var(--header-h) - 48px);
  overflow-y: auto;
}
.toc-box {
  border-left: 2px solid var(--border);
  padding-left: 18px;
}
.toc-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 12px;
}
.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.toc-list li {
  margin: 2px 0;
}
.toc-list a {
  display: block;
  color: var(--text-soft);
  font-size: 13.5px;
  line-height: 1.5;
  padding: 4px 0;
  border-left: 2px solid transparent;
  margin-left: -20px;
  padding-left: 18px;
  transition: color 0.15s, border-color 0.15s;
}
.toc-list a:hover {
  color: var(--accent-ink);
  text-decoration: none;
}
.toc-list li.active > a {
  color: var(--accent-ink);
  border-left-color: var(--accent);
  font-weight: 600;
}
.toc-list .lvl-2 {
  padding-left: 34px;
  font-size: 12.8px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding: 40px 0 46px;
  margin-top: 40px;
}
.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px;
}
.footer-brand .logo {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  display: inline-grid;
  place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  color: #fff;
  font-weight: 800;
  font-size: 14px;
  margin-right: 8px;
  vertical-align: middle;
}
.footer-brand b {
  color: var(--text);
  font-size: 16px;
}
.footer-brand p {
  margin: 8px 0 0;
  color: var(--text-faint);
  font-size: 13px;
  max-width: 380px;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links a {
  color: var(--text-soft);
  font-size: 14px;
}
.footer-links a:hover {
  color: var(--accent-ink);
}
.footer-bottom {
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid var(--border-soft);
  color: var(--text-faint);
  font-size: 12.5px;
  text-align: center;
}

/* ---------- 返回顶部 / 阅读进度 ---------- */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  z-index: 100;
  transition: width 0.1s linear;
}
.back-top {
  position: fixed;
  right: 24px;
  bottom: 26px;
  z-index: 60;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-soft);
  cursor: pointer;
  font-size: 18px;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
}
.back-top.show {
  opacity: 1;
  pointer-events: auto;
}
.back-top:hover {
  color: var(--accent);
  transform: translateY(-3px);
}

/* ---------- 关于页 ---------- */
.about-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}
.about-page h1 {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.4px;
  margin: 0 0 8px;
}
.about-page .lead {
  color: var(--text-soft);
  font-size: 16.5px;
}
.about-card {
  margin-top: 34px;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-soft);
}
.about-card h2 {
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 14px;
}
.about-card p {
  color: var(--text-soft);
  margin: 0 0 12px;
}
.about-card ul {
  color: var(--text-soft);
  margin: 0;
  padding-left: 1.3em;
}

/* ---------- 在线代码库 ---------- */
.code-page {
  padding: 44px 0 72px;
}
.code-page .container {
  max-width: 960px;
}
.code-hero {
  margin-bottom: 34px;
}
.code-hero .crumbs {
  font-size: 13px;
  color: var(--text-faint);
  margin-bottom: 14px;
}
.code-hero .crumbs a {
  color: var(--text-soft);
}
.code-hero .crumbs a:hover {
  color: var(--accent-ink);
}
.code-hero h1 {
  margin: 0 0 14px;
  font-size: clamp(26px, 3.6vw, 36px);
  line-height: 1.28;
  letter-spacing: -0.4px;
  font-weight: 800;
  color: var(--text);
}
.code-hero .lead {
  color: var(--text-soft);
  font-size: 16px;
  max-width: 760px;
}
.code-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}
.code-stats span {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 15px;
  font-size: 13px;
  color: var(--text-soft);
}
.code-stats b {
  color: var(--accent-ink);
  font-weight: 700;
}
.code-group {
  padding: 8px 0 6px;
}
.bar.cls-cur {
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
}
.bar.cls-rec {
  background: linear-gradient(180deg, #f59e0b, #ef4444);
}
.bar.cls-stack {
  background: linear-gradient(180deg, var(--accent-3), #db2777);
}
.bar.cls-prac {
  background: linear-gradient(180deg, var(--accent-2), var(--accent));
}
.bar.cls-tool {
  background: linear-gradient(180deg, var(--text-faint), var(--text-soft));
}

/* 代码库卡片 */
.code-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
  margin-bottom: 14px;
}
.code-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 20px 16px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s;
}
.code-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}
.code-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.code-fname {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--accent-ink);
  font-weight: 600;
  word-break: break-all;
}
.code-card .code-lines {
  font-size: 12px;
  color: var(--text-faint);
  white-space: nowrap;
}
.code-card-title {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}
.code-card-desc {
  margin: 0;
  font-size: 13.5px;
  color: var(--text-soft);
  line-height: 1.6;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.code-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
}
.code-series {
  font-size: 12px;
  color: var(--text-faint);
}
.code-card .view {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--accent);
}

/* 代码页元信息 */
.code-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  color: var(--text-faint);
  font-size: 13.5px;
  margin-top: 8px;
}
.code-meta .tag {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent-ink);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: 999px;
  padding: 3px 11px;
  font-size: 12px;
  font-weight: 600;
}
.code-meta .meta-sep {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--border);
}
.code-meta .no-dl {
  color: var(--text-soft);
}
.no-dl {
  -webkit-user-select: none;
  user-select: none;
}

/* 代码查看器（防下载核心区域） */
.code-viewer {
  margin: 26px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--code-bg);
  box-shadow: var(--shadow-sm);
}
.code-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 16px;
  background: var(--bg-raise);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-soft);
}
.code-toolbar span:first-child {
  color: var(--text);
  font-weight: 600;
  font-family: var(--font-sans);
}
.code-scroll {
  overflow-x: auto;
  max-height: 620px;
  overflow-y: auto;
}
.code-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  line-height: 1.65;
}
.code-table td {
  padding: 0;
  vertical-align: top;
}
.code-lines {
  width: 1%;
  border-right: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-raise) 60%, var(--code-bg));
}
.ln-pre {
  margin: 0;
  padding: 14px 12px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--text-faint);
  background: transparent;
  border: none;
  -webkit-user-select: none;
  user-select: none;
}
.ln-pre span {
  display: block;
  white-space: pre;
}
.code-body {
  min-width: 0;
}
.code-pre {
  margin: 0;
  padding: 14px 18px 16px;
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
}
.code-pre code {
  font-family: inherit;
  background: transparent;
  padding: 0;
}

/* 输出图 */
.code-figs {
  margin: 30px 0;
}
.code-figs h2 {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.code-figs h2::before {
  content: "";
  width: 5px;
  height: 20px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
}
.figs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px;
}
.figs-grid .figure {
  margin: 0;
}
.figs-grid img {
  width: 100%;
  height: auto;
}

/* 代码页导航（上一/下一脚本） */
.code-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 14px;
  margin-top: 44px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
  align-items: stretch;
}
.code-nav a {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  gap: 4px;
  transition: all 0.15s;
}
.code-nav a:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  transform: translateY(-2px);
}
.code-nav .dir {
  font-size: 12px;
  color: var(--text-faint);
}
.code-nav .t {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  word-break: break-all;
}
.code-nav a.up {
  align-items: center;
  justify-content: center;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--accent-ink);
}
.code-nav a.next {
  text-align: right;
}

/* 文章中指向代码库的内联链接 */
.code-link {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px dashed color-mix(in srgb, var(--link) 45%, transparent);
  white-space: nowrap;
}
.code-link code {
  color: var(--accent-ink);
  background: color-mix(in srgb, var(--accent) 8%, var(--bg));
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  padding: 1.5px 6px;
  font-size: 0.92em;
}
.code-link:hover {
  border-bottom-style: solid;
}
.code-link:hover code {
  background: color-mix(in srgb, var(--accent) 16%, var(--bg));
}

/* 防下载：代码区禁止选中/拖拽，页面禁止右键 */
.code-page[data-protect] .code-viewer,
.code-page[data-protect] .code-lines,
.code-page[data-protect] .ln-pre,
.code-page[data-protect] .code-pre {
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
  -webkit-user-drag: none;
}
.code-page[data-protect] img {
  pointer-events: none;
  -webkit-user-drag: none;
  user-drag: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 1080px) {
  .toc-wrap {
    display: block;
  }
}

@media (max-width: 860px) {
  .code-nav {
    grid-template-columns: 1fr;
  }
  .code-nav a.up {
    order: -1;
  }
  .code-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .article-layout {
    grid-template-columns: 1fr;
    padding: 28px 18px 60px;
  }
  .series-grid {
    grid-template-columns: 1fr;
  }
  .post-nav {
    grid-template-columns: 1fr;
  }

  /* 移动端：导航折叠为汉堡菜单下拉面板 */
  .nav-toggle {
    display: inline-flex;
  }
  .main-nav {
    display: none;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    z-index: 49;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 10px 16px 18px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }
  .main-nav.open {
    display: flex;
  }
  .main-nav a {
    padding: 12px 16px;
    font-size: 15px;
  }
}

@media (max-width: 560px) {
  .hero {
    padding: 56px 0 34px;
  }
  .container,
  .article-layout {
    padding-left: 16px;
    padding-right: 16px;
  }
  .card-grid {
    grid-template-columns: 1fr;
  }
  .series-grid {
    grid-template-columns: 1fr;
  }
  .article-body {
    font-size: 15.5px;
  }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}

/* ---------- 访问统计页 ---------- */
.stats-page {
  max-width: 860px;
}
.stats-page .hero-kicker {
  display: inline-block;
  margin-bottom: 10px;
}
.stats-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  padding: 0;
  border: none;
  background: transparent;
}
.stat-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.stat-num {
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--accent-ink);
  font-variant-numeric: tabular-nums;
}
.stat-label {
  font-size: 13px;
  color: var(--text-soft);
}
.daily-bars {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 190px;
  padding-top: 8px;
}
.bar-item {
  flex: 1;
  min-width: 14px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 4px;
}
.bar-item .bar {
  position: relative;
  min-height: 2px;
  border-radius: 4px 4px 0 0;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  transition: height 0.3s ease;
}
.bar-item .bar-val {
  position: absolute;
  top: -18px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 11px;
  color: var(--text-soft);
  font-variant-numeric: tabular-nums;
}
.bar-day {
  font-size: 10px;
  color: var(--text-faint);
  text-align: center;
  transform: rotate(-45deg);
  transform-origin: top center;
  white-space: nowrap;
  margin-top: 2px;
}
.stats-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.stats-table th,
.stats-table td {
  text-align: left;
  padding: 9px 10px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.stats-table th {
  color: var(--text-soft);
  font-weight: 600;
  font-size: 13px;
}
.stats-table td.pg {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Courier New", monospace;
  font-size: 13px;
  color: var(--accent-ink);
  word-break: break-all;
}
.stats-table td.tt {
  color: var(--text-soft);
}
.stats-table td:last-child,
.stats-table th:last-child {
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.loading-row {
  text-align: center;
  color: var(--text-faint);
  padding: 18px 0 !important;
}
.stats-empty {
  color: var(--text-faint);
  margin: 0;
}
@media (max-width: 560px) {
  .stats-table th:nth-child(2),
  .stats-table td:nth-child(2) {
    display: none;
  }
}