/* ============================================================
   ChatGPT 洞察 · 响应式文章站点样式
   作者：站点模板 / 纯静态，可直接部署到任意虚拟主机
   ============================================================ */

/* ---------- 设计变量（支持暗色模式） ---------- */
:root {
  --color-bg: #ffffff;
  --color-bg-soft: #f6f7fb;
  --color-surface: #ffffff;
  --color-surface-2: #f0f2f8;
  --color-border: #e6e8ef;
  --color-text: #1a1d29;
  --color-text-soft: #5b6172;
  --color-text-muted: #8a90a2;
  --color-primary: #6d5efc;
  --color-primary-soft: #efecff;
  --color-primary-strong: #4c3fd6;
  --color-accent: #00c2a8;
  --gradient-brand: linear-gradient(135deg, #6d5efc 0%, #9b6dff 50%, #00c2a8 100%);
  --gradient-soft: linear-gradient(135deg, #f3f0ff 0%, #eafff9 100%);
  --shadow-sm: 0 1px 2px rgba(20, 22, 40, .06);
  --shadow-md: 0 8px 24px rgba(20, 22, 40, .08);
  --shadow-lg: 0 18px 50px rgba(20, 22, 40, .14);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --container: 1180px;
  --header-h: 68px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", Consolas, Menlo, monospace;
}

[data-theme="dark"] {
  --color-bg: #0f1117;
  --color-bg-soft: #141822;
  --color-surface: #171b26;
  --color-surface-2: #1d2230;
  --color-border: #2a3040;
  --color-text: #eef0f6;
  --color-text-soft: #b3b9c9;
  --color-text-muted: #7c8398;
  --color-primary: #8b7dff;
  --color-primary-soft: #232040;
  --color-primary-strong: #a99bff;
  --color-accent: #2fe0c4;
  --gradient-soft: linear-gradient(135deg, #1b1840 0%, #0f2a26 100%);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, .45);
  --shadow-lg: 0 18px 50px rgba(0, 0, 0, .55);
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  transition: background .3s ease, color .3s ease;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; letter-spacing: -.01em; }
ul { margin: 0; padding: 0; list-style: none; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: color-mix(in srgb, var(--color-bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--color-border);
}
.nav {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.18rem;
  letter-spacing: -.02em;
}
.brand .logo {
  width: 34px; height: 34px;
  border-radius: 10px;
  background: var(--gradient-brand);
  display: grid; place-items: center;
  color: #fff; font-weight: 900; font-size: .95rem;
  box-shadow: var(--shadow-sm);
}
.brand .brand-name b { color: var(--color-primary); }
.nav-links {
  display: flex;
  gap: 4px;
  margin-left: auto;
}
.nav-links a {
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  color: var(--color-text-soft);
  font-weight: 600;
  font-size: .95rem;
  transition: background .2s, color .2s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}
.nav-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  display: grid; place-items: center;
  transition: background .2s, border-color .2s, transform .2s;
}
.icon-btn:hover { background: var(--color-surface-2); transform: translateY(-1px); }
.icon-btn svg { width: 20px; height: 20px; }
.theme-toggle .sun { display: none; }
[data-theme="dark"] .theme-toggle .sun { display: block; }
[data-theme="dark"] .theme-toggle .moon { display: none; }

/* 移动端汉堡 */
.hamburger {
  display: none;
  width: 42px; height: 42px;
  border-radius: 12px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  position: relative;
}
.hamburger span {
  position: absolute; left: 11px; right: 11px; height: 2px;
  background: var(--color-text); border-radius: 2px;
  transition: transform .3s, opacity .3s;
}
.hamburger span:nth-child(1) { top: 14px; }
.hamburger span:nth-child(2) { top: 20px; }
.hamburger span:nth-child(3) { top: 26px; }
body.menu-open .hamburger span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
body.menu-open .hamburger span:nth-child(2) { opacity: 0; }
body.menu-open .hamburger span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Hero 区 ---------- */
.hero {
  position: relative;
  padding: 72px 0 56px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: -40% -10% auto -10%;
  height: 620px;
  background: var(--gradient-soft);
  filter: blur(40px);
  opacity: .8;
  z-index: -1;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  margin: 0 0 18px;
}
.hero h1 .hl {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.lead {
  font-size: 1.12rem;
  color: var(--color-text-soft);
  max-width: 52ch;
  margin: 0 0 28px;
}
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 24px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: .98rem;
  border: 1px solid transparent;
  transition: transform .2s, box-shadow .2s, background .2s;
}
.btn-primary {
  background: var(--gradient-brand);
  color: #fff;
  box-shadow: var(--shadow-md);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-ghost {
  background: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text);
}
.btn-ghost:hover { background: var(--color-surface-2); }

/* Hero 装饰卡片 */
.hero-visual { position: relative; }
.glass-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 22px;
  max-width: 420px;
  margin-left: auto;
}
.glass-card .chat-head {
  display: flex; align-items: center; gap: 10px;
  padding-bottom: 14px; margin-bottom: 14px;
  border-bottom: 1px solid var(--color-border);
  font-weight: 700;
}
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot.r { background: #ff5f57; } .dot.y { background: #febc2e; } .dot.g { background: #28c840; }
.msg { padding: 12px 16px; border-radius: 14px; margin-bottom: 12px; font-size: .94rem; }
.msg.user { background: var(--color-primary-soft); color: var(--color-text); margin-left: 32px; }
.msg.bot { background: var(--color-surface-2); border: 1px solid var(--color-border); margin-right: 24px; }
.typing { display: inline-flex; gap: 4px; padding: 4px 2px; }
.typing i { width: 7px; height: 7px; border-radius: 50%; background: var(--color-text-muted); animation: blink 1.4s infinite both; }
.typing i:nth-child(2){ animation-delay: .2s; } .typing i:nth-child(3){ animation-delay: .4s; }
@keyframes blink { 0%,80%,100%{ opacity:.25; transform: translateY(0);} 40%{ opacity:1; transform: translateY(-3px);} }

/* ---------- 统计条 ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 8px 0 56px;
}
.stat {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.stat .num { font-size: 1.8rem; font-weight: 800; color: var(--color-primary); }
.stat .label { color: var(--color-text-muted); font-size: .9rem; }

/* ---------- 区块标题 ---------- */
.section { padding: 56px 0; }
.section-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 16px; margin-bottom: 28px; flex-wrap: wrap;
}
.section-head h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); margin: 0; }
.section-head p { margin: 6px 0 0; color: var(--color-text-soft); }
.link-more { color: var(--color-primary); font-weight: 700; white-space: nowrap; }

/* ---------- 分类筛选 ---------- */
.filters {
  display: flex; gap: 10px; flex-wrap: wrap;
  margin-bottom: 28px;
}
.chip {
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-soft);
  font-weight: 600; font-size: .92rem;
  transition: all .2s;
}
.chip:hover { border-color: var(--color-primary); color: var(--color-primary); }
.chip.active {
  background: var(--color-primary);
  color: #fff; border-color: var(--color-primary);
}

/* ---------- 文章卡片网格 ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--color-primary); }
.card .thumb {
  height: 168px;
  background: var(--gradient-brand);
  position: relative;
  display: grid; place-items: center;
  color: #fff;
}
.card .thumb .emoji { font-size: 3rem; filter: drop-shadow(0 4px 10px rgba(0,0,0,.25)); }
.card .thumb .cat-tag {
  position: absolute; top: 14px; left: 14px;
  background: rgba(255,255,255,.92);
  color: var(--color-primary-strong);
  font-size: .76rem; font-weight: 700;
  padding: 4px 12px; border-radius: var(--radius-pill);
}
.card .body { padding: 18px 20px 22px; display: flex; flex-direction: column; flex: 1; }
.card .meta {
  display: flex; gap: 12px; color: var(--color-text-muted);
  font-size: .82rem; margin-bottom: 10px; flex-wrap: wrap;
}
.card h3 { font-size: 1.18rem; margin: 0 0 8px; }
.card h3 a:hover { color: var(--color-primary); }
.card p.excerpt { color: var(--color-text-soft); font-size: .93rem; margin: 0 0 16px; flex: 1; }
.card .read {
  font-weight: 700; color: var(--color-primary); font-size: .9rem;
  display: inline-flex; align-items: center; gap: 6px;
}
.card .read svg { width: 16px; height: 16px; transition: transform .2s; }
.card:hover .read svg { transform: translateX(4px); }

/* 精选大卡 */
.featured {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  margin-bottom: 40px;
  background: var(--color-surface);
}
.featured .f-media {
  min-height: 320px;
  background: var(--gradient-brand);
  display: grid; place-items: center; color: #fff;
}
.featured .f-media .emoji { font-size: 5rem; filter: drop-shadow(0 6px 16px rgba(0,0,0,.3)); }
.featured .f-body { padding: 36px; display: flex; flex-direction: column; justify-content: center; }
.featured .f-body .cat-tag {
  align-self: flex-start;
  background: var(--color-primary-soft); color: var(--color-primary-strong);
  font-size: .78rem; font-weight: 700; padding: 5px 14px; border-radius: var(--radius-pill);
  margin-bottom: 16px;
}
.featured h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); margin: 0 0 14px; }
.featured p { color: var(--color-text-soft); margin: 0 0 22px; }

/* ---------- 搜索框 ---------- */
.search-wrap { position: relative; max-width: 360px; }
.search-wrap input {
  width: 100%;
  padding: 12px 16px 12px 42px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: .95rem;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.search-wrap input:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-soft); }
.search-wrap svg { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); width: 18px; height: 18px; color: var(--color-text-muted); }
.no-results { text-align: center; color: var(--color-text-muted); padding: 40px 0; display: none; }

/* ---------- 分页 ---------- */
.pager {
  display: flex; justify-content: center; align-items: center;
  gap: 8px; flex-wrap: wrap; margin: 40px 0 8px;
}
.page-btn {
  min-width: 42px; height: 42px; padding: 0 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text); font-weight: 600; font-size: .92rem;
  transition: all .2s;
}
.page-btn:hover:not(:disabled):not(.active) { border-color: var(--color-primary); color: var(--color-primary); }
.page-btn.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.page-btn:disabled { opacity: .4; cursor: not-allowed; }
.page-ellipsis { color: var(--color-text-muted); padding: 0 4px; }

/* ---------- 文章详情页 ---------- */
.post-hero { padding: 48px 0 8px; }
.breadcrumb { color: var(--color-text-muted); font-size: .88rem; margin-bottom: 16px; }
.breadcrumb a:hover { color: var(--color-primary); }
.post-title { font-size: clamp(1.8rem, 4vw, 2.8rem); margin: 0 0 18px; }
.post-meta { display: flex; gap: 18px; align-items: center; color: var(--color-text-soft); font-size: .92rem; flex-wrap: wrap; margin-bottom: 24px; }
.post-meta .author { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--color-text); }
.avatar { width: 38px; height: 38px; border-radius: 50%; background: var(--gradient-brand); color: #fff; display: grid; place-items: center; font-weight: 700; }
.post-cover {
  height: clamp(220px, 38vw, 420px);
  border-radius: var(--radius-lg);
  background: var(--gradient-brand);
  display: grid; place-items: center; color: #fff; margin: 10px 0 36px;
}
.post-cover .emoji { font-size: 6rem; filter: drop-shadow(0 8px 20px rgba(0,0,0,.3)); }
.post-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 48px;
  align-items: start;
}
.article { font-size: 1.06rem; color: var(--color-text); }
.article h2 { font-size: 1.6rem; margin: 38px 0 14px; }
.article h3 { font-size: 1.25rem; margin: 28px 0 12px; }
.article p { margin: 0 0 18px; color: var(--color-text); }
.article ul.bullets { margin: 0 0 20px; padding-left: 22px; list-style: disc; }
.article ul.bullets li { margin-bottom: 8px; }
.article blockquote {
  margin: 24px 0; padding: 16px 22px;
  border-left: 4px solid var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-text-soft); font-style: italic;
}
.article pre {
  background: #0f1117; color: #e6e8f0;
  padding: 18px 20px; border-radius: var(--radius-md);
  overflow-x: auto; font-size: .9rem; margin: 0 0 20px;
}
.article pre code { font-family: var(--font-mono); }
.article code:not(pre code) {
  background: var(--color-surface-2); padding: 2px 7px; border-radius: 6px;
  font-family: var(--font-mono); font-size: .9em; color: var(--color-primary-strong);
}
.callout {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px; margin: 24px 0;
}
.callout b { color: var(--color-primary); }

/* Markdown 渲染输出（Decap CMS 可视化编辑的正文） */
.article ul, .article ol { margin: 0 0 20px; padding-left: 24px; }
.article ul { list-style: disc; }
.article ol { list-style: decimal; }
.article li { margin-bottom: 8px; }
.article a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 3px; }
.article a:hover { color: var(--color-primary-strong); }
.article strong { color: var(--color-text); }
.article table { width: 100%; border-collapse: collapse; margin: 0 0 20px; font-size: .95rem; }
.article th, .article td { border: 1px solid var(--color-border); padding: 10px 12px; text-align: left; }
.article th { background: var(--color-surface-2); }
.article hr { border: none; border-top: 1px solid var(--color-border); margin: 28px 0; }
.article blockquote p { margin: 0; }

/* 目录（TOC） */
.toc {
  position: sticky; top: calc(var(--header-h) + 20px);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}
.toc h4 { margin: 0 0 12px; font-size: .95rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: .06em; }
.toc a { display: block; padding: 6px 0; color: var(--color-text-soft); font-size: .9rem; border-left: 2px solid transparent; padding-left: 12px; transition: all .2s; }
.toc a:hover { color: var(--color-primary); border-left-color: var(--color-primary); }

/* 相关文章 */
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

/* 评论占位 */
.comments { margin-top: 48px; }
.comment-box {
  background: var(--color-surface-2);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px; text-align: center; color: var(--color-text-muted);
}

/* 分享栏 */
.share-bar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-top: 40px; padding: 16px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.share-label { font-weight: 700; color: var(--color-text-soft); }
.share-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 16px; border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text); font-weight: 600; font-size: .9rem;
  transition: all .2s;
}
.share-btn:hover { border-color: var(--color-primary); color: var(--color-primary); transform: translateY(-1px); }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--color-bg-soft);
  border-top: 1px solid var(--color-border);
  padding: 56px 0 28px;
  margin-top: 64px;
}
.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr; gap: 32px;
  margin-bottom: 36px;
}
.footer-grid h4 { font-size: .95rem; margin: 0 0 14px; }
.footer-grid a { display: block; color: var(--color-text-soft); padding: 5px 0; font-size: .92rem; }
.footer-grid a:hover { color: var(--color-primary); }
.footer-about p { color: var(--color-text-soft); font-size: .92rem; max-width: 34ch; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 22px; border-top: 1px solid var(--color-border);
  color: var(--color-text-muted); font-size: .86rem; flex-wrap: wrap; gap: 10px;
}

/* ---------- 移动端抽屉菜单 ---------- */
.mobile-menu {
  position: fixed; inset: var(--header-h) 0 0 0;
  background: var(--color-bg);
  padding: 24px;
  transform: translateX(100%);
  transition: transform .3s ease;
  z-index: 90;
  overflow-y: auto;
}
body.menu-open .mobile-menu { transform: translateX(0); }
.mobile-menu a {
  display: block; padding: 14px 8px;
  border-bottom: 1px solid var(--color-border);
  font-size: 1.05rem; font-weight: 600; color: var(--color-text);
}
.mobile-menu a:hover { color: var(--color-primary); }

/* ---------- 动画 ---------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式断点 ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .glass-card { margin: 0 auto; }
  .grid, .related-grid { grid-template-columns: repeat(2, 1fr); }
  .featured { grid-template-columns: 1fr; }
  .featured .f-media { min-height: 220px; }
  .post-layout { grid-template-columns: 1fr; }
  .toc { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .nav-links, .nav-actions .icon-btn.search-only { display: none; }
  .hamburger { display: block; margin-left: auto; }
  .grid, .related-grid { grid-template-columns: 1fr; }
  .section { padding: 40px 0; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero { padding: 48px 0 32px; }
  .stats { margin-bottom: 36px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto; }
}