/* ====== 全局骨架 v7.0 SEO主管版 —— 大气排版 · 中文阅读优化 ====== */
:root{
  --c-primary:#b98f3e;
  --c-primary-dark:#9a7327;
  --c-primary-light:#d4af60;
  --c-bg:#ffffff;
  --c-bg-alt:#f7f8fa;
  --c-card:#ffffff;
  --c-border:#e5e7eb;
  --c-border-strong:#d1d5db;
  --c-text:#1f2937;
  --c-text-mute:#6b7280;
  --c-text-light:#9ca3af;
  --c-link:var(--c-primary);
  --c-link-hover:var(--c-primary-dark);
  --c-code-bg:#f3f4f6;
  --radius:8px;
  --radius-lg:12px;
  --shadow-sm:0 1px 2px rgba(0,0,0,0.04);
  --shadow:0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg:0 12px 32px rgba(0,0,0,0.08);
  --font-sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",sans-serif;
  --font-serif:"Source Han Serif SC","Noto Serif CJK SC","Songti SC","SimSun",Georgia,"Times New Roman",serif;
  --font-mono:"JetBrains Mono",Consolas,"SF Mono",Menlo,Monaco,"Courier New",monospace;
  --header-h:64px;
  --max-w:1200px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{-webkit-text-size-adjust:100%;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;scroll-behavior:smooth;}
body{font-family:var(--font-sans);font-size:16px;line-height:1.8;color:var(--c-text);background:var(--c-bg);}
img{max-width:100%;height:auto;display:block;}
a{color:var(--c-link);text-decoration:none;transition:color .2s;}
a:hover{color:var(--c-link-hover);}
ul,ol{list-style:none;}
button{font-family:inherit;cursor:pointer;border:none;background:none;}
h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.4;color:var(--c-text);letter-spacing:-0.01em;}
.wrap{max-width:var(--max-w);margin:0 auto;padding:0 24px;width:100%;}

/* ====== 头部导航 ====== */
.site-header{position:sticky;top:0;z-index:100;background:var(--c-bg);border-bottom:1px solid var(--c-border);box-shadow:var(--shadow-sm);backdrop-filter:saturate(180%) blur(10px);-webkit-backdrop-filter:saturate(180%) blur(10px);}
.main-nav-wrap{display:flex;align-items:center;justify-content:space-between;height:var(--header-h);gap:32px;}
.logo a{font-size:22px;font-weight:800;color:var(--c-text);letter-spacing:-0.02em;display:flex;align-items:center;gap:8px;}
.logo a::before{content:'';display:inline-block;width:8px;height:28px;background:var(--c-primary);border-radius:2px;}
.main-nav{flex:1;}
.main-nav ul{display:flex;align-items:center;gap:4px;flex-wrap:wrap;}
.main-nav a{display:block;padding:8px 16px;border-radius:var(--radius);color:var(--c-text-mute);font-size:15px;font-weight:500;transition:all .2s;white-space:nowrap;}
.main-nav a:hover{color:var(--c-primary);background:var(--c-bg-alt);}
.main-nav a.current{color:var(--c-primary);background:color-mix(in srgb,var(--c-primary) 10%,transparent);font-weight:600;}
.menu-toggle{display:none;width:40px;height:40px;border-radius:var(--radius);font-size:22px;color:var(--c-text);align-items:center;justify-content:center;}
.menu-toggle:hover{background:var(--c-bg-alt);}

/* ====== 页面通用 ====== */
main{padding-top:32px;padding-bottom:64px;min-height:calc(100vh - var(--header-h) - 200px);}
main::after{content:'';display:block;clear:both;}
.breadcrumb{font-size:14px;color:var(--c-text-light);margin-bottom:16px;padding:12px 0;}
.breadcrumb a{color:var(--c-text-mute);}
.breadcrumb a:hover{color:var(--c-primary);}
.breadcrumb span{margin:0 8px;color:var(--c-text-light);}
.breadcrumb span:last-child{color:var(--c-text);}

/* ====== Hero 区（文章标题头部） ====== */
.hero{padding:48px 0 32px;text-align:left;}
.hero h1{font-size:40px;font-weight:800;line-height:1.25;margin-bottom:16px;letter-spacing:-0.02em;background:linear-gradient(135deg,var(--c-text) 0%,var(--c-primary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;}
.hero p{font-size:18px;color:var(--c-text-mute);line-height:1.7;max-width:800px;}

/* ====== 文章元信息条 ====== */
.article-meta{display:flex;flex-wrap:wrap;gap:20px;padding:16px 24px;background:var(--c-bg-alt);border-radius:var(--radius-lg);margin-bottom:32px;font-size:14px;color:var(--c-text-mute);border-left:4px solid var(--c-primary);}
.meta-item{display:inline-flex;align-items:center;gap:6px;}
.meta-item time{color:var(--c-text);font-variant-numeric:tabular-nums;}

/* ====== 封面大图 ====== */
.article-cover{margin:0 0 40px;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-lg);background:var(--c-bg-alt);}
.article-cover img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block;}
.article-cover-auto .cover-grad{width:100%;aspect-ratio:16/9;background:linear-gradient(135deg,var(--c-primary) 0%,var(--c-primary-dark) 50%,color-mix(in srgb,var(--c-primary) 60%,#000) 100%);display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;}
.article-cover-auto .cover-grad::before{content:'';position:absolute;inset:0;background:radial-gradient(circle at 30% 30%,rgba(255,255,255,0.15) 0%,transparent 50%),radial-gradient(circle at 70% 70%,rgba(0,0,0,0.2) 0%,transparent 50%);}
.article-cover-auto .cover-char{font-family:var(--font-serif);font-size:200px;font-weight:900;color:rgba(255,255,255,0.85);line-height:1;text-shadow:0 8px 32px rgba(0,0,0,0.3);position:relative;z-index:1;}
.article-cover-cap{padding:16px 24px;background:var(--c-card);font-size:14px;color:var(--c-text-mute);text-align:center;border-top:1px solid var(--c-border);}

/* ====== 文章正文 —— 中文阅读优化（大气排版） ====== */
.article-body{font-size:17px;line-height:1.9;color:#2d3748;max-width:100%;}
.article-body::after{content:'';display:block;clear:both;}
.article-body > *:first-child{margin-top:0;}
.article-body h2{font-size:28px;font-weight:700;margin:48px 0 20px;padding-bottom:12px;border-bottom:2px solid var(--c-primary);position:relative;scroll-margin-top:calc(var(--header-h) + 20px);}
.article-body h2::before{content:'';position:absolute;left:0;bottom:-2px;width:60px;height:4px;background:var(--c-primary);border-radius:2px;}
.article-body h3{font-size:22px;font-weight:700;margin:36px 0 16px;padding-left:14px;border-left:4px solid var(--c-primary-light);scroll-margin-top:calc(var(--header-h) + 20px);}
.article-body h4{font-size:18px;font-weight:700;margin:28px 0 12px;}
.article-body p{margin:0 0 22px;text-align:justify;text-justify:inter-ideograph;letter-spacing:0.01em;}
.article-body strong{color:var(--c-text);font-weight:700;background:linear-gradient(transparent 60%,color-mix(in srgb,var(--c-primary) 25%,transparent) 60%);padding:0 2px;}
.article-body em{font-style:normal;color:var(--c-primary-dark);font-weight:600;}
.article-body ul,.article-body ol{margin:0 0 22px;padding-left:0;}
.article-body ul li,.article-body ol li{position:relative;padding:0 0 12px 28px;line-height:1.8;}
.article-body ul li::before{content:'';position:absolute;left:8px;top:12px;width:8px;height:8px;background:var(--c-primary);border-radius:50%;}
.article-body ol{counter-reset:listnum;}
.article-body ol li{counter-increment:listnum;}
.article-body ol li::before{content:counter(listnum);position:absolute;left:0;top:4px;width:22px;height:22px;background:var(--c-primary);color:#fff;border-radius:50%;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center;line-height:1;}
.article-body blockquote{margin:24px 0;padding:20px 24px;background:var(--c-bg-alt);border-left:4px solid var(--c-primary);border-radius:0 var(--radius) var(--radius) 0;color:var(--c-text-mute);font-style:normal;font-size:16px;}
.article-body blockquote p:last-child{margin-bottom:0;}
.article-body code{background:var(--c-code-bg);color:#d63384;padding:2px 8px;border-radius:4px;font-family:var(--font-mono);font-size:0.9em;}
.article-body pre{background:#1e293b;color:#e2e8f0;padding:20px 24px;border-radius:var(--radius);overflow-x:auto;margin:22px 0;font-size:14px;line-height:1.6;}
.article-body pre code{background:transparent;color:inherit;padding:0;}
.article-body hr{border:none;height:1px;background:var(--c-border);margin:40px 0;}
.article-body img{margin:24px auto;border-radius:var(--radius-lg);box-shadow:var(--shadow);}
.article-body figure{margin:28px 0;text-align:center;}
.article-body figure img{margin:0 auto;}
.article-body figcaption{margin-top:12px;font-size:14px;color:var(--c-text-mute);}
.article-body table{width:100%;border-collapse:collapse;margin:24px 0;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);font-size:15px;}
.article-body th,.article-body td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--c-border);}
.article-body th{background:var(--c-bg-alt);font-weight:700;color:var(--c-text);}
.article-body tr:hover td{background:var(--c-bg-alt);}
.article-body a{border-bottom:1px solid color-mix(in srgb,var(--c-primary) 40%,transparent);padding-bottom:1px;}
.article-body a:hover{border-bottom-color:var(--c-primary);}

/* ====== 表格容器（横向滚动） ====== */
.table-wrap{overflow-x:auto;margin:24px 0;border-radius:var(--radius);}
.table-wrap table{margin:0;min-width:500px;}

/* ====== 文末声明 ====== */
.article-end{margin-top:48px;padding:24px 32px;background:linear-gradient(135deg,color-mix(in srgb,var(--c-primary) 6%,var(--c-bg-alt)),var(--c-bg-alt));border-radius:var(--radius-lg);border-left:4px solid var(--c-primary);}
.article-end-note{font-size:14px;color:var(--c-text-mute);margin:0 !important;line-height:1.8;}
.article-end-note time{color:var(--c-primary);font-weight:600;font-variant-numeric:tabular-nums;}

/* ====== 在线工具区 ====== */
.tools-section{margin-top:64px;padding:48px 0 0;}
.tools-header{text-align:center;margin-bottom:40px;}
.tools-header h2{font-size:32px;font-weight:800;margin-bottom:12px;}
.tools-sub{color:var(--c-text-mute);font-size:16px;max-width:680px;margin:0 auto;}
.tool-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px;}
.tool-card{display:block;padding:28px 24px;background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius-lg);transition:all .3s;text-align:left;position:relative;overflow:hidden;}
.tool-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--c-primary),var(--c-primary-light));transform:scaleX(0);transform-origin:left;transition:transform .3s;}
.tool-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--c-primary-light);color:var(--c-text);}
.tool-card:hover::before{transform:scaleX(1);}
.tool-card-icon{font-size:36px;margin-bottom:12px;line-height:1;}
.tool-card h3{font-size:18px;font-weight:700;margin-bottom:8px;color:var(--c-text);}
.tool-card p{font-size:14px;color:var(--c-text-mute);line-height:1.7;margin-bottom:16px;}
.tool-card-go{display:inline-flex;align-items:center;gap:4px;font-size:14px;color:var(--c-primary);font-weight:600;}
.tool-card:hover .tool-card-go{gap:8px;}

/* ====== 按钮 ====== */
.btn,.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 28px;background:var(--c-primary);color:#fff;border-radius:var(--radius);font-size:15px;font-weight:600;transition:all .2s;border:none;cursor:pointer;text-decoration:none;}
.btn:hover,.button:hover{background:var(--c-primary-dark);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow);}
.btn-outline{background:transparent;color:var(--c-primary);border:2px solid var(--c-primary);}
.btn-outline:hover{background:var(--c-primary);color:#fff;}

/* ====== 友链 ====== */
.friend-links{padding:24px 0;border-top:1px solid var(--c-border);margin-top:24px;}
.friend-links h3{font-size:16px;font-weight:700;margin-bottom:16px;color:var(--c-text);}
.fl-list{display:flex;flex-wrap:wrap;gap:12px;}
.fl-list a{padding:8px 18px;background:var(--c-bg-alt);border-radius:var(--radius);font-size:14px;color:var(--c-text-mute);border:1px solid var(--c-border);transition:all .2s;}
.fl-list a:hover{background:var(--c-card);color:var(--c-primary);border-color:var(--c-primary-light);transform:translateY(-1px);}

/* ====== 页脚 ====== */
.site-footer{background:var(--c-bg-alt);border-top:1px solid var(--c-border);padding:32px 0 24px;margin-top:48px;}
.foot-copy{text-align:center;color:var(--c-text-light);font-size:14px;line-height:2;}
.foot-copy p{margin:0;}
.disclaimer{font-size:13px;color:var(--c-text-light);}

/* ====== 404 ====== */
.err404,.error-404{text-align:center;padding:120px 24px;}
.err404 h1{font-size:140px;font-weight:900;background:linear-gradient(135deg,var(--c-primary),var(--c-primary-dark));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1;margin-bottom:16px;}
.err404 h2{font-size:28px;margin-bottom:12px;}
.err404 p{color:var(--c-text-mute);margin-bottom:24px;font-size:16px;}

/* ====== 返回顶部（JS注入） ====== */
.back-top{position:fixed;right:24px;bottom:32px;width:48px;height:48px;border-radius:50%;background:var(--c-primary);color:#fff;display:none;align-items:center;justify-content:center;font-size:20px;box-shadow:var(--shadow);z-index:99;transition:all .2s;cursor:pointer;border:none;}
.back-top:hover{background:var(--c-primary-dark);transform:translateY(-2px);}
.back-top.show{display:flex;}

/* ====== 响应式 ====== */
@media(max-width:768px){
  :root{--header-h:56px;font-size:15px;}
  .wrap{padding:0 16px;}
  .main-nav-wrap{gap:12px;}
  .logo a{font-size:18px;}
  .logo a::before{height:22px;width:6px;}
  .menu-toggle{display:flex;}
  .main-nav{position:fixed;top:var(--header-h);left:0;right:0;background:var(--c-card);border-bottom:1px solid var(--c-border);box-shadow:var(--shadow-lg);max-height:calc(100vh - var(--header-h));overflow-y:auto;transform:translateY(-10px);opacity:0;visibility:hidden;transition:all .25s;padding:16px;}
  .main-nav.open{transform:translateY(0);opacity:1;visibility:visible;}
  .main-nav ul{flex-direction:column;gap:4px;}
  .main-nav a{padding:12px 16px;font-size:16px;border-radius:var(--radius);}
  .hero{padding:32px 0 20px;}
  .hero h1{font-size:28px;}
  .hero p{font-size:15px;}
  .article-meta{padding:12px 16px;gap:12px;font-size:13px;flex-direction:column;align-items:flex-start;}
  .article-cover-cap{padding:12px 16px;font-size:13px;}
  .article-cover-auto .cover-char{font-size:120px;}
  .article-body{font-size:16px;line-height:1.85;}
  .article-body h2{font-size:22px;margin:36px 0 16px;}
  .article-body h3{font-size:18px;margin:28px 0 12px;}
  .article-body p{margin-bottom:18px;}
  .article-body ul li,.article-body ol li{padding-left:24px;padding-bottom:10px;}
  .article-body blockquote{padding:16px 20px;}
  .article-end{padding:20px;margin-top:36px;}
  .tools-section{margin-top:48px;padding-top:32px;}
  .tools-header h2{font-size:24px;}
  .tool-cards{grid-template-columns:1fr;gap:16px;}
  .tool-card{padding:20px;}
  .err404,.error-404{padding:80px 16px;}
  .err404 h1{font-size:96px;}
  .err404 h2{font-size:22px;}
  .fl-list{gap:8px;}
  .fl-list a{padding:6px 12px;font-size:13px;}
  .back-top{right:16px;bottom:24px;width:44px;height:44px;}
}
@media(max-width:480px){
  .hero h1{font-size:24px;}
  .article-body{font-size:15px;}
  .article-body h2{font-size:20px;}
}