/* ============================================================
   fixed.衰减器.中国 —— 原创主题样式（att- 前缀，独立于兄弟站）
   调色：墨蓝近黑 #0E1726 / 信号橙 #FF7A1A / 钢蓝 #4E7CA8
   ============================================================ */
:root{
  --ink:#0E1726;
  --ink-2:#16233a;
  --panel:#13203a;
  --line:#2a3a55;
  --line-soft:#1d2c45;
  --orange:#FF7A1A;
  --orange-d:#e96a08;
  --steel:#4E7CA8;
  --steel-l:#6f9cc4;
  --text:#e8eef6;
  --text-dim:#9fb1c7;
  --text-faint:#7388a3;
  --maxw:1180px;
  --h2-inset:16px;          /* 文章/列表/产品正文 H2 左缘 */
  --nav-h:60px;
  --radius:12px;
  --shadow:0 8px 30px rgba(0,0,0,.28);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(78,124,168,.18), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(255,122,26,.10), transparent 55%),
    var(--ink);
  color:var(--text);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--steel-l);text-decoration:none;}
a:hover{color:var(--orange);}
img{max-width:100%;}
h1,h2,h3,h4{color:#fff;line-height:1.35;font-weight:700;}
h1{font-size:30px;margin:0 0 14px;}
h2{font-size:23px;margin:34px 0 14px;padding-left:var(--h2-inset);position:relative;}
h2::before{content:"";position:absolute;left:0;top:6px;bottom:6px;width:4px;border-radius:2px;
  background:linear-gradient(var(--orange),var(--steel));}
h3{font-size:18px;margin:24px 0 10px;padding-left:var(--h2-inset);}
p{margin:0 0 14px;}
ul,ol{padding-left:34px;margin:0 0 14px;}
li{margin:6px 0;}

/* ---------------- 顶部固定导航 ---------------- */
.att-nav{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:1200;
  background:rgba(14,23,38,.86);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.att-nav .att-nav-inner{
  max-width:var(--maxw);margin:0 auto;height:100%;
  display:flex;align-items:center;gap:22px;padding:0 20px;
}
.att-logo{display:flex;align-items:center;gap:10px;font-weight:800;color:#fff;font-size:17px;white-space:nowrap;}
.att-logo .att-mark{width:26px;height:26px;border-radius:7px;
  background:linear-gradient(135deg,var(--orange),var(--steel));display:inline-block;}
.att-nav .att-menu{display:flex;gap:6px;flex:1;flex-wrap:wrap;}
.att-nav .att-menu a{
  color:var(--text-dim);padding:7px 12px;border-radius:8px;font-size:14px;white-space:nowrap;
}
.att-nav .att-menu a:hover,.att-nav .att-menu a.active{color:#fff;background:var(--ink-2);}
.att-nav-toggle{display:none;background:none;border:1px solid var(--line);color:#fff;
  border-radius:8px;padding:6px 10px;font-size:14px;cursor:pointer;}

/* ---------------- 容器 ---------------- */
.att-container{max-width:var(--maxw);margin:0 auto;padding:0 20px;}
.att-main{padding-top:calc(var(--nav-h) + 26px);min-height:70vh;}

/* ---------------- 面包屑（对齐 H2 左缘） ---------------- */
.att-breadcrumb{
  font-size:13px;color:var(--text-faint);padding:14px 0 14px var(--h2-inset);
  border-bottom:1px solid var(--line-soft);margin-bottom:8px;
}
.att-breadcrumb a{color:var(--text-dim);}
.att-breadcrumb a:hover{color:var(--orange);}
.att-breadcrumb .sep{margin:0 8px;color:var(--text-faint);}
.att-breadcrumb .cur{color:var(--steel-l);}

/* ---------------- 首页 hero ---------------- */
.att-hero{
  position:relative;border:1px solid var(--line);border-radius:18px;
  background:linear-gradient(135deg,rgba(78,124,168,.16),rgba(255,122,26,.07));
  padding:40px 34px;margin:18px 0 26px;overflow:hidden;
}
.att-hero h1{font-size:34px;margin-bottom:12px;}
.att-hero p{color:var(--text-dim);max-width:760px;font-size:16px;}
.att-spec-strip{
  margin-top:22px;display:grid;grid-template-columns:repeat(4,1fr);gap:14px;
}
.att-spec-strip .att-cell{
  background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 16px;
}
.att-spec-strip .att-cell b{display:block;color:var(--orange);font-size:20px;}
.att-spec-strip .att-cell span{color:var(--text-faint);font-size:13px;}
.att-hero-cta{margin-top:24px;display:flex;gap:12px;flex-wrap:wrap;}
.att-btn{display:inline-block;padding:11px 22px;border-radius:10px;border:1px solid var(--line);
  color:#fff;background:var(--ink-2);font-size:14.5px;font-weight:600;cursor:pointer;}
.att-btn:hover{color:#fff;border-color:var(--steel);}
.att-btn-primary{background:linear-gradient(135deg,var(--orange),var(--orange-d));border:none;}
.att-btn-primary:hover{filter:brightness(1.08);}

/* ---------------- 首页区块 ---------------- */
.att-home-section{margin:30px 0;}
.att-section-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;
  border-bottom:1px solid var(--line);padding-bottom:10px;margin-bottom:18px;}
.att-section-head h2{padding-left:0;margin:0;}
.att-section-head h2::before{display:none;}
.att-section-head a{font-size:13px;color:var(--steel-l);}

.att-card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.att-card{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;transition:transform .15s ease,border-color .15s ease;display:flex;flex-direction:column;
}
.att-card:hover{transform:translateY(-3px);border-color:var(--steel);}
.att-card h3{margin:0 0 8px;font-size:17px;}
.att-card h3 a{color:#fff;}
.att-card .att-card-meta{font-size:12px;color:var(--orange);margin-bottom:8px;letter-spacing:.5px;}
.att-card p{color:var(--text-dim);font-size:14px;flex:1;margin:0 0 10px;}
.att-card .att-more{font-size:13px;color:var(--steel-l);}

/* ---------------- 列表/分类页（侧栏在前 → 列序 240px 1fr） ---------------- */
.att-list-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:26px;align-items:start;}
.att-cat-side{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:14px;position:sticky;top:calc(var(--nav-h) + 16px);
}
.att-cat-side summary{font-weight:700;color:#fff;cursor:pointer;list-style:none;padding:4px 0;}
.att-cat-side summary::-webkit-details-marker{display:none;}
.att-cat-side summary::after{content:"▾";float:right;color:var(--steel-l);transition:transform .2s;}
.att-cat-side[open] summary::after{transform:rotate(180deg);}
.att-category-list{list-style:none;margin:10px 0 0;padding:0;}
.att-category-list li{margin:2px 0;}
.att-category-list a{display:block;padding:8px 10px;border-radius:8px;color:var(--text-dim);font-size:14px;}
.att-category-list a:hover,.att-category-list a.active{background:var(--ink-2);color:#fff;}
.att-list-intro{color:var(--text-dim);margin-bottom:18px;}
.att-list-items{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
.att-list-item{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:15px;}
.att-list-item .att-li-meta{font-size:12px;color:var(--orange);margin-bottom:6px;}
.att-list-item h3{font-size:16px;margin:0 0 6px;}
.att-list-item h3 a{color:#fff;}
.att-list-item p{color:var(--text-dim);font-size:13.5px;margin:0;}

/* ---------------- 详情页（内容在前 → 列序 1fr 240px） ---------------- */
.att-article-layout,.att-product-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:30px;align-items:start;}
.att-content-main,.att-product-main{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 28px;min-width:0;
}
.att-toc-aside{
  position:sticky;top:calc(var(--nav-h) + 16px);max-height:calc(100vh - 100px);overflow-y:auto;
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:14px;
}
.att-toc-aside summary{font-weight:700;color:#fff;cursor:pointer;list-style:none;padding:4px 0;}
.att-toc-aside summary::-webkit-details-marker{display:none;}
.att-toc-aside summary::after{content:"▾";float:right;color:var(--steel-l);transition:transform .2s;}
.att-toc-aside[open] summary::after{transform:rotate(180deg);}
.att-toc-aside ol{list-style:none;margin:10px 0 0;padding:0;}
.att-toc-aside li{margin:2px 0;font-size:13.5px;}
.att-toc-aside li a{display:block;padding:5px 8px;border-radius:7px;color:var(--text-dim);}
.att-toc-aside li a:hover{background:var(--ink-2);color:#fff;}

/* 摘要块 / 关键词 / 结论 / 实践经验 */
.att-abstract{background:var(--ink-2);border-left:4px solid var(--orange);border-radius:0 10px 10px 0;
  padding:14px 18px;margin:0 0 18px;color:var(--text);}
.att-keywords{font-size:13.5px;color:var(--text-dim);margin-bottom:18px;}
.att-keywords b{color:var(--steel-l);}
.att-update{font-size:13px;color:var(--text-faint);margin:0 0 18px;}
.att-conclusion{background:rgba(78,124,168,.12);border:1px solid var(--line);border-radius:10px;
  padding:14px 18px;margin:22px 0;}
.att-conclusion h3{padding-left:0;margin:0 0 8px;color:var(--orange);}
.att-conclusion li{color:var(--text);}
.att-callout{background:rgba(255,122,26,.10);border:1px solid var(--orange);border-radius:10px;
  padding:14px 18px;margin:22px 0;}
.att-callout b{color:var(--orange);}

/* 标签 / 相关阅读 */
.att-tag-row{margin:22px 0 6px;}
.att-tag-row .tag-text{display:inline-block;background:var(--ink-2);border:1px solid var(--line);
  color:var(--text-dim);border-radius:999px;padding:3px 12px;font-size:12.5px;margin:0 6px 6px 0;}
.att-related{background:var(--ink-2);border:1px solid var(--line);border-radius:10px;padding:16px 18px;margin:22px 0;}
.att-related h3{padding-left:0;margin:0 0 10px;color:var(--steel-l);}
.att-related li{margin:8px 0;}
.att-related a{color:var(--steel-l);}

/* ---------------- 表格（覆盖全部正文 table，含 Markdown 裸表） ---------------- */
.att-content-main table,.att-product-main table,table.att-spec{
  width:100%;border-collapse:collapse;margin:18px 0;font-size:14px;
  border:1px solid #cbd5e1;
}
.att-content-main table th,.att-product-main table th,table.att-spec th{
  background:var(--steel);color:#fff;border:1px solid #cbd5e1;padding:9px 12px;text-align:left;font-weight:600;
}
.att-content-main table td,.att-product-main table td,table.att-spec td{
  border:1px solid #cbd5e1;padding:8px 12px;color:var(--text);
}
.att-content-main table tbody tr:nth-child(even),.att-product-main table tbody tr:nth-child(even),
table.att-spec tbody tr:nth-child(even){background:rgba(255,255,255,.04);}

/* 引用 / 代码 */
.att-content-main blockquote,.att-product-main blockquote,.att-page-main blockquote{
  border-left:4px solid var(--steel);background:var(--ink-2);margin:16px 0;padding:10px 16px;color:var(--text-dim);
}
.att-content-main code,.att-product-main code,.att-page-main code{
  background:var(--ink-2);padding:2px 6px;border-radius:5px;color:var(--orange);font-size:13.5px;
}

/* FAQ（裸 details） */
.att-content-main details,.att-product-main details,.att-page-main details{
  border:1px solid var(--line);border-radius:10px;margin:10px 0;padding:0 16px;background:var(--ink-2);
}
.att-content-main details summary,.att-product-main details summary,.att-page-main details summary{
  cursor:pointer;padding:12px 0;font-weight:600;color:#fff;list-style:none;
}
.att-content-main details summary::-webkit-details-marker,.att-product-main details summary::-webkit-details-marker,
.att-page-main details summary::-webkit-details-marker{display:none;}
.att-content-main details summary::before,.att-product-main details summary::before,
.att-page-main details summary::before{content:"＋";color:var(--orange);margin-right:10px;font-weight:700;}
.att-content-main details[open] summary::before,.att-product-main details[open] summary::before,
.att-page-main details[open] summary::before{content:"－";}
.att-content-main details p,.att-product-main details p,.att-page-main details p{color:var(--text-dim);}

/* ---------------- 页面（about/contact 等） ---------------- */
.att-page-wrap{max-width:880px;margin:0 auto;}
.att-page-main{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 34px;--h2-inset:48px;}
.att-page-main h2{padding-left:48px;}
.att-page-main h2::before{left:32px;}
.att-page-main .att-contact-box{background:var(--ink-2);border:1px solid var(--line);border-radius:10px;
  padding:16px 20px;margin:18px 0;}

/* ---------------- 悬浮胶囊 ---------------- */
.att-float{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:1100;
  display:flex;flex-direction:column;gap:10px;}
.att-float button,.att-float a{
  width:54px;height:54px;border-radius:27px;border:none;cursor:pointer;
  background:linear-gradient(135deg,var(--orange),var(--orange-d));color:#fff;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  font-size:10px;line-height:1.2;box-shadow:var(--shadow);text-decoration:none;
}
.att-float button:hover,.att-float a:hover{filter:brightness(1.08);}
.att-float .att-ic{font-size:18px;line-height:1;}

/* 名片弹层 */
.att-card-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:1300;
  display:flex;align-items:center;justify-content:center;}
.att-card-overlay[hidden]{display:none;}
.att-card-overlay img{max-width:90vw;max-height:90vh;border-radius:10px;box-shadow:var(--shadow);}
.att-card-overlay .att-close{position:absolute;top:18px;right:24px;color:#fff;font-size:30px;cursor:pointer;}

/* ---------------- 页脚 ---------------- */
.att-footer{border-top:1px solid var(--line);margin-top:40px;padding:26px 0;color:var(--text-faint);font-size:13px;}
.att-footer .att-container{display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px;}
.att-footer a{color:var(--text-dim);margin-right:14px;}

/* ---------------- 404 / 归档 ---------------- */
.att-archive-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;}
.att-archive-item{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px;}
.att-archive-item h3{font-size:16px;margin:0 0 6px;}
.att-archive-item h3 a{color:#fff;}
.att-404{text-align:center;padding:80px 20px;}
.att-404 h1{font-size:64px;color:var(--orange);}

/* ---------------- 响应式（断点 1024，与 JS matchMedia 一致） ---------------- */
@media (max-width:1024px){
  .att-nav .att-menu{display:none;}
  .att-nav .att-nav-toggle{display:block;}
  .att-nav .att-menu.att-open{display:flex;position:absolute;top:var(--nav-h);left:0;right:0;
    flex-direction:column;background:var(--ink);padding:10px 20px;border-bottom:1px solid var(--line);}
  .att-hero{padding:28px 20px;}
  .att-spec-strip{grid-template-columns:repeat(2,1fr);}
  .att-card-grid{grid-template-columns:1fr 1fr;}
  /* 列表页与详情页统一折叠为单列；目录/侧栏降级为可点击折叠面板，禁止 display:none 隐藏 */
  .att-list-layout{grid-template-columns:1fr;}
  .att-article-layout,.att-product-layout{grid-template-columns:1fr;}
  .att-cat-side{position:static;}
  .att-toc-aside{position:static;max-height:none;}
  .att-list-items{grid-template-columns:1fr;}
}
@media (max-width:640px){
  .att-spec-strip{grid-template-columns:1fr;}
  .att-card-grid{grid-template-columns:1fr;}
  .att-archive-grid{grid-template-columns:1fr;}
  h1{font-size:25px;}
  .att-hero h1{font-size:26px;}
}