/* ===================== 基础重置 ===================== */
*,*::before,*::after{box-sizing:border-box}
:root{
  --ink:#141827;
  --ink-2:#3a4055;
  --muted:#7c839b;
  --line:rgba(20,24,39,.08);
  --brand-1:#6a11cb;
  --brand-2:#2575fc;
  --shadow-sm:0 2px 10px rgba(20,24,39,.05);
  --shadow-md:0 12px 34px rgba(20,24,39,.10);
}
html{scroll-behavior:smooth;scroll-padding-top:86px}
body{
  margin:0;
  overflow-x:hidden;
  color:var(--ink);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  background:
    radial-gradient(1200px 620px at 8% -12%, rgba(106,17,203,.10), transparent 62%),
    radial-gradient(1000px 600px at 100% 0%, rgba(37,117,252,.10), transparent 58%),
    linear-gradient(180deg,#ffffff 0%,#f7f8fc 45%,#edf0f9 100%);
  background-attachment:fixed;
}
img{max-width:100%}
a{color:inherit}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* ===================== 顶部导航 ===================== */
.site-header{
  position:sticky;top:0;z-index:100;
  background:linear-gradient(120deg,#141b34 0%,#1c2450 45%,#2a1a4d 100%);
  box-shadow:0 8px 28px rgba(11,15,33,.30);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:20px;height:70px;
}
.logo{
  display:flex;align-items:center;gap:11px;
  text-decoration:none;flex:0 0 auto;
}
.logo-mark{
  position:relative;width:32px;height:32px;border-radius:10px;
  background:linear-gradient(135deg,#7b5bff,#00d4ff);
  box-shadow:0 0 18px rgba(123,91,255,.65);
}
.logo-mark::after{
  content:"";position:absolute;inset:9px;border-radius:3px;background:#fff;
}
.logo-text{
  font-size:19px;font-weight:800;letter-spacing:2px;
  background:linear-gradient(90deg,#ffffff,#c9d8ff);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.main-nav ul{
  list-style:none;display:flex;align-items:center;gap:6px;
  margin:0;padding:0;
}
.main-nav a{
  display:block;padding:8px 14px;border-radius:10px;
  font-size:14.5px;font-weight:500;white-space:nowrap;
  color:rgba(255,255,255,.76);text-decoration:none;
  transition:color .25s,background .25s,box-shadow .25s;
}
.main-nav a:hover{color:#fff;background:rgba(255,255,255,.10)}
.main-nav a.active{
  color:#fff;
  background:linear-gradient(135deg,#6a11cb,#2575fc);
  box-shadow:0 6px 16px rgba(106,17,203,.45);
}
.nav-toggle{
  display:none;
  width:42px;height:42px;padding:0;
  flex-direction:column;align-items:center;justify-content:center;gap:5px;
  border-radius:12px;cursor:pointer;
  background:rgba(255,255,255,.10);
  border:1px solid rgba(255,255,255,.18);
  transition:background .25s;
}
.nav-toggle:hover{background:rgba(255,255,255,.18)}
.nav-toggle span{
  display:block;width:20px;height:2px;border-radius:2px;
  background:#fff;transition:transform .3s,opacity .3s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===================== 面包屑 ===================== */
.breadcrumb{padding-top:24px}
.crumb-list{
  list-style:none;display:flex;flex-wrap:wrap;align-items:center;
  gap:8px;margin:0;padding:0;
  font-size:13.5px;letter-spacing:.4px;color:var(--muted);
}
.crumb-list li{display:flex;align-items:center;min-width:0}
.crumb-list li+li::before{
  content:"/";margin-right:8px;color:#c4cadb;
}
.crumb-list a{text-decoration:none;color:#5b6280;transition:color .2s}
.crumb-list a:hover{color:var(--brand-1)}
.crumb-list .current{
  color:var(--ink);font-weight:600;
  overflow-wrap:anywhere;word-break:break-word;
}

/* ===================== 布局 ===================== */
.layout{
  display:grid;
  grid-template-columns:minmax(0,1fr) 344px;
  gap:28px;
  align-items:start;
  padding-top:26px;
}
.col-main{min-width:0}
.col-side{min-width:0;display:flex;flex-direction:column;gap:22px}

/* ===================== 文章头部 ===================== */
.article-hero{
  display:flex;gap:22px;align-items:flex-start;
  padding:20px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:20px;
  box-shadow:var(--shadow-sm);
}
.article-hero-thumb{
  flex:0 0 300px;
  border-radius:16px;
  overflow:hidden;
  background:linear-gradient(135deg,#e9edf7,#dfe6f5);
}
.article-hero-thumb img{
  display:block;width:100%;height:100%;
  aspect-ratio:4/3;
  object-fit:cover;
}
.article-hero-body{
  flex:1 1 auto;min-width:0;
}
.article-h1{
  margin:0 0 14px;
  font-size:clamp(20px,2.6vw,29px);
  font-weight:800;
  line-height:1.42;
  letter-spacing:.5px;
  color:#1b2033;
  overflow-wrap:anywhere;
  word-break:break-word;
}
.article-info{
  display:flex;flex-direction:column;gap:8px;
}
.article-info-item{
  display:flex;align-items:center;gap:9px;
  font-size:13.5px;letter-spacing:.4px;color:#7c839b;
}
.article-info-item::before{
  content:"";flex:0 0 auto;
  width:8px;height:8px;border-radius:50%;
  background:linear-gradient(135deg,var(--brand-1),var(--brand-2));
  box-shadow:0 2px 6px rgba(106,17,203,.35);
}
.article-info-item.is-date::before{
  background:linear-gradient(135deg,#2575fc,#00d4ff);
  box-shadow:0 2px 6px rgba(37,117,252,.30);
}
.article-info-item.is-read::before{
  background:linear-gradient(135deg,#ff5f6d,#ffc371);
  box-shadow:0 2px 6px rgba(255,95,109,.30);
}

/* ===================== 文章正文 ===================== */
.article-content{
  margin-top:24px;
  padding:26px 28px 30px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:20px;
  box-shadow:var(--shadow-sm);
  font-size:15.5px;
  line-height:1.9;
  color:#333a4f;
  overflow-wrap:anywhere;
  word-break:break-word;
}
.article-content>*:first-child{margin-top:0}
.article-content>*:last-child{margin-bottom:0}
.article-content p{margin:0 0 18px}
.article-content h2{
  position:relative;
  margin:34px 0 16px;
  padding-left:16px;
  font-size:20px;font-weight:800;letter-spacing:.8px;
  line-height:1.5;
  color:#1b2033;
  overflow-wrap:anywhere;word-break:break-word;
}
.article-content h2::before{
  content:"";position:absolute;left:0;top:50%;
  width:5px;height:20px;border-radius:3px;
  transform:translateY(-50%);
  background:linear-gradient(180deg,#6a11cb,#2575fc);
}
.article-content h3{
  position:relative;
  margin:26px 0 12px;
  padding-left:14px;
  font-size:17px;font-weight:700;letter-spacing:.5px;
  line-height:1.55;
  color:#242b41;
  overflow-wrap:anywhere;word-break:break-word;
}
.article-content h3::before{
  content:"";position:absolute;left:0;top:50%;
  width:4px;height:15px;border-radius:2px;
  transform:translateY(-50%);
  background:linear-gradient(180deg,#00b09b,#2575fc);
}
.article-content strong{color:#1b2033;font-weight:700}
.article-content img{
  display:block;
  max-width:100%;height:auto;
  margin:22px auto;
  border-radius:16px;
  box-shadow:0 10px 26px rgba(20,24,39,.10);
}
.article-content ul{
  list-style:none;
  margin:0 0 18px;
  padding:0;
  counter-reset:bodyli;
}
.article-content ul li{
  counter-increment:bodyli;
  position:relative;
  padding-left:36px;
  margin:10px 0;
  overflow-wrap:anywhere;
  word-break:break-word;
}
.article-content ul li::before{
  content:counter(bodyli)".";
  position:absolute;left:0;top:0;
  display:inline-flex;align-items:center;justify-content:center;
  width:24px;height:24px;
  border-radius:8px;
  font-size:12.5px;font-weight:800;
  font-variant-numeric:tabular-nums;
  color:#fff;
  background:linear-gradient(135deg,var(--brand-1),var(--brand-2));
}

/* ===== 正文表格：外框清晰包裹，单元格独立分隔，超宽自动换行 ===== */
.article-content table{
  width:100%;
  table-layout:fixed;
  border-collapse:collapse;
  border-spacing:0;
  margin:22px 0;
  font-size:14px;
  line-height:1.7;
  /* 外框：明显且完整闭合 */
  border:2px solid #8e9dc4;
}
.article-content thead th{
  background:linear-gradient(180deg,#f5f7fd,#eef2fb);
  font-weight:800;
  color:#242b41;
  letter-spacing:.4px;
  /* 表头下方分隔线略深，与外框呼应 */
  border-bottom:2px solid #8e9dc4;
}
.article-content th,
.article-content td{
  /* 单元格之间清晰分隔 */
  border:1px solid #cdd6ea;
  padding:10px 13px;
  text-align:left;
  vertical-align:top;
  white-space:normal;
  overflow-wrap:anywhere;
  word-break:break-word;
}
.article-content tbody tr:nth-child(even){background:#fbfcff}
.article-content tbody tr:hover{background:#f4f7ff}

/* ===================== 上下篇 ===================== */
.post-nav{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:16px;
  margin-top:26px;
}
.post-nav a{
  position:relative;
  display:block;
  padding:16px 18px;
  min-width:0;
  background:#fff;
  border:1px solid var(--line);
  border-radius:18px;
  box-shadow:var(--shadow-sm);
  text-decoration:none;
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.post-nav a:hover{
  transform:translateY(-3px);
  box-shadow:var(--shadow-md);
  border-color:rgba(106,17,203,.22);
}
.post-nav .nav-label{
  display:flex;align-items:center;gap:8px;
  margin-bottom:6px;
  font-size:12.5px;font-weight:700;letter-spacing:1px;
  color:#8b92a8;
}
.post-nav .prev .nav-label::before{
  content:"←";
  font-size:14px;font-weight:800;
  color:var(--brand-1);
}
.post-nav .next{
  text-align:right;
}
.post-nav .next .nav-label{
  justify-content:flex-end;
}
.post-nav .next .nav-label::after{
  content:"→";
  font-size:14px;font-weight:800;
  color:var(--brand-1);
}
.post-nav .nav-title{
  display:block;
  font-size:14.5px;font-weight:600;line-height:1.55;
  color:#1b2033;
  overflow-wrap:anywhere;word-break:break-word;
  transition:color .2s;
}
.post-nav a:hover .nav-title{color:var(--brand-1)}

/* ===================== 相关文章 ===================== */
.related{
  margin-top:26px;
  padding:24px 20px 20px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:20px;
  box-shadow:var(--shadow-sm);
}
.related-head{
  display:flex;align-items:center;gap:12px;
  margin:0 0 16px;
  font-size:17px;font-weight:800;letter-spacing:1.2px;
  color:#7b2ff7;
}
.related-head::after{
  content:"";flex:1 1 auto;height:1px;
  background:linear-gradient(90deg,rgba(20,24,39,.12),transparent);
}
.related-list{
  list-style:none;margin:0;padding:0;
  counter-reset:relidx;
  display:flex;flex-direction:column;gap:8px;
}
.related-item{
  counter-increment:relidx;
  display:flex;align-items:flex-start;gap:10px;
  min-width:0;
  padding:10px 12px;
  border-radius:12px;
  background:#fbfcfe;
  border:1px solid rgba(20,24,39,.05);
  transition:background .22s,border-color .22s,box-shadow .22s;
}
.related-item:hover{
  background:#fff;
  border-color:rgba(123,47,247,.22);
  box-shadow:0 8px 18px rgba(20,24,39,.07);
}
.related-item::before{
  content:counter(relidx,decimal-leading-zero);
  flex:0 0 auto;
  width:26px;height:26px;
  display:flex;align-items:center;justify-content:center;
  border-radius:9px;
  font-size:11.5px;font-weight:800;letter-spacing:.3px;
  font-variant-numeric:tabular-nums;
  color:#fff;
  background:linear-gradient(135deg,#e91e63,#7b2ff7);
}
.related-link{
  display:block;flex:1 1 auto;min-width:0;
  text-decoration:none;
}
.related-title{
  display:block;
  font-size:14px;font-weight:600;line-height:1.5;
  color:#1b2033;
  overflow-wrap:anywhere;word-break:break-word;
  transition:color .2s;
}
.related-link:hover .related-title{color:#7b2ff7}
.related-meta{
  display:block;margin-top:4px;
  font-size:12px;letter-spacing:.3px;color:#9299ad;
}

/* ===================== 侧栏面板 ===================== */
.panel{
  padding:20px 18px 18px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:20px;
  box-shadow:var(--shadow-sm);
}
.panel-head{
  display:flex;align-items:center;gap:12px;
  margin:0 0 14px;
  font-size:16px;font-weight:800;letter-spacing:1.2px;
  color:var(--panel-accent,var(--brand-1));
}
.panel-head::after{
  content:"";flex:1 1 auto;height:1px;
  background:linear-gradient(90deg,rgba(20,24,39,.12),transparent);
}
.panel--new{--panel-accent:#2575fc}
.panel--hot{--panel-accent:#ff4d5e}
.panel--rec{--panel-accent:#00997f}
.panel--like{--panel-accent:#7b2ff7}

.side-list{
  list-style:none;margin:0;padding:0;
  counter-reset:sideidx;
  display:flex;flex-direction:column;gap:8px;
}
.side-item{
  counter-increment:sideidx;
  display:flex;align-items:flex-start;gap:10px;
  min-width:0;
  padding:9px 11px;
  border-radius:12px;
  background:#fbfcfe;
  border:1px solid rgba(20,24,39,.05);
  transition:background .22s,border-color .22s,box-shadow .22s;
}
.side-item:hover{
  background:#fff;
  border-color:rgba(106,17,203,.20);
  box-shadow:0 8px 18px rgba(20,24,39,.07);
}
.side-item::before{
  content:counter(sideidx,decimal-leading-zero);
  flex:0 0 auto;
  width:26px;height:26px;
  display:flex;align-items:center;justify-content:center;
  border-radius:9px;
  font-size:11.5px;font-weight:800;letter-spacing:.3px;
  font-variant-numeric:tabular-nums;
  color:#fff;
  background:linear-gradient(135deg,var(--brand-1),var(--brand-2));
}
.panel--new .side-item::before{background:linear-gradient(135deg,#2575fc,#00d4ff)}
.panel--hot .side-item::before{background:linear-gradient(135deg,#ff5f6d,#ffc371)}
.panel--rec .side-item::before{background:linear-gradient(135deg,#00b09b,#2575fc)}
.panel--like .side-item::before{background:linear-gradient(135deg,#e91e63,#7b2ff7)}

.side-link{
  display:block;flex:1 1 auto;min-width:0;
  text-decoration:none;
}
.side-title{
  display:block;
  font-size:14px;font-weight:600;line-height:1.5;
  color:#1b2033;
  overflow-wrap:anywhere;word-break:break-word;
  transition:color .2s;
}
.side-link:hover .side-title{color:var(--panel-accent,var(--brand-1))}
.side-meta{
  display:block;margin-top:4px;
  font-size:12px;letter-spacing:.3px;color:#9299ad;
}

/* ===================== 页脚 ===================== */
.site-footer{
  margin-top:72px;
  padding:36px 0;
  color:rgba(255,255,255,.66);
  background:linear-gradient(120deg,#141b34 0%,#1c2450 50%,#2a1a4d 100%);
}
.footer-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:14px;
}
.footer-brand{margin:0;font-size:13.5px;letter-spacing:.5px}
.footer-brand a{
  color:#7fd4ff;font-weight:700;text-decoration:none;
  border-bottom:1px solid rgba(127,212,255,.45);
  transition:color .25s,border-color .25s;
}
.footer-brand a:hover{color:#fff;border-color:#fff}
.footer-links{display:flex;flex-wrap:wrap;gap:18px;margin:0}
.footer-links a{
  font-size:13.5px;text-decoration:none;color:rgba(255,255,255,.62);
  transition:color .25s;
}
.footer-links a:hover{color:#fff}

/* ===================== 响应式 ===================== */
@media (max-width:1100px){
  .layout{grid-template-columns:minmax(0,1fr) 300px;gap:22px}
  .article-hero-thumb{flex-basis:250px}
}
@media (max-width:980px){
  .layout{grid-template-columns:minmax(0,1fr)}
  .col-side{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:18px;
  }
  .article-hero-thumb{flex-basis:280px}
}
@media (max-width:860px){
  .nav-toggle{display:flex}
  .main-nav{
    position:absolute;left:0;right:0;top:70px;
    display:none;
    padding:12px 20px 20px;
    background:linear-gradient(150deg,#1b2347,#2a1a4d);
    border-top:1px solid rgba(255,255,255,.08);
    box-shadow:0 22px 40px rgba(8,12,28,.45);
  }
  .main-nav.open{display:block}
  .main-nav ul{flex-direction:column;align-items:stretch;gap:4px}
  .main-nav a{padding:11px 14px;font-size:15px;border-radius:12px}

  .breadcrumb{padding-top:18px}
  .layout{padding-top:20px}
  .article-content{padding:22px 20px 24px;font-size:15px}
  .site-footer{margin-top:52px;padding:28px 0}
  .footer-inner{flex-direction:column;align-items:flex-start;gap:12px}
}
@media (max-width:768px){
  .article-hero{flex-direction:column;gap:16px}
  .article-hero-thumb{flex-basis:auto;width:100%}
  .article-hero-thumb img{aspect-ratio:16/10;height:auto}
  .post-nav{grid-template-columns:minmax(0,1fr)}
  .post-nav .next{text-align:left}
  .post-nav .next .nav-label{justify-content:flex-start}
  .post-nav .next .nav-label::after{content:""}
  .post-nav .next .nav-label::before{
    content:"→";
    font-size:14px;font-weight:800;color:var(--brand-1);
  }
  .article-content table{font-size:13px}
  .article-content th,.article-content td{padding:9px 10px}
}
@media (max-width:640px){
  .col-side{grid-template-columns:minmax(0,1fr);gap:16px}
  .article-content{padding:20px 16px 22px;font-size:14.6px}
  .article-content h2{font-size:18px}
  .article-content h3{font-size:16px}
  .article-content ul li{padding-left:32px}
  .article-content ul li::before{width:22px;height:22px;font-size:11.5px}
  .related{padding:20px 16px 16px}
  .panel{padding:18px 15px 15px}
}
@media (max-width:480px){
  .article-info-item{font-size:12.8px}
  .article-content table{font-size:12.4px}
  .article-content th,.article-content td{padding:8px 9px}
  .post-nav a{padding:14px 15px}
}