/* ========== Reset & Variables ========== */
  *,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
  :root{
    --blue-900:#0a1628;--blue-800:#0d2240;--blue-700:#0f3460;--blue-600:#165a9c;
    --blue-500:#1a73e8;--blue-400:#4a90e2;--blue-300:#7ab8f5;--blue-200:#a8d4ff;
    --blue-100:#d6eaff;--blue-50:#eef5fc;--accent:#00c9db;--gold:#f0a500;
    --white:#ffffff;--gray-50:#f8fafc;--gray-100:#f1f5f9;--gray-200:#e2e8f0;
    --gray-300:#cbd5e1;--gray-400:#94a3b8;--gray-500:#64748b;--gray-600:#475569;
    --gray-700:#334155;--gray-800:#1e293b;--gray-900:#0f172a;
    --radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:24px;
    --shadow-sm:0 1px 3px rgba(0,0,0,.08);--shadow-md:0 4px 16px rgba(0,0,0,.1);
    --shadow-lg:0 8px 32px rgba(0,0,0,.12);--shadow-xl:0 16px 48px rgba(13,34,64,.15);
    --transition:all .3s cubic-bezier(.4,0,.2,1);--max-width:1200px;
  }
  html{scroll-behavior:smooth;font-size:16px}
  body{
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
    color:var(--gray-800);background:var(--gray-50);line-height:1.7;
    overflow-x:hidden;-webkit-font-smoothing:antialiased;
  }
  a{text-decoration:none;color:inherit}ul{list-style:none}img{max-width:100%;height:auto}
  .container{max-width:var(--max-width);margin:0 auto;padding:0 20px}

  /* ========== Article Header ========== */
  .article-header{
    background:linear-gradient(160deg,var(--blue-900),var(--blue-700));
    padding:60px 20px 50px;text-align:center;position:relative;overflow:hidden;
  }
  .article-header::before{
    content:'';position:absolute;inset:0;
    background:radial-gradient(ellipse at 30% 50%,rgba(0,201,219,.08),transparent 60%),
               radial-gradient(ellipse at 70% 30%,rgba(26,115,232,.1),transparent 60%);
  }
  .article-header .container{position:relative;z-index:1}
  .article-breadcrumb{
    display:flex;align-items:center;justify-content:center;gap:8px;
    font-size:.85rem;color:rgba(255,255,255,.5);margin-bottom:20px;
  }
  .article-breadcrumb a{color:rgba(255,255,255,.7);transition:var(--transition)}
  .article-breadcrumb a:hover{color:var(--accent)}
  .article-header .ah-tag{
    display:inline-block;background:var(--blue-500);color:var(--white);
    padding:5px 18px;border-radius:20px;font-size:.8rem;font-weight:600;margin-bottom:18px;
  }
  .article-header h1{
    font-size:clamp(1.5rem,4vw,2.2rem);font-weight:800;color:var(--white);
    line-height:1.45;max-width:800px;margin:0 auto 20px;
  }
  .article-meta{
    display:flex;align-items:center;justify-content:center;gap:24px;
    font-size:.9rem;color:rgba(255,255,255,.6);flex-wrap:wrap;
  }
  .article-meta span{display:flex;align-items:center;gap:6px}

  /* ========== Article Layout ========== */
  .article-layout{padding:50px 0 70px}
  .article-grid{display:grid;grid-template-columns:1fr 320px;gap:50px;align-items:start}

  /* ========== Article Content ========== */
  .article-main{background:var(--white);border-radius:var(--radius-lg);padding:40px;
    box-shadow:var(--shadow-sm);border:1px solid var(--gray-200);
  }
  .article-featured-img{
    margin:-40px -40px 36px;border-radius:var(--radius-lg) var(--radius-lg) 0 0;overflow:hidden;
    background:linear-gradient(135deg,var(--blue-700),var(--blue-500));
    min-height:360px;display:flex;align-items:center;justify-content:center;
    font-size:6rem;color:rgba(255,255,255,.25);
  }
  .article-summary{
    background:var(--blue-50);border-left:4px solid var(--blue-500);
    padding:20px 24px;border-radius:0 var(--radius-md) var(--radius-md) 0;
    margin-bottom:30px;font-size:1.02rem;color:var(--gray-700);
    font-weight:500;line-height:1.75;
  }
  .article-main h2{
    font-size:1.4rem;font-weight:700;color:var(--gray-900);
    margin:36px 0 16px;padding-left:16px;border-left:3px solid var(--blue-500);
  }
  .article-main h3{
    font-size:1.15rem;font-weight:700;color:var(--gray-800);margin:28px 0 12px;
  }
  .article-main p{
    font-size:1rem;color:var(--gray-600);line-height:1.9;margin-bottom:18px;
  }
  .article-main ul,.article-main ol{margin:0 0 20px 24px}
  .article-main li{
    font-size:1rem;color:var(--gray-600);line-height:1.9;margin-bottom:6px;padding-left:4px;
  }
  .article-main li::marker{color:var(--blue-500)}
  .article-highlight{
    background:linear-gradient(135deg,var(--blue-50),rgba(0,201,219,.06));
    border-radius:var(--radius-lg);padding:28px 32px;margin:28px 0;position:relative;
  }
  .article-highlight::before{
    content:'\201C';position:absolute;top:-10px;left:20px;
    font-size:4rem;color:var(--blue-200);font-family:Georgia,serif;line-height:1;
  }
  .article-highlight p{font-size:1.06rem;font-weight:500;color:var(--gray-700);font-style:italic;margin:0}

  /* ========== Article Footer ========== */
  .article-tags{
    display:flex;align-items:center;gap:10px;flex-wrap:wrap;
    margin-top:36px;padding-top:24px;border-top:1px solid var(--gray-200);
  }
  .article-tags span{font-size:.85rem;color:var(--gray-400);font-weight:500}
  .article-tags a{
    display:inline-block;padding:4px 14px;background:var(--gray-100);
    border-radius:20px;font-size:.8rem;color:var(--gray-600);
    transition:var(--transition);
  }
  .article-tags a:hover{background:var(--blue-50);color:var(--blue-500)}
  .article-share{
    display:flex;align-items:center;justify-content:space-between;
    margin-top:24px;padding-top:24px;border-top:1px solid var(--gray-200);
    flex-wrap:wrap;gap:16px;
  }
  .article-share .share-label{font-size:.85rem;color:var(--gray-400);font-weight:500}
  .share-btns{display:flex;gap:8px}
  .share-btn{
    width:38px;height:38px;border-radius:50%;border:1px solid var(--gray-200);
    display:flex;align-items:center;justify-content:center;
    font-size:.95rem;cursor:pointer;transition:var(--transition);background:var(--white);
  }
  .share-btn:hover{background:var(--blue-500);border-color:var(--blue-500);color:var(--white)}
  .prev-next-nav{display:flex;align-items:center;justify-content:space-between;margin-top:28px}
  .prev-next-nav a{
    display:flex;align-items:center;gap:8px;font-size:.9rem;color:var(--gray-500);
    padding:10px 18px;border-radius:50px;border:1px solid var(--gray-200);
    transition:var(--transition);font-weight:500;
  }
  .prev-next-nav a:hover{color:var(--blue-500);border-color:var(--blue-300);background:var(--blue-50)}

  /* ========== Sidebar ========== */
  .sidebar{display:flex;flex-direction:column;gap:28px;position:sticky;top:90px}
  .sidebar-card{
    background:var(--white);border-radius:var(--radius-lg);padding:24px;
    box-shadow:var(--shadow-sm);border:1px solid var(--gray-200);
  }
  .sidebar-card h4{
    font-size:1rem;font-weight:700;color:var(--gray-900);
    margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--blue-100);
    display:flex;align-items:center;gap:8px;
  }
  .sidebar-card h4::before{
    content:'';width:4px;height:18px;background:var(--blue-500);border-radius:2px;
  }
  .hot-list{display:flex;flex-direction:column;gap:14px}
  .hot-item{display:flex;gap:12px;align-items:flex-start}
  .hot-item .hot-rank{
    flex-shrink:0;width:22px;height:22px;border-radius:6px;
    display:flex;align-items:center;justify-content:center;
    font-size:.75rem;font-weight:800;color:var(--white);
  }
  .hot-rank.r1{background:linear-gradient(135deg,#e53935,#ef5350)}
  .hot-rank.r2{background:linear-gradient(135deg,#fb8c00,#ffa726)}
  .hot-rank.r3{background:linear-gradient(135deg,#fdd835,#ffee58);color:var(--gray-700)}
  .hot-rank.rn{background:var(--gray-200);color:var(--gray-500)}
  .hot-item .hot-info h5{
    font-size:.88rem;font-weight:600;color:var(--gray-800);line-height:1.5;
    transition:var(--transition);margin-bottom:4px;
  }
  .hot-item .hot-info h5:hover{color:var(--blue-500)}
  .hot-item .hot-info span{font-size:.78rem;color:var(--gray-400)}

  .tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
  .tag-cloud a{
    padding:6px 14px;background:var(--gray-50);border:1px solid var(--gray-200);
    border-radius:20px;font-size:.8rem;color:var(--gray-600);transition:var(--transition);
  }
  .tag-cloud a:hover{background:var(--blue-500);color:var(--white);border-color:var(--blue-500)}

  /* ========== Related Articles ========== */
  .related-section{padding:0 0 70px}
  .section-header{
    display:flex;align-items:center;justify-content:space-between;margin-bottom:30px;
  }
  .section-header h3{
    font-size:1.35rem;font-weight:800;color:var(--gray-900);
    padding-left:16px;border-left:3px solid var(--blue-500);
  }
  .section-header a{font-size:.9rem;color:var(--blue-500);font-weight:600;transition:var(--transition)}
  .section-header a:hover{color:var(--blue-600)}
  .related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
  .related-card{
    background:var(--white);border-radius:var(--radius-lg);overflow:hidden;
    box-shadow:var(--shadow-sm);transition:var(--transition);border:1px solid var(--gray-200);
  }
  .related-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-3px)}
  .related-card .rc-img{
    height:160px;background:linear-gradient(135deg,var(--blue-100),var(--blue-200));
    display:flex;align-items:center;justify-content:center;font-size:2.5rem;color:var(--blue-300);
  }
  .related-card .rc-body{padding:18px}
  .related-card .rc-body span{font-size:.78rem;color:var(--gray-400)}
  .related-card .rc-body h5{
    font-size:.95rem;font-weight:700;color:var(--gray-800);
    margin:6px 0 8px;line-height:1.5;transition:var(--transition);
  }
  .related-card .rc-body h5:hover{color:var(--blue-500)}

  /* ========== Responsive ========== */
  @media (max-width: 1024px){
    .article-grid{grid-template-columns:1fr;gap:40px}
    .sidebar{position:static;flex-direction:row;flex-wrap:wrap}
    .sidebar-card{flex:1;min-width:260px}
    .related-grid{grid-template-columns:repeat(2,1fr)}
    .footer-grid{grid-template-columns:1fr 1fr}
  }
  @media (max-width: 768px){
    .nav-links{
      position:fixed;top:68px;left:0;right:0;bottom:0;background:rgba(10,22,40,.97);
      flex-direction:column;align-items:stretch;padding:20px;gap:4px;
      transform:translateX(100%);transition:transform .35s ease;backdrop-filter:blur(16px);
    }
    .nav-links.open{transform:translateX(0)}
    .nav-links a{padding:14px 20px;font-size:1rem;border-radius:var(--radius-md)}
    .nav-toggle{display:flex}
    .article-main{padding:24px}
    .article-featured-img{margin:-24px -24px 24px;min-height:220px;font-size:4rem}
    .article-header h1{font-size:1.4rem}
    .sidebar{flex-direction:column}
    .sidebar-card{min-width:auto}
    .related-grid{grid-template-columns:1fr}
    .prev-next-nav{flex-direction:column;gap:10px}
    .prev-next-nav a{width:100%;justify-content:center}
    .footer-grid{grid-template-columns:1fr;gap:32px}
  }
  @media (max-width: 480px){
    .article-main h2{font-size:1.2rem}
    .article-highlight{padding:20px}
  }