:root{
    --bg:#f6f7f9;
    --card:#ffffff;
    --text:#16181d;
    --text-2:#5f6773;
    --border:#e6e8ec;
    --accent:#3b6ef6;
    --accent-soft:#eef3ff;
    --header-bg:rgba(246,247,249,.82);
    --shadow:0 1px 2px rgba(16,24,40,.04),0 8px 24px rgba(16,24,40,.05);
  }
  html[data-theme="dark"]{
    --bg:#0f1115;
    --card:#171a20;
    --text:#e7e9ee;
    --text-2:#9aa2b1;
    --border:#262a33;
    --accent:#6b93ff;
    --accent-soft:#1b2438;
    --header-bg:rgba(15,17,21,.82);
    --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.35);
  }

  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
    background:var(--bg);
    color:var(--text);
    line-height:1.75;
    -webkit-font-smoothing:antialiased;
    transition:background .25s ease,color .25s ease;
  }
  a{color:inherit;text-decoration:none}
  img{max-width:100%;display:block}

  .container{max-width:1080px;margin:0 auto;padding:0 24px}

  /* ============ 顶栏 ============ */
  .header{
    position:sticky;top:0;z-index:50;
    background:var(--header-bg);
    backdrop-filter:saturate(180%) blur(14px);
    -webkit-backdrop-filter:saturate(180%) blur(14px);
    border-bottom:1px solid var(--border);
  }
  .header-inner{
    height:64px;display:flex;align-items:center;justify-content:space-between;gap:16px;
  }
  .logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:16px;letter-spacing:.2px}
  .logo-mark{
    width:30px;height:30px;border-radius:9px;flex:none;
    background:linear-gradient(135deg,#3b6ef6,#7a5cf0);
    display:flex;align-items:center;justify-content:center;
    color:#fff;font-size:14px;font-weight:800;
  }
  .nav{display:flex;align-items:center;gap:6px}
  .nav a{
    padding:7px 12px;border-radius:8px;font-size:14px;color:var(--text-2);
    transition:background .18s,color .18s;
  }
  .nav a:hover{background:var(--accent-soft);color:var(--accent)}
  .theme-btn{
    width:36px;height:36px;border-radius:9px;border:1px solid var(--border);
    background:var(--card);color:var(--text-2);cursor:pointer;font-size:15px;
    display:flex;align-items:center;justify-content:center;
    transition:background .18s,color .18s,border-color .18s;
  }
  .theme-btn:hover{color:var(--accent);border-color:var(--accent)}

  /* ============ Hero ============ */
  .hero{padding:72px 0 48px;text-align:center}
  .hero-avatar{
    width:76px;height:76px;border-radius:24px;margin:0 auto 20px;
    background:linear-gradient(135deg,#3b6ef6,#7a5cf0);
    display:flex;align-items:center;justify-content:center;
    color:#fff;font-size:30px;font-weight:800;
    box-shadow:0 10px 30px rgba(59,110,246,.28);
  }
  .hero h1{font-size:clamp(26px,4.6vw,40px);font-weight:800;letter-spacing:-.5px;line-height:1.3}
  .hero p{margin-top:14px;color:var(--text-2);font-size:15px;max-width:560px;margin-left:auto;margin-right:auto}
  .hero-tags{margin-top:22px;display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
  .hero-tags span{
    font-size:13px;padding:5px 12px;border-radius:999px;
    background:var(--accent-soft);color:var(--accent);font-weight:500;
  }

  /* ============ 布局 ============ */
  .layout{
    display:grid;grid-template-columns:minmax(0,1fr) 300px;
    gap:36px;padding-bottom:80px;align-items:start;
  }
  @media(max-width:880px){
    .layout{grid-template-columns:1fr;gap:28px}
    .sidebar{order:-1}
  }

  .section-title{
    display:flex;align-items:center;gap:10px;
    font-size:15px;font-weight:700;color:var(--text-2);
    letter-spacing:.4px;text-transform:uppercase;
    margin-bottom:18px;
  }
  .section-title::after{content:"";flex:1;height:1px;background:var(--border)}

  /* ============ 文章卡片 ============ */
  .post-card{
    background:var(--card);border:1px solid var(--border);border-radius:14px;
    padding:24px 26px;margin-bottom:16px;
    transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
  }
  .post-card:hover{
    transform:translateY(-2px);
    box-shadow:var(--shadow);
    border-color:color-mix(in srgb,var(--accent) 35%,var(--border));
  }
  .post-tags{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:12px}
  .tag{
    font-size:12px;padding:3px 10px;border-radius:999px;
    background:var(--accent-soft);color:var(--accent);
    cursor:pointer;transition:opacity .15s;font-weight:500;
  }
  .tag:hover{opacity:.72}
  .post-title{font-size:19px;font-weight:700;line-height:1.5;letter-spacing:-.2px}
  .post-title a{transition:color .18s}
  .post-title a:hover{color:var(--accent)}
  .post-summary{margin-top:10px;font-size:14.5px;color:var(--text-2)}
  .post-meta{
    margin-top:14px;display:flex;align-items:center;gap:14px;
    font-size:13px;color:var(--text-2);
  }
  .post-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--text-2);opacity:.5}

  .empty{
    padding:48px 0;text-align:center;color:var(--text-2);font-size:14px;
  }
  .filter-bar{
    display:none;align-items:center;gap:10px;margin-bottom:16px;
    font-size:13.5px;color:var(--text-2);
  }
  .filter-bar.show{display:flex}
  .filter-bar button{
    font-size:13px;padding:4px 12px;border-radius:999px;cursor:pointer;
    border:1px solid var(--border);background:var(--card);color:var(--text-2);
  }
  .filter-bar button:hover{color:var(--accent);border-color:var(--accent)}

  /* ============ 侧栏 ============ */
  .sidebar{display:flex;flex-direction:column;gap:18px;position:sticky;top:84px}
  @media(max-width:880px){.sidebar{position:static}}
  .widget{
    background:var(--card);border:1px solid var(--border);border-radius:14px;padding:22px;
  }
  .widget h3{
    font-size:14px;font-weight:700;margin-bottom:14px;
    display:flex;align-items:center;gap:8px;
  }
  .widget h3::before{
    content:"";width:3px;height:14px;border-radius:2px;
    background:linear-gradient(180deg,#3b6ef6,#7a5cf0);
  }
  .widget p{font-size:14px;color:var(--text-2);line-height:1.8}
  .tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
  .stat-row{
    display:flex;justify-content:space-between;
    font-size:13.5px;color:var(--text-2);padding:7px 0;
  }
  .stat-row + .stat-row{border-top:1px dashed var(--border)}
  .stat-row b{color:var(--text);font-weight:600}

  /* ============ 页脚 ============ */
  .footer{
    border-top:1px solid var(--border);
    padding:40px 0 48px;text-align:center;
    font-size:13.5px;color:var(--text-2);
  }
  .footer-nav{
    display:flex;justify-content:center;flex-wrap:wrap;gap:20px;margin-bottom:18px;
  }
  .footer-nav a{transition:color .18s}
  .footer-nav a:hover{color:var(--accent)}
  .footer .copyright{margin-bottom:8px}
  .beian{
    display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:8px 16px;
  }
  .beian a{
    display:inline-flex;align-items:center;gap:6px;
    transition:color .18s;
  }
  .beian a:hover{color:var(--accent)}
  .beian .sep{opacity:.35}

  /* ============ 弹窗 ============ */
  .modal{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:24px}
  .modal[hidden]{display:none}
  .modal-mask{position:absolute;inset:0;background:rgba(10,12,16,.55);backdrop-filter:blur(4px)}
  .modal-body{
    position:relative;background:var(--card);border:1px solid var(--border);
    border-radius:18px;width:100%;max-width:760px;max-height:86vh;overflow-y:auto;
    padding:42px 44px 48px;
    animation:pop .22s ease;
  }
  @keyframes pop{from{opacity:0;transform:translateY(12px) scale(.98)}to{opacity:1;transform:none}}
  @media(max-width:640px){.modal{padding:0}.modal-body{border-radius:0;max-height:100vh;height:100%;padding:28px 22px 40px}}
  .modal-close{
    position:absolute;top:18px;right:18px;width:34px;height:34px;border-radius:10px;
    border:1px solid var(--border);background:var(--bg);color:var(--text-2);
    font-size:18px;cursor:pointer;line-height:1;
    display:flex;align-items:center;justify-content:center;
  }
  .modal-close:hover{color:var(--accent);border-color:var(--accent)}
  .modal-body h1{font-size:24px;font-weight:800;line-height:1.45;letter-spacing:-.3px;margin-bottom:14px}
  .modal-meta{
    display:flex;align-items:center;gap:12px;flex-wrap:wrap;
    font-size:13px;color:var(--text-2);padding-bottom:20px;margin-bottom:24px;
    border-bottom:1px solid var(--border);
  }
  .article{font-size:15.5px;line-height:1.95;color:var(--text)}
  .article h2{font-size:18px;font-weight:700;margin:30px 0 12px;letter-spacing:-.2px}
  .article h3{font-size:16px;font-weight:700;margin:22px 0 10px}
  .article p{margin-bottom:15px;color:var(--text)}
  .article ul,.article ol{margin:0 0 15px 22px}
  .article li{margin-bottom:7px}
  .article code{
    font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
    font-size:.88em;padding:2px 6px;border-radius:5px;
    background:var(--accent-soft);color:var(--accent);
  }
  .article pre{
    background:var(--bg);border:1px solid var(--border);border-radius:10px;
    padding:16px 18px;overflow-x:auto;margin-bottom:16px;
  }
  .article pre code{background:none;padding:0;color:var(--text);font-size:13.5px;line-height:1.7}
  .article blockquote{
    border-left:3px solid var(--accent);padding:4px 0 4px 16px;
    margin:0 0 16px;color:var(--text-2);font-size:14.5px;
  }