:root{
    --bg:#0d1117; --card:#12171d; --card2:#0a0e12; --line:#202a35;
    --txt:#d8dee6; --mut:#8b96a3; --dim:#6b7684;
    --green:#3ecf7a; --green2:#2aa35f; --gold:#e3c060; --red:#e36358; --orange:#e89a4a;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{background:var(--bg);color:var(--txt);
    font-family:"Microsoft YaHei","PingFang SC",sans-serif;
    font-size:16px;line-height:1.75;padding:0 16px 80px}
  .wrap{max-width:900px;margin:0 auto}
  /* ===== 头部 ===== */
  header{text-align:center;padding:64px 0 36px}
  header .logo{display:inline-flex;align-items:center;gap:14px}
  header .dot{width:22px;height:22px;border-radius:50%;border:5px solid var(--green);
    box-shadow:0 0 18px rgba(62,207,122,.55)}
  header h1{font-size:34px;color:#fff;letter-spacing:1px}
  header .ver{display:inline-block;margin-left:10px;font-size:14px;color:var(--green);
    border:1px solid var(--green2);border-radius:20px;padding:1px 12px;vertical-align:middle}
  header p{color:var(--mut);margin-top:10px;font-size:15px}
  /* ===== 目录 ===== */
  nav{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;margin-bottom:40px}
  nav a{color:var(--txt);text-decoration:none;font-size:15px;
    background:var(--card);border:1px solid var(--line);border-radius:22px;padding:7px 18px;
    transition:.15s}
  nav a:hover{border-color:var(--green2);color:var(--green)}
  nav a b{color:var(--green);margin-right:6px}
  nav a.dl{background:var(--green);border-color:var(--green);color:#08130c;font-weight:700;
    box-shadow:0 0 14px rgba(62,207,122,.35)}
  nav a.dl:hover{background:#5fe496;color:#08130c}
  /* ===== 章节 ===== */
  section{background:var(--card);border:1px solid var(--line);border-radius:16px;
    padding:34px 38px;margin-bottom:28px}
  h2{display:flex;align-items:center;gap:14px;font-size:24px;color:#fff;margin-bottom:6px}
  h2 .num{flex:none;width:34px;height:34px;border-radius:9px;background:rgba(62,207,122,.12);
    border:1px solid var(--green2);color:var(--green);font-size:17px;
    display:flex;align-items:center;justify-content:center}
  h3{font-size:19px;color:#fff;margin:34px 0 4px;padding-left:12px;
    border-left:4px solid var(--green);line-height:1.4}
  h4{font-size:16px;color:var(--green);margin:22px 0 2px}
  .note{color:var(--mut);font-size:14.5px;margin-bottom:10px}
  ul.feat{list-style:none;margin:14px 0 4px}
  ul.feat li{padding:7px 0 7px 28px;position:relative}
  ul.feat li::before{content:"";position:absolute;left:6px;top:17px;width:8px;height:8px;
    border-radius:50%;background:var(--green)}
  ul.feat li .sub{color:var(--mut);font-size:14.5px}
  /* ===== 图片 ===== */
  figure{background:var(--card2);border:1px solid var(--line);border-radius:12px;
    padding:12px;margin:16px 0;text-align:center}
  figure img{max-width:100%;height:auto;border-radius:7px;display:block;margin:0 auto;cursor:zoom-in}
  figcaption{color:var(--mut);font-size:13.5px;margin-top:9px;line-height:1.55}
  figcaption b{color:var(--txt);font-weight:600}
  .row{display:flex;gap:16px;flex-wrap:wrap;align-items:stretch}
  .row figure{flex:1 1 240px;margin:16px 0 0;display:flex;flex-direction:column;justify-content:space-between}
  .row figure img{margin:auto}
  .side{display:flex;gap:24px;flex-wrap:wrap;align-items:flex-start;margin-top:8px}
  .side figure{flex:0 1 380px;margin:8px 0}
  .side .stext{flex:1 1 300px;min-width:260px}
  .limit-s img{max-width:300px}
  .limit-m img{max-width:430px}
  .limit-l img{max-width:640px}
  /* ===== 引用 ===== */
  blockquote{border-left:4px solid var(--gold);background:rgba(227,192,96,.07);
    border-radius:0 10px 10px 0;padding:14px 20px;margin:16px 0;color:var(--txt)}
  blockquote .by{display:block;color:var(--gold);font-size:14px;margin-top:6px}
  /* ===== 图标介绍 ===== */
  .icons{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:14px;margin:14px 0 6px}
  .icons .it{background:var(--card2);border:1px solid var(--line);border-radius:12px;
    text-align:center;padding:16px 10px}
  .icons img{width:68px;height:68px;border-radius:10px}
  .icons .lb{margin-top:10px;font-size:15px;font-weight:600}
  .icons .t1{color:var(--green)} .icons .t2{color:var(--gold)}
  .icons .t3{color:var(--orange)} .icons .t4{color:var(--red)}
  .icons .d{color:var(--dim);font-size:12.5px;margin-top:2px}
  /* ===== 灯箱 ===== */
  #lb{position:fixed;inset:0;background:rgba(5,8,11,.93);display:none;
    align-items:center;justify-content:center;z-index:99;cursor:zoom-out;padding:24px}
  #lb img{max-width:96vw;max-height:94vh;border-radius:8px}
  footer{text-align:center;color:var(--dim);font-size:13.5px;margin-top:44px}
  @media (max-width:640px){section{padding:24px 18px}header h1{font-size:26px}

}
.x1{margin-top:20px !important}
.x2{font-size:15px !important;color:var(--mut) !important;font-weight:400 !important}
.x3{margin-top:6px !important}
.x4{flex:0 1 330px !important}
.x5{margin-top:4px !important}
.x6{flex:0 1 340px !important}
.x7{flex:0 1 300px !important}
.x8{margin-top:8px !important}
.x9{font-size:14px !important;color:var(--mut) !important;font-weight:400 !important}
.x10{border-style:dashed !important;text-align:center !important;padding:28px !important}
.x11{color:var(--mut) !important;font-size:16.5px !important;letter-spacing:2px !important}

/* phones: fixed-width image limits must not push the page wider than the screen (desktop unchanged) */
.limit-s img{max-width:min(300px,100%)}
.limit-m img{max-width:min(430px,100%)}
.limit-l img{max-width:min(640px,100%)}
.row figure,.side figure{min-width:0}
.side .stext{min-width:min(260px,100%)}


/* netdisk line under the nav (added for lqzs.org) */
.dlinfo{text-align:center;color:var(--mut);font-size:14px;margin:-26px 0 34px}
.dlinfo b{color:var(--green);font-weight:700;letter-spacing:1px}
.dlinfo .tip{color:var(--green);margin-left:8px}