/* ================= 基础 ================= */
:root{
  --bg:#f2f4f8;
  --panel:#ffffff;
  --text:#1f2329;
  --muted:#646a73;
  --faint:#8f959e;
  --border:#e5e6eb;
  --border-soft:#f0f1f3;
  --brand:#3370ff;
  --brand-hover:#245bdb;
  --brand-weak:#eef3ff;
  --danger:#d83931;
  --danger-weak:#fdecec;
  --ok:#00a870;
  --ok-weak:#e8fff4;
  --radius:14px;
  --shadow:0 1px 2px rgba(31,35,41,.06), 0 6px 18px rgba(31,35,41,.06);
  --ff:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--ff);font-size:15px;line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
button{font-family:var(--ff)}
img{max-width:100%}

/* ================= 顶栏 ================= */
.topbar{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--border);
}
.topbar-inner{
  max-width:1120px;margin:0 auto;height:58px;padding:0 18px;
  display:flex;align-items:center;justify-content:space-between;gap:14px;
}
.brand{display:flex;align-items:center;gap:10px;min-width:0;color:var(--text)}
.brand:hover{text-decoration:none}
.brand-mark{
  width:30px;height:30px;flex:0 0 30px;border-radius:8px;
  background:linear-gradient(135deg,#3370ff,#5b8dff);color:#fff;
  font-size:15px;font-weight:700;display:flex;align-items:center;justify-content:center;
}
.brand-text{display:flex;flex-direction:column;line-height:1.22;min-width:0}
.brand-text strong{font-size:15px;white-space:nowrap}
.brand-text small{font-size:11.5px;color:var(--faint);white-space:nowrap}
.topnav{display:flex;gap:6px;align-items:center}
.nav-btn{
  border:1px solid transparent;background:transparent;color:var(--muted);
  font-size:14px;padding:6px 14px;border-radius:20px;cursor:pointer;
  transition:all .15s;white-space:nowrap;
}
.nav-btn:hover{background:#f2f3f5;color:var(--text)}
.nav-btn.on{background:var(--brand-weak);color:var(--brand);font-weight:600}

/* ================= 主容器 ================= */
.app{max-width:1120px;margin:0 auto;padding:30px 18px 40px;min-height:62vh}
.doc{max-width:800px;margin:0 auto;animation:fadeUp .28s ease}
@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

/* 面包屑 */
.crumb{display:flex;align-items:center;gap:8px;margin-bottom:14px;font-size:13.5px;color:var(--faint);flex-wrap:wrap}
.crumb a{color:var(--faint)}
.crumb a:hover{color:var(--brand);text-decoration:none}
.crumb .sep{opacity:.5}
.crumb .cur{color:var(--text);font-weight:500}
.btn-back{
  display:inline-flex;align-items:center;gap:4px;border:none;background:transparent;
  color:var(--muted);font-size:13.5px;cursor:pointer;padding:2px 6px 2px 0;border-radius:6px;
}
.btn-back:hover{color:var(--brand)}

.page-title{margin:2px 0 6px;font-size:24px;line-height:1.35}
.page-sub{margin:0 0 20px;color:var(--muted);font-size:14.5px}

/* ================= 首页 ================= */
.hero{
  background:linear-gradient(135deg,#1f3b8f 0%,#3370ff 55%,#5b8dff 100%);
  color:#fff;border-radius:18px;padding:34px 32px;margin-bottom:26px;
  box-shadow:0 10px 26px rgba(51,112,255,.25);position:relative;overflow:hidden;
}
.hero::after{
  content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;
  background:rgba(255,255,255,.08);
}
.hero h1{margin:0 0 6px;font-size:27px;letter-spacing:.4px}
.hero p{margin:0;opacity:.93;font-size:14.5px;max-width:600px}
.hero .hint{margin-top:14px;display:inline-flex;gap:6px;align-items:center;font-size:12.5px;background:rgba(255,255,255,.16);padding:5px 12px;border-radius:20px}

.home-label{
  display:flex;align-items:center;gap:8px;margin:4px 0 14px;
  font-size:13px;color:var(--muted);letter-spacing:.04em;
}
.home-label::after{content:"";flex:1;height:1px;background:var(--border)}

/* 四分类卡片 */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.cat-card{
  position:relative;display:flex;flex-direction:column;gap:4px;
  background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);
  padding:22px 18px 16px;cursor:pointer;text-align:left;color:var(--text);
  box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s,border-color .15s;
  overflow:hidden;
}
.cat-card::before{content:"";position:absolute;inset:0 0 auto;height:4px;background:var(--c,#3370ff)}
.cat-card:hover{transform:translateY(-4px);box-shadow:0 10px 24px rgba(31,35,41,.12);border-color:#c9cdd4}
.cat-card:active{transform:translateY(-1px) scale(.99)}
.cat-ico{
  width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  font-size:28px;background:var(--weak,#eef3ff);margin-bottom:8px;
}
.cat-name{font-size:17px;font-weight:700;display:flex;align-items:center;gap:6px}
.cat-desc{font-size:12.5px;color:var(--muted);line-height:1.55;flex:1}
.cat-go{margin-top:8px;font-size:12.5px;color:var(--c,#3370ff);font-weight:600;display:flex;align-items:center;gap:4px}
.cat-go .arw{transition:transform .15s}
.cat-card:hover .cat-go .arw{transform:translateX(3px)}

.cat-phone{--c:#3370ff;--weak:#eef3ff}
.cat-cloud {--c:#7b5cff;--weak:#f1edff}
.cat-pc    {--c:#ff8a00;--weak:#fff4e6}
.cat-script{--c:#00a870;--weak:#e8fff4}

/* ================= 弹窗提问 ================= */
.modal-mask{
  position:fixed;inset:0;z-index:100;background:rgba(20,24,34,.5);
  display:flex;align-items:center;justify-content:center;padding:20px;
  animation:fadeIn .18s ease;
}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.modal{
  width:100%;max-width:430px;background:#fff;border-radius:18px;
  box-shadow:0 20px 60px rgba(0,0,0,.25);padding:8px;animation:pop .2s ease;
}
@keyframes pop{from{opacity:0;transform:scale(.94) translateY(8px)}to{opacity:1;transform:none}}
.modal-head{display:flex;align-items:flex-start;justify-content:space-between;padding:16px 16px 6px}
.modal-title{font-size:18px;font-weight:700;margin:0;line-height:1.4}
.modal-sub{font-size:13px;color:var(--faint);margin:4px 0 0}
.modal-close{
  border:none;background:#f2f3f5;color:var(--muted);width:28px;height:28px;border-radius:50%;
  cursor:pointer;font-size:14px;flex:0 0 28px;transition:background .15s;
}
.modal-close:hover{background:#e5e6eb;color:var(--text)}
.modal-body{padding:10px 12px 14px;display:flex;flex-direction:column;gap:10px}
.q-opt{
  display:flex;align-items:center;gap:12px;width:100%;text-align:left;
  border:1px solid var(--border);border-radius:12px;background:#fff;
  padding:14px;cursor:pointer;transition:all .15s;
}
.q-opt:hover{border-color:var(--brand);background:var(--brand-weak)}
.q-opt:active{transform:scale(.985)}
.q-ico{width:42px;height:42px;flex:0 0 42px;border-radius:11px;background:var(--weak,#eef3ff);display:flex;align-items:center;justify-content:center;font-size:22px}
.q-txt{flex:1;min-width:0}
.q-txt b{display:block;font-size:15px}
.q-txt span{font-size:12.5px;color:var(--muted);line-height:1.45;display:block}
.q-cancel{border:none;background:none;color:var(--faint);font-size:13px;cursor:pointer;padding:6px}
.q-cancel:hover{color:var(--muted)}
/* 视频弹窗 */
.modal-video{max-width:900px}
.vmodal-player{display:block;width:100%;max-height:70vh;aspect-ratio:16/9;background:#000;border-radius:12px}

/* ================= 内联选择（直接访问 #pc / 无root方案） ================= */
.pick-list{display:flex;flex-direction:column;gap:14px}
.pick{
  display:flex;align-items:center;gap:16px;background:var(--panel);
  border:1px solid var(--border);border-radius:var(--radius);padding:18px;
  box-shadow:var(--shadow);cursor:pointer;transition:all .15s;
}
.pick:hover{border-color:var(--c,#3370ff);box-shadow:0 8px 22px rgba(31,35,41,.1);transform:translateY(-2px)}
.pick-ico{width:54px;height:54px;flex:0 0 54px;border-radius:14px;background:var(--weak,#eef3ff);display:flex;align-items:center;justify-content:center;font-size:28px}
.pick-main{flex:1;min-width:0}
.pick-main b{font-size:16px;display:block}
.pick-main span{font-size:13px;color:var(--muted)}
.pick-go{color:var(--c,#3370ff);font-weight:700;font-size:13px;display:flex;gap:4px;align-items:center}
.pick.c-ld{--c:#ff8a00;--weak:#fff4e6}
.pick.c-mu{--c:#ff6b2c;--weak:#fff0ea}
.pick.c-wifi{--c:#3370ff;--weak:#eef3ff}
.pick.c-vm{--c:#7b5cff;--weak:#f1edff}

/* ================= 内容块 ================= */
.block{margin-bottom:22px}
.block-title{
  display:flex;align-items:center;gap:9px;font-size:16.5px;font-weight:700;
  margin:0 0 12px;color:var(--text);
}
.block-title .tno{
  width:23px;height:23px;flex:0 0 23px;border-radius:50%;background:var(--brand);color:#fff;
  font-size:13px;display:flex;align-items:center;justify-content:center;
}
.block-subtitle{
  display:flex;align-items:center;gap:8px;margin:18px 0 10px;
  font-size:14.5px;font-weight:700;color:var(--text);
}
.block-subtitle::before{content:"";width:3px;height:14px;flex:0 0 3px;border-radius:2px;background:var(--brand)}
.card{
  background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:18px;
}
.callout{border-radius:10px;padding:12px 14px;margin:10px 0;border:1px solid transparent;font-size:14px}
.callout-info{background:var(--brand-weak);border-color:#d6e4ff;color:#1d4ed8}
.callout-ok{background:var(--ok-weak);border-color:#c8f0e0;color:#00785a}
.callout-warn{background:var(--danger-weak);border-color:#f7d5d3;color:#c0392b}
ul.list,ol.list{margin:6px 0 12px;padding-left:22px}
.list li{margin:5px 0}
/* 图标步骤列表 + 关键字高亮 */
ul.list.steps,ol.list.steps{list-style:none;padding-left:0}
.steps li{display:flex;align-items:flex-start;gap:10px;margin:9px 0}
.li-ico{
  flex:0 0 22px;width:22px;height:22px;margin-top:3px;border-radius:7px;
  background:var(--brand-weak);color:var(--brand);font-size:12px;
  display:flex;align-items:center;justify-content:center;
}
.litxt{flex:1;min-width:0}
.kw{color:var(--brand);font-weight:700}
.kw-warn{color:#d97706;font-weight:700}
.kw-ok{color:var(--ok);font-weight:700}
/* 设置步骤卡 */
.set-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:14px}
.setcard{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;box-shadow:var(--shadow)}
.setcard-head{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.setcard-head .li-ico{width:28px;height:28px;flex:0 0 28px;margin-top:0;border-radius:8px;font-size:15px}
.setcard-head b{display:block;font-size:15.5px}
.setcard-sub{font-size:12.5px;color:var(--faint)}
.setcard .list{margin:4px 0 0}
.setcard .steps li{margin:7px 0}
.setcard .callout{margin:10px 0 0;font-size:13.5px}
code{background:#f2f3f5;border:1px solid var(--border-soft);border-radius:5px;padding:1px 6px;font-size:.88em;font-family:Consolas,Menlo,monospace;color:#c7254e}

/* 下载卡 */
.download{
  background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);
  padding:16px;margin:14px 0;display:flex;align-items:center;justify-content:flex-start;
  gap:16px;flex-wrap:wrap;box-shadow:var(--shadow);
}
.download-info{flex:0 1 auto}
.download-label{display:block;font-size:12px;color:var(--faint);margin-bottom:3px}
.download-actions{display:flex;gap:8px;flex-shrink:0}
.btn{
  display:inline-flex;align-items:center;gap:6px;justify-content:center;
  padding:8px 16px;border-radius:9px;border:1px solid var(--border);background:#fff;color:var(--text);
  font-size:14px;cursor:pointer;transition:all .15s;text-decoration:none;
}
.btn:hover{border-color:#c9cdd4;background:#fafbfc;text-decoration:none}
.btn-primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-hover);border-color:var(--brand-hover);color:#fff}
.btn-lg{padding:11px 20px;font-size:15px}

/* 视频卡 */
.vcard{margin:0 0 16px;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.vcard figcaption{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:12px 16px;border-bottom:1px solid var(--border-soft)}
.vtitle{font-weight:700;font-size:15px;display:flex;align-items:center;gap:7px}
.vtitle::before{content:"▶";width:20px;height:20px;flex:0 0 20px;border-radius:6px;background:var(--brand);color:#fff;font-size:10px;display:flex;align-items:center;justify-content:center}
.tag{font-size:12px;padding:2px 9px;border-radius:20px;background:#f2f3f5;color:var(--muted)}
.tag-danger{background:var(--danger-weak);color:var(--danger);font-weight:600}
.tag-warn{background:#fff4e6;color:#d97706}
.player{display:block;width:100%;height:auto;max-height:68vh;background:#000;aspect-ratio:16/9;object-fit:contain}
.vcard.is-missing .player{display:none}
.video-missing{padding:26px 16px;text-align:center;color:var(--faint);font-size:14px;background:repeating-linear-gradient(45deg,#fafbfc,#fafbfc 10px,#f4f5f7 10px,#f4f5f7 20px)}
.video-missing b{display:block;color:var(--muted);margin-bottom:4px}

/* 占位内容 */
.placeholder{
  background:var(--panel);border:1px dashed #c9cdd4;border-radius:var(--radius);
  padding:36px 22px;text-align:center;color:var(--muted);
}
.placeholder .ph-ico{font-size:40px;display:block;margin-bottom:10px}
.placeholder b{font-size:16px;display:block;color:var(--text);margin-bottom:4px}
.placeholder p{margin:0;font-size:13.5px}

/* 视频列表（小预览网格 → 点击弹窗播放）
   一行放几个：改 --vg-min 即可（值越小列越多，越大列越少） */
.vgallery{
  --vg-min:240px;
  display:grid;grid-template-columns:repeat(auto-fill,minmax(var(--vg-min),1fr));
  gap:12px;
}
.vitem{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:10px;box-shadow:var(--shadow)}
.vshot{
  position:relative;width:100%;aspect-ratio:16/9;
  border-radius:10px;overflow:hidden;background:#000;cursor:pointer;
}
.vshot:hover .vplay{transform:translate(-50%,-50%) scale(1.08)}
.vshot:focus-visible,.vname:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
.vpreview{display:block;width:100%;height:100%;object-fit:cover;background:#000}
.vplay{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:46px;height:46px;border-radius:50%;background:rgba(0,0,0,.55);color:#fff;
  font-size:16px;display:flex;align-items:center;justify-content:center;transition:transform .15s;
}
.vname{
  display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin-top:8px;
  font-size:13.5px;font-weight:600;cursor:pointer;width:100%;
}
.vname-ico{
  width:18px;height:18px;flex:0 0 18px;border-radius:5px;background:var(--brand);color:#fff;
  font-size:9px;display:flex;align-items:center;justify-content:center;
}
.vitem.is-missing .vshot{background:repeating-linear-gradient(45deg,#fafbfc,#fafbfc 10px,#f4f5f7 10px,#f4f5f7 20px);cursor:default}
.vitem.is-missing .vplay{display:none}
.vitem.is-missing .vname{cursor:default}
.vitem.is-missing .vname-ico{background:#c9cdd4}
.vg-missing{
  margin-top:8px;padding:12px 8px;text-align:center;color:var(--faint);font-size:12.5px;
  background:repeating-linear-gradient(45deg,#fafbfc,#fafbfc 10px,#f4f5f7 10px,#f4f5f7 20px);
  border-radius:10px;
}
.vg-missing b{display:block;color:var(--muted);margin-bottom:2px}

/* ================= 页脚 / 悬浮件 ================= */
.footer{max-width:1120px;margin:0 auto;padding:20px 18px 34px;color:var(--faint);font-size:12.5px;text-align:center;border-top:1px solid var(--border)}
.to-top{
  position:fixed;right:22px;bottom:26px;z-index:50;
  width:40px;height:40px;border-radius:50%;border:1px solid var(--border);background:#fff;color:var(--muted);
  font-size:18px;cursor:pointer;box-shadow:var(--shadow);
  opacity:0;pointer-events:none;transition:opacity .2s;
}
.to-top.show{opacity:1;pointer-events:auto}
.toast{
  position:fixed;left:50%;bottom:80px;transform:translateX(-50%) translateY(10px);
  background:rgba(31,35,41,.92);color:#fff;padding:8px 18px;border-radius:8px;font-size:14px;
  opacity:0;pointer-events:none;transition:all .2s;z-index:120;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ================= 响应式 ================= */
@media (max-width:980px){
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .vgallery{--vg-min:200px}
  .download{flex-direction:column;align-items:flex-start;gap:10px}
  .download-actions .btn{padding:7px 16px;font-size:13px}
}
@media (max-width:620px){
  .cat-grid{grid-template-columns:1fr}
  .app{padding:20px 14px 34px}
  .hero{padding:24px 20px}
  .hero h1{font-size:22px}
  .page-title{font-size:20px}
  .topbar-inner{padding:0 10px;gap:8px}
  .brand-text small{display:none}
  .topnav{gap:2px}
  .nav-btn{padding:6px 10px;font-size:13px}
  .download{padding:12px;margin:10px 0;gap:8px}
  .download-label{margin-bottom:0}
  .modal-body{padding:8px 8px 10px}
  .modal-mask{padding:10px}
  .modal-video{max-width:100%}
  .vmodal-player{max-height:52vh}
  .vgallery{grid-template-columns:1fr}
  .set-grid{grid-template-columns:1fr}
}