:root{
  --jd:#e1251b;
  --jd-dark:#c81623;
  --gold:#ffb000;
  --gold-2:#ffd666;
  --ink:#241c19;
  --muted:#6b5e58;
  --bg:#fff8f3;
  --card:#ffffff;
  --line:#f0e2da;
  --radius:18px;
  --shadow:0 10px 30px rgba(193,58,43,.10);
  --shadow-hover:0 18px 44px rgba(193,58,43,.18);
  --maxw:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
h1,h2,h3,h4{line-height:1.35;margin:0 0 .5em;font-weight:800}
p{margin:0 0 1em}
.container{max-width:var(--maxw);margin:0 auto;padding:0 18px}
.muted{color:var(--muted)}
.center{text-align:center}

/* ===== Header ===== */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.97);
  -webkit-backdrop-filter:saturate(160%) blur(10px);
  backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid var(--line);
}
/* ⚠️ 兼容性约定：导航内部一律不使用 flex 的 gap
   （Safari < 14.1 / iOS < 14.5 / 旧 Android WebView 不支持 flex gap，
    会导致导航项全部贴在一起，是「导航栏错乱」的典型原因），改用 margin 控间距。 */
.nav{display:flex;align-items:center;height:64px}
.brand{display:flex;align-items:center;font-weight:900;font-size:20px;color:var(--jd-dark);white-space:nowrap}
.brand .logo{
  width:38px;height:38px;border-radius:11px;margin-right:10px;
  background:linear-gradient(135deg,var(--jd),#ff7a45);
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:20px;box-shadow:var(--shadow);
}
.brand small{display:block;font-size:11px;font-weight:600;color:var(--muted);letter-spacing:.5px}
/* ---- 桌面导航：分组下拉式 ---- */
.nav-links{display:flex;margin-left:auto;flex-wrap:nowrap;align-items:center}
.nav-links > a,.nav-drop-t{
  display:inline-block;vertical-align:middle;
  margin:0 1px;padding:7px 11px;border-radius:10px;
  font-family:inherit;font-size:13.5px;line-height:1.6;font-weight:600;
  color:var(--ink);text-align:left;white-space:nowrap;cursor:pointer;
  border:0;background:none;                    /* 还原 <button> 默认外观 */
  -webkit-appearance:none;appearance:none;
  -webkit-tap-highlight-color:rgba(225,37,27,0);
  transition:background-color .18s,color .18s;
}
.nav-links > a:hover,.nav-drop.open .nav-drop-t,.nav-drop:focus-within .nav-drop-t{background:#fff0ec;color:var(--jd-dark)}
.nav-links > a.active,.nav-drop.active .nav-drop-t{background:#fff0ec;color:var(--jd-dark);box-shadow:inset 0 -2px 0 var(--jd)}
.nav-drop{position:relative;margin:0 1px}
.nav-drop-t .caret{display:inline-block;margin-left:4px;font-style:normal;font-size:10px;opacity:.55;transition:transform .2s}
.nav-drop.open .caret,.nav-drop:focus-within .caret{transform:rotate(180deg)}
.nav-drop-menu{
  position:absolute;top:100%;left:50%;margin-top:8px;transform:translateX(-50%) translateY(6px);
  min-width:184px;background:#fff;border:1px solid var(--line);border-radius:14px;
  box-shadow:0 18px 44px rgba(140,60,40,.16);padding:8px;
  display:flex;flex-direction:column;
  opacity:0;visibility:hidden;transition:opacity .18s,visibility .18s,transform .18s;z-index:60;
}
.nav-drop.open .nav-drop-menu,
.nav-drop:focus-within .nav-drop-menu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
/* 悬停展开：仅对真正支持 hover 的设备生效（渐进增强，触屏设备靠 JS 点击展开） */
@media (hover:hover){
  .nav-links > a:hover,.nav-drop:hover .nav-drop-t{background:#fff0ec;color:var(--jd-dark)}
  .nav-drop:hover .caret{transform:rotate(180deg)}
  .nav-drop:hover .nav-drop-menu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
}
/* 悬停桥接：光标从菜单标题移向菜单时不致中断 */
.nav-drop::after{content:"";position:absolute;left:0;right:0;top:100%;height:10px}
.nav-drop-menu a{
  display:block;padding:8px 12px;border-radius:9px;font-size:13.5px;color:var(--ink);font-weight:600;
  white-space:nowrap;transition:background-color .15s,color .15s,padding-left .15s;
}
.nav-drop-menu a + a{margin-top:2px}
.nav-drop-menu a:hover,.nav-drop-menu a:focus{background:linear-gradient(135deg,#fff0ec,#ffe6dc);color:var(--jd-dark);padding-left:15px}
.nav-drop-menu a.active{background:#fff0ec;color:var(--jd-dark)}
.nav-cta{
  flex:0 0 auto;margin-left:12px;
  background:linear-gradient(135deg,var(--jd),#ff7a45);color:#fff;
  font-size:13.5px;font-weight:800;padding:9px 16px;border-radius:999px;
  box-shadow:0 8px 20px rgba(225,37,27,.28);white-space:nowrap;transition:.2s;
}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 12px 26px rgba(225,37,27,.34)}
.nav-toggle{
  display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:10px;
  padding:8px 12px;font-size:18px;line-height:1;color:var(--ink);cursor:pointer;
  -webkit-appearance:none;appearance:none;-webkit-tap-highlight-color:rgba(225,37,27,0);
}

/* ===== Hero ===== */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(1200px 400px at 80% -10%, rgba(255,214,102,.35), transparent 60%),
    linear-gradient(135deg,#e1251b 0%,#ff6a3d 55%,#ff9a3d 100%);
  color:#fff;padding:54px 0 60px;
}
.hero::after{
  content:"";position:absolute;top:0;right:0;bottom:0;left:0;
  background-image:radial-gradient(rgba(255,255,255,.10) 1px,transparent 1px);
  background-size:22px 22px;opacity:.5;pointer-events:none;
}
.hero .container{position:relative;z-index:1;display:grid;grid-template-columns:1.4fr 1fr;gap:34px;align-items:center}
.hero h1{font-size:34px;font-size:clamp(28px,4vw,44px);text-shadow:0 2px 14px rgba(0,0,0,.18)}
.hero .sub{font-size:17px;opacity:.95;max-width:520px}
.hero .tags{display:flex;flex-wrap:wrap;margin:16px -4px 0}
.hero .tags span{margin:0 4px 8px}
.hero .tags span{background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.35);padding:5px 12px;border-radius:999px;font-size:13px}
.code-card{
  background:linear-gradient(160deg,#fff,#fff6ec);
  color:var(--ink);border-radius:20px;padding:24px;box-shadow:0 20px 50px rgba(0,0,0,.25);
}
.code-card .label{font-size:13px;color:var(--muted);font-weight:700;letter-spacing:1px}
.code-card .code{
  font-size:30px;font-weight:900;color:var(--jd-dark);letter-spacing:2px;margin:8px 0 4px;
  font-family:"PingFang SC","Microsoft YaHei",monospace;
}
.code-card .valid{font-size:13px;color:var(--muted)}
.copy-btn{
  margin-top:14px;width:100%;border:none;cursor:pointer;
  background:linear-gradient(135deg,var(--jd),#ff7a45);color:#fff;font-weight:800;
  padding:12px;border-radius:12px;font-size:15px;box-shadow:var(--shadow);transition:.2s;
}
.copy-btn:active{transform:scale(.98)}
.code-steps{margin-top:14px;font-size:13px;color:var(--muted);line-height:1.9}
.code-steps b{color:var(--jd-dark)}
/* ---- 场景口令速查 ---- */
.code-strip{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin-top:6px}
.code-cell{background:#fff;border:1px solid #ffe2cf;border-radius:16px;padding:18px 20px;box-shadow:0 6px 18px rgba(0,0,0,.05);transition:.2s}
.code-cell:hover{border-color:var(--jd);transform:translateY(-2px);box-shadow:0 12px 28px rgba(193,58,43,.12)}
.code-cell-label{font-size:12px;font-weight:800;color:#8a6a5a;letter-spacing:1px}
.code-cell-code{font-size:24px;font-weight:900;color:var(--jd-dark);letter-spacing:2px;margin:8px 0 6px;font-family:"PingFang SC","Microsoft YaHei",monospace;word-break:break-all}
.code-cell-tip{font-size:12.5px;color:var(--muted);line-height:1.7}

/* ===== Sections ===== */
section{padding:44px 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:22px;flex-wrap:wrap}
.section-head > *{margin-right:14px}
.section-head h2{font-size:26px}
.section-head .more{color:var(--jd-dark);font-weight:700;font-size:14px}
.eyebrow{display:inline-block;color:var(--jd-dark);font-weight:800;font-size:13px;letter-spacing:2px;margin-bottom:6px}

/* ===== Grid + Cards ===== */
.grid{display:grid;gap:18px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;box-shadow:var(--shadow);transition:.22s;display:flex;flex-direction:column;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:#ffd2c4}
.card .cat{font-size:12px;font-weight:800;color:var(--jd-dark);letter-spacing:1px}
.card h3{font-size:18px;margin:6px 0 8px}
.card p{font-size:14px;color:var(--muted);margin:0}
.card .meta{margin-top:auto;padding-top:12px;font-size:12px;color:#b3a59d}
.pill{display:inline-block;background:#fff0ec;color:var(--jd-dark);font-size:12px;font-weight:700;padding:3px 10px;border-radius:999px;margin:0 6px 6px 0}

/* ===== Article layout ===== */
.layout{display:grid;grid-template-columns:1fr 300px;gap:30px;align-items:start}
.article{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 32px;box-shadow:var(--shadow);
}
.article .crumb{font-size:13px;color:var(--muted);margin-bottom:10px}
.article h1{font-size:30px}
.article h2{font-size:22px;margin-top:30px;padding-left:12px;border-left:4px solid var(--jd)}
.article h3{font-size:18px;margin-top:22px;color:var(--jd-dark)}
.article p{color:#3a322e}
.article ul{margin:0 0 1em;padding-left:22px}
.article li{margin:.4em 0}
.article .lead{font-size:16px;color:#4a413c;background:#fff8f2;border-left:4px solid var(--gold);padding:14px 16px;border-radius:0 12px 12px 0;margin:18px 0}
.item{
  border:1px solid var(--line);border-radius:14px;padding:16px;margin:14px 0;background:#fffdfb;
}
.item .top{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap}
.item .top > *{margin-right:10px}
.item .name{font-weight:800;font-size:16px}
.item .price{color:var(--jd-dark);font-weight:800;white-space:nowrap}
.item .tag{font-size:12px;font-weight:700;color:#fff;background:var(--gold);padding:2px 9px;border-radius:999px}
.item p{font-size:14px;color:var(--muted);margin:8px 0 0}
.tips{background:#f3fbf6;border:1px solid #cdeed7;border-radius:14px;padding:16px 18px;margin:18px 0}
.tips h3{color:#1f8a4c;margin-top:0}
.tips li{color:#2f5d40}
.cta-box{
  background:linear-gradient(135deg,#fff4ec,#ffe9d6);border:2px dashed var(--jd);
  border-radius:16px;padding:20px;margin:22px 0;text-align:center;
}
.cta-box .code{font-size:26px;font-weight:900;color:var(--jd-dark);letter-spacing:2px}
.cta-box .btn{
  display:inline-block;margin-top:12px;background:linear-gradient(135deg,var(--jd),#ff7a45);
  color:#fff;font-weight:800;padding:11px 22px;border-radius:12px;box-shadow:var(--shadow);
}
.faq-item{border-bottom:1px solid var(--line);padding:14px 0}
.faq-item h4{margin:0 0 6px;font-size:16px}
.faq-item p{margin:0;font-size:14px;color:var(--muted)}

/* ===== Sidebar ===== */
.side{position:sticky;top:84px;display:flex;flex-direction:column}
.side > *{margin-bottom:18px}
.side > *:last-child{margin-bottom:0}
.side .box{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.side h4{font-size:15px;margin:0 0 12px;color:var(--jd-dark)}
.side .code-mini{background:linear-gradient(135deg,#e1251b,#ff7a45);color:#fff;border-radius:12px;padding:14px;text-align:center;margin-bottom:12px}
.side .code-mini .c{font-size:20px;font-weight:900;letter-spacing:1px}
.side .code-mini .v{font-size:12px;opacity:.9}
.side ul{list-style:none;margin:0;padding:0}
.side li{font-size:14px;padding:7px 0;border-bottom:1px dashed var(--line)}
.side li:last-child{border-bottom:none}
.side li a:hover{color:var(--jd-dark)}

/* ===== Festival strip ===== */
.fest-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.fest{
  border-radius:16px;padding:22px;color:#fff;position:relative;overflow:hidden;
  box-shadow:var(--shadow);min-height:140px;display:flex;flex-direction:column;justify-content:flex-end;
}
.fest.mid{background:linear-gradient(135deg,#c0392b,#e67e22)}
.fest.qx{background:linear-gradient(135deg,#8e2de2,#ff6a88)}
.fest.teacher{background:linear-gradient(135deg,#0f9b8e,#3aa6a0)}
.fest.nat{background:linear-gradient(135deg,#b71540,#e55039)}
.fest.school{background:linear-gradient(135deg,#1e3799,#4a69bd)}
.fest h3{color:#fff;font-size:20px;margin:0}
.fest p{margin:4px 0 0;font-size:13px;opacity:.95}

/* ===== Footer ===== */
.site-footer{background:#221b18;color:#cdbfb8;margin-top:30px;padding:40px 0 28px}
.site-footer a{color:#e7d8d0}
.site-footer .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:24px}
.site-footer h5{color:#fff;font-size:15px;margin:0 0 12px}
.site-footer ul{list-style:none;margin:0;padding:0;font-size:13px}
.site-footer li{padding:5px 0}
.disclaimer{
  margin-top:26px;padding:16px;background:#2e2622;border-radius:12px;
  font-size:12.5px;color:#b9aba3;line-height:1.9;border:1px solid #3a312c;
}
.disclaimer b{color:#ffd666}
.footer-bottom{border-top:1px solid #3a312c;margin-top:22px;padding-top:16px;font-size:12.5px;color:#9b8d85;display:flex;justify-content:space-between;flex-wrap:wrap}
.footer-bottom > *{margin-right:8px;margin-bottom:8px}

/* ===== Breadcrumb page header ===== */
.page-hero{background:linear-gradient(135deg,#fff,#fff1e8);border-bottom:1px solid var(--line);padding:34px 0}
.page-hero h1{font-size:30px}
.page-hero .desc{color:var(--muted);max-width:760px}

/* ===== 2026 双11 专题区（首页旗舰入口） ===== */
.s11-zone{
  position:relative;overflow:hidden;color:#fff;
  background:
    radial-gradient(900px 320px at 10% -25%, rgba(255,122,69,.30), transparent 62%),
    radial-gradient(760px 300px at 92% 120%, rgba(255,214,102,.16), transparent 62%),
    linear-gradient(135deg,#2a1310 0%,#3b1a14 48%,#1b0d0b 100%);
}
.s11-zone::before{
  content:"";position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;
  background-image:radial-gradient(rgba(255,255,255,.07) 1px,transparent 1px);
  background-size:24px 24px;opacity:.55;
}
.s11-zone .container{position:relative;z-index:1}
.s11-head{display:flex;align-items:flex-end;justify-content:space-between;flex-wrap:wrap;margin-bottom:24px}
.s11-head > *{margin-right:18px}
.s11-eyebrow{display:inline-block;color:#ffd666;font-weight:800;font-size:13px;letter-spacing:2px;margin-bottom:8px}
.s11-zone h2{font-size:24px;font-size:clamp(22px,3vw,30px);color:#fff;margin:0 0 10px}
.s11-desc{color:rgba(255,255,255,.80);font-size:14.5px;max-width:760px;margin:0;line-height:1.85}
.s11-cta{
  background:linear-gradient(135deg,#e1251b,#ff9a3d);color:#fff;font-weight:800;font-size:14px;
  padding:12px 24px;border-radius:999px;box-shadow:0 14px 34px rgba(225,37,27,.38);
  white-space:nowrap;transition:.2s;
}
.s11-cta:hover{transform:translateY(-2px);box-shadow:0 18px 40px rgba(225,37,27,.48)}
.s11-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.s11-card{
  display:block;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);
  border-radius:16px;padding:20px 18px;transition:.22s;
}
.s11-card:hover{
  background:rgba(255,255,255,.14);border-color:#ffba4a;transform:translateY(-4px);
  box-shadow:0 18px 38px rgba(0,0,0,.30);
}
.s11-emoji{font-size:26px;display:block;margin-bottom:9px}
.s11-card h3{color:#fff;font-size:17px;margin:0 0 7px}
.s11-card .s11-sub{color:rgba(255,255,255,.62);font-size:12.5px;margin:0}
.s11-hot{
  display:flex;flex-wrap:wrap;align-items:center;margin:24px -5px 0;padding-top:18px;
  border-top:1px dashed rgba(255,255,255,.18);
}
.s11-hot > *{margin:0 5px 10px}
.s11-hot-label{color:#ffd666;font-size:12.5px;font-weight:800;letter-spacing:1px}
.s11-hot a{
  color:rgba(255,255,255,.86);font-size:13px;padding:6px 13px;border-radius:999px;
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);transition:.18s;
}
.s11-hot a:hover{background:#e1251b;border-color:#e1251b;color:#fff;transform:translateY(-1px)}

/* ===== Responsive ===== */
@media (max-width:980px){
  .hero .container{grid-template-columns:1fr}
  .layout{grid-template-columns:1fr}
  .side{position:static}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .fest-grid{grid-template-columns:repeat(2,1fr)}
  .s11-grid{grid-template-columns:repeat(2,1fr)}
  .site-footer .cols{grid-template-columns:1fr 1fr}
  .nav-links > a,.nav-drop-t{font-size:12px;padding:6px 8px}
  .nav-cta{font-size:12px;padding:8px 12px;margin-left:8px}
  .brand{font-size:18px}
  .nav-drop-menu{min-width:168px}
}
/* ---- 首页友情链接（页脚上方） ---- */
.friend-section{background:#fff;border-top:1px solid var(--line);padding:26px 0 30px}
/* 兼容：不用 flex gap，用 margin 控间距（旧 Safari/iOS 不支持 flex gap） */
.friend-links{display:flex;flex-wrap:wrap;margin:0 -6px;margin-top:6px}
.friend-chip{display:inline-flex;align-items:center;margin:0 6px 12px;color:#444;font-weight:600;text-decoration:none;font-size:14px;padding:9px 18px;border:1px solid #eee;border-radius:999px;background:linear-gradient(135deg,#fff,#fafafa);box-shadow:0 2px 8px rgba(0,0,0,.04);transition:.18s}
.friend-chip::before{content:"";width:7px;height:7px;border-radius:50%;margin-right:6px;background:linear-gradient(135deg,#e1251b,#ff7a45);flex:0 0 auto}
.friend-chip:hover{color:#e1251b;border-color:#ffd2c2;transform:translateY(-2px);box-shadow:0 8px 20px rgba(225,37,27,.12)}
.friend-chip:hover::before{background:linear-gradient(135deg,#c81623,#e1251b)}

@media (max-width:768px){
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:8px 18px 14px;border-bottom:1px solid var(--line);flex-wrap:nowrap;box-shadow:0 16px 30px rgba(0,0,0,.08);z-index:70}
  .nav-links.open{display:flex}
  .nav-links > a{margin:0}
  .nav-drop{margin:0}
  /* 抽屉内把下拉摊平：菜单标题降级为分组标签 */
  .nav-drop{position:static}
  .nav-drop::after{display:none}
  .nav-drop-t{display:block;width:100%;margin:0;padding:14px 0 4px;font-size:11.5px;font-weight:800;color:var(--muted);letter-spacing:1px;cursor:default}
  .nav-drop-t .caret{display:none}
  .nav-drop.open .nav-drop-t,
  .nav-drop:hover .nav-drop-t,
  .nav-drop:focus-within .nav-drop-t{background:none;color:var(--muted);box-shadow:none}
  .nav-drop-menu{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:none;background:transparent;min-width:0;margin-top:0;padding:0;display:block}
  .nav-drop-menu a{padding:10px 0;border-bottom:1px solid #f5f5f5;border-radius:0;font-size:14px}
  .nav-drop-menu a + a{margin-top:0}
  .nav-drop-menu a:hover,.nav-drop-menu a:focus{padding-left:0;background:none;color:var(--jd)}
  .nav-cta{display:none}
  .nav-toggle{display:block}
  .grid-2,.grid-3,.grid-4,.fest-grid,.s11-grid{grid-template-columns:1fr}
  .article{padding:22px 18px}
  .site-footer .cols{grid-template-columns:1fr}
}