: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,.92);
  backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:18px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:20px;color:var(--jd-dark);white-space:nowrap}
.brand .logo{
  width:38px;height:38px;border-radius:11px;
  background:linear-gradient(135deg,var(--jd),#ff7a45);
  display:grid;place-items: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}
.nav-links{display:flex;gap:4px;margin-left:auto;flex-wrap:nowrap;align-items:center}
.nav-links a{
  padding:6px 10px;border-radius:10px;font-size:13px;color:var(--ink);font-weight:600;transition:.2s;white-space:nowrap;
}
.nav-links a:hover{background:#fff0ec;color:var(--jd-dark)}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:10px;padding:8px 12px;font-size:18px;cursor:pointer}

/* ===== 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;inset: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: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;gap:8px;flex-wrap:wrap;margin-top:16px}
.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)}

/* ===== Sections ===== */
section{padding:44px 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:14px;margin-bottom:22px;flex-wrap:wrap}
.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;gap:10px;flex-wrap:wrap}
.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;gap:18px}
.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;gap: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}

/* ===== 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)}
  .site-footer .cols{grid-template-columns:1fr 1fr}
  .nav-links{gap:3px}
  .nav-links a{font-size:12px;padding:6px 8px}
  .brand{font-size:18px}
}
@media (max-width:768px){
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:10px 18px;border-bottom:1px solid var(--line);flex-wrap:nowrap}
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .grid-2,.grid-3,.grid-4,.fest-grid{grid-template-columns:1fr}
  .article{padding:22px 18px}
  .site-footer .cols{grid-template-columns:1fr}
}