/* 学尔达 XUERDAS 红金设计系统（企业服务主站） */
:root{
  --red-1:#7c1111;--red-2:#9f1d1d;--red-3:#b42318;
  --gold:#d9a441;--gold-l:#f3cf87;--gold-d:#b8842b;
  --ink:#292524;--muted:#6b7280;--bg:#faf8f4;--line:#e7e2da;
  --alert:#c0392b;--green:#1e7e34;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,"Microsoft YaHei","PingFang SC",sans-serif;background:var(--bg);color:var(--ink);line-height:1.75;font-size:15px}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}

/* ===== 导航 ===== */
.nav{position:sticky;top:0;z-index:99;background:rgba(88,13,13,.97);backdrop-filter:blur(8px)}
.nav-in{max-width:1080px;margin:0 auto;padding:0 20px;display:flex;align-items:center;height:60px;gap:6px}
.nav-logo{font-size:19px;font-weight:800;letter-spacing:1px;background:linear-gradient(135deg,var(--gold),var(--gold-l));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-right:auto}
.nav a.nav-link{color:#e3c9b8;font-size:14px;padding:8px 11px;border-radius:6px;white-space:nowrap}
.nav a.nav-link:hover{color:#fff;background:rgba(255,255,255,.08)}
.nav a.nav-link.active{color:var(--gold-l)}
.nav .nav-cta{background:linear-gradient(135deg,var(--gold-d),var(--gold));color:#4a0d0d;font-weight:700;padding:8px 18px;border-radius:100px;font-size:14px;white-space:nowrap}
@media(max-width:820px){
  .nav-in{overflow-x:auto;scrollbar-width:none}
  .nav-in::-webkit-scrollbar{display:none}
  .nav-logo{font-size:17px}
}

/* ===== Hero ===== */
.hero{background:linear-gradient(135deg,#4a0a0a 0%,#7c1111 55%,#9f1d1d 100%);color:#fff;padding:64px 0 56px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-120px;top:-120px;width:380px;height:380px;border-radius:50%;background:radial-gradient(circle,rgba(217,164,65,.20),transparent 70%)}
.hero .kicker{display:inline-block;border:1px solid rgba(243,207,135,.55);color:var(--gold-l);border-radius:100px;padding:5px 16px;font-size:13px;margin-bottom:18px}
.hero h1{font-size:34px;line-height:1.3;margin-bottom:14px}
.hero h1 em{font-style:normal;background:linear-gradient(135deg,var(--gold),var(--gold-l));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero p.lead{color:#edcfc0;font-size:16px;max-width:680px;margin-bottom:26px}
.btn{display:inline-block;padding:12px 30px;border-radius:100px;font-weight:700;font-size:15px;cursor:pointer;border:none}
.btn-gold{background:linear-gradient(135deg,var(--gold-d),var(--gold));color:#4a0d0d}
.btn-ghost{border:1px solid rgba(255,255,255,.4);color:#fff;background:transparent;margin-left:12px}
.btn-line{display:inline-block;border:1.5px solid var(--gold-d);color:#8a5a10;padding:9px 24px;border-radius:100px;font-weight:700;font-size:14px;background:#fff}

/* ===== 七板块卡 ===== */
.biz7{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:-34px auto 0;position:relative;z-index:2}
.biz7 .b{background:#fff;border-radius:14px;padding:24px 20px;box-shadow:0 6px 24px rgba(88,13,13,.10);border-top:3px solid var(--gold-d)}
.biz7 .b .ico{font-size:24px;margin-bottom:8px}
.biz7 .b h3{font-size:16.5px;margin-bottom:8px;color:var(--red-1)}
.biz7 .b p{font-size:13px;color:var(--muted)}
.biz7 .b .go{display:inline-block;margin-top:12px;color:#8a5a10;font-weight:700;font-size:13.5px}

/* ===== 区块 ===== */
section.sec{padding:56px 0}
section.sec.alt{background:#fff}
.sec h2{font-size:24px;color:var(--red-1);margin-bottom:6px}
.sec .sub{color:var(--muted);font-size:14px;margin-bottom:26px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{background:#fff;border-radius:12px;padding:22px;box-shadow:0 1px 4px rgba(0,0,0,.06)}
.card h4{font-size:15.5px;color:var(--red-1);margin-bottom:8px}
.card p{font-size:13.5px;color:#4b5563}
.chip{display:inline-block;background:#faf0dd;color:#8a5a10;border-radius:6px;padding:2px 10px;font-size:12px;font-weight:600;margin:0 6px 6px 0}
.num{font-size:30px;font-weight:800;color:var(--gold-d)}

/* ===== 表格 ===== */
.tbl{width:100%;border-collapse:collapse;background:#fff;font-size:13.5px;box-shadow:0 1px 3px rgba(0,0,0,.06);border-radius:10px;overflow:hidden}
.tbl th{background:var(--red-1);color:#fff;text-align:left;padding:10px 14px;white-space:nowrap;font-weight:600}
.tbl td{padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl tr:last-child td{border-bottom:none}
.tbl td b{color:#8a5a10}

/* ===== 表单 ===== */
.form-card{background:#fff;border-radius:16px;padding:28px;box-shadow:0 6px 24px rgba(88,13,13,.10);max-width:620px;margin:0 auto}
.form-card h3{font-size:19px;color:var(--red-1);margin-bottom:4px}
.form-card .fm-sub{color:var(--muted);font-size:13px;margin-bottom:18px}
.fg{margin-bottom:14px}
.fg label{display:block;font-size:13.5px;font-weight:600;margin-bottom:6px;color:#374151}
.fg input,.fg select,.fg textarea{width:100%;padding:11px 14px;border:1.5px solid var(--line);border-radius:9px;font-size:14.5px;font-family:inherit;background:#fbfaf7}
.fg input:focus,.fg select:focus,.fg textarea:focus{outline:none;border-color:var(--gold);background:#fff}
.f-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.fm-ok{display:none;background:#e8f6ec;border:1px solid #bfe3c9;color:#1e7e34;border-radius:10px;padding:14px 16px;font-size:14px;margin-bottom:14px}
.fm-err{display:none;background:#fdecea;border:1px solid #f5c6c0;color:var(--alert);border-radius:10px;padding:12px 16px;font-size:13.5px;margin-bottom:14px}

/* ===== FAQ ===== */
.faq{max-width:820px}
.faq details{background:#fff;border-radius:10px;margin-bottom:10px;box-shadow:0 1px 3px rgba(0,0,0,.05);padding:0}
.faq summary{cursor:pointer;padding:15px 20px;font-weight:600;font-size:14.5px;color:var(--red-1);list-style:none;position:relative}
.faq summary::after{content:"+";position:absolute;right:20px;color:var(--gold-d);font-size:20px;font-weight:700}
.faq details[open] summary::after{content:"−"}
.faq .a{padding:0 20px 16px;font-size:13.5px;color:#4b5563}

/* ===== 页脚 ===== */
footer.ft{background:#401010;color:#d3a896;padding:44px 0 28px;margin-top:60px;font-size:13px}
.ft-in{max-width:1080px;margin:0 auto;padding:0 20px}
.ft-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px;margin-bottom:28px}
.ft h4{color:#fff;font-size:14px;margin-bottom:10px}
.ft a{display:block;color:#d3a896;margin-bottom:7px;font-size:13px}
.ft a:hover{color:var(--gold-l)}
.ft .brand{font-size:22px;font-weight:800;background:linear-gradient(135deg,var(--gold),var(--gold-l));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:10px;display:inline-block}
.ft-bottom{border-top:1px solid rgba(255,255,255,.10);padding-top:18px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;color:#b3806e;font-size:12px}
.ft-bottom a{color:#d3a896;display:inline}
.ft-bottom a:hover{color:var(--gold-l)}
.disclaim{background:rgba(255,255,255,.04);border-radius:8px;padding:12px 16px;font-size:12px;color:#b3806e;line-height:1.7;margin-bottom:22px}

/* ===== 时间轴 ===== */
.timeline{position:relative;padding-left:22px}
.timeline::before{content:"";position:absolute;left:5px;top:6px;bottom:6px;width:2px;background:linear-gradient(var(--gold),var(--gold-d))}
.tl-item{position:relative;margin-bottom:18px;padding-left:14px}
.tl-item::before{content:"";position:absolute;left:-22px;top:7px;width:12px;height:12px;border-radius:50%;background:var(--gold-d);border:2px solid #fff;box-shadow:0 0 0 2px var(--gold)}
.tl-item .t{font-weight:700;color:var(--red-1);font-size:14px}
.tl-item .d{font-size:13px;color:var(--muted)}

/* ===== 后台 ===== */
.adm-tabs{display:flex;gap:6px;margin:22px 0 18px;flex-wrap:wrap}
.adm-tabs button{border:1.5px solid var(--line);background:#fff;border-radius:100px;padding:8px 20px;font-size:14px;cursor:pointer;font-family:inherit}
.adm-tabs button.on{background:var(--red-1);color:var(--gold-l);border-color:var(--red-1);font-weight:700}
.lead-tbl td{font-size:13px}
.badge{display:inline-block;border-radius:6px;padding:2px 9px;font-size:12px;font-weight:600}
.badge.g{background:#faf0dd;color:#8a5a10}
.badge.b{background:#fbeae7;color:#7c1111}
.mat{background:#fff;border-radius:12px;padding:20px 22px;margin-bottom:14px;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.mat h4{color:var(--red-1);font-size:15px;margin-bottom:8px}
.mat pre{background:#401010;color:#f0dcd2;border-radius:10px;padding:16px 18px;font-size:13px;line-height:1.8;white-space:pre-wrap;font-family:inherit;margin:10px 0}
.copy-btn{background:var(--gold-d);color:#fff;border:none;border-radius:7px;padding:7px 16px;font-size:13px;cursor:pointer;font-family:inherit}
.copy-btn:hover{background:var(--gold)}

@media(max-width:820px){
  .grid2,.grid3,.biz7,.f-row{grid-template-columns:1fr}
  .hero h1{font-size:26px}
  .ft-grid{grid-template-columns:1fr}
  .hero{padding:44px 0 50px}
}

/* ===== 二三级目录切换页 ===== */
.crumb{font-size:12.5px;color:#9ca3af;padding:18px 0 2px}
.crumb a{color:#9ca3af}
.crumb a:hover{color:#8a5a10}
.tree{display:grid;grid-template-columns:230px 1fr;gap:18px;margin:16px 0 10px;align-items:start}
.tree-side{background:#fff;border-radius:12px;box-shadow:0 1px 4px rgba(0,0,0,.06);overflow:hidden}
.tree-side .side-h{background:linear-gradient(135deg,var(--red-1),var(--red-2));color:var(--gold-l);font-weight:700;font-size:14.5px;padding:12px 16px}
.tree-side a.side-i{display:flex;justify-content:space-between;align-items:center;padding:11px 16px;font-size:14px;border-bottom:1px solid var(--line);cursor:pointer;color:#374151}
.tree-side a.side-i:last-child{border-bottom:none}
.tree-side a.side-i span{color:#c9b18a}
.tree-side a.side-i:hover{background:#fbf6ec;color:#8a5a10}
.tree-side a.side-i.on{background:#faf0dd;color:#7c1111;font-weight:700;border-left:3px solid var(--gold-d);padding-left:13px}
.tree-main{background:#fff;border-radius:12px;box-shadow:0 1px 4px rgba(0,0,0,.06);padding:20px 22px;min-height:420px}
.tree-tabs{display:flex;gap:8px;border-bottom:2px solid var(--line);margin-bottom:18px;flex-wrap:wrap}
.tree-tabs button{border:none;background:none;font-family:inherit;font-size:14.5px;padding:10px 16px;cursor:pointer;color:#6b7280;border-bottom:2.5px solid transparent;margin-bottom:-2px}
.tree-tabs button.on{color:#7c1111;font-weight:700;border-bottom-color:var(--gold-d)}
.ph-box{border:2px dashed #d9c9a8;border-radius:12px;background:#fdfaf3;padding:36px 20px;text-align:center;color:#8a5a10}
.ph-box .big{font-size:34px}
.skel{height:14px;border-radius:7px;background:linear-gradient(90deg,#f1ece2,#faf7f0,#f1ece2);margin:12px 0}
@media(max-width:820px){
  .tree{grid-template-columns:1fr}
  .tree-side{display:flex;overflow-x:auto;scrollbar-width:none}
  .tree-side::-webkit-scrollbar{display:none}
  .tree-side .side-h{display:none}
  .tree-side a.side-i{white-space:nowrap;border-bottom:none;border-left:3px solid transparent}
  .tree-side a.side-i.on{border-left-color:var(--gold-d)}
}