:root{
  --blue:#002FA7; --blue-dark:#001a63; --gold:#C9A24A;
  --text:#1a2330; --text-2:#5b6675; --bg:#ffffff; --bg-2:#F5F7FB;
  --radius:16px; --shadow-sm:0 4px 18px rgba(0,47,167,.08); --shadow:0 14px 40px rgba(0,47,167,.16);
  --nav-h:64px;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.6;-webkit-text-size-adjust:100%;}
img{max-width:100%;}
a{color:inherit;}

/* ===== Nav (frosted white, sticky) ===== */
.nav{position:sticky;top:0;left:0;right:0;z-index:1001;height:var(--nav-h);background:rgba(255,255,255,.90);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid rgba(0,47,167,.12);}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;height:100%;}
.logo{display:flex;align-items:center;gap:6px;font-weight:900;color:var(--blue-dark);text-decoration:none;white-space:nowrap;flex-wrap:nowrap;}
.logo .zh{font-size:18px;letter-spacing:1px;flex:0 0 auto;}
.logo .zh sup{font-size:.55em;font-weight:700;}
.logo .en{font-size:17px;letter-spacing:1.5px;font-weight:800;opacity:.9;flex:0 0 auto;}
.logo sup{font-size:9px;line-height:1;vertical-align:super;margin-left:0;flex:0 0 auto;}
.menu-btn{display:flex;width:32px;height:32px;flex-direction:column;justify-content:center;align-items:center;gap:5px;cursor:pointer;}
.menu-btn span{display:block;width:22px;height:2px;background:var(--blue-dark);border-radius:2px;transition:.3s;}

/* ===== Mobile popup menu (unified: compressed, no overflow) ===== */
.mobile-menu{position:fixed;inset:0;background:rgba(0,26,99,.98);z-index:1002;display:none;flex-direction:column;justify-content:safe center;align-items:center;gap:14px;padding:64px 24px 30px;overflow-y:auto;-webkit-overflow-scrolling:touch;}
.mobile-menu.open{display:flex;}
.mobile-menu a{display:block;width:100%;max-width:420px;box-sizing:border-box;text-align:center;color:#fff;font-size:19px;font-weight:700;padding:6px 0;line-height:1.25;text-decoration:none;}
.mobile-menu a sup{font-size:.6em;}
.mobile-close{position:absolute;top:16px;right:22px;font-size:34px;color:#fff;cursor:pointer;line-height:1;}

/* ===== Hero (aligned with group homepage: hero.jpg photo bg + dark-blue overlay) ===== */
.hero{position:relative;min-height:36vh;min-height:36svh;display:flex;align-items:center;justify-content:center;padding:48px 20px 88px;overflow:hidden;text-align:center;box-sizing:border-box;color:#fff;}
.hero-bg{position:absolute;inset:0;z-index:0;overflow:hidden;background:url(/assets/hero.jpg?v=20260830) center/cover no-repeat;}
.hero-bg::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,26,99,.55) 0%,rgba(0,26,99,.75) 60%,rgba(0,26,99,.92) 100%);}
.hero-content{position:relative;z-index:2;max-width:1200px;margin:0 auto;width:100%;padding:0;text-align:center;}
.hero-kicker{font-size:13px;letter-spacing:3px;color:var(--gold);font-weight:800;margin-bottom:14px;}
.hero h1{font-size:clamp(26px,6.5vw,48px);line-height:1.16;margin:0 0 18px;font-weight:900;letter-spacing:1px;}
.hero h1 sup{font-size:.5em;font-weight:700;}
.hero-desc{font-size:15px;line-height:1.9;color:rgba(255,255,255,.85);max-width:760px;margin:0 auto;}
/* inner pages: align min-height/padding with group homepage so home-nav overlaps seamlessly */
@media (min-width:768px){.hero.page-hero{min-height:36vh;min-height:36svh;padding:48px 20px 88px;}}
@media (max-width:640px){.hero{min-height:360px;padding:72px 16px 88px;}}

/* ===== Home nav (6-grid + 2 AI strips, aligned with group homepage blue bar) ===== */
.home-nav{background:linear-gradient(180deg,#001a63 0%,#002FA7 100%);padding:0 20px 20px;margin-top:-56px;position:relative;z-index:3;}
.home-nav-inner{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;max-width:1100px;margin:0 auto;}
.home-nav-inner a{flex:0 0 calc((100% - 70px)/6);min-width:0;overflow:hidden;text-align:center;text-decoration:none;color:#fff;background:rgba(255,255,255,.07);border:1px solid rgba(201,162,74,.38);border-radius:12px;padding:16px 10px 15px;box-shadow:0 6px 18px rgba(0,15,60,.28);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);transition:transform .25s,background .25s,border-color .25s,box-shadow .25s;}
.home-nav-inner a:hover{background:var(--gold);border-color:var(--gold);transform:translateY(-4px);box-shadow:0 12px 26px rgba(0,15,60,.42);}
.home-nav-inner a:hover .hn-cn{color:var(--blue-dark);}
.home-nav-inner a:hover .hn-en{color:rgba(0,26,99,.78);}
.hn-cn{display:block;font-size:15px;font-weight:800;letter-spacing:1px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.hn-cn sup{font-size:.5em;top:-.7em;}
.hn-en{display:block;font-size:9px;font-weight:700;letter-spacing:1.2px;color:rgba(201,162,74,.95);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:6px;}
.home-nav-ai{display:flex;gap:14px;max-width:1100px;margin:14px auto 0;}
.ai-strip{flex:1 1 0;min-width:0;display:flex;align-items:center;justify-content:center;gap:9px;height:76px;text-decoration:none;color:#fff;background:rgba(255,255,255,.07);border:1px solid rgba(201,162,74,.38);border-radius:12px;padding:14px 18px;box-shadow:0 6px 18px rgba(0,15,60,.28);overflow:hidden;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);transition:transform .25s,background .25s,border-color .25s,box-shadow .25s;}
.ai-strip:hover{background:var(--gold);border-color:var(--gold);transform:translateY(-4px);box-shadow:0 12px 26px rgba(0,15,60,.42);}
.ai-strip:hover .ai-cn,.ai-strip:hover .ai-en{color:var(--blue-dark);}
.ai-cn{display:block;font-size:15px;font-weight:800;letter-spacing:1px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.ai-en{display:block;font-size:9px;font-weight:700;letter-spacing:1.2px;color:rgba(201,162,74,.95);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px;}
@media (max-width:900px){.home-nav-inner a{flex:0 0 calc((100% - 28px)/3);}}
@media (max-width:640px){.home-nav{padding:0 14px 16px;}.home-nav-inner{gap:10px;}.home-nav-inner a{flex:0 0 calc((100% - 20px)/3);height:60px;padding:14px 4px 12px;border-radius:10px;}.hn-cn{font-size:13px;letter-spacing:.5px;}.hn-en{font-size:8px;letter-spacing:.6px;margin-top:4px;}.home-nav-ai{gap:10px;margin-top:12px;}.ai-strip{flex-direction:column;gap:2px;padding:11px 8px;border-radius:10px;height:66px;}.ai-cn{font-size:14px;letter-spacing:.5px;}.ai-en{font-size:8px;letter-spacing:.4px;}}

/* ===== Summary stats (white area) ===== */
.summary-stats{background:#fff;padding:44px 20px 18px;}
.summary-stats-inner{max-width:1000px;margin:0 auto;}
.summary-head{text-align:center;margin-bottom:26px;}
.summary-head .sk{font-size:12px;letter-spacing:3px;color:var(--gold);font-weight:800;}
.summary-head h2{font-size:24px;font-weight:900;color:var(--blue);margin:6px 0 0;}
.series-title{font-size:clamp(22px,3.4vw,30px);font-weight:900;color:var(--blue);margin:6px 0 0;line-height:1.2;}
.series-sub{font-size:14px;color:var(--text-2);line-height:1.8;max-width:760px;margin:12px auto 0;}
.case-head{margin-bottom:30px;}
.summary-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.summary-card{background:linear-gradient(135deg,#F4F7FF 0%,#EAF0FF 100%);border:1px solid rgba(0,47,167,.12);border-radius:16px;padding:24px 14px;text-align:center;}
.summary-card .num{font-size:clamp(24px,4vw,36px);font-weight:900;color:var(--blue);line-height:1.15;}
.summary-card .lab{font-size:13px;color:var(--text-2);margin-top:10px;letter-spacing:.5px;}
@media(max-width:640px){.summary-grid{grid-template-columns:repeat(2,1fr);gap:12px;}.summary-card{padding:18px 10px;}}

/* ===== Generic sections ===== */
.sec{background:#fff;padding:46px 20px;}
.sec-alt{background:var(--bg-2);}
.sec-inner{max-width:1000px;margin:0 auto;}
.sec-head{text-align:center;margin-bottom:30px;}
.sec-kicker{font-size:12px;letter-spacing:3px;color:var(--gold);font-weight:800;}
.sec-title{font-size:26px;font-weight:900;color:var(--blue);margin:8px 0 8px;}
.sec-sub{font-size:14px;color:var(--text-2);line-height:1.8;max-width:760px;margin:0 auto;}

/* reveal (progressive enhancement; visible without JS) */
body.anim .reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease;}
body.anim .reveal.in{opacity:1;transform:none;}

/* ===== Typical cases ===== */
.feature-cases{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:8px;}
.case-card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow-sm);overflow:hidden;display:flex;flex-direction:column;border:1px solid #EDF0F6;}
.case-card-head{background:linear-gradient(135deg,var(--blue-dark) 0%,var(--blue) 100%);color:#fff;padding:22px 22px 18px;}
.case-card-head .tag{display:inline-block;font-size:11px;font-weight:800;background:rgba(255,255,255,.15);padding:4px 10px;border-radius:20px;margin-bottom:10px;}
.case-card-head h3{font-size:19px;font-weight:900;margin:0 0 8px;line-height:1.35;}
.case-card-head p{font-size:13px;color:rgba(255,255,255,.8);margin:0;line-height:1.5;}
.case-card-body{padding:22px;flex:1;display:flex;flex-direction:column;gap:14px;}
.case-metric{display:flex;justify-content:space-between;align-items:center;padding:12px 14px;background:#F7F8FB;border-radius:12px;}
.case-metric .k{font-size:13px;color:var(--text-2);}
.case-metric .v{font-size:16px;font-weight:900;color:var(--blue);text-align:right;}
.case-metric .v.good{color:#0B8A3C;}
.case-card-foot{font-size:13px;color:var(--text-2);line-height:1.7;margin-top:auto;}
@media(max-width:900px){.feature-cases{grid-template-columns:1fr;}}

/* ===== Data table ===== */
.data-sec{margin-top:34px;}
.data-table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;}
.data-table{width:100%;border-collapse:collapse;font-size:13px;min-width:560px;}
.data-table th,.data-table td{padding:11px 13px;text-align:left;border-bottom:1px solid #EDF0F6;line-height:1.5;vertical-align:top;}
.data-table th{background:#F4F7FF;color:var(--blue);font-weight:800;white-space:nowrap;}
.data-table td{color:var(--text-2);}
.data-table tbody tr:hover{background:#FAFBFE;}
.c-good{color:#0B8A3C;font-weight:800;}
.c-blue{color:var(--blue);font-weight:700;}

/* ===== Conclusion ===== */
.concl{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:26px;}
.concl-item{background:#fff;border-left:4px solid var(--blue);border-radius:0 12px 12px 0;padding:18px 20px;box-shadow:var(--shadow-sm);}
.concl-item h4{margin:0 0 7px;font-size:16px;color:var(--blue);}
.concl-item p{margin:0;font-size:13px;color:var(--text-2);line-height:1.7;}
@media(max-width:900px){.concl{grid-template-columns:1fr;}}

/* ===== Pathway pipe (gout) ===== */
.pipe{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:10px;}
.pipe-step{background:#fff;border-radius:14px;padding:20px 16px;box-shadow:var(--shadow-sm);border-top:3px solid var(--gold);}
.pipe-step .ph{font-size:12px;color:var(--gold);font-weight:800;letter-spacing:1px;}
.pipe-step h4{margin:6px 0 8px;font-size:16px;color:var(--blue);}
.pipe-step p{margin:0;font-size:12.5px;color:var(--text-2);line-height:1.6;}
@media(max-width:900px){.pipe{grid-template-columns:repeat(2,1fr);}}
@media(max-width:520px){.pipe{grid-template-columns:1fr;}}

/* ===== Product CTA ===== */
.product-cta{background:linear-gradient(135deg,var(--blue-dark),var(--blue));border-radius:var(--radius);padding:42px 28px;text-align:center;color:#fff;margin-top:36px;}
.product-cta h3{font-size:24px;font-weight:900;margin:0 0 12px;}
.product-cta p{font-size:15px;color:rgba(255,255,255,.8);max-width:680px;margin:0 auto 24px;line-height:1.8;}

/* ===== Buttons ===== */
.btn{display:inline-block;padding:14px 30px;border-radius:30px;font-size:15px;font-weight:800;text-decoration:none;cursor:pointer;border:none;}
.btn-primary{background:var(--gold);color:var(--blue-dark);box-shadow:0 10px 28px rgba(201,162,74,.35);}
.btn-primary:hover{transform:translateY(-2px);}

/* ===== PPT original figures ===== */
.ppt-sec{padding:46px 16px 30px;}
.ppt-grid{max-width:900px;margin:0 auto;display:flex;flex-direction:column;gap:22px;}
.ppt-fig{margin:0;}
.ppt-fig img{width:100%;border-radius:12px;box-shadow:var(--shadow-sm);display:block;background:#fff;}
.ppt-fig figcaption{text-align:center;color:var(--text-2);font-size:12px;margin-top:8px;letter-spacing:1px;}

/* ===== Hub dimension bar ===== */
.dims-sec{background:var(--bg-2);padding:46px 20px;}
.dim-bar{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;margin-top:6px;}
.dim-btn{flex:1 1 calc((100% - 36px)/4);min-width:120px;text-align:center;background:linear-gradient(135deg,var(--blue),var(--blue-dark));color:#fff;padding:18px 10px;border-radius:12px;font-weight:800;font-size:16px;text-decoration:none;border:1px solid rgba(255,255,255,.15);transition:transform .2s,box-shadow .2s;}
.dim-btn:hover{transform:translateY(-3px);box-shadow:0 10px 26px rgba(0,47,167,.3);}
@media(max-width:560px){.dim-btn{flex:1 1 calc((100% - 12px)/2);min-width:0;font-size:14px;}}
.case-block-foot{margin-top:24px;text-align:center;}

/* ===== Hub hero subtitle (small) + button ===== */
.hero-sub-sm{font-size:clamp(15px,2.6vw,20px);font-weight:700;color:var(--gold);letter-spacing:1.5px;margin:12px 0 0;}
.hero-btn{margin-top:20px;}

/* ===== Directions grid (hub) ===== */
.dir-sec{background:#fff;padding:46px 20px 54px;}
.dir-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:12px;}
.dir-card{display:block;text-decoration:none;background:linear-gradient(160deg,#fff 0%,#F5F8FF 100%);border:1px solid rgba(0,47,167,.14);border-radius:18px;padding:24px 22px;box-shadow:var(--shadow-sm);transition:transform .2s,box-shadow .2s;}
.dir-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);}
.dir-card-head{display:flex;align-items:baseline;gap:10px;margin-bottom:16px;padding-bottom:14px;border-bottom:1px solid rgba(0,47,167,.10);}
.dir-name{font-size:21px;font-weight:900;color:var(--blue);}
.dir-en{font-size:12px;font-weight:800;letter-spacing:1.5px;color:var(--gold);}
.dir-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:16px;}
.ds{background:#fff;border:1px solid #EDF0F6;border-radius:12px;padding:12px 10px;text-align:center;}
.ds b{display:block;font-size:clamp(18px,3.2vw,24px);font-weight:900;color:var(--blue);line-height:1.1;}
.ds b i{font-size:.62em;font-weight:700;font-style:normal;}
.ds span{display:block;font-size:12px;color:var(--text-2);margin-top:5px;line-height:1.3;}
.dir-go{display:inline-block;font-size:14px;font-weight:800;color:var(--blue);}
.dir-card:hover .dir-go{text-decoration:underline;}
/* ===== Back-to-hub button (on each case subpage, for convenient return) ===== */
.case-back-wrap{max-width:1100px;margin:0 auto;padding:18px 20px 0;}
.case-back{display:inline-flex;align-items:center;gap:6px;padding:10px 22px;border-radius:30px;background:var(--blue);color:#fff;font-size:14px;font-weight:800;text-decoration:none;box-shadow:var(--shadow-sm);transition:transform .2s,background .2s,color .2s;}
.case-back:hover{transform:translateY(-2px);background:var(--gold);color:var(--blue-dark);}
@media(max-width:640px){.case-back-wrap{padding:14px 16px 0;}.case-back{padding:9px 18px;font-size:13px;}}
@media(max-width:640px){.dir-grid{grid-template-columns:1fr;}}

/* ===== Footer ===== */
.ux-footer{background:var(--blue);border-top:1px solid rgba(255,255,255,.25);padding:34px 20px 26px;color:#fff;font-size:13px;line-height:1.6;}
.ux-footer-inner{max-width:1000px;margin:0 auto;text-align:center;}
.ux-footer-row{display:flex;justify-content:center;align-items:center;gap:18px;flex-wrap:wrap;margin-bottom:8px;}
.ux-footer-version{font-weight:800;color:#fff;font-size:13px;letter-spacing:.3px;}
.ux-footer-record{color:rgba(255,255,255,.85);font-size:13px;}
.ux-footer-copy{color:rgba(255,255,255,.6);font-size:12px;margin-bottom:10px;}
.ux-footer-disclaimer{color:rgba(255,255,255,.45);font-size:11px;max-width:720px;margin:0 auto;line-height:1.5;}
.ux-footer-tongji{transition:opacity .2s;}
.ux-footer-tongji:hover{opacity:.85;}
@media(max-width:480px){.ux-footer{padding:28px 16px 22px;font-size:12px;}.ux-footer-row{gap:10px;}}