/* ========== 设计变量：改颜色只需改这里 ========== */
:root{
  --blue:#1f45a8;        /* 主色 */
  --blue-dark:#15317e;   /* 深蓝：页头、页脚、波浪区 */
  --blue-deep:#0f2463;
  --blue-soft:#e8eef9;   /* 栏目标题底色 */
  --bg:#f3f5fa;          /* 页面底色 */
  --line:#e3e7f0;
  --text:#2b2f38;
  --muted:#7a8193;
  --red:#d93a2b;         /* 价格、强调 */
  --w:1200px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;font-size:14px;color:var(--text);background:var(--bg);line-height:1.6}
a{color:inherit;text-decoration:none}
a:hover{color:var(--blue)}
ul{list-style:none}
img{max-width:100%;display:block}
.wrap{width:var(--w);max-width:calc(100% - 32px);margin:0 auto}
:focus-visible{outline:2px solid #ffb400;outline-offset:2px}

/* ========== 页头 ========== */
.head{background:var(--blue-dark) linear-gradient(100deg,#15317e 0%,#1f45a8 60%,#15317e 100%);color:#fff;position:relative;overflow:hidden}
.head::after{content:"";position:absolute;right:-80px;top:-120px;width:520px;height:320px;border-radius:50%;border:1px solid rgba(255,255,255,.08);box-shadow:0 0 0 40px rgba(255,255,255,.03),0 0 0 90px rgba(255,255,255,.02)}
.head .wrap{display:flex;align-items:center;justify-content:space-between;height:96px;position:relative;z-index:1}
.logo{display:flex;align-items:center;gap:14px}
.logo-mark{width:58px;height:58px;border-radius:50%;background:#fff;display:grid;place-items:center;flex:none}
.logo-mark svg{width:40px;height:40px}
.logo h1{font-size:26px;letter-spacing:3px;font-weight:700;line-height:1.2}
.logo p{font-size:12px;opacity:.75;letter-spacing:.5px}
.head-r{text-align:right}
.toplinks{font-size:12px;opacity:.85;display:flex;gap:16px;justify-content:flex-end;margin-bottom:10px}
.toplinks a:hover{color:#fff;text-decoration:underline}
.head-r .row{display:flex;align-items:center;gap:18px}
.search{display:flex;background:rgba(255,255,255,.95);border-radius:3px;overflow:hidden}
.search input{border:0;padding:0 10px;height:30px;width:180px;font-size:12px;outline:none;background:transparent}
.search button{border:0;background:#ffb400;color:var(--blue-deep);padding:0 12px;cursor:pointer;font-weight:600}
.hotline{display:flex;align-items:center;gap:8px}
.hotline b{font-size:20px;letter-spacing:1px}
.hotline small{display:block;font-size:11px;opacity:.7;line-height:1}

/* 导航 */
.nav{background:var(--blue);border-top:1px solid rgba(255,255,255,.12);position:sticky;top:0;z-index:50;box-shadow:0 2px 8px rgba(15,36,99,.25)}
.nav ul{display:flex}
.nav li{flex:1;position:relative}
.nav li>a{display:block;text-align:center;color:#fff;font-size:15px;font-weight:600;line-height:46px}
.nav li>a:hover,.nav li.on>a{background:var(--blue-deep);color:#fff}
.nav li.on>a{box-shadow:inset 0 -3px 0 #ffb400}
.sub{position:absolute;left:0;right:0;top:46px;background:#fff;box-shadow:0 6px 18px rgba(0,0,0,.12);display:none}
.nav li:hover .sub,.nav li:focus-within .sub{display:block}
.sub a{display:block;padding:10px 0;text-align:center;border-bottom:1px solid var(--line);font-size:13px}
.sub a:hover{background:var(--blue-soft)}
.menu-btn{display:none}

/* ========== 大图 ========== */
.banner{position:relative;height:440px;overflow:hidden;background:var(--blue-deep)}
.slide{position:absolute;inset:0;opacity:0;transition:opacity .8s;display:flex;align-items:center}
.slide.on{opacity:1}
.s1{background:linear-gradient(115deg,#0f2463 0%,#1f45a8 55%,#5d8ae0 100%)}
.s2{background:linear-gradient(115deg,#123a7a 0%,#2a64b8 60%,#8db5ec 100%)}
.s3{background:linear-gradient(115deg,#1a2f78 0%,#3452b5 55%,#a5b8ea 100%)}
.slide::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:40px 40px;mask-image:linear-gradient(90deg,transparent,#000 70%)}
.slide .wrap{position:relative;display:flex;align-items:center;justify-content:space-between;height:100%}
.slide-txt{color:#fff;max-width:560px;padding-bottom:40px}
.slide-txt h2{font-size:42px;font-weight:800;letter-spacing:2px;line-height:1.25;margin-bottom:14px}
.slide-txt p{font-size:17px;opacity:.9;margin-bottom:26px}
.tags{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:28px}
.tags span{border:1px solid rgba(255,255,255,.5);padding:3px 14px;border-radius:2px;font-size:14px;background:rgba(255,255,255,.08)}
.btn{display:inline-block;padding:10px 28px;border-radius:3px;font-weight:600;font-size:15px}
.btn-y{background:#ffb400;color:var(--blue-deep)}
.btn-y:hover{background:#ffc53a;color:var(--blue-deep)}
.btn-o{border:1px solid #fff;color:#fff;margin-left:10px}
.btn-o:hover{background:#fff;color:var(--blue)}
.helix{width:420px;height:360px;flex:none}
.cap{position:absolute;left:0;right:0;bottom:0;background:rgba(10,24,70,.72);color:#fff;height:44px;z-index:2}
.cap .wrap{display:flex;justify-content:space-between;align-items:center;height:100%}
.cap p{font-size:14px;font-weight:600}
.dots{display:flex;gap:8px}
.dots button{width:11px;height:11px;border-radius:50%;border:0;background:rgba(255,255,255,.45);cursor:pointer}
.dots button.on{background:#ffb400}

/* ========== 通用栏目盒 ========== */
.sec{margin-top:22px}
.grid{display:grid;grid-template-columns:1fr 360px;gap:22px}
.box{background:#fff;border:1px solid var(--line)}
.box-hd{display:flex;align-items:stretch;justify-content:space-between;background:var(--blue-soft);height:40px;border-bottom:2px solid var(--blue)}
.tabs{display:flex}
.tabs button{border:0;background:transparent;padding:0 20px;font-size:16px;font-weight:700;color:#3a4256;cursor:pointer;font-family:inherit}
.tabs button.on{background:var(--blue);color:#fff}
.more{align-self:center;margin-right:12px;font-size:12px;color:var(--muted)}
.box-bd{padding:16px 18px}
.pane{display:none}
.pane.on{display:block}

/* 图文头条 */
.feat{display:flex;gap:16px;padding-bottom:14px;border-bottom:1px dashed var(--line);margin-bottom:8px}
.pic{flex:none;width:220px;height:128px;background:linear-gradient(135deg,#2a5bc4,#86a9e8);position:relative;overflow:hidden}
.pic img{width:100%;height:100%;object-fit:cover}
.pic span{position:absolute;inset:0;display:grid;place-items:center;color:#fff;font-weight:700;letter-spacing:2px}
.pic img+span{display:none}
.feat h3{font-size:16px;color:var(--blue);margin-bottom:6px;line-height:1.4}
.feat p{font-size:13px;color:var(--muted);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.feat time{font-size:12px;color:var(--muted)}

/* 列表 */
.list li{display:flex;justify-content:space-between;gap:12px;line-height:34px;border-bottom:1px solid #f1f3f8}
.list li:last-child{border:0}
.list a{position:relative;padding-left:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.list a::before{content:"";position:absolute;left:0;top:15px;width:5px;height:5px;background:var(--blue)}
.list time{color:var(--muted);font-size:12px;flex:none}

/* 日期块列表 */
.dlist li{display:flex;gap:12px;padding:9px 0;border-bottom:1px solid #f1f3f8}
.dlist li:last-child{border:0}
.date{flex:none;width:58px;height:54px;background:var(--blue);color:#fff;text-align:center;line-height:1.1;padding-top:7px}
.date b{display:block;font-size:22px}
.date small{font-size:11px;opacity:.85}
.dlist a{font-size:13.5px;line-height:1.55;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;align-self:center}

/* 鉴定项目行 */
.svc li{display:grid;grid-template-columns:44px 1fr auto;gap:14px;align-items:center;padding:12px 0;border-bottom:1px solid #f1f3f8}
.svc li:last-child{border:0}
.svc .ic{width:44px;height:44px;border-radius:50%;background:var(--blue-soft);display:grid;place-items:center;color:var(--blue)}
.svc h4{font-size:16px}
.svc h4 a:hover{text-decoration:underline}
.svc p{font-size:13px;color:var(--muted)}
.price{text-align:right;white-space:nowrap}
.price b{color:var(--red);font-size:24px}
.price small{color:var(--muted);font-size:12px}
.price a{display:block;font-size:12px;color:var(--blue);margin-top:2px}

/* 右侧资质卡 */
.cert-pic{height:190px;background:linear-gradient(160deg,#dfe8fb,#b8cdf2);position:relative;display:grid;place-items:center}
.cert-seal{width:128px;height:128px;border-radius:50%;border:3px solid var(--blue);display:grid;place-items:center;text-align:center;color:var(--blue);background:rgba(255,255,255,.7);box-shadow:0 0 0 6px rgba(31,69,168,.12)}
.cert-seal b{font-size:26px;display:block;line-height:1}
.cert-seal small{font-size:12px}
.cert-txt{padding:14px 16px;font-size:13px;color:#4a5160;line-height:1.8}
.cert-txt strong{color:var(--blue)}
.addr{margin:0 16px 16px;padding:12px;background:var(--bg);font-size:13px;line-height:1.9}
.addr b{color:var(--blue)}

/* ========== 蓝色波浪区 ========== */
.band{margin-top:28px;background:var(--blue-dark);position:relative;overflow:hidden;padding:30px 0 34px}
.band svg.wave{position:absolute;inset:0;width:100%;height:100%;opacity:.35}
.band .wrap{position:relative}
.band .box{border:0}
.steps{display:grid;grid-template-columns:repeat(6,1fr);gap:0;counter-reset:s;margin:6px 0 14px}
.steps li{text-align:center;position:relative;padding:0 4px}
.steps li::after{content:"";position:absolute;top:26px;left:calc(50% + 30px);right:calc(-50% + 30px);border-top:2px dashed #b8c6e6}
.steps li:last-child::after{display:none}
.steps .n{width:54px;height:54px;border-radius:50%;margin:0 auto 10px;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:22px;font-weight:800;box-shadow:0 0 0 5px var(--blue-soft)}
.steps h4{font-size:15px}
.steps p{font-size:12px;color:var(--muted)}
.cities{display:flex;flex-wrap:wrap;gap:8px;padding-top:12px;border-top:1px dashed var(--line)}
.cities span{font-size:12px;padding:2px 10px;background:var(--blue-soft);color:var(--blue)}
.adv li{display:flex;gap:12px;padding:11px 0;border-bottom:1px solid #f1f3f8}
.adv li:last-child{border:0}
.adv h4{font-size:15px;color:var(--blue)}
.adv p{font-size:13px;color:#555;line-height:1.6}

/* ========== 采样方法宫格 ========== */
.tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.tile{background:linear-gradient(180deg,#f0f2f7,#dde2ec);height:150px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;transition:background .2s}
.tile svg{width:62px;height:62px;color:var(--blue)}
.tile b{font-size:15px}
.tile small{font-size:12px;color:var(--muted);margin-top:-8px}
.tile:hover{background:var(--blue);color:#fff}
.tile:hover svg,.tile:hover small{color:#fff}

/* 荣誉资质 */
.honor{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.honor .pic{width:auto;height:150px;border:1px solid var(--line);background:linear-gradient(135deg,#eef2fb,#d7e0f3)}
.honor .pic span{color:var(--blue)}

/* ========== 快捷入口 ========== */
.quick{background:#fff;border:1px solid var(--line);display:grid;grid-template-columns:repeat(7,1fr);padding:26px 10px}
.quick a{text-align:center;font-size:14px}
.quick i{width:66px;height:66px;border-radius:50%;background:var(--blue);display:grid;place-items:center;margin:0 auto 10px;color:#fff;box-shadow:0 0 0 5px var(--blue-soft);transition:transform .2s}
.quick a:hover i{transform:translateY(-3px);background:var(--blue-deep)}
.quick svg{width:30px;height:30px}

/* ========== 页脚 ========== */
.foot-links{margin-top:28px;background:var(--blue);padding:16px 0}
.foot-links .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.foot-links select{width:100%;height:34px;border:0;padding:0 10px;font-family:inherit;color:#333;border-radius:2px}
.foot{background:var(--blue-dark);color:rgba(255,255,255,.85);padding:30px 0 0;position:relative;overflow:hidden}
.foot .wrap{display:grid;grid-template-columns:260px 1fr auto;gap:36px;align-items:center;padding-bottom:26px;position:relative}
.foot .logo h1{font-size:22px}
.foot h5{font-size:16px;color:#fff;margin-bottom:8px}
.foot p{font-size:13px;line-height:2}
.qr{text-align:center;font-size:12px}
.qr .code{width:110px;height:110px;background:#fff;padding:6px;margin-bottom:6px}
.qr .code img{width:100%;height:100%}
.copy{border-top:1px solid rgba(255,255,255,.12);font-size:12px;padding:12px 0;color:rgba(255,255,255,.6)}
.copy .wrap{display:flex;justify-content:space-between;padding:0;grid-template-columns:none}
.copy a:hover{color:#fff}

/* 右侧悬浮 */
.float{position:fixed;right:14px;top:45%;z-index:60;display:flex;flex-direction:column;gap:2px}
.float a,.float button{width:54px;height:54px;background:var(--blue);color:#fff;border:0;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:11px;cursor:pointer;font-family:inherit;gap:2px}
.float a:hover,.float button:hover{background:#ffb400;color:var(--blue-deep)}
.float svg{width:20px;height:20px}

/* 手机底部栏 */
.mbar{display:none}

/* ========== 响应式 ========== */
@media (max-width:1100px){
  .grid{grid-template-columns:1fr}
  .helix{width:300px}
  .steps{grid-template-columns:repeat(3,1fr);row-gap:20px}
  .steps li:nth-child(3)::after{display:none}
  .quick{grid-template-columns:repeat(4,1fr);row-gap:22px}
  .honor{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:768px){
  body{padding-bottom:56px}
  .head .wrap{height:70px}
  .logo-mark{width:44px;height:44px}.logo-mark svg{width:30px;height:30px}
  .logo h1{font-size:19px;letter-spacing:1px}.logo p{display:none}
  .head-r .toplinks,.search,.hotline small{display:none}
  .hotline b{font-size:0}
  .menu-btn{display:block;background:transparent;border:1px solid rgba(255,255,255,.5);color:#fff;padding:4px 10px;font-size:14px;border-radius:3px;cursor:pointer}
  .nav ul{display:none;flex-direction:column}
  .nav.open ul{display:flex}
  .nav li>a{text-align:left;padding-left:18px;line-height:42px;border-bottom:1px solid rgba(255,255,255,.1)}
  .sub{position:static;box-shadow:none}
  .banner{height:360px}
  .helix{display:none}
  .slide-txt h2{font-size:28px}
  .slide-txt p{font-size:14px}
  .cap p{font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:70%}
  .feat{flex-direction:column}.feat .pic{width:100%;height:160px}
  .tabs button{padding:0 12px;font-size:14px}
  .svc li{grid-template-columns:1fr auto}.svc .ic{display:none}
  .steps{grid-template-columns:repeat(2,1fr)}
  .steps li::after{display:none}
  .tiles{grid-template-columns:repeat(2,1fr);gap:10px}
  .honor{grid-template-columns:repeat(2,1fr)}
  .quick{grid-template-columns:repeat(4,1fr);padding:18px 4px}
  .quick i{width:50px;height:50px}.quick svg{width:24px;height:24px}
  .quick a{font-size:12px}
  .foot-links .wrap{grid-template-columns:1fr 1fr}
  .foot .wrap{grid-template-columns:1fr;text-align:center;gap:16px}
  .foot .logo{justify-content:center}
  .copy .wrap{flex-direction:column;text-align:center}
  .float{display:none}
  .mbar{display:grid;grid-template-columns:1fr 1fr 1fr;position:fixed;left:0;right:0;bottom:0;height:56px;z-index:70;background:#fff;box-shadow:0 -2px 10px rgba(0,0,0,.1)}
  .mbar a{display:flex;align-items:center;justify-content:center;gap:6px;font-weight:600}
  .mbar a:nth-child(2){background:var(--blue);color:#fff}
  .mbar a:nth-child(3){background:#ffb400;color:var(--blue-deep)}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* ================= v3 补充与修正 ================= */
.grid>*{min-width:0}                 /* 防止长标题撑出屏幕（老站手机端错位的主因之一） */
.list a{min-width:0}
ol.steps{list-style:none}
.feat + .list li:first-child{display:none}   /* 头条已单独展示，列表跳过第一篇 */
.empty{color:var(--muted);font-size:13px;padding:18px 0;text-align:center}
.logo h1{white-space:nowrap}
.cities span{white-space:nowrap}
.honor .pic{background:#fff}
.honor .pic img{object-fit:contain}
.links{margin-top:22px;background:#fff;border:1px solid var(--line);padding:12px 18px;font-size:13px}
.links b{color:var(--blue);margin-right:10px}
.links a{margin-right:16px;color:#555}
.price .ask{color:var(--blue);font-size:18px;font-weight:700}

@media (max-width:768px){
  body{padding-bottom:calc(56px + env(safe-area-inset-bottom,0px))}
  .head{padding-top:env(safe-area-inset-top,0px)}
  .nav{top:env(safe-area-inset-top,0px)}
  .logo{gap:10px}
  .logo h1{font-size:18px;letter-spacing:0}
  .head-r .row{gap:10px}
  .nav .sub{display:block;background:rgba(0,0,0,.12)}
  .nav .sub a{color:#fff;text-align:left;padding-left:36px;border-color:rgba(255,255,255,.1)}
  .btn{padding:9px 18px;font-size:14px}
  .btn-o{margin-left:6px}
  .foot .qr .code{margin:0 auto 6px}
  .mbar{height:calc(56px + env(safe-area-inset-bottom,0px));padding-bottom:env(safe-area-inset-bottom,0px)}
}
@media (max-width:380px){ .logo h1{font-size:16px} .logo-mark{width:38px;height:38px} }
/* 轮播底色按顺序循环三种 */
.banner .slide:nth-of-type(3n+1){background:linear-gradient(115deg,#0f2463 0%,#1f45a8 55%,#5d8ae0 100%)}
.banner .slide:nth-of-type(3n+2){background:linear-gradient(115deg,#123a7a 0%,#2a64b8 60%,#8db5ec 100%)}
.banner .slide:nth-of-type(3n+3){background:linear-gradient(115deg,#1a2f78 0%,#3452b5 55%,#a5b8ea 100%)}
/* 轮播右侧插图：有图显示图，无图显示 DNA 图形 */
.slide-art{flex:none;width:420px;height:360px;position:relative}
.slide-art img{width:100%;height:100%;object-fit:contain}
.slide-art img + .helix{display:none}
.slide-art .helix{width:100%;height:100%}
@media (max-width:1100px){.slide-art{width:320px;height:274px}}
@media (max-width:768px){.slide-art{display:none}}
/* 文字区自适应，避免被插图挤压换行 */
.slide-txt{flex:1;min-width:0;padding-right:24px}
.slide-txt h2{white-space:nowrap}
@media (max-width:768px){.slide-txt h2{white-space:normal}}

/* ========== v3.2 鉴定项目规格、亲缘鉴定专区 ========== */
.svc .spec{margin-top:6px;display:flex;flex-wrap:wrap;gap:6px}
.svc .spec span{font-size:12px;color:var(--blue);background:var(--blue-soft);padding:1px 8px;border-radius:2px}
.svc li{align-items:start}
.svc .price{padding-top:4px}
.kin-intro{display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center;padding-bottom:16px;border-bottom:1px dashed var(--line);margin-bottom:18px}
.kin-intro p{font-size:14px;color:#4a5160;line-height:1.9}
.kin-use{display:flex;flex-wrap:wrap;gap:8px;max-width:320px;justify-content:flex-end}
.kin-use b{width:100%;text-align:right;font-size:13px;color:var(--blue)}
.kin-use span{font-size:13px;padding:4px 12px;border:1px solid var(--blue);color:var(--blue);border-radius:2px;white-space:nowrap}
.kin-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.kin-grid li{border:1px solid var(--line);background:linear-gradient(180deg,#fff,#f5f8fd);padding:20px 18px;position:relative;transition:border-color .2s,box-shadow .2s}
.kin-grid li:hover{border-color:var(--blue);box-shadow:0 8px 20px rgba(31,69,168,.1)}
.kin-grid li::before{content:"";position:absolute;left:0;top:0;width:100%;height:3px;background:var(--blue)}
.kin-grid i{width:52px;height:52px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center;margin-bottom:12px;box-shadow:0 0 0 5px var(--blue-soft)}
.kin-grid i svg{width:30px;height:30px}
.kin-grid h4{font-size:16px;margin-bottom:4px}
.kin-grid em{font-style:normal;display:inline-block;font-size:12px;color:var(--blue-deep);background:#ffe7a8;padding:0 8px;border-radius:2px;margin-bottom:8px}
.kin-grid p{font-size:13px;color:#5a6172;line-height:1.7}
.kin-note{margin-top:14px;font-size:12px;color:var(--muted);padding-left:10px;border-left:3px solid #ffb400;line-height:1.7}
@media (max-width:1100px){.kin-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:768px){
  .kin-intro{grid-template-columns:1fr}
  .kin-use{justify-content:flex-start;max-width:none}.kin-use b{text-align:left}
  .kin-grid{grid-template-columns:1fr 1fr;gap:10px}
  .kin-grid li{padding:14px 12px}
  .svc .spec span{font-size:11px}
}
@media (max-width:420px){.kin-grid{grid-template-columns:1fr}}
.svc-extra{margin-top:10px;padding:12px 14px;background:var(--bg);font-size:13px;color:#4a5160;line-height:1.9}
.svc-extra b{color:var(--blue);margin-right:10px}
.kin-use{max-width:440px}