/* ============================================================
   内蒙古鼎域承锋物流科技有限公司 · 官网样式
   设计基线：由参考稿量化校准（1440 容器 / 顶栏30 / 导航72 / CTA388）
   ============================================================ */
:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --accent:#10b981;          /* 绿色运力 / 低碳 */
  --accent-light:#34d399;
  --foreground:#0f172a;
  --muted:#f1f5f9;
  --muted-foreground:#64748b;
  --border:#e2e8f0;
  --slate-900:#0f172a;
  --navy:#131c31;
  --footer:#0b1322;
  --radius:0.5rem;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{-webkit-text-size-adjust:100%;font-size:17px;}
body{font-family:'Inter','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;background:#fff;color:var(--foreground);line-height:1.7;-webkit-font-smoothing:antialiased;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
.container{max-width:1440px;margin:0 auto;padding:0 2rem;}

/* ---------- 顶栏 ---------- */
.topbar{background:var(--slate-900);color:#94a3b8;font-size:0.7rem;padding:0.25rem 0;display:none;}
.topbar .container{display:flex;justify-content:space-between;align-items:center;gap:0.75rem;}
.topbar-left{display:flex;align-items:center;gap:1.5rem;}
.topbar-left span{display:inline-flex;align-items:center;gap:0.4rem;}
.topbar-left a{color:#cbd5e1;transition:color .2s;}
.topbar-left a:hover{color:#fff;}
.topbar-right{display:flex;align-items:center;gap:1.1rem;}
.topbar-right a{color:#cbd5e1;transition:color .2s;}
.topbar-right a:hover{color:#fff;}
.topbar-right .mini-btn{background:var(--primary);color:#fff;padding:0.1rem 0.6rem;border-radius:0.3rem;font-weight:600;line-height:1.5;}
.topbar-right .mini-btn:hover{background:var(--primary-dark);color:#fff;}
@media(min-width:768px){.topbar{display:block;}}

/* ---------- 头部（深蓝半透明，叠加在 banner 之上） ---------- */
header.site-header{position:sticky;top:0;z-index:60;width:100%;background:rgba(19,28,50,.9);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);transition:box-shadow .3s,background .3s;}
header.site-header.scrolled{background:rgba(19,28,50,.96);box-shadow:0 1px 3px rgba(0,0,0,.28);}
.nav-wrap{display:flex;align-items:center;gap:4.5rem;height:4.25rem;}
header .brand .txt b{color:#fff;}
header .brand .txt i{color:rgba(148,163,184,.9);}
.brand{display:flex;align-items:center;gap:0.6rem;}
.brand .mark{width:2rem;height:2rem;border-radius:0.55rem;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:#fff;flex:none;}
.brand .txt{display:flex;flex-direction:column;line-height:1.15;}
.brand .txt b{font-weight:700;font-size:1.2rem;color:var(--slate-900);letter-spacing:0.01em;}
.brand .txt i{font-style:normal;font-size:0.6rem;color:#94a3b8;letter-spacing:0.16em;text-transform:uppercase;}
.nav-links{display:none;align-items:center;align-self:stretch;height:4.25rem;}
.nav-links a{display:flex;align-items:center;justify-content:center;width:7.5rem;height:100%;font-size:0.95rem;font-weight:500;color:rgba(255,255,255,.8);border-bottom:3px solid transparent;transition:color .2s,background .2s;}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,.07);}
.nav-links a.active{color:#fff;font-weight:600;background:#2563eb;border-bottom-color:#fff;}
.header-actions{display:none;align-items:center;gap:1.1rem;margin-left:auto;}
.header-actions .tel{font-size:0.9rem;font-weight:600;color:rgba(255,255,255,.88);display:inline-flex;align-items:center;gap:0.35rem;transition:color .2s;}
.header-actions .tel svg{color:#93c5fd;}
.header-actions .tel:hover{color:#fff;}
.header-actions .btn-primary{height:2.35rem;padding:0 1.15rem;font-size:0.82rem;font-weight:600;line-height:1;border-radius:4px;}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:0.5rem;font-size:1rem;font-weight:600;padding:0.65rem 1.4rem;border-radius:var(--radius);transition:all .2s;cursor:pointer;border:1px solid transparent;}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 1px 2px rgba(0,0,0,.05);}
.btn-primary:hover{background:var(--primary-dark);}
.btn-outline-white{background:transparent;color:#fff;border-color:rgba(255,255,255,.65);}
.btn-outline-white:hover{border-color:#fff;background:rgba(255,255,255,.1);}
.btn-outline{background:#fff;color:var(--primary);border-color:#c7d7fe;}
.btn-outline:hover{background:#eff6ff;border-color:var(--primary);}
.btn-white{background:#fff;color:var(--primary);}
.btn-white:hover{background:#eff6ff;}
.btn-lg{padding:0.85rem 1.8rem;font-size:1.05rem;}
.hamburger{display:inline-flex;padding:0.5rem;color:#fff;background:none;border:0;cursor:pointer;margin-left:auto;}
@media(min-width:992px){.nav-links{display:flex;}.header-actions{display:flex;}.hamburger{display:none;}}
.mobile-menu{display:none;border-top:1px solid var(--border);background:#fff;}
.mobile-menu.open{display:block;}
.mobile-menu .container{padding-top:0.75rem;padding-bottom:1rem;display:flex;flex-direction:column;gap:0.15rem;}
.mobile-menu a{padding:0.55rem 0;color:#475569;font-weight:500;}
.mobile-menu a.active{color:var(--primary);font-weight:600;}
.mobile-menu .btn{margin-top:0.6rem;}

/* ---------- 首屏 Hero（首页） ----------
   高度 = 视口宽 × (748/1920)，与图片比例一致：任何宽度下图片都 1:1 完整显示（不放大、不裁切）；
   窄屏用 min-height 兜底，保证文字有足够空间 */
.hero{position:relative;color:#fff;overflow:hidden;margin-top:-4.25rem;display:flex;align-items:center;}
.hero .container{width:100%;}
.hero-bg{position:absolute;inset:0;background:
  linear-gradient(90deg,rgba(8,14,28,.92) 0%,rgba(8,14,28,.72) 45%,rgba(8,14,28,.42) 100%),
  url('images/banner-home.jpg') center/cover no-repeat,
  linear-gradient(135deg,#0b1322,#1e3a8a);}
.hero-inner{position:relative;padding:5rem 0 4.5rem;max-width:46rem;}
@media(min-width:768px){.hero{height:calc(100vw * 748 / 1920);min-height:44rem;}.hero-inner{padding:6rem 0 5.5rem;}}
.hero-tag{display:inline-flex;align-items:center;gap:0.45rem;background:rgba(37,99,235,.25);border:1px solid rgba(96,165,250,.4);color:#bfdbfe;font-size:0.8rem;font-weight:600;padding:0.35rem 0.9rem;border-radius:999px;margin-bottom:1.4rem;}
.hero h1{font-size:2.4rem;line-height:1.18;font-weight:800;letter-spacing:-0.01em;margin-bottom:1.15rem;}
@media(min-width:768px){.hero h1{font-size:2.9rem;}}
@media(min-width:1024px){.hero h1{font-size:3.05rem;}}
.hero h1 em{font-style:normal;color:var(--accent-light);}
.hero p.lead{color:#cbd5e1;font-size:1.06rem;max-width:36rem;margin-bottom:2.1rem;}
.hero-cta{display:flex;flex-wrap:wrap;gap:0.9rem;margin-bottom:2.2rem;}
.hero-feats{display:flex;flex-wrap:wrap;gap:1.6rem;}
.hero-feats span{display:inline-flex;align-items:center;gap:0.45rem;font-size:0.85rem;color:#e2e8f0;}
.hero-feats svg{color:#60a5fa;}

/* ---------- 内页 Banner：大背景图 + 蓝色信息块 ---------- */
.page-hero{position:relative;color:#fff;overflow:hidden;background:#0b1a3a;margin-top:-4.25rem;}
.page-hero .ph-bg{position:absolute;inset:0;background-size:cover;background-position:center;background-repeat:no-repeat;}
.page-hero .container{position:relative;}
.ph-left{position:relative;padding:7.2rem 0 4.4rem;max-width:34rem;}
.crumb{font-size:0.82rem;color:rgba(226,236,255,.75);margin-bottom:1.9rem;display:flex;align-items:center;gap:0.45rem;}
.crumb a{color:rgba(226,236,255,.75);transition:color .2s;}
.crumb a:hover{color:#fff;}
.crumb span{color:rgba(226,236,255,.45);}
.kicker{font-size:2.3rem;line-height:1.1;font-weight:300;letter-spacing:0.06em;text-transform:uppercase;color:rgba(255,255,255,.95);}
.page-hero .rule{display:block;width:3rem;height:2px;background:rgba(255,255,255,.5);margin:1.3rem 0 1.5rem;}
.page-hero h1{font-size:2.35rem;font-weight:800;line-height:1.25;letter-spacing:0.03em;margin-bottom:2rem;}
.side-nav{list-style:none;display:flex;flex-direction:column;}
.side-nav li{border-top:1px solid rgba(255,255,255,.16);}
.side-nav a{display:block;position:relative;padding:0.8rem 0;font-size:0.98rem;color:rgba(255,255,255,.72);transition:color .22s,padding .22s;}
.side-nav a::before{content:"";position:absolute;left:0;top:50%;width:0;height:2px;background:#fff;border-radius:2px;transform:translateY(-50%);transition:width .22s;}
.side-nav a:hover,.side-nav a.active{color:#fff;}
.side-nav a:hover{padding-left:1.15rem;}
.side-nav a:hover::before{width:0.7rem;}
.page-hero .panel{position:relative;background:rgba(23,63,143,.9);backdrop-filter:blur(18px) saturate(130%);-webkit-backdrop-filter:blur(18px) saturate(130%);border-top-left-radius:2.2rem;padding:2.9rem 2.2rem 3rem;box-shadow:0 -18px 40px -30px rgba(0,0,0,.6);}
.page-hero .panel p{font-size:0.98rem;line-height:1.75;color:#eaf1ff;margin-bottom:1.8rem;}
.page-hero .panel .no{position:absolute;right:1.1rem;bottom:-1.7rem;font-size:6.5rem;font-weight:800;line-height:1;color:rgba(255,255,255,.14);letter-spacing:-0.03em;pointer-events:none;user-select:none;}
section[id],.kv .item[id],.platform[id]{scroll-margin-top:5.6rem;}
@media(min-width:1100px){
  .page-hero{height:calc(100vw * 779 / 1920);min-height:45.85rem;}
  .ph-left{padding:9.6rem 0 6.7rem;}
  .page-hero .panel{position:absolute;right:0;bottom:0;width:min(46rem,56%);padding:3.2rem 3.6rem 3.5rem 4.2rem;border-top-left-radius:2.8rem;}
  .page-hero .panel p{font-size:1rem;}
}

/* ---------- 要素横带 ---------- */
.logos-band{padding:2.9rem 0 3rem;text-align:center;}
.logos-band .label{font-size:0.8rem;color:#94a3b8;margin-bottom:1.2rem;}
.logos{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:1.5rem 2.5rem;}
.logos .logo{display:inline-flex;align-items:center;gap:0.5rem;font-weight:600;font-size:1.02rem;color:#475569;}
.logos .logo svg{color:var(--accent);}

/* ---------- 通用区块 ---------- */
section.block{padding:4.5rem 0;}
section.block.pt0{padding-top:0;}
.section-head{text-align:center;max-width:52rem;margin:0 auto 3.5rem;}
.section-head h2{font-size:2rem;font-weight:800;letter-spacing:-0.01em;color:var(--slate-900);margin-bottom:0.7rem;}
.section-head p{color:var(--muted-foreground);font-size:1rem;}
.section-head p.tight{max-width:50rem;margin:0.4rem auto 0;}
.section-foot{margin-top:2.4rem;text-align:center;}

/* ---------- 卡片（三/四宫格） ---------- */
.features{display:grid;grid-template-columns:1fr;gap:1.5rem;}
@media(min-width:768px){.features{grid-template-columns:repeat(3,1fr);}}
.feature{background:var(--muted);border:1px solid #eef2f7;border-radius:0.9rem;padding:1.9rem;transition:all .25s;}
.feature:hover{box-shadow:0 16px 36px -20px rgba(37,99,235,.4);transform:translateY(-4px);background:#fff;border-color:#dbeafe;}
.feature .ico{width:2.3rem;height:2.3rem;border-radius:0.65rem;background:#fff;border:1px solid #dbeafe;color:var(--primary);display:flex;align-items:center;justify-content:center;margin-bottom:0.95rem;}
.feature h3{font-size:1.15rem;font-weight:700;line-height:1.4;color:var(--slate-900);margin-bottom:0.5rem;}
.feature p{color:var(--muted-foreground);font-size:0.85rem;line-height:1.55;}
.feature.green .ico{color:var(--accent);border-color:#d1fae5;}
.features.two{grid-template-columns:1fr;}
@media(min-width:768px){.features.two{grid-template-columns:repeat(2,1fr);}}

/* ---------- 平台卡片 ---------- */
.platforms{display:grid;grid-template-columns:1fr;gap:1.4rem;}
@media(min-width:900px){.platforms{grid-template-columns:repeat(2,1fr);}}
.platform{position:relative;background:#fff;border:1px solid var(--border);border-radius:0.9rem;padding:2rem 2rem 2.1rem;transition:all .25s;overflow:hidden;}
.platform::after{content:"";position:absolute;left:0;top:0;height:100%;width:3px;background:linear-gradient(180deg,var(--primary),var(--accent));opacity:0;transition:opacity .25s;}
.platform:hover{border-color:#dbeafe;box-shadow:0 20px 40px -26px rgba(15,23,42,.35);transform:translateY(-4px);}
.platform:hover::after{opacity:1;}
.platform .top{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:1rem;}
.platform .ico{width:2.6rem;height:2.6rem;border-radius:0.7rem;background:#eff6ff;color:var(--primary);display:flex;align-items:center;justify-content:center;flex:none;}
.platform .no{font-size:1.6rem;font-weight:800;color:#e2e8f0;letter-spacing:0.02em;line-height:1;}
.platform h3{font-size:1.25rem;font-weight:700;line-height:1.4;color:var(--slate-900);margin-bottom:0.55rem;display:flex;align-items:center;gap:0.6rem;flex-wrap:wrap;}
.platform .tag{display:inline-block;font-size:0.75rem;font-weight:600;color:var(--primary);background:#eff6ff;border-radius:999px;padding:0.15rem 0.6rem;font-weight:600;}
.platform p{color:var(--muted-foreground);font-size:0.88rem;line-height:1.62;}
.platform.green .ico{background:#ecfdf5;color:var(--accent);}
.platform.green .tag{color:#047857;background:#ecfdf5;}

/* ---------- 深色带（全过程体系） ---------- */
.stats-band{background:var(--navy);color:#fff;padding:3.7rem 0;}
.stats-title{text-align:center;color:#94a3b8;font-size:0.9rem;margin-bottom:2.2rem;}
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:2.4rem 1rem;text-align:center;}
@media(min-width:768px){.stats{grid-template-columns:repeat(4,1fr);}}
.stats .num{font-size:2.2rem;font-weight:800;line-height:1.4;color:#3b82f6;letter-spacing:-0.01em;}
@media(min-width:768px){.stats .num{font-size:2.4rem;}}
.stats .lab{color:#94a3b8;font-size:0.9rem;line-height:1.5;margin-top:0.35rem;}

/* ---------- 关于我们：图文块 ---------- */
.about-grid{display:grid;grid-template-columns:1fr;gap:2.5rem;align-items:center;}
@media(min-width:900px){.about-grid{grid-template-columns:1.15fr 1fr;gap:3.5rem;}}
.about-grid h2{font-size:2rem;font-weight:800;letter-spacing:-0.01em;color:var(--slate-900);margin-bottom:1.1rem;}
.about-grid p{color:var(--muted-foreground);font-size:0.98rem;line-height:1.85;margin-bottom:1rem;}
.about-grid .pic{border-radius:1rem;overflow:hidden;background:linear-gradient(160deg,#1e293b,#0f172a);aspect-ratio:4/3;position:relative;}
.about-grid .pic img{width:100%;height:100%;object-fit:cover;}

/* ---------- 关键信息列表 ---------- */
.kv{display:grid;grid-template-columns:1fr;gap:1.2rem;margin-top:2.6rem;}
@media(min-width:768px){.kv{grid-template-columns:repeat(3,1fr);}}
.kv .item{background:var(--muted);border:1px solid #eef2f7;border-radius:0.9rem;padding:1.6rem 1.7rem;}
.kv .item b{display:block;font-size:0.85rem;font-weight:600;color:var(--primary);letter-spacing:0.04em;margin-bottom:0.45rem;}
.kv .item span{color:var(--slate-900);font-size:1rem;font-weight:600;line-height:1.6;}
.kv .item.green b{color:#047857;}

/* ---------- CTA（通栏） ---------- */
.cta-wrap{padding:0;background:linear-gradient(135deg,#2563eb 0%,#1d4ed8 60%,#1e40af 100%);position:relative;overflow:hidden;color:#fff;text-align:center;}
.cta-wrap::before{content:"";position:absolute;inset:0;background:
  linear-gradient(to top right,transparent calc(50% - 1px),rgba(255,255,255,.16) calc(50% - 1px),rgba(255,255,255,.16) calc(50% + 1px),transparent calc(50% + 1px)),
  linear-gradient(to bottom right,transparent calc(50% - 1px),rgba(255,255,255,.16) calc(50% - 1px),rgba(255,255,255,.16) calc(50% + 1px),transparent calc(50% + 1px));}
.cta-wrap>.container{position:relative;padding-top:4.7rem;padding-bottom:4.7rem;}
.cta-wrap h2{font-size:2.6rem;font-weight:800;line-height:1.35;letter-spacing:-0.01em;margin-bottom:0.9rem;}
.cta-wrap p{color:#dbeafe;max-width:34rem;margin:0 auto 2rem;font-size:1rem;}
.cta-wrap .btns{display:flex;gap:0.9rem;justify-content:center;flex-wrap:wrap;}

/* ---------- 页脚 ---------- */
footer.site-footer{background:var(--footer);color:#94a3b8;padding:3.75rem 0 1.5rem;}
.foot-grid{display:grid;grid-template-columns:1fr;gap:2.5rem;}
@media(min-width:768px){.foot-grid{grid-template-columns:1.6fr 1fr 1fr 1.1fr;}}
.foot-brand .brand .txt b{color:#fff;}
.foot-brand .brand .txt i{color:#64748b;}
.foot-brand p{color:#64748b;font-size:0.92rem;line-height:1.7;margin:1rem 0 1.3rem;max-width:24rem;}
.socials{display:flex;gap:0.55rem;}
.socials a{width:2rem;height:2rem;border-radius:0.45rem;background:#1a2337;display:flex;align-items:center;justify-content:center;color:#cbd5e1;transition:background .2s;}
.socials a:hover{background:var(--primary);color:#fff;}
.foot-col h3{color:#fff;font-weight:600;font-size:1rem;line-height:1.4;margin-bottom:1.1rem;}
.foot-col ul{list-style:none;display:flex;flex-direction:column;gap:0.45rem;}
.foot-col a{color:#64748b;font-size:0.9rem;line-height:1.45;transition:color .2s;}
.foot-col a:hover{color:#3b82f6;}
.foot-col a.active{color:#3b82f6;}
.foot-contact li{color:#94a3b8;font-size:0.9rem;line-height:1.6;display:flex;gap:0.5rem;align-items:flex-start;}
.foot-contact li svg{margin-top:0.3rem;flex:none;color:#3b82f6;}
.foot-contact .tel{color:#fff;font-weight:700;font-size:1.1rem;letter-spacing:0.02em;}
.foot-bottom{border-top:1px solid #1a2337;margin-top:1.4rem;padding-top:1.1rem;display:flex;flex-direction:column;gap:1rem;align-items:center;justify-content:space-between;}
@media(min-width:768px){.foot-bottom{flex-direction:row;}}
.foot-bottom p{font-size:0.82rem;color:#475569;}
.foot-bottom p a{color:#64748b;text-decoration:none;}
.foot-bottom p a:hover{color:#3b82f6;text-decoration:underline;}

/* ---------- 浮动按钮 ---------- */
.float-consult{position:fixed;right:1.25rem;bottom:1.25rem;z-index:60;display:inline-flex;align-items:center;gap:0.45rem;background:var(--primary);color:#fff;font-size:0.85rem;font-weight:600;padding:0.6rem 1.05rem;border-radius:999px;box-shadow:0 10px 25px -8px rgba(37,99,235,.7);transition:background .2s;}
.float-consult:hover{background:var(--primary-dark);}