/* ===== 南京大黑牛官网 · 基础 ===== */
:root{
  --navy:#1F4C6B;
  --navy-dark:#0B2237;
  --navy-deep:#08192A;
  --red:#D14E5B;
  --red-light:#E4798A;
  --ink:#24313D;
  --muted:#68798A;
  --line:#E1E7ED;
  --tint:#F4F7FA;
  --white:#FFFFFF;
  --radius:12px;
  --shadow:0 10px 32px rgba(16,48,76,.08);
  --shadow-hover:0 18px 42px rgba(16,48,76,.14);
  --maxw:1200px;
  --header-h:76px;
  --font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:var(--header-h);-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--white);line-height:1.75;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
h1,h2,h3,h4,p,figure,ol,ul{margin:0}
ul,ol{list-style:none;padding:0}
:focus-visible{outline:3px solid var(--red);outline-offset:3px}
.svg-sprite{position:absolute;width:0;height:0;overflow:hidden}
.icon,.card-icon svg,.browser-bar svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--navy);color:#fff;padding:12px 20px;z-index:999}
.skip-link:focus{left:12px;top:12px}
.container{width:min(100% - 48px,var(--maxw));margin-inline:auto}

/* ===== 通用区块 ===== */
.section{padding:104px 0;scroll-margin-top:var(--header-h)}
.section-tint{background:var(--tint)}
.section-dark{background:var(--navy-dark);color:#fff}
.section-head{max-width:820px;margin-bottom:52px}
.eyebrow{font-size:13px;font-weight:700;letter-spacing:.22em;color:var(--red);text-transform:uppercase;margin-bottom:16px}
.eyebrow-light{color:var(--red-light)}
.section-head h2{font-size:clamp(28px,3.4vw,42px);line-height:1.32;color:var(--navy);letter-spacing:.01em}
.section-dark .section-head h2{color:#fff}
.lead{margin-top:16px;font-size:17px;color:var(--muted);line-height:1.9}
.section-dark .lead{color:#A9BECD}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:14px 26px;border-radius:6px;font-size:16px;font-weight:600;border:1px solid transparent;transition:transform .25s,background .25s,border-color .25s,box-shadow .25s;white-space:nowrap}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--red);color:#fff;box-shadow:0 8px 22px rgba(209,78,91,.24)}
.btn-primary:hover{background:#B93E4B;box-shadow:0 12px 28px rgba(209,78,91,.32)}
.btn-ghost{border-color:rgba(255,255,255,.45);color:#fff;background:rgba(255,255,255,.05)}
.btn-ghost:hover{background:rgba(255,255,255,.14);border-color:#fff}
.btn-outline{border-color:rgba(255,255,255,.4);color:#fff;background:transparent}
.btn-outline:hover{background:rgba(255,255,255,.12)}

/* ===== 顶部导航 ===== */
.site-header{position:fixed;inset:0 0 auto;height:var(--header-h);background:rgba(255,255,255,.96);backdrop-filter:blur(12px);z-index:100;border-bottom:1px solid rgba(225,231,237,.9);transition:box-shadow .3s,background .3s}
.site-header.scrolled{box-shadow:0 6px 24px rgba(11,34,55,.10);background:#fff}
.nav-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:12px;flex:none}
.brand-mark{width:44px;height:44px;display:grid;place-items:center;background:#fff;border-radius:10px;overflow:hidden}
.brand-mark img{width:44px;height:44px;object-fit:contain}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text strong{font-size:19px;color:var(--navy);letter-spacing:.04em}
.brand-text small{font-size:10px;letter-spacing:.16em;color:#8A9AAA}
.nav-links{display:flex;align-items:center;gap:18px}
.nav-links a{font-size:15px;color:#42576A;position:relative;padding:8px 0;transition:color .2s}
.nav-links a::after{content:"";position:absolute;left:0;right:100%;bottom:2px;height:2px;background:var(--red);transition:right .25s}
.nav-links a:hover,.nav-links a.active{color:var(--navy)}
.nav-links a:hover::after,.nav-links a.active::after{right:0}
.nav-links .nav-cta{background:var(--navy);color:#fff;padding:10px 20px;border-radius:6px;font-weight:600}
.nav-links .nav-cta::after{display:none}
.nav-links .nav-cta:hover{background:var(--navy-dark);color:#fff}
.nav-toggle{display:none;width:44px;height:44px;border:0;background:transparent;padding:10px;flex-direction:column;justify-content:center;gap:5px}
.nav-toggle span{display:block;height:2px;width:100%;background:var(--navy);border-radius:2px;transition:transform .3s,opacity .3s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== Hero ===== */
.hero{position:relative;min-height:100svh;display:flex;flex-direction:column;justify-content:center;padding-top:var(--header-h);color:#fff;overflow:hidden;isolation:isolate}
.hero-bg{position:absolute;inset:0;background:url("../img/hero-bg.jpg") center/cover no-repeat;opacity:.95;z-index:-2}
.hero-overlay{position:absolute;inset:0;z-index:-1;background:linear-gradient(90deg,rgba(6,22,39,.97) 0%,rgba(8,27,46,.90) 42%,rgba(8,27,46,.42) 100%),linear-gradient(0deg,rgba(6,22,39,.75) 0%,transparent 45%)}
.hero-inner{flex:1;display:flex;flex-direction:column;justify-content:center;padding:72px 0 56px;position:relative;z-index:1}
.hero h1{font-size:clamp(42px,6.4vw,80px);line-height:1.18;font-weight:800;letter-spacing:.02em;margin:8px 0 26px}
.hero h1 span{color:var(--red-light)}
.hero-sub{font-size:clamp(16px,1.6vw,20px);line-height:1.9;color:#CFDCE6;max-width:680px}
.hero-actions{display:flex;flex-wrap:wrap;gap:16px;margin-top:38px}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:44px}
.hero-badges span{font-size:14px;color:#DCE8F0;border:1px solid rgba(255,255,255,.28);background:rgba(255,255,255,.05);padding:8px 16px;border-radius:4px;letter-spacing:.04em}
.hero-stats{position:relative;z-index:1;background:rgba(4,18,32,.55);border-top:1px solid rgba(255,255,255,.14);backdrop-filter:blur(6px)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.stat{padding:26px 10px 28px;text-align:center;border-right:1px solid rgba(255,255,255,.12)}
.stat:last-child{border-right:0}
.stat strong{display:block;font-size:clamp(30px,3.6vw,44px);line-height:1.2;color:#fff;font-weight:800;letter-spacing:.01em}
.stat span{font-size:14px;color:#A9BECD}

/* ===== 关于 ===== */
.about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:start}
.about-copy p{font-size:16.5px;line-height:2.05;color:#43576A;margin-bottom:18px}
.about-copy strong{color:var(--navy)}
.cert-chips{display:flex;flex-wrap:wrap;gap:10px;margin:28px 0 22px}
.cert-chips span{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--navy);background:#EAF1F6;border:1px solid #D8E4EC;border-radius:4px;padding:8px 14px}
.cert-chips .icon{width:15px;height:15px;color:var(--red)}
.text-link{display:inline-flex;align-items:center;gap:8px;font-size:15.5px;color:var(--red);font-weight:600;border-bottom:1px solid rgba(209,78,91,.35);padding-bottom:4px;transition:gap .2s}
.text-link:hover{gap:14px}
.timeline{position:relative;padding-left:6px}
.timeline::before{content:"";position:absolute;left:9px;top:12px;bottom:16px;width:2px;background:linear-gradient(180deg,var(--red) 0%,#C8D6E0 100%)}
.tl-item{position:relative;padding-left:42px;padding-bottom:30px}
.tl-item:last-child{padding-bottom:0}
.tl-item::before{content:"";position:absolute;left:2px;top:8px;width:16px;height:16px;border-radius:50%;background:#fff;border:3px solid var(--red);box-shadow:0 0 0 4px rgba(209,78,91,.10)}
.tl-item:not(:first-child)::before{border-color:var(--navy);box-shadow:0 0 0 4px rgba(31,76,107,.10)}
.tl-year{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.1em;color:var(--red);margin-bottom:4px}
.tl-item h3{font-size:20px;color:var(--navy);margin-bottom:6px}
.tl-item p{font-size:15px;color:var(--muted);line-height:1.8}

/* ===== 产品卡片 ===== */
.cards-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 28px 28px;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s,border-color .3s;position:relative;overflow:hidden}
.card::before{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:var(--red);transition:width .35s}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:#CBD9E4}
.card:hover::before{width:100%}
.card-top{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:22px}
.card-icon{width:52px;height:52px;border-radius:10px;background:#EAF1F6;color:var(--navy);display:grid;place-items:center}
.card-icon svg{width:27px;height:27px;stroke-width:1.6}
.card-no{font-size:13px;font-weight:700;letter-spacing:.14em;color:#B6C4D0}
.card h3{font-size:21px;color:var(--navy);margin-bottom:12px;line-height:1.4}
.card p{font-size:15px;color:#5A6C7C;line-height:1.85;min-height:84px}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px;padding-top:18px;border-top:1px solid #EDF1F5}
.tags span{font-size:12.5px;color:var(--navy);background:#F2F6F9;border-radius:3px;padding:4px 10px}

/* ===== 技术能力 ===== */
.cap-grid{display:grid;grid-template-columns:1.45fr .75fr;gap:52px;align-items:start}
.cap-list{border-top:1px solid var(--line)}
.cap-row{display:flex;gap:22px;align-items:flex-start;padding:18px 4px;border-bottom:1px solid var(--line);transition:background .25s,padding-left .25s}
.cap-row:hover{background:var(--tint);padding-left:14px}
.cap-row>span{font-size:15px;font-weight:800;color:var(--red);letter-spacing:.08em;padding-top:3px;flex:none;width:30px}
.cap-row h3{font-size:19px;color:var(--navy);line-height:1.4}
.cap-row p{font-size:15px;color:var(--muted);margin-top:2px}
.cap-side{background:var(--navy-dark);color:#fff;border-radius:var(--radius);padding:34px 30px}
.cap-side h3{font-size:24px;margin-bottom:22px}
.stack-tags{display:flex;flex-wrap:wrap;gap:9px}
.stack-tags span{font-size:13.5px;color:#DCE8F0;border:1px solid rgba(255,255,255,.22);border-radius:4px;padding:7px 12px}
.side-note{margin-top:30px;padding-top:24px;border-top:1px solid rgba(255,255,255,.18)}
.side-note strong{font-size:16px;color:var(--red-light)}
.side-note p{font-size:14.5px;color:#B9CBD8;line-height:1.9;margin-top:8px}

/* ===== 产品界面切换 ===== */
.showcase{margin-top:88px}
.showcase-head{margin-bottom:30px}
.showcase-head h2{font-size:clamp(26px,3vw,34px);color:var(--navy)}
.showcase-body{display:grid;grid-template-columns:270px 1fr;gap:24px;align-items:start}
.showcase-tabs{display:flex;flex-direction:column;gap:8px}
.showcase-tab{text-align:left;border:1px solid var(--line);background:#fff;border-radius:8px;padding:15px 18px;font-size:15.5px;color:#4C6072;transition:all .25s;position:relative}
.showcase-tab:hover{border-color:#B9CBD8;color:var(--navy)}
.showcase-tab.active{background:var(--navy);border-color:var(--navy);color:#fff;font-weight:600;box-shadow:0 8px 20px rgba(31,76,107,.18)}
.showcase-tab.active::after{content:"";position:absolute;right:14px;top:50%;width:6px;height:6px;border-radius:50%;background:var(--red-light);transform:translateY(-50%)}
.showcase-preview{margin:0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.browser-bar{height:38px;background:#EEF2F6;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:6px;padding:0 16px}
.browser-bar i{width:9px;height:9px;border-radius:50%;background:#C9D5DF;display:block}
.browser-bar i:first-child{background:#E58A94}
.browser-bar i:nth-child(2){background:#E8C47E}
.browser-bar i:nth-child(3){background:#8FC2A9}
.browser-bar span{font-size:12px;color:#8A9AAA;margin-left:12px}
.showcase-preview img{width:100%;aspect-ratio:16/8.6;object-fit:cover;object-position:top center;background:#F0F3F6;transition:opacity .25s}
.showcase-preview figcaption{padding:20px 24px 24px;border-top:1px solid var(--line)}
.showcase-preview h3{font-size:20px;color:var(--navy)}
.showcase-preview p{font-size:15px;color:var(--muted);margin-top:6px}

/* ===== 行业方案（深色） ===== */
.scene-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.scene-card{background:rgba(255,255,255,.055);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius);padding:32px 28px;transition:transform .3s,background .3s}
.scene-card:hover{transform:translateY(-5px);background:rgba(255,255,255,.09)}
.scene-card-accent{background:var(--red);border-color:var(--red)}
.scene-card-accent:hover{background:#C04350}
.scene-no{font-size:12px;letter-spacing:.18em;color:var(--red-light);font-weight:700}
.scene-card-accent .scene-no{color:#FFE3E7}
.scene-card h3{font-size:24px;margin:18px 0 16px;line-height:1.4}
.scene-card h3 small{display:block;font-size:16px;font-weight:400;color:#A9BECD;margin-top:6px}
.scene-card-accent h3 small{color:#FFE3E7}
.scene-card p{font-size:15px;color:#C6D6E2;line-height:1.9}
.scene-card-accent p{color:#FFF0F2}
.innovation{margin-top:66px;padding-top:48px;border-top:1px solid rgba(255,255,255,.14)}
.innovation-head{margin-bottom:28px}
.innovation-head h3{font-size:clamp(22px,2.5vw,28px)}
.innovation-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.inno-item{display:grid;grid-template-columns:44px 1fr;column-gap:16px;align-items:start;padding:20px 22px;background:rgba(255,255,255,.045);border:1px solid rgba(255,255,255,.10);border-radius:8px}
.inno-item>span{grid-row:span 2;font-size:20px;font-weight:800;color:var(--red-light)}
.inno-item h4{font-size:17px;color:#fff}
.inno-item p{font-size:14.5px;color:#AFC3D2;line-height:1.8;margin-top:6px}

/* ===== 团队 ===== */
.team-grid{display:grid;grid-template-columns:1.35fr 1fr;gap:24px}
.person-card{display:grid;grid-template-columns:170px 1fr;gap:26px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.person-primary{background:var(--tint);border-color:#DCE6EE}
.person-photo{border-radius:8px;overflow:hidden;background:#DFE8EF;align-self:start}
.person-photo img{width:100%;aspect-ratio:3/4;object-fit:cover;object-position:top center}
.person-avatar{display:flex;align-items:center;justify-content:center;aspect-ratio:3/4;background:linear-gradient(155deg,#2E6489,#1F4C6B)}
.person-avatar svg{width:58%;height:auto;display:block}
.person-card:nth-child(2) .person-avatar{background:linear-gradient(155deg,#5A819E,#315B7A)}
.person-role{font-size:13.5px;font-weight:700;color:var(--red);letter-spacing:.06em}
.person-body h3{font-size:27px;line-height:1.35;color:var(--navy);margin:4px 0 14px}
.person-body p{font-size:15px;color:#516577;line-height:1.9;margin-bottom:8px}
.person-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.person-tags span{font-size:12.5px;color:var(--navy);background:#fff;border:1px solid #CFDCE6;border-radius:3px;padding:5px 10px}
.team-bottom{display:grid;grid-template-columns:1fr 1.15fr;gap:24px;margin-top:24px}
.role-panel,.honor-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px}
.role-panel h3,.honor-panel h3{font-size:20px;color:var(--navy);margin-bottom:14px}
.role-panel p,.honor-panel p{font-size:15px;color:#516577;line-height:1.9}
.role-panel .muted{color:var(--muted);font-size:14px;margin-top:10px}
.cert-images{display:grid;grid-template-columns:1.35fr .65fr;gap:14px;margin-top:20px}
.cert-images figure{margin:0;border:1px solid var(--line);border-radius:6px;overflow:hidden;background:#F7F9FB}
.cert-images img{width:100%;height:150px;object-fit:cover;object-position:center}
.cert-images figcaption{font-size:12.5px;color:var(--muted);text-align:center;padding:8px 6px}

/* ===== 客户与服务 ===== */
.customer-wall{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.customer-wall img{width:100%;height:auto;border-radius:6px}
.service-block{margin-top:70px;display:grid;grid-template-columns:.8fr 1.6fr;gap:48px;align-items:start}
.service-head h3{font-size:clamp(22px,2.4vw,28px);color:var(--navy);margin-bottom:12px}
.service-head p{font-size:15px;color:var(--muted);line-height:1.9}
.service-steps{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;counter-reset:step}
.service-steps li{background:#fff;border:1px solid var(--line);border-top:3px solid var(--navy);border-radius:8px;padding:20px 16px;min-height:158px}
.service-steps li:last-child{border-top-color:var(--red)}
.service-steps li>span{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:#EAF1F6;color:var(--navy);font-weight:800;font-size:14px;margin-bottom:14px}
.service-steps li:last-child>span{background:#FBE9EB;color:var(--red)}
.service-steps strong{display:block;font-size:16px;color:var(--navy)}
.service-steps em{display:block;font-style:normal;font-size:13.5px;color:var(--muted);margin-top:8px;line-height:1.7}

/* ===== 未来规划 ===== */
.roadmap-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.road-card{background:var(--tint);border:1px solid var(--line);border-radius:var(--radius);padding:32px 28px;position:relative;overflow:hidden}
.road-year{display:inline-block;font-size:15px;font-weight:800;letter-spacing:.12em;color:var(--red)}
.road-card h3{font-size:26px;color:var(--navy);margin:10px 0 4px}
.road-sub{font-size:16px;color:#5A6C7C;margin-bottom:22px;padding-bottom:18px;border-bottom:1px solid #D8E2EA}
.road-card ul{display:flex;flex-direction:column;gap:12px}
.road-card li{font-size:15px;color:#43576A;line-height:1.7;padding-left:18px;position:relative}
.road-card li::before{content:"";position:absolute;left:0;top:11px;width:7px;height:7px;border-radius:2px;background:var(--red-light);transform:rotate(45deg)}
.road-card-dark{background:var(--navy);border-color:var(--navy);color:#fff}
.road-card-dark .road-year{color:var(--red-light)}
.road-card-dark h3{color:#fff}
.road-card-dark .road-sub{color:#C6D6E2;border-color:rgba(255,255,255,.24)}
.road-card-dark li{color:#DCE8F0}

/* ===== 建站案例 ===== */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.case-card{margin:0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s}
.case-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}
.case-shot{aspect-ratio:16/10;background:#EEF2F6;overflow:hidden;border-bottom:1px solid var(--line)}
.case-shot img{width:100%;height:100%;object-fit:cover;object-position:top center;transition:transform .5s}
.case-card:hover .case-shot img{transform:scale(1.045)}
.case-card figcaption{display:grid;grid-template-columns:30px 1fr;column-gap:12px;padding:18px 20px 20px}
.case-card figcaption>span{grid-row:span 2;font-size:13px;font-weight:800;color:var(--red);padding-top:3px}
.case-card figcaption strong{font-size:17px;color:var(--navy);line-height:1.4}
.case-card figcaption em{font-style:normal;font-size:13.5px;color:var(--muted);margin-top:4px;line-height:1.6}
.portal-cta{margin-top:40px;display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;background:var(--navy-dark);color:#fff;border-radius:var(--radius);padding:30px 34px}
.portal-cta h3{font-size:23px;margin:6px 0 8px;line-height:1.4}
.portal-cta p:not(.eyebrow){font-size:14.5px;color:#B9CBD8;line-height:1.8;max-width:640px}
.portal-cta .btn{flex:none}
.portal-cta-light{background:var(--tint);border:1px solid var(--line);color:var(--ink)}
.portal-cta-light h3{color:var(--navy)}
.portal-cta-light p:not(.eyebrow){color:var(--muted)}

/* ===== 智能硬件 ===== */
.hw-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.hw-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s}
.hw-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}
.hw-photo{background:#fff;border-bottom:1px solid #EDF1F5;aspect-ratio:4/3;display:grid;place-items:center;overflow:hidden}
.hw-photo img{width:100%;height:100%;object-fit:contain}
.hw-body{padding:20px 20px 22px}
.hw-body h3{font-size:17px;color:var(--navy);line-height:1.45;margin-bottom:8px}
.hw-body p{font-size:13.5px;color:var(--muted);line-height:1.8}
.hw-specs{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.hw-specs span{font-size:13.5px;color:var(--navy);background:#EAF1F6;border:1px solid #D8E4EC;border-radius:4px;padding:8px 14px}

/* ===== 联系 ===== */
.contact{position:relative;color:#fff;padding:104px 0;overflow:hidden;isolation:isolate}
.contact-bg{position:absolute;inset:0;z-index:-2;background:url("../img/hero-bg.jpg") center/cover no-repeat}
.contact::before{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(90deg,rgba(6,22,39,.96),rgba(9,32,53,.88))}
.contact-inner{display:grid;grid-template-columns:1fr .9fr;gap:64px;align-items:center}
.contact-copy h2{font-size:clamp(32px,4.2vw,52px);line-height:1.3;margin:10px 0 22px}
.contact-copy>p:not(.eyebrow){font-size:16.5px;color:#C6D6E2;line-height:1.95;max-width:520px}
.contact-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}
.contact-meta span{font-size:13.5px;color:#DCE8F0;border:1px solid rgba(255,255,255,.24);border-radius:4px;padding:7px 14px}
.contact-card{background:rgba(255,255,255,.075);border:1px solid rgba(255,255,255,.18);border-radius:var(--radius);padding:36px;backdrop-filter:blur(8px)}
.contact-label{font-size:12.5px;letter-spacing:.18em;color:var(--red-light);font-weight:700;text-transform:uppercase}
.contact-url{display:block;font-size:clamp(20px,2.4vw,28px);font-weight:700;color:#fff;margin:10px 0 14px;word-break:break-all;border-bottom:1px solid rgba(255,255,255,.3);padding-bottom:14px}
.contact-url:hover{color:var(--red-light)}
.contact-hint{font-size:14.5px;color:#B9CBD8;line-height:1.8}
.contact-actions{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0 28px}
.contact-affiliates{padding-top:22px;border-top:1px solid rgba(255,255,255,.16)}
.contact-affiliates p:not(.contact-label){font-size:13.5px;color:#C6D6E2;line-height:1.9;margin-top:8px}
.contact-affiliates small{display:block;font-size:12px;color:#8FA8BC;margin-top:8px}
.contact-lines{display:flex;flex-direction:column;gap:10px;margin-top:30px;max-width:520px}
.contact-line{display:flex;flex-direction:column;gap:2px;padding:12px 16px;border:1px solid rgba(255,255,255,.2);border-radius:6px;background:rgba(255,255,255,.05);transition:background .25s,border-color .25s}
a.contact-line:hover{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.42)}
.contact-line>span{font-size:12.5px;letter-spacing:.1em;color:#9FB6C8}
.contact-line>strong{font-size:clamp(19px,2.2vw,25px);font-weight:700;color:#fff;letter-spacing:.02em;line-height:1.45}
.contact-line>strong.contact-addr{font-size:16px;font-weight:600;line-height:1.7;letter-spacing:0}
.qr-row{display:flex;align-items:center;gap:18px;padding:20px 0;border-top:1px solid rgba(255,255,255,.16)}
.qr-row img{width:116px;height:116px;flex:none;background:#fff;border-radius:8px;padding:6px;object-fit:contain}
.qr-row strong{display:block;font-size:17px;color:#fff;margin:6px 0 4px}
.qr-row p:not(.contact-label){font-size:13.5px;color:#B9CBD8;line-height:1.8}

/* ===== 页脚 ===== */
.site-footer{background:var(--navy-deep);color:#A9BECD;padding:56px 0 0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr .8fr;gap:40px;padding-bottom:40px}
.footer-brand{display:flex;gap:16px;align-items:center}
.footer-logo{width:60px;height:60px;border-radius:10px;background:#fff;display:grid;place-items:center;flex:none}
.footer-logo img{width:52px;height:52px;object-fit:contain}
.footer-brand strong{display:block;font-size:18px;color:#fff;margin-bottom:4px}
.footer-brand p{font-size:13.5px;color:#8FA8BC}
.footer-links{display:grid;grid-template-columns:repeat(2,1fr);gap:10px 20px;align-content:start}
.footer-links a{font-size:14px;color:#A9BECD;transition:color .2s}
.footer-links a:hover{color:#fff}
.footer-contact a{font-size:16px;color:#fff;font-weight:600}
.footer-contact p{font-size:14px;margin-top:8px;line-height:1.8}
.footer-contact p a{font-size:13.5px;color:#A9BECD;font-weight:400}
.footer-contact p a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:20px 0 24px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:#7E96AA}
.nowrap{white-space:nowrap}
.back-top{position:fixed;right:24px;bottom:24px;width:44px;height:44px;border:0;border-radius:50%;background:var(--navy);color:#fff;font-size:20px;box-shadow:0 8px 24px rgba(11,34,55,.28);opacity:0;pointer-events:none;transform:translateY(12px);transition:opacity .3s,transform .3s;z-index:90}
.back-top.show{opacity:1;pointer-events:auto;transform:none}
.back-top:hover{background:var(--red)}

/* ===== 动效 ===== */
.js .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.3,1)}
.js .reveal.in-view{opacity:1;transform:none}
.cards-grid .card:nth-child(2),.scene-grid .scene-card:nth-child(2),.roadmap-grid .road-card:nth-child(2),.team-grid .person-card:nth-child(2){transition-delay:.09s}
.cards-grid .card:nth-child(3),.scene-grid .scene-card:nth-child(3),.roadmap-grid .road-card:nth-child(3){transition-delay:.18s}
.cards-grid .card:nth-child(5){transition-delay:.09s}
.cards-grid .card:nth-child(6){transition-delay:.18s}

/* ===== 响应式 ===== */
@media (max-width:1080px){
  .nav-links{gap:12px}
  .nav-links a{font-size:13.5px}
  .hw-grid{grid-template-columns:repeat(2,1fr)}
  .about-grid{gap:40px}
  .cap-grid{gap:32px}
  .service-block{gap:30px}
  .contact-inner{gap:36px}
}
@media (max-width:960px){
  .nav-toggle{display:flex}
  .nav-links{position:absolute;top:var(--header-h);left:0;right:0;display:none;flex-direction:column;align-items:stretch;gap:0;background:#fff;padding:12px 24px 20px;box-shadow:0 18px 30px rgba(11,34,55,.14);border-bottom:1px solid var(--line);max-height:calc(100svh - var(--header-h));overflow-y:auto}
  .nav-links.open{display:flex}
  .nav-links a{padding:13px 4px;border-bottom:1px solid #EEF2F6;font-size:15.5px}
  .nav-links a::after{display:none}
  .nav-links .nav-cta{margin-top:12px;text-align:center;border:0}
  .section{padding:80px 0}
  .cards-grid,.scene-grid,.roadmap-grid,.case-grid{grid-template-columns:repeat(2,1fr)}
  .card p{min-height:0}
  .about-grid,.cap-grid,.team-grid,.team-bottom,.service-block,.contact-inner{grid-template-columns:1fr}
  .showcase-body{grid-template-columns:1fr}
  .showcase-tabs{flex-direction:row;overflow-x:auto;padding-bottom:6px;scrollbar-width:thin}
  .showcase-tab{flex:none;white-space:nowrap}
  .service-steps{grid-template-columns:repeat(3,1fr)}
  .contact,.section{padding:80px 0}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-contact{grid-column:span 2}
}
@media (max-width:640px){
  .container{width:min(100% - 32px,var(--maxw))}
  :root{--header-h:66px}
  .brand-mark,.brand-mark img{width:38px;height:38px}
  .brand-text strong{font-size:17px}
  .brand-text small{font-size:9px}
  .section{padding:64px 0}
  .section-head{margin-bottom:36px}
  .hero{min-height:auto}
  .hero-inner{padding:64px 0 44px}
  .hero h1{font-size:clamp(36px,9vw,52px)}
  .hero-sub{font-size:16px}
  .hero-badges{margin-top:32px}
  .hero-badges span{font-size:12.5px;padding:7px 12px}
  .hero-actions .btn{flex:1 1 100%}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .stat{padding:18px 6px;border-bottom:1px solid rgba(255,255,255,.12)}
  .stat:nth-child(2){border-right:0}
  .stat:nth-child(3),.stat:nth-child(4){border-bottom:0}
  .stat strong{font-size:30px}
  .cards-grid,.scene-grid,.roadmap-grid,.innovation-grid,.service-steps,.cert-images,.case-grid,.hw-grid{grid-template-columns:1fr}
  .portal-cta{padding:24px 20px;gap:18px}
  .portal-cta .btn{width:100%}
  .qr-row img{width:96px;height:96px}
  .qr-row{gap:14px}
  .contact-line>strong{font-size:21px}
  .contact-line>strong.contact-addr{font-size:14.5px}
  .hw-specs span{font-size:12.5px;padding:7px 11px}
  .card,.scene-card,.road-card{padding:26px 22px}
  .cap-row{gap:14px}
  .cap-side{padding:28px 22px}
  .showcase{margin-top:60px}
  .showcase-preview img{aspect-ratio:16/10}
  .showcase-preview figcaption{padding:16px 18px 20px}
  .team-grid{gap:18px}
  .person-card{grid-template-columns:110px 1fr;gap:18px;padding:18px}
  .person-body h3{font-size:20px}
  .person-body p{font-size:14px}
  .person-tags{gap:6px}
  .person-tags span{font-size:11.5px}
  .honor-panel,.role-panel{padding:22px}
  .cert-images img{height:180px}
  .customer-wall{padding:12px}
  .service-block{margin-top:48px}
  .service-steps li{min-height:0}
  .contact{padding:64px 0}
  .contact-card{padding:24px 20px}
  .contact-actions .btn{flex:1 1 100%}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-contact{grid-column:auto}
  .footer-bottom{flex-direction:column;gap:6px}
  .back-top{right:16px;bottom:16px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
  .js .reveal{opacity:1;transform:none}
}