/* ============================================================
   HIGHMAX TECH — Design System v4
   参考图：左文右图Hero + 浅蓝灰背景 + 清晰字体层级
   ============================================================ */
:root {
  --blue:   #165dff;
  --blue-d: #0e4fe0;
  --blue-t: #EEF3FF;
  --navy:   #0A1628;
  --t1:     #111827;
  --t2:     #374151;
  --t3:     #6B7280;
  --border: #E5E8EF;
  --bg:     #F7F9FC;
  --r:      6px;
  --r-lg:   12px;
  --max:    1200px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}
body{font-family:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;font-size:15px;line-height:1.65;color:#1a1a1a;background:#fff;font-weight:400;-webkit-font-smoothing:subpixel-antialiased}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{display:block;max-width:100%}
.container{max-width:var(--max);margin:0 auto;padding:0 48px}

/* ── BUTTONS ── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 22px;border-radius:var(--r);font-size:14px;font-weight:500;cursor:pointer;border:none;font-family:inherit;transition:all .18s;white-space:nowrap}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-d);box-shadow:0 4px 14px rgba(22,100,255,.35)}
.btn-outline{background:#fff;color:var(--t1);border:1.5px solid var(--border)}
.btn-outline:hover{border-color:var(--blue);color:var(--blue)}
.btn-ghost-white{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.5)}
.btn-ghost-white:hover{background:rgba(255,255,255,.12)}
.btn-white{background:#fff;color:var(--blue);font-weight:600}
.btn-white:hover{background:#f0f5ff}
.btn-lg{padding:11px 28px;font-size:15px}
.btn-full{width:100%;padding:12px;font-size:15px;justify-content:center}

/* ── NAV ── */
.nav{position:fixed;top:0;left:0;right:0;z-index:1000;background:#fff;border-bottom:1px solid var(--border);transition:box-shadow .25s}
.nav.scrolled{box-shadow:0 2px 16px rgba(0,0,0,.08);border-bottom-color:transparent}
.nav-inner{display:flex;align-items:center;height:76px;gap:0}
.nav-logo-img{height:60px;width:auto;object-fit:contain;flex-shrink:0;margin-right:48px}
.nav-menu{display:flex;align-items:center;flex:1}
.nav-link{position:relative;padding:0 16px;height:76px;display:flex;align-items:center;font-size:14px;font-weight:500;color:#374151;transition:color .15s;white-space:nowrap}
.nav-link::after{content:'';position:absolute;bottom:0;left:16px;right:16px;height:2px;background:var(--blue);transform:scaleX(0);transform-origin:center;transition:transform .2s ease}
.nav-link:hover{color:var(--blue)}
.nav-link:hover::after,.nav-link.active::after{transform:scaleX(1)}
.nav-link.active{color:var(--blue);font-weight:600}
.nav-right{display:flex;align-items:center;gap:8px;margin-left:auto}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.hamburger span{display:block;width:20px;height:1.5px;background:var(--t1);border-radius:2px;transition:all .3s}

/* ── HERO ── */
.hero{background:linear-gradient(160deg,#EEF3FF 0%,#F5F8FF 40%,#EAF0FF 100%);background-image:url('hero-bg.jpg');background-size:cover;background-position:center;padding:100px 0 80px;min-height:560px;display:flex;align-items:center}
.hero-content{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.hero-tag{display:inline-flex;align-items:center;gap:6px;background:rgba(22,100,255,.08);border:1px solid rgba(22,100,255,.2);color:var(--blue);font-size:13px;font-weight:500;letter-spacing:.03em;padding:5px 14px;border-radius:100px;margin-bottom:20px}
.hero-h1{font-size:48px;font-weight:800;color:#111827;line-height:1.12;letter-spacing:-.03em;margin-bottom:18px}
.hero-p{font-size:15px;color:#374151;line-height:1.8;margin-bottom:32px;max-width:460px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:48px}
.hero-metrics{display:flex;gap:0;padding-top:32px;border-top:1px solid rgba(22,100,255,.12)}
.hm-item{padding:0 28px;border-right:1px solid var(--border)}
.hm-item:first-child{padding-left:0}
.hm-item:last-child{border-right:none}
.hm-num{font-size:28px;font-weight:800;color:var(--blue);line-height:1;margin-bottom:4px;letter-spacing:-.02em}
.hm-num sup{font-size:13px;font-weight:600}
.hm-label{font-size:13px;color:#6B7280}
.hero-visual{display:flex;align-items:center;justify-content:center}
.hero-body{display:flex;flex-direction:column}
.hero-h1 em{font-style:normal;color:var(--blue)}
.hero-visual img{width:100%;border-radius:12px;object-fit:cover}
.hero-visual-placeholder{width:100%;aspect-ratio:4/3;background:linear-gradient(135deg,#dbeafe,#bfdbfe);border-radius:16px;display:flex;align-items:center;justify-content:center}
.hero-visual-placeholder svg{width:120px;height:120px;opacity:.4}

/* ── SECTION COMMON ── */
.section{padding:72px 0}
.sec-hd{margin-bottom:40px}
.sec-hd.center{text-align:center}
.sec-hd.center .sec-sub{margin:10px auto 0}
.eyebrow{font-size:14px;font-weight:600;letter-spacing:.05em;color:var(--blue);margin-bottom:10px;display:block}
.h2{font-size:36px;font-weight:700;color:#111827;line-height:1.2;letter-spacing:-.025em;margin-bottom:12px}
.h2.light{color:#fff}
.lead{font-size:16px;color:#374151;line-height:1.75;max-width:680px}
.sec-hd.center .lead{margin:0 auto}

/* ── PRODUCTS ── */
.products{background:var(--bg)}
.tab-nav{display:flex;border-bottom:1px solid var(--border);margin-bottom:40px}
.tab-btn{display:flex;align-items:center;gap:7px;padding:11px 18px;font-size:14px;font-weight:400;color:#374151;background:none;border:none;border-bottom:2px solid transparent;margin-bottom:-1px;cursor:pointer;font-family:inherit;transition:color .15s;white-space:nowrap}
.tab-btn svg{width:15px;height:15px;flex-shrink:0;opacity:.6}
.tab-btn:hover{color:var(--t1)}
.tab-btn.active{color:var(--blue);font-weight:500;border-bottom-color:var(--blue)}
.tab-btn.active svg{opacity:1}
.tab-panel{display:none}
.tab-panel.active{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.tab-text .h3{font-size:26px;font-weight:700;color:#111827;margin-bottom:14px;letter-spacing:-.01em}
.tab-text .body{font-size:15px;color:#374151;line-height:1.85;margin-bottom:24px}
.feat-list{margin-bottom:32px;display:flex;flex-direction:column;gap:10px}
.feat-list li{display:flex;align-items:flex-start;gap:10px;font-size:14px;color:#374151;line-height:1.65}
.feat-list li::before{content:'';width:5px;height:5px;background:var(--blue);border-radius:50%;flex-shrink:0;margin-top:8px}
.tab-visual{background:#fff;border:1px solid var(--border);border-radius:var(--r-lg);padding:28px;display:grid;grid-template-columns:1fr 1fr;gap:10px}
.tv-card{border:1px solid var(--border);border-radius:var(--r);padding:16px;display:flex;flex-direction:column;gap:8px;transition:border-color .2s,box-shadow .2s}
.tv-card:hover{border-color:var(--blue);box-shadow:0 0 0 3px rgba(22,100,255,.07)}
.tv-dot{width:32px;height:32px;border-radius:8px;background:var(--blue-t);display:flex;align-items:center;justify-content:center}
.tv-dot.indigo{background:#EEF2FF}
.tv-dot.teal{background:#F0FDFA}
.tv-dot svg{width:16px;height:16px}
.tv-name{font-size:14px;font-weight:600;color:var(--t1)}
.tv-desc{font-size:13px;color:#6B7280;line-height:1.5}

/* ── SOLUTIONS ── */
.solutions{background:#fff}
.sol-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.sol-card{border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;transition:transform .22s,box-shadow .22s,border-color .22s}
.sol-card:hover{transform:translateY(-4px);box-shadow:0 16px 48px rgba(0,0,0,.1);border-color:transparent}
.sol-thumb{height:160px;display:flex;align-items:center;justify-content:center;overflow:hidden;background:#e8edf5}
.sol-thumb img{width:100%;height:100%;object-fit:cover}
.sol-body{padding:20px}
.sol-body h4{font-size:15px;font-weight:600;color:var(--t1);margin-bottom:8px}
.sol-body p{font-size:14px;color:#374151;line-height:1.75;margin-bottom:12px}
.sol-link{font-size:14px;font-weight:500;color:var(--blue);display:inline-flex;align-items:center;gap:3px;transition:gap .15s}
.sol-card:hover .sol-link{gap:6px}

/* ── ADVANTAGES ── */
.advantages{background:var(--bg)}
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden}
.adv-card{padding:28px 24px;border-right:1px solid var(--border);transition:background .2s}
.adv-card:last-child{border-right:none}
.adv-card:hover{background:var(--bg)}
.adv-no{font-size:12px;font-weight:600;color:#6B7280;letter-spacing:.1em;margin-bottom:20px}
.adv-icon{width:40px;height:40px;background:var(--blue-t);border-radius:10px;display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.adv-icon svg{width:22px;height:22px}
.adv-card h4{font-size:15px;font-weight:600;color:var(--t1);margin-bottom:8px}
.adv-card p{font-size:14px;color:#374151;line-height:1.8}

/* ── CTA BAND ── */
.cta-band{background:linear-gradient(135deg,#0A1F44 0%,#165dff 100%);padding:64px 0}
.cta-band-inner{display:flex;align-items:center;justify-content:space-between;gap:40px}
.cta-band-inner h2{font-size:26px;font-weight:700;color:#fff;margin-bottom:8px;letter-spacing:-.01em}
.cta-band-inner p{font-size:14px;color:rgba(255,255,255,.7)}

/* ── CONTACT ── */
.contact{background:var(--bg)}
.contact-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:56px;align-items:stretch}
.contact-info h2{font-size:28px;font-weight:700;color:var(--t1);margin-bottom:10px;letter-spacing:-.01em}
.contact-sub{font-size:14px;color:#374151;line-height:1.75}
.ci-list{display:flex;flex-direction:column;gap:20px}
.ci-row{display:flex;align-items:flex-start;gap:12px}
.ci-icon{width:38px;height:38px;background:#fff;border:1px solid var(--border);border-radius:var(--r);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.ci-icon svg{width:17px;height:17px}
.ci-label{font-size:13px;color:#6B7280;margin-bottom:2px}
.ci-val{font-size:15px;font-weight:500;color:var(--t1);line-height:1.6}
.contact-form{background:#fff;border:1px solid var(--border);border-radius:var(--r-lg);padding:36px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.fg{display:flex;flex-direction:column;gap:5px;margin-bottom:14px}
.fg label{font-size:13px;font-weight:500;color:var(--t1)}
.req{color:#F53F3F}
.fg input,.fg textarea,.fg select{padding:8px 12px;border:1px solid var(--border);border-radius:var(--r);font-size:14px;color:var(--t1);background:#fff;outline:none;transition:border-color .15s,box-shadow .15s;font-family:inherit;resize:vertical;appearance:none}
.fg input:focus,.fg textarea:focus,.fg select:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(22,100,255,.1)}
.fg input::placeholder,.fg textarea::placeholder{color:#C9CDD4}

/* ── FOOTER ── */
.footer{background:#0d1526}
.footer-main{display:grid;grid-template-columns:240px 1fr;gap:80px;padding:56px 0 44px}
.footer-logo-img{height:120px;width:auto;object-fit:contain;margin-bottom:14px}
.footer-tagline{font-size:14px;color:rgba(255,255,255,.65);line-height:1.7;max-width:200px}
.footer-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:56px}
.fc h5{font-size:13px;font-weight:600;color:rgba(255,255,255,.7);letter-spacing:.06em;text-transform:uppercase;margin-bottom:16px}
.fc a,.fc span{display:block;font-size:14px;color:rgba(255,255,255,.65);margin-bottom:10px;transition:color .15s;line-height:1.6}
.fc a:hover{color:#fff}
.footer-bar{border-top:1px solid rgba(255,255,255,.1);padding:18px 0}
.footer-bar-inner{display:flex;justify-content:space-between;font-size:13px;color:rgba(255,255,255,.55)}

/* ── REVEAL ── */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}
.reveal.in{opacity:1;transform:none}
.d1{transition-delay:.08s}.d2{transition-delay:.16s}.d3{transition-delay:.24s}

/* ── RESPONSIVE ── */
@media(max-width:1024px){
  .hero-h1{font-size:36px}
  .hero-content{gap:40px}
  .adv-grid{grid-template-columns:repeat(2,1fr)}
  .adv-card:nth-child(2){border-right:none}
  .adv-card:nth-child(1),.adv-card:nth-child(2){border-bottom:1px solid var(--border)}
  .sol-grid{grid-template-columns:repeat(2,1fr)}
  .tab-panel.active{grid-template-columns:1fr;gap:32px}
  .cta-band-inner{flex-direction:column;text-align:center}
}
@media(max-width:768px){
  .container{padding:0 20px}
  .section{padding:64px 0}
  .hero{padding:88px 0 60px}
  .hero-content{grid-template-columns:1fr}
  .hero-visual{display:none}
  .hero-h1{font-size:32px}
  .hero-p{font-size:14px}
  .hero-metrics{flex-wrap:wrap;gap:16px;border-top:none;padding-top:0}
  .hm-item{border-right:none;padding:0 12px 0 0}
  .h2{font-size:26px}
  .nav-menu{display:none}
  .hamburger{display:flex}
  .nav-right .btn-primary{display:none}
  .contact-grid{grid-template-columns:1fr;gap:36px}
  .form-row{grid-template-columns:1fr}
  .footer-main{grid-template-columns:1fr;gap:32px}
  .footer-cols{grid-template-columns:repeat(2,1fr)}
  .footer-bar-inner{flex-direction:column;gap:4px}
}
@media(max-width:480px){
  .hero-h1{font-size:28px}
  .hero-actions{flex-direction:column}
  .sol-grid{grid-template-columns:1fr}
  .adv-grid{grid-template-columns:1fr}
  .adv-card{border-right:none;border-bottom:1px solid var(--border)}
  .footer-cols{grid-template-columns:1fr}
  .contact-form{padding:20px 16px}
}
.nav-menu.open{display:flex!important;flex-direction:column;position:fixed;top:60px;left:0;right:0;background:#fff;padding:8px 16px 16px;z-index:999;border-top:1px solid var(--border);box-shadow:0 4px 16px rgba(0,0,0,.08)}
.nav-menu.open .nav-link{height:auto;padding:10px 12px;border-radius:var(--r)}
.nav-menu.open .nav-link::after{display:none}
.nav-menu.open .nav-link:hover{background:var(--bg)}