/* ==========================================================================
   合智盒子官网 · style.css
   现代 · 响应式 · 企业官网
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root{
  --navy-900:#06102e;
  --navy-800:#0a1a3a;
  --navy-700:#102a5e;
  --navy-600:#163577;
  --blue-500:#1d6fe0;
  --blue-400:#3b8bfd;
  --cyan-400:#22d3ee;
  --cyan-300:#67e8f9;
  --teal-500:#14b8a6;
  --ink:#1a2342;
  --ink-soft:#475069;
  --muted:#6b7493;
  --line:#e6eaf3;
  --bg:#f5f8fe;
  --bg-alt:#eef3fb;
  --white:#ffffff;
  --radius:14px;
  --radius-lg:22px;
  --shadow-sm:0 2px 10px rgba(16,42,94,.06);
  --shadow:0 10px 34px rgba(16,42,94,.10);
  --shadow-lg:0 22px 60px rgba(10,26,58,.18);
  --maxw:1200px;
  --header-h:70px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --grad:linear-gradient(120deg,var(--blue-500),var(--cyan-400));
  --grad-deep:linear-gradient(135deg,#0a1a3a,#163577 55%,#0e7490);
}

/* ---------- 基础重置 ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Helvetica Neue",Arial,sans-serif;
  color:var(--ink);
  background:var(--white);
  line-height:1.7;
  font-size:16px;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit}
ul{list-style:none}
svg{width:100%;height:100%}
section{position:relative}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 30px;border-radius:40px;font-weight:600;font-size:15px;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .25s,color .25s;
  white-space:nowrap;
}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 22px rgba(29,111,224,.32)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(29,111,224,.42)}
.btn-ghost{background:rgba(255,255,255,.08);color:#fff;border:1.5px solid rgba(255,255,255,.45);backdrop-filter:blur(4px)}
.btn-ghost:hover{background:rgba(255,255,255,.18);transform:translateY(-3px)}

/* ---------- 顶部公告条 ---------- */
.topbar{background:var(--navy-900);color:#aebbd6;font-size:13px;padding:7px 0}
.topbar-inner{display:flex;gap:28px;flex-wrap:wrap}
.topbar-item{display:inline-flex;align-items:center;gap:7px}
.topbar .ic{width:14px;height:14px;fill:var(--cyan-400)}

/* ---------- 导航栏 ---------- */
.navbar{
  position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);transition:box-shadow .3s,background .3s;
}
.navbar.scrolled{box-shadow:var(--shadow-sm)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:var(--header-h)}
.brand{display:flex;align-items:center;gap:11px}
.brand-logo{border-radius:9px;box-shadow:var(--shadow-sm)}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-text strong{font-size:19px;color:var(--navy-800);letter-spacing:.5px}
.brand-text small{font-size:10px;color:var(--muted);letter-spacing:2px;font-weight:600}
.nav-menu{display:flex;align-items:center;gap:6px}
.nav-link{
  position:relative;padding:8px 15px;font-size:15px;font-weight:500;color:var(--ink-soft);
  border-radius:8px;transition:color .25s,background .25s;
}
.nav-link::after{
  content:"";position:absolute;left:15px;right:15px;bottom:3px;height:2px;border-radius:2px;
  background:var(--grad);transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease);
}
.nav-link:hover{color:var(--blue-500)}
.nav-link:hover::after,.nav-link.active::after{transform:scaleX(1)}
.nav-link.active{color:var(--navy-800);font-weight:600}
.nav-cta{margin-left:10px;color:#fff}
.nav-cta::after{display:none}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px}
.nav-toggle span{width:24px;height:2.4px;background:var(--navy-800);border-radius:2px;transition:transform .3s,opacity .3s}
.nav-toggle.active span:nth-child(1){transform:translateY(7.4px) rotate(45deg)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:translateY(-7.4px) rotate(-45deg)}

/* ---------- 首页轮播 ---------- */
.hero{position:relative;height:640px;overflow:hidden;background:var(--navy-900)}
.hero-slides{position:absolute;inset:0}
.hero-slide{
  position:absolute;inset:0;display:flex;align-items:center;
  background-size:cover;background-position:center;
  opacity:0;visibility:hidden;transition:opacity 1s var(--ease),visibility 1s;
}
.hero-slide.active{opacity:1;visibility:visible}
.hero-content{max-width:680px;color:#fff;transform:translateY(30px);opacity:0;transition:transform .9s var(--ease) .15s,opacity .9s var(--ease) .15s}
.hero-slide.active .hero-content{transform:translateY(0);opacity:1}
.hero-eyebrow{font-size:13px;letter-spacing:3px;text-transform:uppercase;color:var(--cyan-300);font-weight:600;margin-bottom:18px}
.hero-title{font-size:48px;font-weight:800;line-height:1.22;letter-spacing:1px;margin-bottom:22px;text-shadow:0 4px 24px rgba(0,0,0,.3)}
.hero-desc{font-size:17px;color:#d4ddf2;max-width:560px;margin-bottom:34px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.hero-dots{position:absolute;bottom:28px;left:50%;transform:translateX(-50%);display:flex;gap:10px;z-index:5}
.hero-dot{width:11px;height:11px;border-radius:50%;background:rgba(255,255,255,.4);transition:all .3s var(--ease)}
.hero-dot.active{width:30px;border-radius:6px;background:var(--cyan-400)}
.hero-arrow{position:absolute;top:50%;transform:translateY(-50%);z-index:5;width:48px;height:48px;border-radius:50%;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);color:#fff;display:flex;align-items:center;justify-content:center;transition:background .25s,transform .25s}
.hero-arrow:hover{background:rgba(255,255,255,.28)}
.hero-arrow svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.hero-arrow.prev{left:24px}.hero-arrow.next{right:24px}

/* ---------- 数据统计 ---------- */
.stats{background:var(--grad-deep);padding:42px 0;position:relative;z-index:2;margin-top:-1px}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat-num{font-size:42px;font-weight:800;color:#fff;line-height:1.1}
.stat-num span{display:inline}
.stat-label{font-size:15px;color:#aebbd6;margin-top:6px;letter-spacing:1px}

/* ---------- 通用 section ---------- */
.section{padding:92px 0}
.section-head{text-align:center;max-width:680px;margin:0 auto 56px}
.section-tag{display:inline-block;font-size:12px;letter-spacing:3px;text-transform:uppercase;font-weight:700;color:var(--blue-500);background:rgba(29,111,224,.1);padding:5px 16px;border-radius:20px;margin-bottom:16px}
.section-title{font-size:36px;font-weight:800;color:var(--navy-800);letter-spacing:1px}
.section-sub{font-size:16px;color:var(--muted);margin-top:10px}
.section-head.light .section-title{color:#fff}
.section-head.light .section-sub{color:#b8c4e0}
.section-head.light .section-tag{color:var(--cyan-300);background:rgba(34,211,238,.12)}

/* ---------- 公司简介 ---------- */
.about{background:var(--bg)}
.about-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.about-lead{font-size:20px;color:var(--navy-800);font-weight:600;line-height:1.7;margin-bottom:18px}
.about-text p{color:var(--ink-soft);margin-bottom:16px}
.about-text strong{color:var(--blue-500)}
.about-list{margin-top:22px;display:flex;flex-direction:column;gap:14px}
.about-list li{display:flex;align-items:center;gap:12px;font-size:15.5px;color:var(--ink-soft)}
.ic-check{width:22px;height:22px;flex:0 0 auto;border-radius:50%;background:var(--grad);position:relative}
.ic-check::after{content:"";position:absolute;left:7px;top:4px;width:5px;height:10px;border:solid #fff;border-width:0 2px 2px 0;transform:rotate(45deg)}
.about-vision{background:#fff;border-radius:var(--radius-lg);padding:40px 34px;box-shadow:var(--shadow);border:1px solid var(--line)}
.vision-title{font-size:20px;color:var(--navy-800);margin-bottom:24px;text-align:center;font-weight:700;position:relative}
.vision-title::after{content:"";display:block;width:40px;height:3px;border-radius:3px;background:var(--grad);margin:10px auto 0}
.vision-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.vision-card{padding:26px 16px;border-radius:var(--radius);background:linear-gradient(160deg,var(--bg-alt),#fff);text-align:center;border:1px solid var(--line);transition:transform .3s var(--ease),box-shadow .3s}
.vision-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.vision-cn{font-size:26px;font-weight:800;color:var(--navy-800);letter-spacing:2px}
.vision-en{font-size:12px;color:var(--blue-500);letter-spacing:2px;margin-top:5px;text-transform:uppercase;font-weight:600}

/* ---------- 服务内容 ---------- */
.services{background:#fff}
.service-line{background:var(--bg);border-radius:var(--radius-lg);padding:40px 38px;margin-bottom:34px;border:1px solid var(--line)}
.service-line-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:30px}
.service-no{display:inline-block;font-size:13px;font-weight:800;color:var(--cyan-400);letter-spacing:2px;margin-bottom:6px}
.service-line h3{font-size:24px;color:var(--navy-800);font-weight:700}
.service-line-sub{font-size:13px;color:var(--muted);margin-top:4px;letter-spacing:.5px}
.flow-chain{display:flex;align-items:stretch;justify-content:space-between;gap:8px;margin-bottom:24px;flex-wrap:wrap}
.flow-step{flex:1;min-width:120px;background:#fff;border-radius:var(--radius);padding:20px 14px;text-align:center;border:1px solid var(--line);position:relative;box-shadow:var(--shadow-sm)}
.flow-stage{font-size:20px;font-weight:700;color:var(--navy-800)}
.flow-detail{font-size:13px;color:var(--muted);margin-top:6px;letter-spacing:1px}
.flow-arrow{width:34px;flex:0 0 34px;display:flex;align-items:center;justify-content:center;position:relative}
.flow-arrow::after{content:"";width:10px;height:10px;border-top:2.5px solid var(--blue-400);border-right:2.5px solid var(--blue-400);transform:rotate(45deg)}
.service-line-desc{color:var(--ink-soft);font-size:15px;margin-bottom:22px}
.pillars{display:flex;gap:14px;flex-wrap:wrap}
.pillar{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:30px;padding:8px 18px 8px 8px}
.pillar-key{width:34px;height:34px;border-radius:50%;background:var(--grad-deep);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:17px}
.pillar-val{font-size:14px;color:var(--ink-soft);font-weight:600}

.services-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:10px}
.service-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 24px;transition:transform .3s var(--ease),box-shadow .3s,border-color .3s;position:relative;overflow:hidden}
.service-card::before{content:"";position:absolute;left:0;top:0;width:100%;height:3px;background:var(--grad);transform:scaleX(0);transform-origin:left;transition:transform .35s var(--ease)}
.service-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:transparent}
.service-card:hover::before{transform:scaleX(1)}
.service-ic{width:52px;height:52px;border-radius:13px;background:linear-gradient(150deg,var(--bg-alt),#fff);display:flex;align-items:center;justify-content:center;color:var(--blue-500);margin-bottom:18px;border:1px solid var(--line)}
.service-ic svg{width:26px;height:26px}
.service-card h4{font-size:16.5px;color:var(--navy-800);margin-bottom:8px;font-weight:700}
.service-card p{font-size:13.5px;color:var(--muted);line-height:1.6}

/* ---------- 平台产品 ---------- */
.platforms{background:var(--bg)}
.platform-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.platform-card{background:#fff;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line);display:flex;flex-direction:column}
.platform-card.toB{border-top:4px solid var(--blue-500)}
.platform-card.toC{border-top:4px solid var(--teal-500)}
.platform-info{padding:36px 34px 10px}
.platform-tag{display:inline-block;font-size:12px;font-weight:700;letter-spacing:1px;padding:4px 14px;border-radius:20px;margin-bottom:16px}
.toB .platform-tag{background:rgba(29,111,224,.1);color:var(--blue-500)}
.toC .platform-tag{background:rgba(20,184,166,.12);color:var(--teal-500)}
.platform-info h3{font-size:24px;color:var(--navy-800);font-weight:700;margin-bottom:14px}
.platform-info h3 small{font-size:14px;color:var(--muted);font-weight:500;margin-left:6px}
.platform-info p{color:var(--ink-soft);font-size:15px}
.platform-shots{display:flex;gap:18px;padding:24px 34px 36px;justify-content:center;align-items:flex-end}
.platform-shots img{width:46%;max-width:200px;border-radius:16px;box-shadow:var(--shadow-lg);border:6px solid #fff}

/* ---------- 客户案例 ---------- */
.cases{background:#fff}
.case-filters{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-bottom:40px}
.filter-btn{padding:9px 24px;border-radius:30px;font-size:14.5px;font-weight:600;color:var(--ink-soft);background:var(--bg);border:1px solid var(--line);transition:all .25s var(--ease)}
.filter-btn:hover{color:var(--blue-500);border-color:var(--blue-400)}
.filter-btn.active{background:var(--grad);color:#fff;border-color:transparent;box-shadow:0 6px 18px rgba(29,111,224,.28)}
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.case-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;cursor:pointer;transition:transform .3s var(--ease),box-shadow .3s,border-color .3s}
.case-card:hover{transform:translateY(-7px);box-shadow:var(--shadow-lg);border-color:transparent}
.case-cover{position:relative;aspect-ratio:16/10;overflow:hidden;background:var(--bg-alt)}
.case-cover img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}
.case-card:hover .case-cover img{transform:scale(1.06)}
.case-cover.is-phone{background:var(--navy-800)}
.case-cover.is-phone img{width:auto;height:100%;object-fit:contain;margin:0 auto;padding:10px}
.case-cat{position:absolute;top:14px;left:14px;font-size:12px;font-weight:600;color:#fff;background:rgba(10,26,58,.7);backdrop-filter:blur(4px);padding:4px 13px;border-radius:20px}
.case-zoom{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(10,26,58,.45);opacity:0;transition:opacity .3s}
.case-zoom svg{width:38px;height:38px;color:#fff}
.case-card:hover .case-zoom{opacity:1}
.case-info{display:flex;align-items:center;gap:14px;padding:18px 22px}
.case-logo{width:52px;height:52px;flex:0 0 auto;border-radius:11px;background:var(--bg);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;overflow:hidden;padding:6px}
.case-logo img{max-width:100%;max-height:100%;object-fit:contain}
.case-meta h4{font-size:16.5px;color:var(--navy-800);font-weight:700;margin-bottom:3px}
.case-meta p{font-size:13px;color:var(--muted)}
.case-meta p span{color:var(--blue-500);font-weight:600}
.case-note{text-align:center;color:var(--muted);font-size:13px;margin-top:34px}

/* ---------- 合作客户 ---------- */
.clients{background:var(--bg)}
.client-wall{display:grid;grid-template-columns:repeat(8,1fr);gap:16px}
.client-logo{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px;display:flex;align-items:center;justify-content:center;aspect-ratio:1.6/1;transition:transform .3s var(--ease),box-shadow .3s}
.client-logo:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.client-logo img{max-width:100%;max-height:54px;object-fit:contain;filter:grayscale(.4);opacity:.82;transition:filter .3s,opacity .3s}
.client-logo:hover img{filter:grayscale(0);opacity:1}

/* ---------- 联系我们 ---------- */
.contact{background:var(--grad-deep);color:#fff}
.contact-grid{display:grid;grid-template-columns:1.4fr .6fr;gap:44px;align-items:start}
.contact-cards{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.contact-card{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius);padding:26px 24px;display:flex;gap:16px;backdrop-filter:blur(6px);transition:background .3s,transform .3s}
.contact-card:hover{background:rgba(255,255,255,.12);transform:translateY(-4px)}
.contact-ic{width:46px;height:46px;flex:0 0 46px;border-radius:12px;background:rgba(34,211,238,.16);color:var(--cyan-300);display:flex;align-items:center;justify-content:center}
.contact-ic svg{width:23px;height:23px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.contact-card h4{font-size:16px;color:#fff;margin-bottom:4px;font-weight:700}
.contact-card p{font-size:13.5px;color:#9fb0d4}
.contact-card span{display:block;font-size:14px;color:#cdd9f2;margin-top:3px}
.contact-link{display:inline-block;color:var(--cyan-300);font-weight:600;margin-top:3px;font-size:15px}
.contact-qr{display:flex;flex-direction:column;gap:22px}
.qr-box{background:rgba(255,255,255,.95);border-radius:var(--radius);padding:18px;text-align:center;box-shadow:var(--shadow)}
.qr-box img{margin:0 auto 12px;border-radius:10px;width:140px;height:140px}
.qr-box p{font-size:15px;font-weight:700;color:var(--navy-800)}
.qr-box small{font-size:13px;color:var(--muted)}

/* ---------- 页脚 ---------- */
.footer{background:var(--navy-900);color:#9fb0d4;padding:46px 0 30px}
.footer-inner{display:grid;grid-template-columns:1.4fr 1fr 1.2fr;gap:30px;align-items:start}
.footer-brand{display:flex;align-items:center;gap:12px}
.footer-brand img{border-radius:8px}
.footer-brand strong{display:block;color:#fff;font-size:16px}
.footer-brand span{font-size:12px;color:#6b7493;letter-spacing:.5px}
.footer-nav{display:flex;flex-direction:column;gap:10px}
.footer-nav a{font-size:14px;color:#9fb0d4;transition:color .25s;width:fit-content}
.footer-nav a:hover{color:var(--cyan-300)}
.footer-copy{font-size:13px;text-align:right}
.footer-copy p{margin-bottom:6px}
.footer-addr{color:#6b7493!important;font-size:12px}
.footer::after{content:"";display:block;max-width:var(--maxw);height:1px;background:rgba(255,255,255,.08);margin:30px auto 0}

/* ---------- 返回顶部 ---------- */
.back-top{position:fixed;right:26px;bottom:26px;width:48px;height:48px;border-radius:50%;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translateY(16px);transition:all .3s var(--ease);z-index:90}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{transform:translateY(-4px)}
.back-top svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}

/* ---------- 案例弹窗 ---------- */
.modal{position:fixed;inset:0;z-index:200;display:flex;align-items:center;justify-content:center;padding:24px;opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s}
.modal.open{opacity:1;visibility:visible}
.modal-overlay{position:absolute;inset:0;background:rgba(6,16,46,.72);backdrop-filter:blur(4px)}
.modal-box{position:relative;width:100%;max-width:920px;max-height:88vh;overflow-y:auto;background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);transform:translateY(24px) scale(.98);transition:transform .35s var(--ease);padding:36px}
.modal.open .modal-box{transform:translateY(0) scale(1)}
.modal-box::-webkit-scrollbar{width:8px}
.modal-box::-webkit-scrollbar-thumb{background:var(--line);border-radius:4px}
.modal-close{position:absolute;top:16px;right:18px;width:38px;height:38px;border-radius:50%;background:var(--bg);font-size:24px;color:var(--ink-soft);display:flex;align-items:center;justify-content:center;transition:background .25s,color .25s;z-index:2}
.modal-close:hover{background:var(--navy-800);color:#fff}
.modal-head{display:flex;align-items:center;gap:18px;margin-bottom:28px;padding-right:50px}
.modal-logo{width:66px;height:66px;flex:0 0 66px;border-radius:14px;background:var(--bg);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;padding:8px;overflow:hidden}
.modal-logo img{max-width:100%;max-height:100%;object-fit:contain}
.modal-head h3{font-size:24px;color:var(--navy-800);font-weight:700}
.modal-sub{font-size:14px;color:var(--muted);margin-top:4px}
.modal-sub span{color:var(--blue-500);font-weight:600}
.modal-gallery{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.modal-gallery.is-phone{grid-template-columns:1fr 1fr 1fr}
.modal-shot{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);background:var(--bg-alt)}
.modal-shot img{width:100%;height:auto;display:block}
.modal-shot.is-phone{background:var(--navy-800)}
.modal-shot.is-phone img{padding:14px}

/* ---------- 滚动显隐动画 ---------- */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:translateY(0)}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1080px){
  .client-wall{grid-template-columns:repeat(6,1fr)}
  .services-grid{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:960px){
  .hero{height:560px}
  .hero-title{font-size:38px}
  .hero-desc{font-size:16px}
  .section{padding:72px 0}
  .section-title{font-size:30px}
  .about-grid{grid-template-columns:1fr;gap:36px}
  .platform-grid{grid-template-columns:1fr}
  .case-grid{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr;gap:30px}
  .footer-inner{grid-template-columns:1fr;gap:24px}
  .footer-copy{text-align:left}
  .modal-gallery{grid-template-columns:1fr}
  .modal-gallery.is-phone{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  .topbar{display:none}
  .nav-toggle{display:flex}
  .nav-menu{
    position:fixed;top:var(--header-h);left:0;right:0;flex-direction:column;align-items:stretch;
    background:#fff;padding:14px 18px 24px;gap:2px;box-shadow:var(--shadow-lg);
    border-bottom:1px solid var(--line);
    transform:translateY(-130%);opacity:0;visibility:hidden;transition:transform .35s var(--ease),opacity .35s,visibility .35s;
    max-height:calc(100vh - var(--header-h));overflow-y:auto;
  }
  .nav-menu.open{transform:translateY(0);opacity:1;visibility:visible}
  .nav-link{padding:13px 14px;border-radius:8px}
  .nav-link::after{display:none}
  .nav-link:hover{background:var(--bg)}
  .nav-cta{margin:8px 0 0;text-align:center}
  .hero{height:520px}
  .hero-title{font-size:30px}
  .hero-desc{font-size:15px;margin-bottom:26px}
  .hero-actions{gap:12px}
  .btn{padding:12px 24px;font-size:14px}
  .hero-arrow{display:none}
  .stats-grid{grid-template-columns:1fr 1fr;gap:26px 12px}
  .stat-num{font-size:34px}
  .section{padding:60px 0}
  .section-title{font-size:26px}
  .section-head{margin-bottom:40px}
  .service-line{padding:30px 22px}
  .flow-chain{gap:6px}
  .flow-step{min-width:0;padding:16px 8px}
  .flow-stage{font-size:17px}
  .flow-arrow{display:none}
  .services-grid{grid-template-columns:1fr 1fr;gap:16px}
  .service-card{padding:24px 18px}
  .platform-info{padding:28px 22px 6px}
  .platform-shots{padding:18px 22px 28px}
  .case-grid{grid-template-columns:1fr;gap:20px}
  .contact-cards{grid-template-columns:1fr}
  .client-wall{grid-template-columns:repeat(4,1fr);gap:12px}
  .client-logo{padding:12px}
  .client-logo img{max-height:40px}
  .modal-box{padding:24px 18px}
  .modal-head{padding-right:40px}
  .modal-head h3{font-size:20px}
  .modal-gallery.is-phone{grid-template-columns:1fr 1fr}
  .vision-grid{grid-template-columns:1fr 1fr;gap:12px}
  .vision-card{padding:20px 12px}
  .vision-cn{font-size:22px}
}
@media (max-width:420px){
  .hero-title{font-size:26px}
  .services-grid{grid-template-columns:1fr}
  .client-wall{grid-template-columns:repeat(3,1fr)}
  .vision-grid{grid-template-columns:1fr}
  .pillars{flex-direction:column;align-items:flex-start}
  .modal-gallery.is-phone{grid-template-columns:1fr}
}

/* ---------- 减少动效（无障碍） ---------- */
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}