/* =============================================================
 * 深圳勤思教育科技 · 官网样式
 * 设计基调：深色科技感 + 教育蓝 ｜ 移动端优先（基准 375px）
 * ============================================================= */

/* ---------- 设计变量 ---------- */
:root{
  --bg:#060B18;
  --bg-2:#0A1024;
  --bg-3:#0E1631;
  --line:rgba(255,255,255,.09);
  --line-2:rgba(255,255,255,.16);
  --card:rgba(255,255,255,.045);
  --card-2:rgba(255,255,255,.07);

  --blue:#2563EB;
  --blue-2:#3B82F6;
  --blue-3:#60A5FA;
  --cyan:#38BDF8;
  --glow:rgba(37,99,235,.45);

  --txt:#EAF0FB;
  --txt-2:#9AA9C4;
  --txt-3:#6B7A99;

  --radius:16px;
  --radius-s:12px;
  --maxw:1140px;
  --pad:20px;
}

*{ margin:0; padding:0; box-sizing:border-box; -webkit-tap-highlight-color:transparent; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body{
  background:var(--bg);
  color:var(--txt);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:15px; line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; border:0; }
a{ color:inherit; text-decoration:none; }
button{ font:inherit; color:inherit; background:none; border:0; cursor:pointer; }
ul{ list-style:none; }

.wrap{ width:100%; max-width:var(--maxw); margin:0 auto; padding:0 var(--pad); }

/* 背景光效（全站固定） */
.bg-fx{ position:fixed; inset:0; z-index:0; pointer-events:none; overflow:hidden; }
.bg-fx .orb{ position:absolute; border-radius:50%; filter:blur(90px); opacity:.5; }
.bg-fx .orb.a{ width:420px; height:420px; left:-160px; top:-120px; background:radial-gradient(circle,#1D4ED8,transparent 70%); }
.bg-fx .orb.b{ width:380px; height:380px; right:-150px; top:32%; background:radial-gradient(circle,#0EA5E9,transparent 70%); opacity:.34; }
.bg-fx .orb.c{ width:460px; height:460px; left:20%; bottom:-180px; background:radial-gradient(circle,#3730A3,transparent 70%); opacity:.32; }
.bg-fx .grid{
  position:absolute; inset:0;
  background-image:linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.028) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 30%,transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 30%,transparent 78%);
}
main{ position:relative; z-index:1; }

/* ---------- 顶部导航 ---------- */
.nav{
  position:fixed; top:0; left:0; right:0; z-index:60;
  height:58px; display:flex; align-items:center;
  background:rgba(6,11,24,.72);
  backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent; transition:.3s;
}
.nav.scrolled{ border-bottom-color:var(--line); background:rgba(6,11,24,.9); }
.nav .wrap{ display:flex; align-items:center; gap:12px; }
.logo{ display:flex; align-items:center; gap:9px; min-width:0; }
.logo .mark{
  width:40px; height:40px; border-radius:10px; flex-shrink:0;
  object-fit:contain; background:#fff; padding:3px;
  box-shadow:0 4px 14px rgba(0,0,0,.4);
}
.logo .txt{ min-width:0; }
.logo b{ display:block; font-size:15px; letter-spacing:.5px; line-height:1.25; white-space:nowrap; }
.logo i{ display:block; font-size:10px; color:var(--txt-3); font-style:normal; letter-spacing:.4px; }
.nav nav{ display:none; margin-left:auto; gap:4px; }
.nav nav a{ padding:8px 13px; font-size:14px; color:var(--txt-2); border-radius:8px; transition:.2s; }
.nav nav a:hover{ color:#fff; background:var(--card-2); }
.nav .btn-consult{ margin-left:auto; }
.nav nav + .btn-consult{ margin-left:10px; }

.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:7px;
  height:44px; padding:0 20px; border-radius:11px;
  font-size:15px; font-weight:600; white-space:nowrap; transition:.25s;
}
.btn-sm{ height:36px; padding:0 15px; font-size:13px; border-radius:9px; }
.btn-primary{
  background:linear-gradient(135deg,var(--blue),var(--blue-2)); color:#fff;
  box-shadow:0 8px 22px rgba(37,99,235,.38);
}
.btn-primary:active{ transform:scale(.97); }
.btn-ghost{ border:1px solid var(--line-2); color:var(--txt); background:var(--card); }
.btn-ghost:active{ transform:scale(.97); }
.btn-lg{ height:50px; padding:0 28px; font-size:16px; border-radius:13px; }
.btn-block{ width:100%; }

/* ---------- 通用区块 ---------- */
section{ position:relative; padding:64px 0; }
.sec-head{ margin-bottom:34px; }
.sec-tag{
  display:inline-flex; align-items:center; gap:6px;
  font-size:12px; letter-spacing:1.4px; font-weight:700;
  color:var(--blue-3); text-transform:uppercase; margin-bottom:12px;
}
.sec-tag::before{ content:""; width:16px; height:2px; background:var(--blue-3); border-radius:2px; }
h2.sec-title{ font-size:26px; line-height:1.35; letter-spacing:.6px; font-weight:800; }
h2.sec-title .hl{
  background:linear-gradient(100deg,var(--blue-3),var(--cyan));
  -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent;
}
p.sec-sub{ color:var(--txt-2); font-size:14.5px; margin-top:12px; }

/* 卡片基础 */
.card{
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:22px; backdrop-filter:blur(6px); -webkit-backdrop-filter:blur(6px);
  transition:transform .3s,border-color .3s,background .3s;
}
.card:hover{ border-color:rgba(96,165,250,.34); background:var(--card-2); }

/* 入场动画 */
.reveal{ opacity:0; transform:translateY(26px); transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.3,1); }
.reveal.in{ opacity:1; transform:none; }

/* ---------- 首屏 Hero ---------- */
.hero{ padding:96px 0 56px; }
.hero-inner{ display:flex; flex-direction:column; gap:34px; }
.badge-line{
  display:inline-flex; align-items:center; gap:8px; align-self:flex-start;
  border:1px solid rgba(96,165,250,.32); background:rgba(37,99,235,.12);
  border-radius:999px; padding:6px 14px; font-size:12.5px; color:var(--blue-3);
}
.badge-line .dot{ width:7px; height:7px; border-radius:50%; background:#22C55E; box-shadow:0 0 0 4px rgba(34,197,94,.16); }

h1.hero-title{
  font-size:29px; line-height:1.34; letter-spacing:.8px; font-weight:800; margin-top:16px;
}
h1.hero-title .grad{
  display:block;
  background:linear-gradient(100deg,#7DD3FC,#3B82F6 45%,#6366F1);
  -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent;
}
.hero-desc{ color:var(--txt-2); font-size:15px; margin-top:16px; }
.hero-btns{ display:flex; flex-direction:column; gap:12px; margin-top:26px; }
.hero-note{ font-size:12.5px; color:var(--txt-3); display:flex; align-items:center; gap:7px; margin-top:16px; }
.hero-note svg{ flex-shrink:0; }

/* 数据条 */
.metrics{ display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-top:30px; }
.metric{
  background:linear-gradient(160deg,rgba(37,99,235,.16),rgba(255,255,255,.03));
  border:1px solid var(--line); border-radius:var(--radius-s); padding:16px 14px;
}
.metric b{
  display:block; font-size:26px; font-weight:800; letter-spacing:.5px; line-height:1.2;
  background:linear-gradient(100deg,#BFDBFE,#60A5FA);
  -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent;
  font-variant-numeric:tabular-nums;
}
.metric span{ display:block; font-size:12.5px; color:var(--txt-2); margin-top:6px; }

/* 手机样机舞台 */
.stage{
  position:relative; display:flex; align-items:center; justify-content:center;
  min-height:400px; perspective:1400px; margin-top:8px;
}
.stage .halo{
  position:absolute; width:280px; height:280px; border-radius:50%;
  background:radial-gradient(circle,rgba(37,99,235,.44),transparent 66%);
  filter:blur(34px);
}
.phone{
  position:relative; width:216px; border-radius:30px; padding:8px;
  background:linear-gradient(160deg,#222C45,#0B1222);
  box-shadow:0 26px 60px rgba(0,0,0,.62), 0 0 0 1px rgba(255,255,255,.09) inset;
  transform-style:preserve-3d;
}
.phone::after{
  content:""; position:absolute; top:14px; left:50%; transform:translateX(-50%);
  width:66px; height:6px; border-radius:6px; background:#0A0F1D; z-index:4;
}
.phone .screen{
  position:relative; border-radius:23px; overflow:hidden; background:#0A0F1D;
  aspect-ratio:521 / 979;
}
.phone .screen img{
  position:absolute; inset:0; width:100%; height:100%; object-fit:cover; object-position:top center;
  opacity:0; transition:opacity .8s ease;
}
.phone .screen img.on{ opacity:1; }
.phone .glass{
  position:absolute; inset:0; pointer-events:none; z-index:3;
  background:linear-gradient(115deg,rgba(255,255,255,.16),transparent 34%,transparent 62%,rgba(255,255,255,.07));
}
/* 副机位（背后两台） */
.phone.side{
  position:absolute; width:172px; padding:6px; border-radius:26px;
  filter:brightness(.88) saturate(.95);
}
.phone.side .screen{ border-radius:20px; }
.phone.side::after{ width:52px; height:5px; top:11px; }
.phone.left{ left:-2%; top:34px; transform:rotateY(24deg) rotateZ(-6deg) scale(.94); }
.phone.right{ right:-2%; top:66px; transform:rotateY(-24deg) rotateZ(6deg) scale(.94); }
.phone.main{ z-index:2; transform:rotateY(0deg); }

/* ---------- 交付实力 ---------- */
.strengths{ display:grid; gap:14px; }
.strength{ display:flex; gap:15px; align-items:flex-start; }
.strength .ico{
  width:44px; height:44px; border-radius:12px; flex-shrink:0;
  display:grid; place-items:center;
  background:linear-gradient(135deg,rgba(37,99,235,.3),rgba(56,189,248,.16));
  border:1px solid rgba(96,165,250,.28); color:var(--blue-3);
}
.strength h3{ font-size:16.5px; margin-bottom:7px; }
.strength p{ font-size:13.8px; color:var(--txt-2); line-height:1.72; }

/* ---------- 能力矩阵 ---------- */
.caps{ display:grid; gap:12px; }
.cap-group{ padding:18px 18px 16px; }
.cap-group .gt{
  display:flex; align-items:center; gap:9px; font-size:14.5px; font-weight:700; margin-bottom:13px;
}
.cap-group .gt .bar{ width:3px; height:15px; border-radius:2px; background:linear-gradient(var(--blue-3),var(--cyan)); }
.chips{ display:flex; flex-wrap:wrap; gap:8px; }
.chip{
  font-size:12.6px; color:var(--txt-2); padding:7px 12px; border-radius:9px;
  background:rgba(255,255,255,.045); border:1px solid var(--line);
  transition:.22s;
}
.chip:hover{ color:#fff; border-color:rgba(96,165,250,.4); background:rgba(37,99,235,.16); }

/* ---------- 案例展示 ---------- */
.case-scroller{
  display:flex; gap:16px; overflow-x:auto; scroll-snap-type:x mandatory;
  padding:4px 0 18px; margin:0 calc(var(--pad) * -1); padding-left:var(--pad); padding-right:var(--pad);
  scrollbar-width:none;
}
.case-scroller::-webkit-scrollbar{ display:none; }
.case-card{
  flex:0 0 86%; max-width:400px; scroll-snap-align:center;
  background:linear-gradient(165deg,rgba(255,255,255,.07),rgba(255,255,255,.025));
  border:1px solid var(--line); border-radius:20px; padding:18px; display:flex; flex-direction:column; gap:16px;
}
.case-head{ display:flex; align-items:flex-start; gap:12px; }
.case-head .idx{
  font-size:12px; font-weight:800; color:var(--blue-3); letter-spacing:1px;
  border:1px solid rgba(96,165,250,.3); border-radius:8px; padding:4px 8px; flex-shrink:0;
}
.case-head h3{ font-size:17px; }
.case-head .tagline{ font-size:12.5px; color:var(--txt-3); margin-top:3px; }
.case-badge{
  margin-left:auto; flex-shrink:0; font-size:11.5px; font-weight:700;
  color:#C7D2FE; background:rgba(99,102,241,.2); border:1px solid rgba(129,140,248,.34);
  padding:5px 9px; border-radius:8px; white-space:nowrap;
}
.case-views{ display:flex; justify-content:center; padding:6px 0 2px; }
.case-views .phone .screen.zoomable{ cursor:zoom-in; }
.case-desc{ font-size:13.6px; color:var(--txt-2); line-height:1.75; }
.case-hl{ display:flex; flex-wrap:wrap; gap:7px; }
.case-hl span{
  font-size:12px; color:#BFDBFE; background:rgba(37,99,235,.18);
  border:1px solid rgba(96,165,250,.24); padding:5px 10px; border-radius:8px;
}
.thumbs{ display:flex; gap:8px; overflow-x:auto; scrollbar-width:none; padding-bottom:2px; }
.thumbs::-webkit-scrollbar{ display:none; }
.thumb{
  flex:0 0 46px; height:84px; border-radius:9px; overflow:hidden; cursor:pointer;
  border:1.5px solid transparent; opacity:.55; transition:.25s; background:#0A0F1D;
}
.thumb img{ width:100%; height:100%; object-fit:cover; object-position:top center; }
.thumb.on{ opacity:1; border-color:var(--blue-3); box-shadow:0 0 0 3px rgba(59,130,246,.18); }

/* 笔记本电脑样机（网站案例） */
.laptop{ width:100%; max-width:400px; margin:0 auto; }
.laptop .lid{
  border-radius:12px 12px 4px 4px; padding:9px 9px 12px;
  background:linear-gradient(160deg,#232E48,#0B1222);
  box-shadow:0 22px 50px rgba(0,0,0,.6), 0 0 0 1px rgba(255,255,255,.08) inset;
}
.laptop .scr{
  border-radius:6px; overflow:hidden; background:#fff; aspect-ratio:16/10; position:relative;
}
.laptop .scr iframe{ width:1000px; height:625px; border:0; transform-origin:0 0; }
.laptop .base{
  height:11px; margin:0 -18px; border-radius:0 0 12px 12px;
  background:linear-gradient(#1B2338,#0D1425);
  box-shadow:0 10px 20px rgba(0,0,0,.5), 0 0 0 1px rgba(255,255,255,.05) inset;
  position:relative;
}
.laptop .base::after{
  content:""; position:absolute; left:50%; top:0; transform:translateX(-50%);
  width:22%; height:4px; border-radius:0 0 6px 6px; background:rgba(255,255,255,.09);
}

/* 轮播指示点 */
.dots{ display:flex; justify-content:center; gap:7px; margin-top:14px; }
.dots i{ width:7px; height:7px; border-radius:50%; background:rgba(255,255,255,.2); transition:.3s; }
.dots i.on{ width:20px; border-radius:4px; background:var(--blue-3); }

/* ---------- 交付模式 ---------- */
.modes{ display:grid; gap:14px; }
.mode{ position:relative; padding:24px 20px; }
.mode.hl{
  border-color:rgba(96,165,250,.42);
  background:linear-gradient(165deg,rgba(37,99,235,.2),rgba(255,255,255,.03));
  box-shadow:0 16px 44px rgba(37,99,235,.2);
}
.mode .flag{
  position:absolute; top:-11px; right:18px; font-size:11px; font-weight:700; letter-spacing:.5px;
  background:linear-gradient(100deg,var(--blue),var(--cyan)); color:#fff;
  padding:4px 11px; border-radius:999px;
}
.mode .k{
  display:inline-grid; place-items:center; width:30px; height:30px; border-radius:9px;
  background:rgba(37,99,235,.24); border:1px solid rgba(96,165,250,.3);
  font-weight:800; font-size:14px; color:var(--blue-3); margin-bottom:12px;
}
.mode h3{ font-size:18px; margin-bottom:6px; }
.mode .suit{ font-size:12.8px; color:var(--txt-3); margin-bottom:16px; }
.mode ul{ display:grid; gap:10px; }
.mode li{ display:flex; gap:9px; font-size:13.6px; color:var(--txt-2); line-height:1.65; }
.mode li svg{ flex-shrink:0; margin-top:4px; color:var(--blue-3); }

/* ---------- 服务流程 ---------- */
.timeline{ position:relative; padding-left:34px; }
.timeline::before{
  content:""; position:absolute; left:11px; top:8px; bottom:8px; width:2px;
  background:linear-gradient(var(--blue),rgba(56,189,248,.4),transparent);
}
.tl-item{ position:relative; padding-bottom:24px; }
.tl-item:last-child{ padding-bottom:0; }
.tl-item .no{
  position:absolute; left:-34px; top:0; width:24px; height:24px; border-radius:50%;
  display:grid; place-items:center; font-size:11px; font-weight:800; color:#fff;
  background:linear-gradient(135deg,var(--blue),var(--blue-2));
  box-shadow:0 0 0 4px rgba(37,99,235,.15);
}
.tl-item h4{ font-size:15.5px; margin-bottom:5px; }
.tl-item p{ font-size:13.4px; color:var(--txt-2); }

.guarantees{ display:grid; gap:12px; margin-top:26px; }
.gt-item{ display:flex; gap:13px; padding:18px 16px; }
.gt-item .ico{
  width:38px; height:38px; border-radius:11px; flex-shrink:0; display:grid; place-items:center;
  background:rgba(37,99,235,.18); border:1px solid rgba(96,165,250,.26); color:var(--blue-3);
}
.gt-item h4{ font-size:14.8px; margin-bottom:5px; }
.gt-item p{ font-size:13px; color:var(--txt-2); }

/* ---------- FAQ ---------- */
.faq{ display:grid; gap:10px; }
.faq-item{ border:1px solid var(--line); border-radius:var(--radius-s); background:var(--card); overflow:hidden; }
.faq-item summary{
  list-style:none; cursor:pointer; padding:16px 46px 16px 16px; position:relative;
  font-size:14.6px; font-weight:600; line-height:1.6;
}
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary::after{
  content:""; position:absolute; right:18px; top:50%; width:9px; height:9px;
  border-right:2px solid var(--txt-3); border-bottom:2px solid var(--txt-3);
  transform:translateY(-70%) rotate(45deg); transition:.3s;
}
.faq-item[open]{ border-color:rgba(96,165,250,.36); background:var(--card-2); }
.faq-item[open] summary::after{ transform:translateY(-30%) rotate(-135deg); border-color:var(--blue-3); }
.faq-item .ans{ padding:0 16px 17px; font-size:13.6px; color:var(--txt-2); line-height:1.78; }

/* ---------- CTA ---------- */
.cta{ padding:64px 0 96px; }
.cta-box{
  position:relative; overflow:hidden; text-align:center;
  border-radius:22px; padding:34px 20px;
  background:linear-gradient(160deg,rgba(37,99,235,.26),rgba(14,22,49,.9));
  border:1px solid rgba(96,165,250,.3);
}
.cta-box::before{
  content:""; position:absolute; width:320px; height:320px; border-radius:50%;
  background:radial-gradient(circle,rgba(56,189,248,.34),transparent 68%);
  top:-140px; left:50%; transform:translateX(-50%); filter:blur(20px);
}
.cta-box > *{ position:relative; }
.cta-box h2{ font-size:24px; line-height:1.4; }
.cta-box p{ color:var(--txt-2); font-size:14px; margin-top:12px; }
.qr-wrap{
  width:172px; height:172px; margin:24px auto 14px; border-radius:16px; padding:8px;
  background:#fff; box-shadow:0 16px 40px rgba(0,0,0,.42);
}
.qr-wrap img{ width:100%; height:100%; object-fit:contain; border-radius:9px; }
.copy-row{
  display:flex; align-items:center; justify-content:center; gap:10px; flex-wrap:wrap;
  margin-top:6px;
}
.wx-id{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace; font-size:15px; letter-spacing:1px;
  background:rgba(0,0,0,.34); border:1px dashed rgba(96,165,250,.44);
  padding:11px 16px; border-radius:11px; color:#BFDBFE;
}

/* ---------- 图片放大查看器 ---------- */
.lightbox{
  position:fixed; inset:0; z-index:120; display:none;
  align-items:center; justify-content:center;
  background:rgba(3,6,14,.94);
  backdrop-filter:blur(8px); -webkit-backdrop-filter:blur(8px);
}
.lightbox.show{ display:flex; }
.lightbox img{
  max-width:88vw; max-height:84vh; border-radius:14px;
  box-shadow:0 30px 80px rgba(0,0,0,.7);
  animation:pop .28s cubic-bezier(.2,.9,.3,1.15);
}
.lb-close{
  position:absolute; top:14px; right:16px; width:44px; height:44px;
  border-radius:50%; font-size:26px; line-height:1; color:var(--txt);
  background:var(--card-2); border:1px solid var(--line-2);
}
.lb-nav{
  position:absolute; top:50%; transform:translateY(-50%);
  width:46px; height:46px; border-radius:50%; font-size:26px; color:var(--txt);
  background:var(--card-2); border:1px solid var(--line-2);
}
.lb-prev{ left:12px; }
.lb-next{ right:12px; }
.lb-count{
  position:absolute; bottom:calc(18px + env(safe-area-inset-bottom)); left:50%; transform:translateX(-50%);
  font-size:13px; color:var(--txt-2); background:var(--card-2);
  border:1px solid var(--line); padding:6px 14px; border-radius:999px;
  font-variant-numeric:tabular-nums;
}
@media (max-width:560px){
  .lightbox img{ max-width:94vw; }
  .lb-prev{ left:6px; } .lb-next{ right:6px; }
  .lb-nav{ width:40px; height:40px; }
}

/* ---------- 吸底咨询条 ---------- */
.dock{
  position:fixed; left:0; right:0; bottom:0; z-index:70;
  padding:10px var(--pad) calc(10px + env(safe-area-inset-bottom));
  background:linear-gradient(to top,rgba(6,11,24,.98),rgba(6,11,24,.86) 70%,transparent);
  display:flex; align-items:center; gap:12px;
  transform:translateY(130%); transition:transform .4s cubic-bezier(.2,.7,.3,1);
}
.dock.show{ transform:none; }
.dock .info{ min-width:0; flex:1; }
.dock .info b{ display:block; font-size:13.5px; }
.dock .info span{ font-size:11.5px; color:var(--txt-3); }
.dock .btn{ flex-shrink:0; height:42px; padding:0 18px; font-size:14px; }

/* ---------- 二维码弹层 ---------- */
.modal{
  position:fixed; inset:0; z-index:100; display:none;
  align-items:center; justify-content:center; padding:24px;
  background:rgba(3,6,14,.82); backdrop-filter:blur(7px); -webkit-backdrop-filter:blur(7px);
}
.modal.show{ display:flex; }
.modal .box{
  width:100%; max-width:320px; text-align:center; padding:26px 22px 22px;
  border-radius:20px; border:1px solid var(--line-2);
  background:linear-gradient(165deg,#131C36,#0A1024);
  box-shadow:0 30px 70px rgba(0,0,0,.65);
  animation:pop .32s cubic-bezier(.2,.9,.3,1.2);
}
@keyframes pop{ from{ opacity:0; transform:scale(.9) translateY(12px); } }
.modal h3{ font-size:17px; margin-bottom:5px; }
.modal p{ font-size:12.8px; color:var(--txt-3); margin-bottom:18px; }
.modal .qr-wrap{ margin:0 auto 16px; }
.modal .close{ margin-top:12px; font-size:13px; color:var(--txt-3); }

/* ---------- 页脚 ---------- */
footer{ border-top:1px solid var(--line); padding:30px 0 78px; }
footer .cols{ display:grid; gap:18px; }
footer .brand{ display:flex; align-items:center; gap:10px; }
footer .brand .mark{
  width:36px; height:36px; border-radius:9px; object-fit:contain;
  background:#fff; padding:2px;
}
footer .brand b{ font-size:14px; }
footer .meta{ font-size:12.4px; color:var(--txt-3); line-height:1.9; }
footer .meta a{ color:var(--txt-2); }

/* ---------- 平板 / 桌面适配（仅放大居中，不做第二套布局） ---------- */
@media (min-width:560px){
  .hero-btns{ flex-direction:row; }
  .metrics{ grid-template-columns:repeat(2,minmax(0,1fr)); max-width:420px; }
  .strengths{ grid-template-columns:1fr; }
}
@media (min-width:900px){
  :root{ --pad:28px; }
  body{ font-size:15.5px; }
  section{ padding:84px 0; }
  .nav{ height:66px; }
  .nav nav{ display:flex; }
  .logo b{ font-size:16px; }
  h1.hero-title{ font-size:46px; }
  .hero{ padding:132px 0 80px; }
  .hero-inner{ flex-direction:row; align-items:center; gap:40px; }
  .hero-copy{ flex:1 1 54%; }
  .hero-visual{ flex:1 1 46%; }
  .stage{ min-height:470px; transform:scale(1.06); }
  h2.sec-title{ font-size:32px; }
  p.sec-sub{ font-size:15.5px; }
  .sec-head{ margin-bottom:46px; }
  .strengths{ grid-template-columns:repeat(3,1fr); gap:18px; }
  .caps{ grid-template-columns:repeat(2,1fr); gap:16px; }
  .case-card{ flex:0 0 380px; }
  .modes{ grid-template-columns:1fr 1fr; gap:20px; max-width:940px; margin:0 auto; }
  .process-wrap{ display:grid; grid-template-columns:1.05fr .95fr; gap:44px; }
  .guarantees{ grid-template-columns:1fr 1fr; margin-top:0; }
  .cta-box{ padding:56px 40px; }
  .cta-box h2{ font-size:30px; }
  footer .cols{ grid-template-columns:1.4fr 1fr 1fr; align-items:start; }
  footer .meta{ text-align:right; }
  .dock{ display:none; }
}

/* ---------- 无障碍 / 低端机降级 ---------- */
@media (prefers-reduced-motion:reduce){
  *{ animation:none !important; transition:none !important; }
  .reveal{ opacity:1; transform:none; }
  html{ scroll-behavior:auto; }
}