/* =========================================================
   昆仑AI安全团队 · 简约科技风官网样式
   v2.0  — 白底 / 细线 / 少阴影 / 单一强调色
   改动文字与图片无需动本文件，直接改 HTML 即可
   ========================================================= */

/* ---------- 设计变量 ---------- */
:root{
  /* 主色与点缀：柔和科技蓝 + 一点青色活力 */
  --brand:        #2563eb;
  --brand-dark:   #1d4ed8;
  --brand-soft:   #eef4ff;
  --brand-line:   #d9e5ff;
  --brand-2:      #06b6d4;

  /* 中性色：略带蓝调，降低冰冷感 */
  --ink:          #131a2e;
  --text:         #4a4f63;
  --muted:        #797e94;
  --line:         #e9ebf3;
  --line-soft:    #f2f4f9;
  --bg:           #ffffff;
  --bg-soft:      #f7f9fd;
  --bg-deep:      #111a31;
  --bg-deep-2:    #0d1426;

  /* 排版 */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
          'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;

  /* 圆角与阴影：圆润造型 + 更弥散的柔光 */
  --r-sm: 12px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-xl: 32px;
  --shadow: 0 10px 34px rgba(19,26,46,.06);
  --shadow-hover: 0 18px 46px rgba(19,26,46,.10);

  /* 布局 */
  --wrap: 1160px;
  --pad: 24px;
  --nav-h: 68px;
  --ease: cubic-bezier(.4,0,.2,1);
}

/* ---------- 基础重置 ---------- */
*,*::before,*::after{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; -webkit-font-smoothing:antialiased; }
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  font-size:15px;
  line-height:1.75;
}
img{ max-width:100%; display:block; height:auto; }
a{
  text-decoration:none; color:inherit;
}
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible{
  outline:2px solid var(--brand);
  outline-offset:3px;
}
ul{ list-style:none; }
::selection{ background:var(--brand); color:#fff; }

/* 滚动条 */
::-webkit-scrollbar{ width:8px; }
::-webkit-scrollbar-track{ background:var(--bg-soft); }
::-webkit-scrollbar-thumb{ background:#d4d4d8; border-radius:4px; }
::-webkit-scrollbar-thumb:hover{ background:#a1a1aa; }

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

/* ---------- 导航 ---------- */
.header{
  position:fixed; top:0; left:0; right:0;
  z-index:1000;
  background:rgba(255,255,255,.88);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.nav{
  height:var(--nav-h);
  display:flex; align-items:center; justify-content:space-between; gap:32px;
}
.logo{ display:flex; align-items:center; gap:10px; flex-shrink:0; }
.logo-img{ width:32px; height:32px; border-radius:var(--r-sm); object-fit:cover; }
.logo-text{
  font-size:17px; font-weight:700; color:var(--ink);
  letter-spacing:.2px; white-space:nowrap;
}
.menu{ display:flex; gap:30px; font-size:14px; font-weight:500; }
.menu a{ color:var(--text); position:relative; padding:4px 0; transition:color .2s var(--ease); }
.menu a::after{
  content:''; position:absolute; left:0; bottom:0; height:1.5px; width:0;
  background:var(--brand); transition:width .25s var(--ease);
}
.menu a:hover{ color:var(--ink); }
.menu a:hover::after{ width:100%; }
.menu a.active{ color:var(--brand); }
.menu a.active::after{ width:100%; }

.nav-btn{
  background:var(--brand); color:#fff;
  padding:9px 20px; border-radius:var(--r-sm);
  font-size:14px; font-weight:600; white-space:nowrap;
  transition:background .25s var(--ease), transform .25s var(--ease);
}
.nav-btn:hover{ background:var(--brand-dark); transform:translateY(-1px); }

/* 汉堡按钮 */
.burger{
  display:none; width:40px; height:40px;
  border:1px solid var(--line); background:#fff; border-radius:var(--r-sm);
  padding:0; cursor:pointer; flex-shrink:0;
}
.burger span{
  display:block; width:18px; height:1.5px; margin:4px auto;
  background:var(--ink); transition:.25s var(--ease);
}
.burger.active span:nth-child(1){ transform:translateY(5.5px) rotate(45deg); }
.burger.active span:nth-child(2){ opacity:0; }
.burger.active span:nth-child(3){ transform:translateY(-5.5px) rotate(-45deg); }

/* 移动菜单 */
.mobile-menu{ display:none; }

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:13px 28px; border-radius:var(--r-md);
  font-size:15px; font-weight:600; border:1px solid transparent;
  cursor:pointer; transition:all .25s var(--ease); white-space:nowrap;
}
.btn:active{ transform:translateY(0) scale(.985); }
.btn-primary{ background:var(--brand); color:#fff; }
.btn-primary:hover{ background:var(--brand-dark); transform:translateY(-2px); box-shadow:0 8px 20px rgba(29,78,216,.22); }
.btn-outline{ background:#fff; color:var(--ink); border-color:var(--line); }
.btn-outline:hover{ border-color:var(--ink); transform:translateY(-2px); }
.btn-light{ background:#fff; color:var(--ink); }
.btn-light:hover{ transform:translateY(-2px); }
.btn-ghost-dark{ background:transparent; color:#fff; border-color:rgba(255,255,255,.28); }
.btn-ghost-dark:hover{ border-color:#fff; background:rgba(255,255,255,.08); }
.btn-lg{ padding:15px 32px; font-size:16px; }
.btn-block{ width:100%; }

/* ---------- 区块通用 ---------- */
.section{ padding:104px 0; }
.section-alt{ background:var(--bg-soft); border-top:1px solid var(--line-soft); border-bottom:1px solid var(--line-soft); }
.section-head{ text-align:center; max-width:680px; margin:0 auto 60px; }
.eyebrow{
  display:inline-block; padding:5px 14px; border-radius:999px;
  background:var(--brand-soft); color:var(--brand);
  font-size:12px; font-weight:600; letter-spacing:.8px; text-transform:uppercase;
  margin-bottom:18px; border:1px solid var(--brand-line);
}
.section-head h2{
  font-size:34px; line-height:1.3; font-weight:700;
  color:var(--ink); letter-spacing:-.02em; margin-bottom:14px;
}
.section-head p{ font-size:16px; color:var(--muted); }

/* ---------- 首屏 ---------- */
.hero{
  padding:calc(var(--nav-h) + 92px) 0 88px;
  background:
    radial-gradient(1000px 480px at 50% -14%, #e6efff 0%, rgba(230,239,255,0) 68%),
    linear-gradient(180deg, #fbfcff 0%, #ffffff 62%);
  border-bottom:1px solid var(--line-soft);
  text-align:center;
  position:relative;
  overflow:hidden;
}
/* 首屏柔和网格：科技感，但不抢内容 */
.hero::before{
  content:''; position:absolute; inset:0; pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(37,99,235,.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(37,99,235,.05) 1px, transparent 1px);
  background-size:72px 72px;
  -webkit-mask-image:radial-gradient(760px 380px at 50% 4%, #000 0%, transparent 78%);
  mask-image:radial-gradient(760px 380px at 50% 4%, #000 0%, transparent 78%);
}
.hero > .wrap{ position:relative; z-index:1; }
.hero-badge{
  display:inline-flex; align-items:center; gap:8px;
  padding:6px 16px; border-radius:999px;
  background:rgba(255,255,255,.86); border:1px solid var(--line);
  font-size:13px; color:var(--muted); margin-bottom:26px;
  box-shadow:0 2px 10px rgba(17,21,39,.04);
  animation:riseIn .7s var(--ease) both;
}
.dot{ width:6px; height:6px; border-radius:50%; background:var(--brand); }
.hero h1{
  font-size:48px; line-height:1.24; font-weight:800;
  color:var(--ink); letter-spacing:-.025em; margin-bottom:20px;
  animation:riseIn .8s .06s var(--ease) both;
}
.hero h1 em{
  font-style:normal;
  color:var(--brand);
}
.hero-desc{
  font-size:17px; color:var(--muted); line-height:1.85;
  max-width:720px; margin:0 auto 28px;
  animation:riseIn .8s .12s var(--ease) both;
}
.hero-actions{
  display:flex; gap:14px; justify-content:center; flex-wrap:wrap; margin-bottom:22px;
  animation:riseIn .8s .18s var(--ease) both;
}
.quick-contact{ animation:riseIn .8s .24s var(--ease) both; }
.hero-chips{ animation:riseIn .8s .3s var(--ease) both; }
.hero-stats{ animation:riseIn .8s .36s var(--ease) both; }
.hero-chips{ display:flex; gap:8px; justify-content:center; flex-wrap:wrap; margin-bottom:56px; }
.chip{
  padding:6px 14px; border-radius:999px;
  background:rgba(255,255,255,.9); border:1px solid var(--line);
  font-size:13px; color:var(--muted);
  transition:all .25s var(--ease);
}
.chip:hover{ border-color:var(--brand-line); color:var(--brand); background:var(--brand-soft); }
.hero-stats{
  display:grid; grid-template-columns:repeat(4,1fr); gap:1px;
  background:var(--line); border:1px solid var(--line); border-radius:var(--r-md);
  overflow:hidden; max-width:900px; margin:0 auto;
}
.hero-stat{
  background:#fff; padding:24px 16px;
  transition:background .3s var(--ease);
}
.hero-stat:hover{ background:var(--brand-soft); }
.hero-stat strong em{
  font-style:normal; font-size:18px; font-weight:700; color:var(--brand);
  margin-left:2px;
}

/* 首屏客户信任条：小字、克制，不喧宾夺主 */
.trust-line{
  display:flex; align-items:center; justify-content:center; flex-wrap:wrap;
  gap:8px; margin:0 0 34px; font-size:14px; color:var(--muted);
  animation:riseIn .8s .32s var(--ease) both;
}
.trust-line b{ color:var(--ink); font-weight:700; }
.trust-dots{ display:inline-flex; gap:4px; margin-right:4px; }
.trust-dots i{
  width:6px; height:6px; border-radius:50%; background:var(--brand-line); display:block;
}
.trust-dots i:first-child{ background:var(--brand); }

/* ---------- 数据看板：客户数量与交付数据 ---------- */
.stats-band{
  padding:52px 0 60px;
  background:linear-gradient(180deg, #f6f9ff 0%, #ffffff 100%);
  border-bottom:1px solid var(--line-soft);
}
.stats-head{
  text-align:center; margin-bottom:28px;
  font-size:15px; color:var(--muted);
}
.stats-head b{ color:var(--ink); font-weight:700; }
.stats{ display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
.stat-item{
  text-align:center; padding:30px 18px 26px;
  background:#fff; border:1px solid var(--line);
  border-radius:var(--r-lg);
  box-shadow:0 6px 24px rgba(19,26,46,.04);
  transition:all .35s var(--ease);
}
.stat-item:hover{
  transform:translateY(-5px);
  border-color:var(--brand-line);
  box-shadow:0 18px 44px rgba(19,26,46,.09);
}
.stat-num{
  display:flex; align-items:baseline; justify-content:center; gap:2px;
  font-size:46px; font-weight:800; letter-spacing:-.035em;
  color:var(--ink); line-height:1.1; margin-bottom:10px;
}
.stat-num .plus{
  font-size:28px; font-weight:700; color:var(--brand); letter-spacing:0;
}
.stat-num .unit{
  font-size:18px; font-weight:700; color:var(--muted); letter-spacing:0; margin-left:2px;
}
.stat-label{ font-size:15px; font-weight:600; color:var(--ink); }
.stat-note{ font-size:12.5px; color:var(--muted); margin-top:5px; }
.hero-stat strong{
  display:block; font-size:26px; font-weight:700; color:var(--ink);
  letter-spacing:-.02em; line-height:1.3;
}
.hero-stat span{ font-size:13px; color:var(--muted); }

/* ---------- 服务卡片 ---------- */
.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.grid-2{ display:grid; grid-template-columns:repeat(2,1fr); gap:20px; }
.grid-4{ display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }

.svc-card{
  position:relative; overflow:hidden;
  background:#fff; border:1px solid var(--line);
  border-radius:var(--r-lg); padding:26px 24px;
  transition:all .3s var(--ease);
}
/* 轻量微交互：悬停时顶部浮出一条品牌色细线 */
.svc-card::after{
  content:''; position:absolute; top:0; left:0; right:0; height:3px;
  background:linear-gradient(90deg, var(--brand), var(--brand-2));
  opacity:0; transition:opacity .3s var(--ease);
}
.svc-card:hover{
  border-color:var(--brand-line);
  transform:translateY(-4px);
  box-shadow:var(--shadow-hover);
}
.svc-card:hover::after{ opacity:1; }
.svc-icon{
  width:44px; height:44px; border-radius:14px;
  background:var(--brand-soft); border:1px solid var(--brand-line);
  display:flex; align-items:center; justify-content:center;
  font-size:20px; margin-bottom:16px;
  transition:all .3s var(--ease);
}
.svc-card:hover .svc-icon{
  background:var(--brand); border-color:var(--brand);
  transform:translateY(-2px) scale(1.04);
}
.svc-card h3{ font-size:17px; font-weight:700; color:var(--ink); margin-bottom:8px; }
.svc-card p{ font-size:14px; color:var(--muted); line-height:1.75; }
.svc-tags{ display:flex; flex-wrap:wrap; gap:6px; margin-top:14px; }
.svc-tags span{
  font-size:12px; color:var(--muted);
  background:var(--bg-soft); border:1px solid var(--line-soft);
  padding:3px 9px; border-radius:6px;
}

/* ---------- 优势 / 特点 ---------- */
.feature-card{
  background:#fff; border:1px solid var(--line);
  border-radius:var(--r-lg); padding:28px 24px;
  transition:all .3s var(--ease);
}
.feature-card:hover{ border-color:var(--brand-line); box-shadow:var(--shadow); }
.feature-num{
  font-size:13px; font-weight:700; color:var(--brand);
  letter-spacing:.1em; margin-bottom:10px;
}
.feature-card h3{ font-size:18px; font-weight:700; color:var(--ink); margin-bottom:10px; }
.feature-card p{ font-size:14px; color:var(--muted); }

/* ---------- 流程步骤 ---------- */
.steps{ display:grid; grid-template-columns:repeat(4,1fr); gap:24px; }
.step{ position:relative; }
.step-no{
  width:36px; height:36px; border-radius:50%;
  border:1px solid var(--brand-line); background:var(--brand-soft);
  color:var(--brand); font-size:14px; font-weight:700;
  display:flex; align-items:center; justify-content:center; margin-bottom:16px;
}
.step h3{ font-size:16px; font-weight:700; color:var(--ink); margin-bottom:8px; }
.step p{ font-size:14px; color:var(--muted); }

/* ---------- 清单列表 ---------- */
.check-list{ display:grid; gap:10px; margin-top:14px; }
.check-list li{
  position:relative; padding-left:24px;
  font-size:14px; color:var(--text);
}
.check-list li::before{
  content:''; position:absolute; left:0; top:9px;
  width:6px; height:6px; border-radius:50%; background:var(--brand);
}

/* ---------- 实拍图 ---------- */
.shots{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.shot{
  background:#fff; border:1px solid var(--line);
  border-radius:var(--r-lg); overflow:hidden;
  transition:all .3s var(--ease);
}
.shot:hover{ transform:translateY(-4px); box-shadow:var(--shadow-hover); }
.shot img{ width:100%; }
.shot-cap{ padding:18px 20px; }
.shot-cap h4{ font-size:15px; font-weight:700; color:var(--ink); margin-bottom:6px; }
.shot-cap p{ font-size:13px; color:var(--muted); }

/* ---------- 技术栈条 ---------- */
.stack-row{
  display:flex; flex-wrap:wrap; gap:8px; justify-content:center;
}
.stack-row span{
  padding:8px 16px; border-radius:var(--r-sm);
  background:#fff; border:1px solid var(--line);
  font-size:14px; color:var(--text);
}

/* ---------- CTA ---------- */
.cta{ padding:0 0 96px; }
.cta-box{
  position:relative; overflow:hidden;
  background:linear-gradient(135deg, #16203c 0%, #1b2a55 52%, #131c34 100%);
  color:#fff;
  border-radius:var(--r-xl); padding:68px 32px; text-align:center;
  box-shadow:0 24px 60px rgba(17,21,39,.16);
}
.cta-box::before{
  content:''; position:absolute; top:-40%; left:50%; transform:translateX(-50%);
  width:620px; height:420px; pointer-events:none;
  background:radial-gradient(circle, rgba(96,148,255,.20) 0%, transparent 66%);
}
.cta-box > h2, .cta-box > p, .cta-box > .cta-actions{ position:relative; z-index:1; }
.cta-box h2{ font-size:30px; font-weight:700; letter-spacing:-.02em; margin-bottom:14px; }
.cta-box p{ color:#a1a1aa; font-size:16px; max-width:620px; margin:0 auto 30px; }
.cta-actions{ display:flex; gap:14px; justify-content:center; flex-wrap:wrap; }

/* ---------- 内页页头 ---------- */
.page-head{
  padding:calc(var(--nav-h) + 72px) 0 64px;
  text-align:center; border-bottom:1px solid var(--line-soft);
  background:radial-gradient(700px 300px at 50% -20%, #f2f6ff 0%, rgba(242,246,255,0) 70%), #fff;
}
.page-head h1{ font-size:40px; font-weight:800; color:var(--ink); letter-spacing:-.02em; margin-bottom:14px; }
.page-head p{ font-size:16px; color:var(--muted); max-width:680px; margin:0 auto; }

/* ---------- 关于页 ---------- */
.about-grid{
  display:grid; grid-template-columns:1fr 1.25fr; gap:48px; align-items:center;
}
.about-grid img{
  width:100%; border-radius:var(--r-lg); border:1px solid var(--line); object-fit:cover;
}
.about-text h3{ font-size:24px; font-weight:700; color:var(--ink); margin-bottom:14px; }
.about-text p{ margin-bottom:14px; }
.about-text strong{ color:var(--brand); font-weight:600; }

/* 时间轴 */
.timeline{ max-width:820px; margin:0 auto; }
.tl-item{
  display:grid; grid-template-columns:110px 1fr; gap:24px;
  padding:22px 0; border-top:1px solid var(--line);
}
.tl-item:last-child{ border-bottom:1px solid var(--line); }
.tl-year{ font-size:15px; font-weight:700; color:var(--brand); padding-top:2px; }
.tl-body h4{ font-size:17px; font-weight:700; color:var(--ink); margin-bottom:6px; }
.tl-body p{ font-size:14px; color:var(--muted); }

/* ---------- 联系卡片 ---------- */
.contact-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:20px; max-width:760px; margin:0 auto 56px; }
.contact-card{
  background:#fff; border:1px solid var(--line);
  border-radius:var(--r-lg); padding:26px 24px;
  transition:all .3s var(--ease);
}
.contact-card:hover{ border-color:var(--brand-line); box-shadow:var(--shadow); }
.contact-icon{
  width:40px; height:40px; border-radius:var(--r-sm);
  background:var(--brand-soft); border:1px solid var(--brand-line);
  display:flex; align-items:center; justify-content:center;
  font-size:18px; margin-bottom:14px;
}
.contact-card h4{ font-size:13px; font-weight:600; color:var(--muted); margin-bottom:6px; }
.contact-value{ font-size:17px; font-weight:700; color:var(--ink); }
.contact-sub{ font-size:13px; color:var(--muted); margin-top:4px; }
.wx-list{ display:flex; align-items:center; flex-wrap:wrap; gap:6px; }
.wx-id{
  background:var(--brand-soft); color:var(--brand);
  padding:2px 9px; border-radius:6px;
  font-size:15px; font-weight:700; cursor:pointer;
  transition:background .2s var(--ease);
}
.wx-id:hover{ background:var(--brand-line); }
.wx-sep{ color:#d4d4d8; }
.copy-hint{ font-size:12px; color:var(--muted); margin-top:8px; }

/* ---------- 表单 ---------- */
.form-card{
  max-width:720px; margin:0 auto;
  background:#fff; border:1px solid var(--line);
  border-radius:var(--r-lg); padding:36px 32px;
}
.form-head{ text-align:center; margin-bottom:26px; }
.form-head h3{ font-size:20px; font-weight:700; color:var(--ink); margin-bottom:6px; }
.form-head p{ font-size:14px; color:var(--muted); }
.form{ display:grid; gap:18px; }
.form-row{ display:grid; grid-template-columns:1fr 1fr; gap:18px; }
.field{ display:grid; gap:7px; }
.field label{ font-size:13px; font-weight:600; color:var(--text); }
.field label span{ color:#dc2626; }
.field input, .field select, .field textarea{
  width:100%; padding:12px 14px;
  border:1px solid var(--line); border-radius:var(--r-sm);
  font-family:var(--font); font-size:14px; color:var(--ink); background:#fff;
  transition:border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.field input:focus, .field select:focus, .field textarea:focus{
  outline:none; border-color:var(--brand); box-shadow:0 0 0 3px rgba(29,78,216,.10);
}
.field textarea{ resize:vertical; min-height:100px; }
.form-note{ font-size:12px; color:var(--muted); text-align:center; margin-top:12px; }

/* ---------- 页脚 ---------- */
.footer{ background:linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-deep-2) 100%); color:#a9b0c4; padding:64px 0 28px; }
.footer-top{
  display:grid; grid-template-columns:1.6fr 1fr 1fr 1.2fr; gap:40px;
  padding-bottom:40px; border-bottom:1px solid rgba(255,255,255,.08);
}
.footer-brand .logo-text{ color:#fff; }
.footer-brand p{ font-size:14px; color:#8b8b93; margin-top:14px; max-width:340px; }
.footer h4{ font-size:14px; font-weight:700; color:#fff; margin-bottom:16px; }
.footer li{ margin-bottom:10px; }
.footer li, .footer li a{ font-size:14px; color:#8b8b93; transition:color .2s var(--ease); }
.footer li a:hover{ color:#fff; }
.footer-bottom{
  padding-top:24px; display:flex; justify-content:space-between;
  gap:12px; font-size:13px; color:#71717a; flex-wrap:wrap;
}

/* ---------- 404 ---------- */
.error-code{ font-size:88px; font-weight:800; color:var(--ink); letter-spacing:-.04em; line-height:1; }
.error-box{ text-align:center; max-width:560px; margin:0 auto; }
.error-box h1{ font-size:28px; font-weight:700; color:var(--ink); margin:16px 0 12px; }
.error-box p{ color:var(--muted); margin-bottom:28px; }
.error-actions{ display:flex; gap:14px; justify-content:center; flex-wrap:wrap; }
.error-links{ margin-top:26px; font-size:14px; color:var(--muted); }
.error-links a{ color:var(--brand); }
.error-links span{ margin:0 8px; color:#d4d4d8; }

/* ---------- 回到顶部 ---------- */
.back-top{
  position:fixed; right:24px; bottom:24px;
  width:42px; height:42px; border-radius:50%;
  background:#fff; border:1px solid var(--line);
  color:var(--ink); font-size:16px; cursor:pointer;
  display:flex; align-items:center; justify-content:center;
  opacity:0; pointer-events:none; transition:all .3s var(--ease);
  box-shadow:var(--shadow); z-index:900;
}
.back-top.visible{ opacity:1; pointer-events:auto; }
.back-top:hover{ background:var(--ink); color:#fff; border-color:var(--ink); }

/* ---------- 滚动出现动画 ---------- */
.reveal{ opacity:0; transform:translateY(20px); transition:opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.visible{ opacity:1; transform:none; }
.d1{ transition-delay:.08s; } .d2{ transition-delay:.16s; } .d3{ transition-delay:.24s; }

/* 入场微动效：只做一次淡入上移，不循环、不炫技 */
@keyframes riseIn{
  from{ opacity:0; transform:translateY(14px); }
  to  { opacity:1; transform:none; }
}
@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
}

/* ---------- 首屏快捷联系 ---------- */
.quick-contact{
  display:flex; gap:20px; justify-content:center; flex-wrap:wrap;
  font-size:14px; color:var(--muted); margin-bottom:38px;
}
.quick-contact a{ color:var(--brand); font-weight:600; }
.quick-contact a:hover{ text-decoration:underline; }

/* ---------- 服务分组标题 ---------- */
.group-head{
  display:flex; align-items:baseline; gap:12px; flex-wrap:wrap;
  margin:48px 0 20px; padding-bottom:12px; border-bottom:1px solid var(--line);
}
.group-head:first-of-type{ margin-top:0; }
.group-head h3{ font-size:19px; font-weight:700; color:var(--ink); }
.group-head span{ font-size:13px; color:var(--muted); }

/* ---------- 板块内咨询条 ---------- */
.band{
  margin-top:44px; padding:22px 26px;
  border:1px dashed var(--line); border-radius:var(--r-lg);
  background:var(--bg-soft);
  display:flex; align-items:center; justify-content:space-between;
  gap:20px; flex-wrap:wrap;
}
.band p{ font-size:15px; color:var(--text); }
.band strong{ color:var(--ink); font-weight:600; }
.band-actions{ display:flex; gap:10px; flex-wrap:wrap; }

/* ---------- 常见问题 FAQ ---------- */
.faq-list{ max-width:840px; margin:0 auto; border-top:1px solid var(--line); }
.faq-item{ border-bottom:1px solid var(--line); }
.faq-q{
  width:100%; background:none; border:none; cursor:pointer;
  display:flex; align-items:center; justify-content:space-between; gap:20px;
  padding:20px 0; text-align:left;
  font-family:var(--font); font-size:16px; font-weight:600; color:var(--ink);
}
.faq-mark{
  flex-shrink:0; position:relative; width:22px; height:22px;
  border:1px solid var(--line); border-radius:50%;
}
.faq-mark::before, .faq-mark::after{
  content:''; position:absolute; left:50%; top:50%; background:var(--brand);
  transform:translate(-50%,-50%); transition:opacity .2s var(--ease);
}
.faq-mark::before{ width:9px; height:1.5px; }
.faq-mark::after{ width:1.5px; height:9px; }
.faq-item.open .faq-mark::after{ opacity:0; }
.faq-a{ max-height:0; overflow:hidden; transition:max-height .35s var(--ease); }
.faq-item.open .faq-a{ max-height:400px; }
.faq-a p{ padding:0 40px 20px 0; font-size:14px; color:var(--text); }

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .grid-3{ grid-template-columns:repeat(2,1fr); }
  .grid-4{ grid-template-columns:repeat(2,1fr); }
  .stats{ grid-template-columns:repeat(2,1fr); }
  .steps{ grid-template-columns:repeat(2,1fr); gap:28px; }
  .footer-top{ grid-template-columns:1fr 1fr; gap:32px; }
}
@media (max-width:768px){
  body{ padding-top:60px; }
  .nav{ height:60px; }
  .menu, .nav-btn{ display:none; }
  .burger{ display:block; }
  .mobile-menu{
    display:block; position:fixed; inset:60px 0 auto 0;
    background:#fff; border-bottom:1px solid var(--line);
    padding:12px 20px 20px;
    opacity:0; pointer-events:none; transform:translateY(-8px);
    transition:.25s var(--ease); z-index:999;
  }
  .mobile-menu.active{ opacity:1; pointer-events:auto; transform:none; }
  .mobile-menu a{
    display:block; padding:13px 4px; font-size:15px; color:var(--ink);
    border-bottom:1px solid var(--line-soft);
  }
  .mobile-menu .mobile-cta{
    margin-top:14px; background:var(--brand); color:#fff; text-align:center;
    border-radius:var(--r-sm); border:none; font-weight:600;
  }
  .hero{ padding:40px 0 48px; }
  .hero h1{ font-size:32px; }
  .hero-desc{ font-size:15px; }
  .hero-stats{ grid-template-columns:repeat(2,1fr); }
  .stats-band{ padding:36px 0 40px; }
  .stats{ grid-template-columns:repeat(2,1fr); gap:12px; }
  .stat-item{ padding:22px 12px 18px; }
  .stat-num{ font-size:34px; }
  .stat-num .plus{ font-size:22px; }
  .section{ padding:64px 0; }
  .section-head{ margin-bottom:36px; }
  .section-head h2{ font-size:26px; }
  .grid-3, .grid-4, .grid-2, .shots, .steps, .contact-grid{ grid-template-columns:1fr; }
  .about-grid{ grid-template-columns:1fr; gap:28px; }
  .page-head{ padding:40px 0 44px; }
  .page-head h1{ font-size:28px; }
  .cta-box{ padding:44px 20px; border-radius:var(--r-lg); }
  .cta-box h2{ font-size:24px; }
  .form-row{ grid-template-columns:1fr; }
  .form-card{ padding:26px 20px; }
  .tl-item{ grid-template-columns:1fr; gap:6px; }
  .footer-top{ grid-template-columns:1fr; gap:28px; }
  .error-code{ font-size:64px; }
  .band{ padding:20px; align-items:flex-start; }
  .band-actions{ width:100%; }
  .band-actions .btn{ flex:1; }
  .faq-q{ font-size:15px; padding:17px 0; }
  .group-head{ margin:36px 0 16px; }
}