```css
:root{
  --ink:#0a0a0a;
  --ink-soft:#1e1e1e;
  --gray-1:#4d4d4d;
  --gray-2:#8b8b8b;
  --gray-3:#c4c4c4;
  --line:#e4e4e2;
  --line-soft:#efefed;
  --paper:#ffffff;
  --paper-2:#f6f6f4;
  --serif:"Songti SC","Noto Serif SC","Source Han Serif SC","STSong",Georgia,"Times New Roman",serif;
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,"Helvetica Neue",Arial,sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow:0 24px 60px -40px rgba(0,0,0,.35);
}

*,*::before,*::after{box-sizing:border-box;}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}

body{
  margin:0;
  padding:0;
  background:var(--paper);
  color:var(--ink-soft);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.78;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

img{max-width:100%;display:block;border:0;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;}
h1,h2,h3,h4,h5,p,ul,ol{margin:0;}
ul,ol{list-style:none;padding:0;}

::selection{background:var(--ink);color:#fff;}

/* ============ 布局 ============ */
.container{
  width:100%;
  max-width:1220px;
  margin:0 auto;
  padding:0 32px;
}

.section{
  position:relative;
  padding:118px 0;
}

.section + .section{border-top:1px solid var(--line-soft);}

.section-label{
  display:inline-flex;
  align-items:center;
  gap:14px;
  font-size:11px;
  font-weight:600;
  letter-spacing:.34em;
  text-transform:uppercase;
  color:var(--gray-2);
  margin-bottom:26px;
}
.section-label::before{
  content:"";
  display:block;
  width:34px;
  height:1px;
  background:var(--ink);
  flex:0 0 auto;
}

.section-title{
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(30px,3.9vw,52px);
  line-height:1.18;
  letter-spacing:-.01em;
  color:var(--ink);
  margin-bottom:22px;
  max-width:22ch;
}

.section-desc{
  font-size:16px;
  line-height:1.95;
  color:var(--gray-1);
  max-width:60ch;
  margin-bottom:0;
}

/* ============ 导航 ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:200;
  background:rgba(255,255,255,.94);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}

.header-inner{
  width:100%;
  max-width:1220px;
  margin:0 auto;
  padding:0 32px;
  min-height:86px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:44px;
}

.logo{
  display:inline-flex;
  align-items:center;
  gap:13px;
  font-family:var(--serif);
  font-size:21px;
  font-weight:600;
  letter-spacing:.05em;
  color:var(--ink);
  white-space:nowrap;
}

.logo-icon{
  width:34px;
  height:34px;
  flex:0 0 auto;
  display:grid;
  place-items:center;
  background:var(--ink);
  color:#fff;
  font-family:var(--serif);
  font-size:16px;
  line-height:1;
  letter-spacing:0;
  transition:background .4s var(--ease);
}

.logo:hover .logo-icon{background:var(--gray-1);}

.main-nav{
  display:flex;
  align-items:center;
  gap:38px;
  margin-left:auto;
}

.main-nav a{
  position:relative;
  display:inline-block;
  padding:6px 0;
  font-size:14px;
  letter-spacing:.1em;
  color:var(--gray-1);
  transition:color .35s var(--ease);
}
.main-nav a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:1px;
  background:var(--ink);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .45s var(--ease);
}
.main-nav a:hover{color:var(--ink);}
.main-nav a:hover::after{transform:scaleX(1);}

.nav-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:12px 26px;
  margin-left:10px;
  background:var(--ink);
  color:#fff;
  font-size:13px;
  letter-spacing:.14em;
  line-height:1;
  border:1px solid var(--ink);
  transition:background .4s var(--ease),color .4s var(--ease);
}
.nav-cta:hover{background:#fff;color:var(--ink);}

.menu-toggle{
  display:none;
  width:40px;
  height:40px;
  padding:0;
  background:none;
  border:1px solid var(--line);
  position:relative;
  cursor:pointer;
  transition:border-color .35s var(--ease);
}
.menu-toggle::before{
  content:"";
  position:absolute;
  left:50%;
  top:50%;
  width:16px;
  height:1px;
  background:var(--ink);
  transform:translate(-50%,-50%);
  box-shadow:0 -5px 0 var(--ink),0 5px 0 var(--ink);
}
.menu-toggle:hover{border-color:var(--ink);}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:16px 40px;
  font-size:14px;
  letter-spacing:.14em;
  line-height:1;
  border:1px solid transparent;
  cursor:pointer;
  transition:background .4s var(--ease),color .4s var(--ease),border-color .4s var(--ease),transform .4s var(--ease);
}

.btn-primary{
  background:var(--ink);
  color:#fff;
  border-color:var(--ink);
}
.btn-primary:hover{
  background:#fff;
  color:var(--ink);
  transform:translateY(-2px);
}

.btn-outline{
  background:transparent;
  color:var(--ink);
  border-color:var(--ink);
}
.btn-outline:hover{
  background:var(--ink);
  color:#fff;
  transform:translateY(-2px);
}

/* ============ 首页 Hero ============ */
.hero{
  position:relative;
  padding:132px 0 128px;
  background:var(--paper);
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute;
  top:0;
  left:50%;
  width:1px;
  height:100%;
  background:var(--line-soft);
  transform:translateX(-50%);
  pointer-events:none;
  z-index:0;
}

.hero .container{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:1.05fr .95fr;
  gap:78px;
  align-items:center;
}

.hero-content{max-width:620px;}

.hero-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:14px;
  font-size:11px;
  font-weight:600;
  letter-spacing:.36em;
  color:var(--gray-2);
  margin-bottom:32px;
}
.hero-eyebrow::before{
  content:"";
  width:44px;
  height:1px;
  background:var(--ink);
}

.hero-content h1,
.hero-title{
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(40px,5.6vw,76px);
  line-height:1.1;
  letter-spacing:-.02em;
  color:var(--ink);
  margin-bottom:28px;
}

.hero-content p,
.hero-text{
  font-size:17px;
  line-height:1.95;
  color:var(--gray-1);
  max-width:46ch;
}

.hero-buttons{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:18px;
  margin-top:46px;
}

.hero-image{
  position:relative;
  overflow:hidden;
  background:var(--paper-2);
  border:1px solid var(--line);
  aspect-ratio:4/3;
}
.hero-image img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:grayscale(1) contrast(1.08);
  transition:transform 1.1s var(--ease),filter .8s var(--ease);
}
.hero-image:hover img{
  transform:scale(1.035);
  filter:grayscale(.15) contrast(1.05);
}
.hero-image::after{
  content:"";
  position:absolute;
  inset:14px;
  border:1px solid rgba(255,255,255,.5);
  pointer-events:none;
  opacity:.55;
}

/* ============ 卡片 ============ */
.cards-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
  margin-top:66px;
}

.category-card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:18px;
  padding:52px 40px 46px;
  background:var(--paper);
  transition:background .5s var(--ease);
}
.category-card::after{
  content:"";
  position:absolute;
  left:0;
  top:0;
  width:100%;
  height:2px;
  background:var(--ink);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .55s var(--ease);
}
.category-card:hover{background:var(--paper-2);}
.category-card:hover::after{transform:scaleX(1);}

.card-icon{
  width:52px;
  height:52px;
  display:grid;
  place-items:center;
  border:1px solid var(--ink);
  background:#fff;
  color:var(--ink);
  font-family:var(--serif);
  font-size:19px;
  line-height:1;
  transition:background .45s var(--ease),color .45s var(--ease),transform .45s var(--ease);
}
.category-card:hover .card-icon{
  background:var(--ink);
  color:#fff;
  transform:rotate(-4deg);
}

.category-card h3{
  font-family:var(--serif);
  font-size:22px;
  font-weight:600;
  letter-spacing:0;
  color:var(--ink);
  margin:0;
}

.category-card p{
  font-size:15px;
  line-height:1.85;
  color:var(--gray-1);
  margin:0;
}

.card-link{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin-top:auto;
  padding-top:14px;
  font-size:13px;
  letter-spacing:.2em;
  color:var(--ink);
  transition:gap .4s var(--ease),color .4s var(--ease);
}
.card-link::after{
  content:"→";
  font-size:15px;
  letter-spacing:0;
  transition:transform .4s var(--ease);
}
.card-link:hover{gap:16px;}
.card-link:hover::after{transform:translateX(3px);}

/* ============ 特性区块 ============ */
.feature-block{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:88px;
  align-items:center;
  padding:0 0 0;
  margin-top:70px;
}
.feature-block:first-of-type{margin-top:0;}

.feature-image{
  position:relative;
  overflow:hidden;
  background:var(--paper-2);
  border:1px solid var(--line);
  aspect-ratio:5/4;
}
.feature-image img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:grayscale(1) contrast(1.06);
  transition:transform 1.1s var(--ease),filter .8s var(--ease);
}
.feature-image:hover img{
  transform:scale(1.04);
  filter:grayscale(.1) contrast(1.04);
}

.feature-text h3{
  font-family:var(--serif);
  font-size:clamp(24px,2.6vw,34px);
  font-weight:600;
  line-height:1.28;
  color:var(--ink);
  margin:0 0 20px;
}

.feature-text p{
  font-size:16px;
  line-height:1.95;
  color:var(--gray-1);
  margin:0 0 26px;
}

.feature-list{
  display:grid;
  gap:14px;
  margin:0;
}
.feature-list li{
  position:relative;
  padding-left:34px;
  font-size:15px;
  line-height:1.8;
  color:var(--ink-soft);
}
.feature-list li::before{
  content:"—";
  position:absolute;
  left:0;
  top:0;
  color:var(--gray-2);
  font-size:15px;
  transition:color .35s var(--ease);
}
.feature-list li:hover::before{color:var(--ink);}

/* ============ 数据条 ============ */
.stats-bar{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  margin-top:0;
}

.stat-item{
  padding:56px 34px;
  text-align:left;
  border-right:1px solid var(--line);
  transition:background .45s var(--ease);
}
.stat-item:last-child{border-right:0;}
.stat-item:hover{background:var(--paper-2);}

.stat-number{
  display:block;
  font-family:var(--serif);
  font-size:clamp(34px,4.2vw,58px);
  font-weight:600;
  line-height:1;
  letter-spacing:-.03em;
  color:var(--ink);
  margin-bottom:14px;
}

.stat-label{
  display:block;
  font-size:11px;
  font-weight:600;
  letter-spacing:.28em;
  color:var(--gray-2);
  line-height:1.6;
}

/* ============ 内容墙 ============ */
.content-wall{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:44px 34px;
  margin-top:64px;
}

.content-wall-item{
  display:flex;
  flex-direction:column;
  background:var(--paper);
  border:1px solid var(--line);
  overflow:hidden;
  transition:border-color .45s var(--ease),transform .55s var(--ease),box-shadow .55s var(--ease);
}
.content-wall-item:hover{
  border-color:var(--ink);
  transform:translateY(-4px);
  box-shadow:var(--shadow);
}

.content-wall-item img{
  width:100%;
  aspect-ratio:16/11;
  object-fit:cover;
  filter:grayscale(1) contrast(1.05);
  transition:transform 1s var(--ease),filter .7s var(--ease);
}
.content-wall-item:hover img{
  transform:scale(1.04);
  filter:grayscale(0) contrast(1.02);
}

.content-wall-body{
  padding:28px 28px 32px;
  display:flex;
  flex-direction:column;
  gap:12px;
  flex:1;
  border-top:1px solid var(--line-soft);
}

.content-wall-body h4,
.content-wall-body h3{
  font-family:var(--serif);
  font-size:19px;
  font-weight:600;
  line-height:1.5;
  color:var(--ink);
  margin:0;
}

.content-wall-body p{
  font-size:14px;
  line-height:1.85;
  color:var(--gray-1);
  margin:0;
}

.content-wall-body span,
.content-wall-body time{
  font-size:11px;
  letter-spacing:.24em;
  color:var(--gray-2);
  margin-top:auto;
  padding-top:8px;
}

/* ============ 问答 ============ */
.faq-list{
  margin-top:58px;
  border-top:1px solid var(--line);
}

.faq-item{
  border-bottom:1px solid var(--line);
  padding:32px 0;
  transition:padding .4s var(--ease);
}

.faq-question{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:28px;
  font-family:var(--serif);
  font-size:clamp(17px,1.9vw,21px);
  font-weight:600;
  line-height:1.6;
  color:var(--ink);
  cursor:pointer;
  transition:color .35s var(--ease);
}
.faq-question::after{
  content:"+";
  flex:0 0 auto;
  font-family:var(--sans);
  font-size:20px;
  font-weight:400;
  color:var(--gray-2);
  line-height:1;
  margin-top:6px;
  transition:transform .45s var(--ease),color .35s var(--ease);
}
.faq-item:hover .faq-question{color:var(--ink-soft);}
.faq-item:hover .faq-question::after{color:var(--ink);transform:rotate(90deg);}
.faq-item.active .faq-question::after{content:"−";transform:none;color:var(--ink);}

.faq-answer{
  max-width:78ch;
  margin-top:16px;
  font-size:15px;
  line-height:1.95;
  color:var(--gray-1);
}

/* ============ 横幅 ============ */
.cta-banner{
  position:relative;
  background:var(--ink);
  color:#fff;
  padding:104px 32px;
  text-align:center;
  overflow:hidden;
}
.cta-banner::before,
.cta-banner::after{
  content:"";
  position:absolute;
  top:50%;
  width:1px;
  height:62%;
  background:rgba(255,255,255,.14);
  transform:translateY(-50%);
}
.cta-banner::before{left:7%;}
.cta-banner::after{right:7%;}

.cta-banner h2,
.cta-banner .section-title{
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(28px,3.6vw,46px);
  line-height:1.24;
  letter-spacing:-.01em;
  color:#fff;
  margin:0 auto 20px;
  max-width:20ch;
}

.cta-banner p,
.cta-banner .section-desc{
  font-size:16px;
  line-height:1.9;
  color:rgba(255,255,255,.66);
  max-width:54ch;
  margin:0 auto 42px;
}

.cta-banner .btn{
  margin:0 8px 12px;
}
.cta-banner .btn-primary{
  background:#fff;
  color:var(--ink);
  border-color:#fff;
}
.cta-banner .btn-primary:hover{
  background:transparent;
  color:#fff;
}
.cta-banner .btn-outline{
  background:transparent;
  color:#fff;
  border-color:rgba(255,255,255,.5);
}
.cta-banner .btn-outline:hover{
  background:#fff;
  color:var(--ink);
  border-color:#fff;
}

/* ============ 页脚 ============ */
.site-footer{
  background:var(--paper-2);
  border-top:1px solid var(--line);
  padding:88px 0 0;
  color:var(--gray-1);
}

.footer-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:56px;
  padding-bottom:70px;
}

.footer-brand .logo{
  margin-bottom:24px;
  font-size:20px;
}

.footer-brand p{
  font-size:14px;
  line-height:1.95;
  color:var(--gray-1);
  max-width:36ch;
  margin-bottom:0;
}

.footer-col h4{
  font-size:11px;
  font-weight:700;
  letter-spacing:.28em;
  color:var(--ink);
  margin:0 0 22px;
}

.footer-col a{
  display:block;
  padding:7px 0;
  font-size:14px;
  line-height:1.7;
  color:var(--gray-1);
  transition:color .35s var(--ease),padding-left .35s var(--ease);
}
.footer-col a:hover{
  color:var(--ink);
  padding-left:6px;
}

.footer-bottom{
  border-top:1px solid var(--line);
  padding:28px 0;
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:14px;
  font-size:12px;
  letter-spacing:.08em;
  color:var(--gray-2);
}
.footer-bottom a{color:var(--gray-2);transition:color .35s var(--ease);}
.footer-bottom a:hover{color:var(--ink);}

/* ============ 文字工具 ============ */
.text-accent{
  font-family:var(--serif);
  color:var(--ink);
  font-weight:600;
  letter-spacing:.01em;
}

.text-center{text-align:center;}

.text-center .section-title,
.text-center .section-desc,
.text-center .section-label{
  margin-left:auto;
  margin-right:auto;
}
.text-center .section-label{justify-content:center;}

.seo-description{
  font-size:13px;
  line-height:2;
  color:var(--gray-2);
  letter-spacing:.02em;
  max-width:96ch;
  margin-top:56px;
  padding-top:32px;
  border-top:1px solid var(--line-soft);
}

.mt-0{margin-top:0 !important;}
.mb-0{margin-bottom:0 !important;}

/* ============ 响应式 ============ */
@media (max-width:1080px){
  .section{padding:96px 0;}
  .hero{padding:104px 0 100px;}
  .hero .container{gap:52px;}
  .feature-block{gap:56px;}
  .footer-grid{grid-template-columns:1.6fr 1fr 1fr;gap:44px;}
  .footer-brand{grid-column:1 / -1;}
}

@media (max-width:900px){
  .main-nav{
    display:none;
    position:absolute;
    top:100%;
    left:0;
    right:0;
    flex-direction:column;
    align-items:flex-start;
    gap:0;
    padding:12px 32px 26px;
    background:#fff;
    border-bottom:1px solid var(--line);
    box-shadow:0 30px 50px -40px rgba(0,0,0,.4);
  }
  .site-header.nav-open .main-nav{display:flex;}
  .main-nav a{
    width:100%;
    padding:16px 0;
    border-bottom:1px solid var(--line-soft);
    font-size:15px;
  }
  .main-nav a::after{display:none;}
  .nav-cta{
    display:none;
  }
  .site-header.nav-open .main-nav .nav-cta{
    display:inline-flex;
    margin:20px 0 0;
  }
  .menu-toggle{display:block;margin-left:auto;}

  .hero .container{
    grid-template-columns:1fr;
    gap:48px;
  }
  .hero::before{display:none;}
  .hero-content{max-width:none;}
  .hero-image{aspect-ratio:16/10;}

  .cards-grid{grid-template-columns:1fr 1fr;}
  .content-wall{grid-template-columns:1fr 1fr;gap:32px 24px;}

  .feature-block{
    grid-template-columns:1fr;
    gap:36px;
  }
  .feature-image{aspect-ratio:16/10;}

  .stats-bar{grid-template-columns:1fr 1fr;}
  .stat-item{padding:42px 26px;}
  .stat-item:nth-child(2n){border-right:0;}
  .stat-item:nth-child(-n+2){border-bottom:1px solid var(--line);}
}

@media (max-width:640px){
  body{font-size:15px;}
  .container{padding:0 22px;}
  .header-inner{padding:0 22px;min-height:72px;gap:16px;}
  .logo{font-size:18px;gap:10px;}
  .logo-icon{width:30px;height:30px;font-size:14px;}
  .main-nav{padding:10px 22px 22px;}

  .section{padding:72px 0;}
  .section-label{margin-bottom:20px;letter-spacing:.26em;}
  .section-title{margin-bottom:18px;max-width:none;}
  .section-desc{font-size:15px;}

  .hero{padding:74px 0 72px;}
  .hero-eyebrow{margin-bottom:24px;letter-spacing:.28em;}
  .hero-content p{font-size:16px;}
  .hero-buttons{gap:12px;margin-top:34px;}
  .hero-buttons .btn{width:100%;}
  .hero-image{aspect-ratio:4/3;}

  .btn{padding:15px 28px;font-size:13px;}

  .cards-grid{grid-template-columns:1fr;margin-top:44px;}
  .category-card{padding:38px 26px 34px;}

  .content-wall{grid-template-columns:1fr;gap:26px;margin-top:44px;}
  .content-wall-body{padding:24px 22px 26px;}

  .feature-block{margin-top:48px;}
  .faq-item{padding:26px 0;}
  .faq-question{gap:18px;}

  .stats-bar{grid-template-columns:1fr;}
  .stat-item{padding:34px 22px;border-right:0;border-bottom:1px solid var(--line);}
  .stat-item:last-child{border-bottom:0;}

  .cta-banner{padding:72px 22px;}
  .cta-banner::before,.cta-banner::after{display:none;}
  .cta-banner .btn{width:100%;margin:0 0 12px;}

  .site-footer{padding:64px 0 0;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px 24px;padding-bottom:48px;}
  .footer-brand{grid-column:1 / -1;}
  .footer-bottom{padding:22px 0;}
}

@media (max-width:400px){
  .footer-grid{grid-template-columns:1fr;}
  .content-wall-body h4{font-size:17px;}
}```