/* ============================================================
   问鼎大舞台 · 极简黑白设计系统
   纯黑白灰 / 高对比排版 / 摄影感 / 经典永恒
   ============================================================ */

:root{
  --ink:#0a0a0a;
  --ink-soft:#2b2b2b;
  --paper:#ffffff;
  --haze:#f7f7f7;
  --haze-2:#f1f1f1;
  --line:#e4e4e4;
  --line-soft:#eeeeee;
  --gray:#8c8c8c;
  --gray-deep:#5c5c5c;
  --serif:"Songti SC","Noto Serif SC","Source Han Serif SC",Georgia,"Times New Roman",serif;
  --sans:"Helvetica Neue",Helvetica,Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --ease:cubic-bezier(.19,1,.22,1);
  --ease-out:cubic-bezier(.16,.84,.44,1);
}

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

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:96px;
}

body{
  margin:0;
  padding:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
}

img{max-width:100%;display:block;height:auto;}

a{color:inherit;text-decoration:none;}

button{font-family:inherit;}

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

:focus-visible{outline:1px solid var(--ink);outline-offset:3px;}

::-webkit-scrollbar{width:10px;height:10px;}
::-webkit-scrollbar-track{background:var(--haze);}
::-webkit-scrollbar-thumb{background:#cfcfcf;border:3px solid var(--haze);}
::-webkit-scrollbar-thumb:hover{background:var(--ink);}

/* ============================================================
   布局基础
   ============================================================ */

.container{
  width:100%;
  max-width:1240px;
  margin:0 auto;
  padding-left:clamp(20px,4vw,40px);
  padding-right:clamp(20px,4vw,40px);
}

.section{
  position:relative;
  padding:clamp(64px,9vw,128px) 0;
}

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

.section-label{
  display:inline-flex;
  align-items:center;
  gap:14px;
  font-family:var(--sans);
  font-size:11px;
  font-weight:600;
  letter-spacing:.32em;
  color:var(--gray);
  text-transform:uppercase;
  margin:0;
}

.section-label::before{
  content:"";
  width:38px;
  height:1px;
  background:var(--ink);
  flex:none;
}

.section-title{
  font-family:var(--serif);
  font-size:clamp(27px,4vw,46px);
  font-weight:600;
  line-height:1.26;
  letter-spacing:.005em;
  margin:20px 0 0;
  color:var(--ink);
  max-width:18em;
}

.section-desc{
  margin:20px 0 0;
  max-width:620px;
  font-size:clamp(14.5px,1.1vw,16px);
  line-height:1.9;
  color:var(--gray-deep);
  font-weight:400;
}

/* ============================================================
   文字工具
   ============================================================ */

.text-accent{
  font-family:var(--serif);
  font-weight:600;
  font-style:normal;
  color:var(--ink);
  border-bottom:2px solid var(--ink);
  padding-bottom:1px;
}

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

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

.seo-description{
  font-size:13px;
  line-height:2;
  color:var(--gray);
  max-width:760px;
  letter-spacing:.02em;
}

/* ============================================================
   站点导航
   ============================================================ */

.site-header{
  position:sticky;
  top:0;
  z-index:120;
  background:rgba(255,255,255,.94);
  -webkit-backdrop-filter:saturate(140%) blur(14px);
  backdrop-filter:saturate(140%) blur(14px);
  border-bottom:1px solid var(--line);
}

.header-inner{
  width:100%;
  max-width:1240px;
  margin:0 auto;
  padding-left:clamp(20px,4vw,40px);
  padding-right:clamp(20px,4vw,40px);
  height:78px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:28px;
  position:relative;
}

.logo{
  display:inline-flex;
  align-items:center;
  gap:13px;
  font-size:17px;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--ink);
  white-space:nowrap;
  transition:opacity .35s var(--ease);
}

.logo:hover{opacity:.62;}

.logo-icon{
  width:36px;
  height:36px;
  flex:none;
  display:grid;
  place-items:center;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--serif);
  font-size:16px;
  font-weight:600;
  letter-spacing:0;
  line-height:1;
  transition:transform .5s var(--ease);
}

.logo:hover .logo-icon{transform:rotate(-6deg);}

.main-nav{
  display:flex;
  align-items:center;
  gap:clamp(20px,2.4vw,38px);
  margin-left:auto;
}

.main-nav a{
  position:relative;
  font-size:14px;
  font-weight:500;
  letter-spacing:.10em;
  color:var(--ink-soft);
  padding:6px 0;
  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:right center;
  transition:transform .5s var(--ease);
}

.main-nav a:hover{color:var(--ink);}
.main-nav a:hover::after{transform:scaleX(1);transform-origin:left center;}

.nav-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:11px 24px;
  font-size:13px;
  font-weight:600;
  letter-spacing:.14em;
  color:var(--paper);
  background:var(--ink);
  border:1px solid var(--ink);
  transition:background .4s var(--ease),color .4s var(--ease);
  white-space:nowrap;
}

.nav-cta:hover{background:var(--paper);color:var(--ink);}

.menu-toggle{
  display:none;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
  width:44px;
  height:44px;
  padding:0;
  background:var(--paper);
  border:1px solid var(--line);
  cursor:pointer;
  transition:border-color .35s var(--ease);
}

.menu-toggle span{
  display:block;
  width:19px;
  height:1px;
  background:var(--ink);
  transition:transform .4s var(--ease),opacity .3s;
}

.menu-toggle:hover{border-color:var(--ink);}

/* ============================================================
   首屏
   ============================================================ */

.hero{
  position:relative;
  padding:clamp(56px,8vw,116px) 0 clamp(56px,7vw,104px);
  border-bottom:1px solid var(--line);
  background:
    linear-gradient(180deg,#ffffff 0%,#fdfdfd 100%);
  overflow:hidden;
}

.hero::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(0,0,0,.035) 1px,transparent 1px);
  background-size:calc(100% / 6) 100%;
  mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 78%);
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 78%);
}

.hero .container{position:relative;z-index:2;}

.hero-content{
  display:grid;
  grid-template-columns:minmax(0,1.04fr) minmax(0,.86fr);
  column-gap:clamp(32px,5.5vw,84px);
  row-gap:0;
  align-items:center;
}

.hero-content > *:not(.hero-image){grid-column:1;}

.hero-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:14px;
  font-size:11px;
  font-weight:600;
  letter-spacing:.34em;
  color:var(--gray);
  text-transform:uppercase;
  margin:0 0 26px;
}

.hero-eyebrow::before{
  content:"";
  width:46px;
  height:1px;
  background:var(--ink);
}

.hero h1,
.hero-title{
  font-family:var(--serif);
  font-size:clamp(34px,5.4vw,68px);
  font-weight:600;
  line-height:1.16;
  letter-spacing:-.005em;
  margin:0 0 26px;
  color:var(--ink);
}

.hero p{
  margin:0;
  max-width:36em;
  font-size:clamp(15px,1.15vw,17px);
  line-height:1.95;
  color:var(--gray-deep);
}

.hero-buttons{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:16px;
  margin-top:40px;
}

.hero-image{
  grid-column:2;
  grid-row:1 / span 12;
  position:relative;
  background:var(--haze-2);
  border:1px solid var(--line);
  aspect-ratio:4 / 5;
  overflow:hidden;
  filter:contrast(1.02);
}

.hero-image img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:grayscale(100%) contrast(1.06);
  transition:transform 1.2s var(--ease),filter .8s var(--ease);
}

.hero-image:hover img{transform:scale(1.035);filter:grayscale(100%) contrast(1.12);}

.hero-image::after{
  content:"";
  position:absolute;
  inset:16px -16px -16px 16px;
  border:1px solid var(--ink);
  pointer-events:none;
  z-index:-1;
}

/* ============================================================
   按钮
   ============================================================ */

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:16px 34px;
  font-family:var(--sans);
  font-size:13px;
  font-weight:600;
  letter-spacing:.16em;
  line-height:1;
  border:1px solid var(--ink);
  border-radius:0;
  background:transparent;
  color:var(--ink);
  cursor:pointer;
  text-decoration:none;
  transition:background .45s var(--ease),color .45s var(--ease),transform .45s var(--ease);
  -webkit-appearance:none;
  appearance:none;
}

.btn:hover{transform:translateY(-2px);}
.btn:active{transform:translateY(0);}

.btn-primary{
  background:var(--ink);
  color:var(--paper);
  border-color:var(--ink);
}

.btn-primary:hover{
  background:var(--paper);
  color:var(--ink);
}

.btn-outline{
  background:transparent;
  color:var(--ink);
  border-color:var(--ink);
}

.btn-outline:hover{
  background:var(--ink);
  color:var(--paper);
}

/* ============================================================
   卡片网格
   ============================================================ */

.cards-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(258px,1fr));
  gap:0;
  margin-top:clamp(40px,5vw,64px);
  border-top:1px solid var(--line);
  border-left:1px solid var(--line);
}

.category-card{
  position:relative;
  background:var(--paper);
  border-right:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:clamp(30px,3.4vw,46px) clamp(24px,2.8vw,36px);
  color:var(--ink);
  transition:background .5s var(--ease),color .5s var(--ease);
  overflow:hidden;
}

.category-card h3{
  font-family:var(--serif);
  font-size:21px;
  font-weight:600;
  line-height:1.4;
  margin:0 0 12px;
  letter-spacing:.01em;
  transition:color .5s var(--ease);
}

.category-card p{
  margin:0;
  font-size:14.5px;
  line-height:1.85;
  color:var(--gray-deep);
  transition:color .5s var(--ease);
}

.category-card:hover{
  background:var(--ink);
  color:var(--paper);
}

.category-card:hover p{color:#b9b9b9;}
.category-card:hover .card-icon{border-color:var(--paper);color:var(--paper);}
.category-card:hover .card-link{color:var(--paper);}

.card-icon{
  width:54px;
  height:54px;
  display:grid;
  place-items:center;
  margin-bottom:28px;
  border:1px solid var(--ink);
  font-family:var(--serif);
  font-size:19px;
  font-weight:600;
  line-height:1;
  color:var(--ink);
  transition:border-color .5s var(--ease),color .5s var(--ease),transform .5s var(--ease);
}

.category-card:hover .card-icon{transform:rotate(-4deg);}

.card-link{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin-top:28px;
  font-size:12px;
  font-weight:600;
  letter-spacing:.18em;
  color:var(--ink);
  transition:color .5s var(--ease);
}

.card-link::after{
  content:"→";
  font-size:14px;
  letter-spacing:0;
  transition:transform .5s var(--ease);
}

.card-link:hover::after,
.category-card:hover .card-link::after{transform:translateX(6px);}

/* ============================================================
   特性区块
   ============================================================ */

.feature-block{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:clamp(32px,6vw,92px);
  align-items:center;
}

.feature-block + .feature-block{
  margin-top:clamp(64px,9vw,124px);
}

.feature-image{
  position:relative;
  background:var(--haze-2);
  border:1px solid var(--line);
  aspect-ratio:5 / 4;
  overflow:hidden;
}

.feature-image img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:grayscale(100%) contrast(1.06);
  transition:transform 1.1s var(--ease);
}

.feature-image:hover img{transform:scale(1.04);}

.feature-image::before{
  content:"";
  position:absolute;
  top:14px;
  left:14px;
  width:26px;
  height:26px;
  border-top:1px solid var(--ink);
  border-left:1px solid var(--ink);
  z-index:2;
  pointer-events:none;
}

.feature-block:nth-child(even) .feature-image{order:2;}

.feature-text h2,
.feature-text h3{
  font-family:var(--serif);
  font-size:clamp(24px,3vw,38px);
  font-weight:600;
  line-height:1.3;
  margin:0 0 20px;
  letter-spacing:.005em;
}

.feature-text > p{
  margin:0 0 8px;
  font-size:15.5px;
  line-height:1.95;
  color:var(--gray-deep);
}

.feature-list{
  list-style:none;
  margin:30px 0 0;
  padding:0;
  border-top:1px solid var(--line);
}

.feature-list li{
  position:relative;
  padding:18px 0 18px 30px;
  border-bottom:1px solid var(--line);
  font-size:14.5px;
  line-height:1.7;
  color:var(--ink-soft);
  transition:padding-left .45s var(--ease),color .35s var(--ease);
}

.feature-list li::before{
  content:"";
  position:absolute;
  left:0;
  top:26px;
  width:10px;
  height:10px;
  background:var(--ink);
  transition:transform .45s var(--ease);
}

.feature-list li:hover{padding-left:38px;color:var(--ink);}
.feature-list li:hover::before{transform:rotate(45deg);}

/* ============================================================
   数据条
   ============================================================ */

.stats-bar{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--ink);
  border-bottom:1px solid var(--ink);
  margin:clamp(40px,5vw,64px) 0 0;
}

.stat-item{
  padding:clamp(30px,4vw,52px) clamp(12px,2vw,26px);
  text-align:center;
  border-right:1px solid var(--line);
  transition:background .45s var(--ease);
}

.stat-item:last-child{border-right:0;}
.stat-item:hover{background:var(--haze);}

.stat-number{
  display:block;
  font-family:var(--serif);
  font-size:clamp(32px,4.6vw,58px);
  font-weight:600;
  line-height:1;
  letter-spacing:-.02em;
  color:var(--ink);
  font-variant-numeric:tabular-nums;
}

.stat-label{
  display:block;
  margin-top:14px;
  font-size:11.5px;
  font-weight:600;
  letter-spacing:.24em;
  color:var(--gray);
}

/* ============================================================
   内容墙
   ============================================================ */

.content-wall{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,2.6vw,36px);
  margin-top:clamp(40px,5vw,64px);
}

.content-wall-item{
  position:relative;
  display:flex;
  flex-direction:column;
  background:var(--paper);
  border:1px solid var(--line);
  overflow:hidden;
  transition:border-color .5s var(--ease),transform .6s var(--ease);
}

.content-wall-item:hover{
  border-color:var(--ink);
  transform:translateY(-4px);
}

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

.content-wall-item:hover img{
  filter:grayscale(100%) contrast(1.16);
  transform:scale(1.03);
}

.content-wall-body{
  padding:26px clamp(20px,2.2vw,30px) 32px;
  display:flex;
  flex-direction:column;
  flex:1;
}

.content-wall-body h3{
  font-family:var(--serif);
  font-size:19px;
  font-weight:600;
  line-height:1.45;
  margin:0 0 10px;
}

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

.content-wall-body .card-link{margin-top:auto;padding-top:24px;}

/* ============================================================
   问答
   ============================================================ */

.faq-list{
  margin-top:clamp(40px,5vw,60px);
  border-top:1px solid var(--ink);
  max-width:960px;
}

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

.faq-question{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  padding:26px 4px;
  margin:0;
  font-size:clamp(15px,1.25vw,17px);
  font-weight:600;
  letter-spacing:.02em;
  color:var(--ink);
  cursor:pointer;
  list-style:none;
  transition:padding .45s var(--ease),color .35s var(--ease);
}

.faq-question::-webkit-details-marker{display:none;}

.faq-question::after{
  content:"+";
  flex:none;
  width:34px;
  height:34px;
  display:grid;
  place-items:center;
  border:1px solid var(--line);
  font-family:var(--sans);
  font-size:16px;
  font-weight:400;
  line-height:1;
  color:var(--ink);
  transition:transform .5s var(--ease),border-color .4s var(--ease),background .4s var(--ease);
}

.faq-item:hover .faq-question{padding-left:14px;}
.faq-item:hover .faq-question::after{border-color:var(--ink);}

.faq-item[open] .faq-question::after{
  content:"−";
  transform:rotate(180deg);
  background:var(--ink);
  color:var(--paper);
  border-color:var(--ink);
}

.faq-answer{
  padding:0 4px 30px;
  margin:0;
  max-width:800px;
  font-size:14.5px;
  line-height:2;
  color:var(--gray-deep);
}

/* ============================================================
   行动横幅
   ============================================================ */

.cta-banner{
  position:relative;
  background:var(--ink);
  color:var(--paper);
  padding:clamp(56px,8vw,108px) clamp(24px,5vw,72px);
  text-align:center;
  overflow:hidden;
}

.cta-banner::before,
.cta-banner::after{
  content:"";
  position:absolute;
  width:180px;
  height:180px;
  border:1px solid rgba(255,255,255,.16);
  pointer-events:none;
}

.cta-banner::before{top:-90px;left:-60px;transform:rotate(45deg);}
.cta-banner::after{bottom:-90px;right:-60px;transform:rotate(45deg);}

.cta-banner h2{
  position:relative;
  z-index:2;
  font-family:var(--serif);
  font-size:clamp(26px,4.2vw,48px);
  font-weight:600;
  line-height:1.28;
  margin:0 auto;
  max-width:16em;
  letter-spacing:.005em;
}

.cta-banner p{
  position:relative;
  z-index:2;
  margin:22px auto 0;
  max-width:640px;
  font-size:15px;
  line-height:1.9;
  color:rgba(255,255,255,.68);
}

.cta-banner .btn{
  position:relative;
  z-index:2;
  margin-top:38px;
  background:var(--paper);
  color:var(--ink);
  border-color:var(--paper);
}

.cta-banner .btn:hover{
  background:transparent;
  color:var(--paper);
  border-color:var(--paper);
}

.cta-banner .btn-outline{
  background:transparent;
  color:var(--paper);
  border-color:rgba(255,255,255,.5);
}

.cta-banner .btn-outline:hover{
  background:var(--paper);
  color:var(--ink);
  border-color:var(--paper);
}

/* ============================================================
   页脚
   ============================================================ */

.site-footer{
  background:var(--haze);
  border-top:1px solid var(--line);
  padding:clamp(52px,7vw,88px) 0 0;
  color:var(--ink-soft);
}

.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.15fr;
  gap:clamp(28px,4vw,56px);
  padding-bottom:clamp(40px,5vw,64px);
}

.footer-brand .logo{
  font-size:16px;
  margin-bottom:20px;
}

.footer-brand p{
  margin:0 0 6px;
  max-width:28em;
  font-size:13.5px;
  line-height:1.95;
  color:var(--gray-deep);
}

.footer-col h4{
  margin:0 0 20px;
  font-family:var(--sans);
  font-size:11px;
  font-weight:600;
  letter-spacing:.28em;
  color:var(--gray);
}

.footer-col ul{
  list-style:none;
  margin:0;
  padding:0;
}

.footer-col li{margin-bottom:12px;}
.footer-col li:last-child{margin-bottom:0;}

.footer-col a{
  position:relative;
  display:inline-block;
  font-size:14px;
  color:var(--ink-soft);
  transition:color .35s var(--ease),transform .35s var(--ease);
}

.footer-col a:hover{
  color:var(--ink);
  transform:translateX(4px);
}

.footer-col p{
  margin:0 0 12px;
  font-size:14px;
  line-height:1.8;
  color:var(--ink-soft);
}

.footer-bottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:16px;
  padding:26px 0 32px;
  border-top:1px solid var(--line);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--gray);
}

.footer-bottom p{margin:0;}
.footer-bottom a{color:var(--gray);transition:color .3s;}
.footer-bottom a:hover{color:var(--ink);}

/* ============================================================
   响应式 · 平板
   ============================================================ */

@media (max-width:1024px){
  .header-inner{height:72px;}
  .main-nav{gap:20px;}
  .main-nav a{font-size:13px;letter-spacing:.06em;}

  .hero-content{
    grid-template-columns:minmax(0,1fr);
    row-gap:clamp(34px,5vw,52px);
  }

  .hero-content > *:not(.hero-image){grid-column:1;}

  .hero-image{
    grid-column:1;
    grid-row:auto;
    aspect-ratio:16 / 11;
    max-width:100%;
  }

  .hero-image::after{display:none;}

  .content-wall{grid-template-columns:repeat(2,minmax(0,1fr));}

  .footer-grid{grid-template-columns:1fr 1fr;}
}

/* ============================================================
   响应式 · 手机
   ============================================================ */

@media (max-width:900px){
  .menu-toggle{display:flex;}

  .main-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin-left:0;
    padding:8px clamp(20px,4vw,40px) 26px;
    background:var(--paper);
    border-bottom:1px solid var(--line);
    box-shadow:0 24px 40px -28px rgba(0,0,0,.35);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    pointer-events:none;
    transition:opacity .4s var(--ease),transform .4s var(--ease),visibility .4s;
    max-height:calc(100vh - 78px);
    overflow-y:auto;
  }

  .site-header.nav-open .main-nav,
  .site-header.is-open .main-nav,
  .main-nav.is-open,
  .main-nav.open{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
    pointer-events:auto;
  }

  .main-nav a{
    padding:16px 0;
    font-size:15px;
    letter-spacing:.08em;
    border-bottom:1px solid var(--line-soft);
  }

  .main-nav a::after{display:none;}

  .nav-cta{
    margin-top:20px;
    padding:15px 24px;
    text-align:center;
  }

  .site-header.nav-open .menu-toggle span:nth-child(1),
  .main-nav.is-open ~ .menu-toggle span:nth-child(1){
    transform:translateY(6px) rotate(45deg);
  }

  .feature-block{
    grid-template-columns:1fr;
    gap:clamp(26px,5vw,40px);
  }

  .feature-block:nth-child(even) .feature-image{order:0;}

  .stats-bar{grid-template-columns:repeat(2,1fr);}

  .stat-item:nth-child(2){border-right:0;}
  .stat-item:nth-child(1),
  .stat-item:nth-child(2){border-bottom:1px solid var(--line);}

  .content-wall{grid-template-columns:1fr;}

  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .footer-brand{grid-column:1 / -1;}

  .footer-bottom{flex-direction:column;align-items:flex-start;gap:10px;}

  .hero::before{background-size:calc(100% / 3) 100%;}
}

@media (max-width:560px){
  body{font-size:15px;line-height:1.72;}

  .hero-buttons{gap:12px;}
  .hero-buttons .btn{flex:1 1 auto;padding:15px 20px;letter-spacing:.1em;}

  .cards-grid{grid-template-columns:1fr;}

  .stat-item{padding:26px 10px;}
  .stat-label{letter-spacing:.16em;font-size:11px;}

  .faq-question{padding:22px 2px;gap:16px;}
  .faq-question::after{width:30px;height:30px;font-size:15px;}

  .cta-banner::before,.cta-banner::after{width:120px;height:120px;}

  .footer-grid{grid-template-columns:1fr;}
}

/* ============================================================
   动效偏好
   ============================================================ */

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}