:root{
  --paper:#FBF6EE;
  --paper-2:#F2EADD;
  --paper-3:#E9DFCE;
  --ink:#22303F;
  --ink-soft:#5D6B78;
  --coral:#FF5C39;
  --coral-soft:#FFE3DA;
  --teal:#0E7C7B;
  --teal-soft:#D6EFEB;
  --lime:#D9F24E;
  --line:#DCCFBB;
  --r:18px;
  --r-sm:12px;
  --shadow:6px 6px 0 var(--ink);
  --shadow-sm:4px 4px 0 var(--ink);
  --ease:cubic-bezier(.22,.9,.28,1);
}

/* 基础重置 */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x:hidden;
  background:var(--paper);
  color:var(--ink);
  line-height:1.7;
  padding-top:68px;
  -webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(circle at 12% 8%, rgba(255,92,57,.07), transparent 42%),
    radial-gradient(circle at 92% 4%, rgba(14,124,123,.08), transparent 38%);
  background-attachment:fixed;
}
::selection{background:var(--lime);color:var(--ink);}
html{scroll-behavior:smooth;scroll-padding-top:88px;}
img{max-width:100%;display:block;}

/* 核心布局 — 必须居中 */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }
.section { padding:80px 0; }
.section:nth-child(even) { background:var(--paper-2); }
.section:nth-child(even){border-top:1px solid var(--line);border-bottom:1px solid var(--line);}

/* 导航 — 固定顶部 */
.site-header {
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  background:rgba(251,246,238,.92);
  backdrop-filter:blur(14px) saturate(160%);
  border-bottom:2px solid var(--ink);
}
.header-inner { display:flex; align-items:center; justify-content:space-between; height:68px; max-width:1200px; margin:0 auto; padding:0 24px; }
.logo {
  display:flex; align-items:center; gap:10px;
  font-weight:900; font-size:1.22rem; text-decoration:none; color:var(--ink);
  letter-spacing:-.5px;
}
.logo-icon {
  width:36px; height:36px; border-radius:10px;
  display:flex; align-items:center; justify-content:center;
  font-size:1rem; font-weight:900; color:#fff;
  background:linear-gradient(135deg,var(--coral),#FF9A3C 70%,var(--lime));
  border:2px solid var(--ink);
  box-shadow:3px 3px 0 var(--ink);
  transform:rotate(-6deg);
  transition:transform .35s var(--ease);
}
.logo:hover .logo-icon{transform:rotate(6deg) scale(1.05);}
.main-nav { display:flex; align-items:center; gap:24px; list-style:none; }
.main-nav a {
  text-decoration:none; font-size:.9rem; font-weight:600; color:var(--ink);
  transition:.2s var(--ease); position:relative; padding:4px 0;
}
.main-nav a::after{
  content:''; position:absolute; left:0; bottom:-2px; height:3px; width:0;
  background:var(--coral); border-radius:2px; transition:width .3s var(--ease);
}
.main-nav a:hover{color:var(--coral);}
.main-nav a:hover::after{width:100%;}
.nav-cta {
  padding:8px 20px; border-radius:10px; color:#fff!important; font-weight:700;
  background:var(--coral); border:2px solid var(--ink);
  box-shadow:3px 3px 0 var(--ink); transition:.2s var(--ease);
}
.nav-cta::after{display:none;}
.nav-cta:hover{transform:translate(2px,2px); box-shadow:1px 1px 0 var(--ink); background:#FF7A54;}
.menu-toggle { display:none; align-items:center; justify-content:center; width:42px; height:42px; border-radius:10px; border:2px solid var(--ink); background:#fff; box-shadow:3px 3px 0 var(--ink); cursor:pointer; font-size:1.1rem; font-weight:900; color:var(--ink);}

/* 首页Hero */
.hero {
  min-height:70vh; display:flex; align-items:center;
  position:relative; overflow:hidden; padding:64px 0 72px;
}
.hero::before{
  content:''; position:absolute; inset:0; z-index:0;
  background-image:radial-gradient(circle, rgba(34,48,63,.16) 1px, transparent 1.4px);
  background-size:24px 24px;
  -webkit-mask-image:linear-gradient(115deg,#000 8%,transparent 62%);
  mask-image:linear-gradient(115deg,#000 8%,transparent 62%);
  opacity:.55; pointer-events:none;
}
.hero::after{
  content:'求真'; position:absolute; right:-2%; bottom:-14%; z-index:0;
  font-size:clamp(9rem,26vw,22rem); font-weight:900; line-height:.8;
  color:transparent; -webkit-text-stroke:2px rgba(14,124,123,.16);
  letter-spacing:-.05em; pointer-events:none; user-select:none;
}
.hero .container{position:relative; z-index:1;}
.hero-content { max-width:760px; }
.hero-eyebrow {
  display:inline-block; font-size:.8rem; font-weight:800; letter-spacing:3px;
  padding:6px 16px; border-radius:6px; margin-bottom:22px;
  background:var(--lime); color:var(--ink);
  border:2px solid var(--ink); box-shadow:3px 3px 0 var(--ink);
  transform:rotate(-1.5deg); text-transform:uppercase;
}
.hero h1 {
  font-size:clamp(2.3rem,5.6vw,4.2rem); line-height:1.06; margin-bottom:22px;
  font-weight:900; letter-spacing:-2px;
}
.hero h1 em{font-style:normal; color:var(--coral); text-decoration:underline; text-decoration-thickness:6px; text-decoration-color:var(--lime); text-underline-offset:6px;}
.hero p { font-size:1.1rem; color:var(--ink-soft); max-width:560px; margin-bottom:34px; }
.hero-buttons { display:flex; gap:14px; flex-wrap:wrap; }
.hero-image {
  border-radius:var(--r); overflow:hidden;
  border:2px solid var(--ink); box-shadow:10px 10px 0 var(--teal);
  background:#fff;
}
.hero-image img { width:100%; height:auto; }

/* 按钮 */
.btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:13px 30px; border-radius:var(--r-sm);
  font-weight:800; font-size:.95rem; cursor:pointer; border:none;
  text-decoration:none; transition:.2s var(--ease);
  border:2px solid var(--ink); letter-spacing:.4px;
}
.btn-primary { color:#fff; background:var(--coral); box-shadow:var(--shadow-sm); }
.btn-primary:hover{transform:translate(3px,3px); box-shadow:1px 1px 0 var(--ink); background:#FF7452;}
.btn-outline { background:#fff; color:var(--ink); border:2px solid var(--ink); box-shadow:var(--shadow-sm); }
.btn-outline:hover{transform:translate(3px,3px); box-shadow:1px 1px 0 var(--ink); background:var(--teal-soft);}

/* 标签/标题 */
.section-label {
  display:inline-flex; align-items:center; gap:9px;
  font-size:.78rem; font-weight:800; letter-spacing:3.5px; margin-bottom:14px;
  color:var(--teal); text-transform:uppercase;
}
.section-label::before{
  content:''; width:11px; height:11px; background:var(--coral);
  border:2px solid var(--ink); border-radius:2px;
  transform:rotate(45deg); flex:none;
}
.section-title {
  font-size:clamp(1.7rem,3.4vw,2.6rem); margin-bottom:16px;
  font-weight:900; letter-spacing:-1.2px; line-height:1.15;
}
.section-desc { max-width:600px; color:var(--ink-soft); margin-bottom:44px; font-size:1.02rem; }

/* 卡片网格 */
.cards-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(260px,1fr)); gap:26px; }
.category-card {
  border-radius:var(--r); padding:30px 28px; border:2px solid var(--ink);
  background:#fff; box-shadow:var(--shadow-sm);
  transition:transform .25s var(--ease), box-shadow .25s var(--ease);
  position:relative; overflow:hidden;
}
.category-card::before{
  content:''; position:absolute; top:0; left:0; width:100%; height:6px;
  background:var(--coral); transform:scaleX(0); transform-origin:left;
  transition:transform .35s var(--ease);
}
.category-card:hover { transform:translate(-3px,-3px); box-shadow:9px 9px 0 var(--ink); }
.category-card:hover::before{transform:scaleX(1);}
.category-card:nth-child(2n)::before{background:var(--teal);}
.category-card:nth-child(3n)::before{background:var(--lime);}
.category-card:nth-child(3n){box-shadow:4px 4px 0 var(--teal);}
.category-card h3{font-size:1.12rem; font-weight:800; margin-bottom:8px; letter-spacing:-.3px;}
.category-card p{font-size:.92rem; color:var(--ink-soft);}
.card-icon {
  width:52px; height:52px; border-radius:14px;
  display:flex; align-items:center; justify-content:center;
  margin-bottom:18px; font-size:1.35rem;
  background:var(--coral-soft); border:2px solid var(--ink); color:var(--ink);
}
.category-card:nth-child(2n) .card-icon{background:var(--teal-soft);}
.category-card:nth-child(3n) .card-icon{background:var(--lime);}
.card-link {
  font-weight:800; font-size:.85rem; text-decoration:none; color:var(--teal);
  display:inline-flex; align-items:center; gap:6px; margin-top:14px;
  border-bottom:2px solid transparent; transition:.2s var(--ease);
}
.card-link:hover{color:var(--coral); border-bottom-color:var(--coral);}

/* 特性块 */
.feature-block { display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:center; }
.feature-image {
  border-radius:var(--r); overflow:hidden;
  border:2px solid var(--ink); box-shadow:-10px 10px 0 var(--lime);
  background:#fff;
}
.feature-image img { width:100%; height:auto; }
.feature-text { }
.feature-text h2{font-size:clamp(1.6rem,3vw,2.3rem); font-weight:900; letter-spacing:-1px; margin-bottom:14px; line-height:1.2;}
.feature-text > p{color:var(--ink-soft); margin-bottom:20px;}
.feature-list { list-style:none; }
.feature-list li {
  padding:9px 0; display:flex; align-items:center; gap:12px;
  font-weight:600; border-bottom:1px dashed var(--line);
}
.feature-list li:last-child{border-bottom:none;}
.feature-list li::before {
  content:'✓'; font-weight:900;
  display:inline-flex; align-items:center; justify-content:center;
  width:24px; height:24px; flex:none; border-radius:50%;
  background:var(--teal); color:#fff; font-size:.75rem;
  border:2px solid var(--ink);
}

/* 数据条 */
.stats-bar { display:grid; grid-template-columns:repeat(4,1fr); gap:24px; text-align:center; }
.stat-item {
  padding:28px 18px; border-radius:var(--r);
  border:2px solid var(--ink); background:#fff;
  box-shadow:var(--shadow-sm); transition:.25s var(--ease);
}
.stat-item:hover{transform:translate(-3px,-3px); box-shadow:9px 9px 0 var(--coral);}
.stat-item:nth-child(2):hover{box-shadow:9px 9px 0 var(--teal);}
.stat-item:nth-child(3):hover{box-shadow:9px 9px 0 var(--lime);}
.stat-item:nth-child(4):hover{box-shadow:9px 9px 0 var(--coral);}
.stat-number {
  font-size:clamp(2rem,3.6vw,2.7rem); font-weight:900; letter-spacing:-1.5px;
  color:var(--teal); line-height:1.1;
  background:linear-gradient(100deg,var(--teal),var(--coral));
  -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent;
}
.stat-label { font-size:.88rem; color:var(--ink-soft); margin-top:8px; font-weight:600; letter-spacing:.5px; }

/* 内容墙 */
.content-wall { display:grid; grid-template-columns:repeat(auto-fill,minmax(280px,1fr)); gap:26px; }
.content-wall-item {
  border-radius:var(--r); overflow:hidden;
  border:2px solid var(--ink); background:#fff;
  box-shadow:var(--shadow-sm);
  transition:transform .25s var(--ease), box-shadow .25s var(--ease);
  display:flex; flex-direction:column;
}
.content-wall-item:hover { transform:translate(-3px,-3px); box-shadow:9px 9px 0 var(--teal); }
.content-wall-item img { width:100%; height:200px; object-fit:cover; border-bottom:2px solid var(--ink); }
.content-wall-body { padding:22px; flex:1; }
.content-wall-body h3{font-size:1.05rem; font-weight:800; margin-bottom:8px; letter-spacing:-.3px;}
.content-wall-body p{font-size:.9rem; color:var(--ink-soft);}

/* FAQ */
.faq-list { max-width:800px; margin:0 auto; }
.faq-item {
  border:2px solid var(--ink); border-radius:var(--r-sm);
  margin-bottom:12px; overflow:hidden; cursor:pointer;
  background:#fff; box-shadow:var(--shadow-sm);
  transition:.25s var(--ease);
}
.faq-item:hover{transform:translate(-2px,-2px); box-shadow:6px 6px 0 var(--ink);}
.faq-item .faq-question {
  padding:18px 22px; font-weight:800; font-size:1rem;
  display:flex; justify-content:space-between; align-items:center; gap:16px;
}
.faq-item .faq-question::after{
  content:'＋'; font-weight:900; font-size:1.1rem; color:var(--coral);
  flex:none; transition:transform .3s var(--ease); line-height:1;
}
.faq-item.open{background:var(--teal-soft); box-shadow:6px 6px 0 var(--teal);}
.faq-item.open .faq-question::after{transform:rotate(45deg); color:var(--teal);}
.faq-item .faq-answer { padding:0 22px 18px; display:none; color:var(--ink-soft); font-size:.95rem; }
.faq-item.open .faq-answer { display:block; animation:fadeUp .35s var(--ease) both; }
@keyframes fadeUp{from{opacity:0; transform:translateY(-6px);} to{opacity:1; transform:none;}}

/* CTA横幅 */
.cta-banner {
  padding:60px 28px; text-align:center; border-radius:24px; color:#fff;
  border:2px solid var(--ink); box-shadow:10px 10px 0 var(--ink);
  background:
    radial-gradient(circle at 88% 15%, rgba(217,242,78,.35), transparent 42%),
    radial-gradient(circle at 8% 90%, rgba(255,92,57,.45), transparent 45%),
    linear-gradient(135deg,#0E7C7B 0%, #17A39C 55%, #4FCFC0 100%);
  position:relative; overflow:hidden;
}
.cta-banner::before{
  content:''; position:absolute; inset:0;
  background-image:radial-gradient(circle, rgba(255,255,255,.28) 1px, transparent 1.4px);
  background-size:20px 20px; opacity:.5;
}
.cta-banner > *{position:relative; z-index:1;}
.cta-banner h2 { color:#fff; font-size:clamp(1.5rem,3.2vw,2.3rem); font-weight:900; letter-spacing:-1px; margin-bottom:12px; }
.cta-banner p{color:rgba(255,255,255,.9); max-width:560px; margin:0 auto 26px;}
.cta-banner .btn-primary { background:#fff; color:var(--ink); box-shadow:4px 4px 0 var(--ink); }
.cta-banner .btn-primary:hover{transform:translate(3px,3px); box-shadow:1px 1px 0 var(--ink); background:var(--lime);}

/* 页脚 */
.site-footer { padding:56px 0 28px; background:var(--paper-3); border-top:2px solid var(--ink); }
.site-footer .container { }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:40px; }
.footer-brand { }
.footer-brand .logo{margin-bottom:14px;}
.footer-brand p{font-size:.92rem; color:var(--ink-soft); max-width:320px;}
.footer-col { }
.footer-col h4{font-size:.95rem; font-weight:900; margin-bottom:14px; letter-spacing:.5px; position:relative; padding-bottom:8px;}
.footer-col h4::after{content:''; position:absolute; left:0; bottom:0; width:26px; height:3px; background:var(--coral); border-radius:2px;}
.footer-col ul{list-style:none;}
.footer-col li{margin-bottom:9px;}
.footer-col a{font-size:.9rem; color:var(--ink-soft); text-decoration:none; transition:.2s var(--ease);}
.footer-col a:hover{color:var(--coral); padding-left:5px;}
.footer-bottom {
  border-top:1px solid rgba(34,48,63,.18);
  margin-top:40px; padding-top:20px; text-align:center; font-size:.85rem;
  color:var(--ink-soft);
}

/* 工具类 */
.text-accent { color:var(--coral); font-weight:800; }
.text-center { text-align:center; }
.seo-description { max-width:600px; margin:0 auto 48px; color:var(--ink-soft); }
.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* ⚠️ 响应式 */
@media (max-width: 768px) {
  .feature-block { grid-template-columns:1fr; gap:36px; }
  .feature-image{box-shadow:8px 8px 0 var(--lime);}
  .stats-bar { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:1fr 1fr; }
  .main-nav {
    display:none;
  }
  .menu-toggle { display:flex; }
  .main-nav.open {
    display:flex; flex-direction:column; align-items:flex-start; gap:18px;
    position:absolute; top:68px; left:0; width:100%;
    background:var(--paper); padding:24px;
    border-bottom:2px solid var(--ink);
    box-shadow:0 8px 0 rgba(34,48,63,.08);
  }
  .main-nav.open .nav-cta{margin-top:6px;}
  .hero{padding:48px 0 56px;}
  .hero::after{opacity:.6;}
}
@media (max-width: 480px) {
  .cards-grid,.content-wall,.stats-bar { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr; }
  .hero-buttons { flex-direction:column; align-items:stretch; }
  .hero-buttons .btn{justify-content:center;}
  .section{padding:60px 0;}
  .cta-banner{padding:44px 20px; border-radius:18px;}
}