:root{
  --paper:#F7F4EB;
  --paper-deep:#EDE7D9;
  --white:#FFFFFF;
  --ink:#191033;
  --ink-soft:#5C5476;
  --lime:#CCF23F;
  --vermillion:#FF4B2B;
  --violet:#5B3DF5;
  --sky:#CFE5FF;
  --blush:#FFD9CF;
  --line:rgba(25,16,51,0.12);
  --border:2px solid var(--ink);
  --shadow:6px 6px 0 var(--ink);
  --shadow-sm:4px 4px 0 var(--ink);
  --r:3px;
}

/* 基础重置 */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x:hidden;
  background-color:var(--paper);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:56px 56px;
  color:var(--ink);
  line-height:1.65;
  letter-spacing:0.005em;
  -webkit-font-smoothing:antialiased;
}
img { max-width:100%; display:block; }
a { color:inherit; }
::selection { background:var(--lime); color:var(--ink); }
:focus-visible { outline:2px dashed var(--vermillion); outline-offset:3px; }

/* 核心布局 — 必须居中 */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }
.section { padding:80px 0; position:relative; }
.section:nth-child(even) { background:var(--white); }

/* 导航 — 固定顶部 */
.site-header {
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  background:rgba(247,244,235,0.92);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:var(--border);
}
.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:1.18rem; letter-spacing:-0.03em;
  text-decoration:none; color:var(--ink); white-space:nowrap;
}
.logo-icon {
  width:38px; height:38px; border-radius:var(--r);
  display:flex; align-items:center; justify-content:center;
  font-size:1rem; background:var(--lime);
  border:var(--border); box-shadow:3px 3px 0 var(--ink);
  transition:transform .25s cubic-bezier(.2,.8,.3,1.4);
}
.logo:hover .logo-icon { transform:rotate(-8deg) scale(1.06); }
.main-nav { display:flex; align-items:center; gap:26px; list-style:none; }
.main-nav a {
  text-decoration:none; font-size:0.9rem; font-weight:700;
  letter-spacing:0.01em; transition:.2s; position:relative;
  padding-bottom:3px;
}
.main-nav a::after {
  content:''; position:absolute; left:0; bottom:0; width:100%; height:2px;
  background:var(--vermillion); transform:scaleX(0); transform-origin:left;
  transition:transform .28s cubic-bezier(.2,.8,.3,1);
}
.main-nav a:hover { color:var(--vermillion); }
.main-nav a:hover::after { transform:scaleX(1); }
.nav-cta {
  padding:9px 20px; border-radius:var(--r); color:#fff!important;
  font-weight:800; background:var(--vermillion);
  border:var(--border); box-shadow:3px 3px 0 var(--ink);
  transition:.18s;
}
.nav-cta::after { display:none; }
.nav-cta:hover { transform:translate(-2px,-2px); box-shadow:5px 5px 0 var(--ink); }
.menu-toggle {
  display:none; align-items:center; justify-content:center;
  width:42px; height:38px; border-radius:var(--r);
  background:var(--lime); border:var(--border);
  box-shadow:3px 3px 0 var(--ink); font-size:1.05rem; cursor:pointer;
  color:var(--ink);
}

/* 首页Hero */
.hero {
  position:relative; overflow:hidden;
  min-height:70vh; display:flex; align-items:center;
  padding:150px 0 100px;
}
.hero::before {
  content:''; position:absolute; inset:0; pointer-events:none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:34px 34px;
  -webkit-mask-image:radial-gradient(120% 80% at 12% 30%, #000 10%, transparent 72%);
  mask-image:radial-gradient(120% 80% at 12% 30%, #000 10%, transparent 72%);
}
.hero::after {
  content:''; position:absolute; top:14%; right:-60px;
  width:420px; height:420px; border-radius:50%;
  border:2px solid var(--ink); opacity:.5; pointer-events:none;
  background:radial-gradient(circle at 34% 30%, rgba(204,242,63,0.55), transparent 62%);
}
.hero .container { position:relative; z-index:2; }
.hero-content { max-width:760px; }
.hero-eyebrow {
  display:inline-block; font-size:0.78rem; font-weight:800;
  letter-spacing:0.22em; text-transform:uppercase;
  padding:6px 16px; border-radius:999px; margin-bottom:22px;
  background:var(--lime); border:var(--border);
  box-shadow:3px 3px 0 var(--ink); color:var(--ink);
}
.hero h1 {
  font-size:clamp(2.4rem, 6.4vw, 4.6rem);
  line-height:1.05; margin-bottom:22px;
  font-weight:900; letter-spacing:-0.045em;
}
.hero h1 .hl {
  background:linear-gradient(transparent 60%, var(--lime) 60%);
  padding:0 .06em;
}
.hero p {
  font-size:clamp(1rem,1.6vw,1.14rem);
  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:var(--border); box-shadow:var(--shadow);
  background:var(--white);
}
.hero-image img { width:100%; height:auto; }

/* 按钮 */
.btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:13px 28px; border-radius:var(--r);
  font-weight:800; cursor:pointer; border:var(--border);
  text-decoration:none; transition:.18s cubic-bezier(.2,.8,.3,1);
  font-size:0.95rem; letter-spacing:0.01em;
}
.btn-primary {
  color:#fff; background:var(--vermillion);
  box-shadow:var(--shadow-sm);
}
.btn-primary:hover { transform:translate(-2px,-2px); box-shadow:8px 8px 0 var(--ink); }
.btn-outline { background:transparent; border:var(--border); color:var(--ink); }
.btn-outline:hover { background:var(--lime); transform:translate(-2px,-2px); box-shadow:var(--shadow-sm); }
.btn:active { transform:translate(2px,2px); box-shadow:none; }

/* 标签/标题 */
.section-label {
  display:inline-flex; align-items:center; gap:9px;
  font-size:0.74rem; font-weight:800; letter-spacing:0.26em;
  text-transform:uppercase; margin-bottom:16px; color:var(--ink);
}
.section-label::before {
  content:''; width:10px; height:10px; background:var(--vermillion);
  border:2px solid var(--ink); display:inline-block;
}
.section-title {
  font-size:clamp(1.75rem, 3.6vw, 2.6rem);
  margin-bottom:16px; font-weight:900; letter-spacing:-0.035em;
  line-height:1.12;
}
.section-desc {
  max-width:620px; color:var(--ink-soft);
  margin-bottom:44px; font-size:1.02rem;
}
.text-center .section-desc { margin-left:auto; margin-right:auto; }
.text-center .section-label { justify-content:center; }

/* 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:28px;
  border:var(--border); background:var(--white);
  box-shadow:var(--shadow-sm); transition:.22s cubic-bezier(.2,.8,.3,1);
  position:relative;
}
.category-card::after {
  content:''; position:absolute; top:0; right:0;
  width:14px; height:14px; background:var(--lime);
  border-left:2px solid var(--ink); border-bottom:2px solid var(--ink);
}
.category-card:hover { transform:translate(-3px,-3px); box-shadow:9px 9px 0 var(--ink); }
.category-card h3 { font-size:1.12rem; font-weight:800; letter-spacing:-0.02em; margin-bottom:8px; }
.category-card p { font-size:0.92rem; color:var(--ink-soft); margin-bottom:16px; }
.card-icon {
  width:48px; height:48px; border-radius:var(--r);
  display:flex; align-items:center; justify-content:center;
  margin-bottom:18px; font-size:1.3rem;
  background:var(--lime); border:var(--border);
}
.category-card:nth-child(3n+2) .card-icon { background:var(--sky); }
.category-card:nth-child(3n+3) .card-icon { background:var(--blush); }
.card-link {
  font-weight:800; font-size:0.84rem; text-decoration:none;
  color:var(--vermillion); letter-spacing:0.02em;
  border-bottom:2px solid var(--vermillion); padding-bottom:2px;
}
.card-link:hover { background:var(--lime); color:var(--ink); border-color:var(--ink); }

/* 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:var(--border); box-shadow:var(--shadow);
  background:var(--white);
}
.feature-image img { width:100%; height:auto; }
.feature-text .section-title { margin-bottom:14px; }
.feature-text p { color:var(--ink-soft); margin-bottom:22px; }
.feature-list { list-style:none; }
.feature-list li {
  padding:9px 0; display:flex; align-items:flex-start; gap:10px;
  font-weight:600; border-bottom:1px dashed var(--line);
  font-size:0.96rem;
}
.feature-list li:last-child { border-bottom:none; }
.feature-list li::before {
  content:'✓'; font-weight:900; color:var(--vermillion);
  line-height:1.4; flex:0 0 auto;
}

/* 数据条 */
.stats-bar {
  display:grid; grid-template-columns:repeat(4,1fr); gap:24px;
  text-align:center;
}
.stat-item {
  padding:28px 20px; border-radius:var(--r);
  border:var(--border); background:var(--white);
  box-shadow:var(--shadow-sm);
}
.stat-item:nth-child(1) { background:var(--lime); }
.stat-item:nth-child(2) { background:var(--white); }
.stat-item:nth-child(3) { background:var(--sky); }
.stat-item:nth-child(4) { background:var(--blush); }
.stat-number {
  font-size:clamp(2rem,4vw,2.7rem); font-weight:900;
  letter-spacing:-0.045em; line-height:1;
}
.stat-label {
  font-size:0.82rem; color:var(--ink); opacity:.72;
  margin-top:10px; letter-spacing:0.14em; text-transform:uppercase;
  font-weight:700;
}

/* 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:var(--border); background:var(--white);
  transition:.22s cubic-bezier(.2,.8,.3,1);
  box-shadow:var(--shadow-sm);
}
.content-wall-item:hover { transform:translate(-3px,-3px); box-shadow:9px 9px 0 var(--ink); }
.content-wall-item img {
  width:100%; height:200px; object-fit:cover;
  filter:grayscale(1) contrast(1.08);
  transition:filter .35s ease;
  border-bottom:var(--border);
}
.content-wall-item:hover img { filter:grayscale(0) contrast(1); }
.content-wall-body { padding:20px; }
.content-wall-body h3 { font-size:1.05rem; font-weight:800; letter-spacing:-0.02em; margin-bottom:8px; }
.content-wall-body p { font-size:0.9rem; color:var(--ink-soft); }

/* FAQ */
.faq-list { max-width:800px; margin:0 auto; }
.faq-item {
  border:var(--border); border-radius:var(--r);
  margin-bottom:12px; overflow:hidden; cursor:pointer;
  background:var(--white); transition:.2s;
}
.faq-item .faq-question {
  padding:18px 22px; font-weight:800; font-size:1rem;
  display:flex; justify-content:space-between; align-items:center; gap:16px;
  letter-spacing:-0.01em;
}
.faq-item .faq-question::after {
  content:'+'; font-size:1.3rem; font-weight:900;
  color:var(--vermillion); transition:transform .25s;
  line-height:1;
}
.faq-item.open .faq-question::after { transform:rotate(45deg); }
.faq-item .faq-answer {
  padding:0 22px 18px; display:none; opacity:1;
  color:var(--ink-soft); font-size:0.95rem;
}
.faq-item.open .faq-answer { display:block; }
.faq-item.open { box-shadow:var(--shadow); background:var(--white); }
.faq-item.open .faq-question { background:var(--lime); border-bottom:var(--border); }

/* CTA横幅 */
.cta-banner {
  padding:64px 24px; text-align:center; border-radius:var(--r);
  background:
    repeating-linear-gradient(135deg, rgba(25,16,51,0.055) 0 12px, transparent 12px 24px),
    var(--lime);
  border:var(--border); box-shadow:var(--shadow);
  color:var(--ink);
}
.cta-banner h2 {
  color:var(--ink); font-size:clamp(1.6rem,3.4vw,2.4rem);
  font-weight:900; letter-spacing:-0.04em; line-height:1.1;
  margin-bottom:14px;
}
.cta-banner p { color:var(--ink); opacity:.78; margin:0 auto 26px; max-width:520px; }
.cta-banner .btn-primary { background:#fff; color:var(--ink); border:var(--border); }
.cta-banner .btn-primary:hover { background:var(--vermillion); color:#fff; }

/* 页脚 */
.site-footer {
  padding:64px 0 28px;
  background:var(--paper-deep);
  border-top:var(--border);
}
.site-footer .container { position:relative; }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:40px; }
.footer-brand .logo { margin-bottom:14px; }
.footer-brand p { font-size:0.9rem; color:var(--ink-soft); max-width:320px; }
.footer-col h4 {
  font-size:0.76rem; font-weight:900; letter-spacing:0.22em;
  text-transform:uppercase; margin-bottom:16px;
}
.footer-col a {
  display:block; padding:5px 0; font-size:0.9rem;
  color:var(--ink-soft); text-decoration:none; transition:.18s;
}
.footer-col a:hover { color:var(--vermillion); transform:translateX(4px); }
.footer-bottom {
  border-top:1px dashed rgba(25,16,51,0.3); margin-top:44px;
  padding-top:20px; text-align:center; font-size:0.84rem;
  color:var(--ink-soft); letter-spacing:0.04em;
}

/* 工具类 */
.text-accent { color:var(--vermillion); }
.text-center { text-align:center; }
.seo-description {
  max-width:620px; margin:0 auto 48px; color:var(--ink-soft);
  font-size:0.98rem;
}
.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* ⚠️ 响应式 */
@media (max-width: 768px) {
  .section { padding:60px 0; }
  .hero { padding:118px 0 70px; min-height:auto; }
  .hero::after { display:none; }
  .feature-block { grid-template-columns:1fr; gap:32px; }
  .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:stretch;
    position:absolute; top:68px; left:0; width:100%;
    background:var(--paper); padding:20px 24px;
    border-bottom:var(--border); gap:6px;
    box-shadow:0 12px 0 rgba(25,16,51,0.06);
  }
  .main-nav.open a { padding:10px 0; border-bottom:1px dashed var(--line); }
  .main-nav.open .nav-cta { text-align:center; margin-top:12px; border-bottom:none; }
}
@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; }
  .hero-buttons .btn { justify-content:center; width:100%; }
  .cta-banner { padding:44px 18px; }
  .stat-number { font-size:2.2rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition:none !important; animation:none !important; }
  html { scroll-behavior:auto; }
}