:root{
  --paper:#F5F1E8;
  --paper-warm:#EFE9DB;
  --paper-card:#FFFDF7;
  --ink:#141328;
  --ink-soft:#555172;
  --line:#D9D1BF;
  --vermilion:#FF4A1C;
  --vermilion-soft:#FFE7DE;
  --violet:#3A22D4;
  --violet-soft:#E7E3FF;
  --lime:#D9F24B;
  --teal:#0E8074;
  --radius-s:4px;
  --radius-m:8px;
  --radius-l:14px;
  --shadow-hard:6px 6px 0 rgba(20,19,40,.08);
  --shadow-hard-ink:6px 6px 0 var(--ink);
  --shadow-hover:9px 9px 0 var(--vermilion);
}

*, *::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);
  color:var(--ink);
  line-height:1.7;
  font-size:16px;
  letter-spacing:.01em;
  position:relative;
}

body::before{
  content:'';
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  background-image:
    linear-gradient(to right, rgba(20,19,40,.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20,19,40,.035) 1px, transparent 1px);
  background-size:92px 92px;
  mask-image:radial-gradient(circle at 50% 30%, #000 0%, transparent 85%);
  -webkit-mask-image:radial-gradient(circle at 50% 30%, #000 0%, transparent 85%);
}

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

a{ color:inherit; }

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

h1,h2,h3,h4{ line-height:1.15; font-weight:800; letter-spacing:-.02em; }

h3{ font-size:1.15rem; margin-bottom:10px; }

:focus-visible{ outline:2.5px dashed var(--violet); outline-offset:3px; }

/* 核心布局 */
.container { max-width:1200px; margin:0 auto; padding:0 24px; position:relative; z-index:1; }

.section { padding:80px 0; position:relative; }

.section:nth-child(even) { background:var(--paper-warm); }

.section:nth-child(even)::before{
  content:'';
  position:absolute;
  top:0; left:0; right:0;
  height:1px;
  background:repeating-linear-gradient(to right, var(--line) 0 8px, transparent 8px 16px);
}

/* 导航 */
.site-header {
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  background:rgba(245,241,232,.88);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line);
}
.site-header::before{
  content:'';
  position:absolute; top:0; left:0;
  width:100%; height:3px;
  background:linear-gradient(90deg, var(--vermilion) 0 34%, var(--violet) 34% 67%, var(--ink) 67% 100%);
}

.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:1.2rem; text-decoration:none; color:var(--ink);
  letter-spacing:-.03em;
}
.logo-icon {
  width:36px; height:36px; border-radius:var(--radius-s);
  display:flex; align-items:center; justify-content:center;
  font-size:1rem;
  background:var(--vermilion);
  color:#fff;
  border:1.5px solid var(--ink);
  box-shadow:3px 3px 0 var(--ink);
  transform:rotate(-6deg);
  transition:transform .25s cubic-bezier(.34,1.56,.64,1);
}
.logo:hover .logo-icon{ transform:rotate(6deg) scale(1.06); }

.main-nav { display:flex; align-items:center; gap:26px; list-style:none; }
.main-nav a {
  text-decoration:none; font-size:.9rem; font-weight:600; color:var(--ink-soft);
  transition:color .2s, transform .2s;
  position:relative;
}
.main-nav a::after{
  content:'';
  position:absolute; left:0; bottom:-5px;
  width:100%; height:2px;
  background:var(--vermilion);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .28s cubic-bezier(.65,0,.35,1);
}
.main-nav a:hover{ color:var(--ink); }
.main-nav a:hover::after{ transform:scaleX(1); }

.nav-cta {
  padding:9px 22px; border-radius:var(--radius-s);
  color:#fff!important; font-weight:700;
  background:var(--vermilion);
  border:1.5px solid var(--ink);
  box-shadow:3px 3px 0 var(--ink);
  transition:transform .2s, box-shadow .2s;
}
.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;
  background:var(--paper-card);
  border:1.5px solid var(--ink);
  border-radius:var(--radius-s);
  box-shadow:3px 3px 0 var(--ink);
  cursor:pointer;
  font-size:1rem; font-weight:800; color:var(--ink);
}

/* Hero */
.hero {
  min-height:70vh;
  display:flex; align-items:center;
  padding:150px 0 90px;
  position:relative;
  overflow:hidden;
}
.hero::before{
  content:'';
  position:absolute; inset:0;
  background:
    radial-gradient(620px 420px at 10% 18%, rgba(255,74,28,.13), transparent 66%),
    radial-gradient(560px 460px at 90% 76%, rgba(58,34,212,.12), transparent 66%),
    radial-gradient(420px 320px at 70% 6%, rgba(217,242,75,.30), transparent 70%);
  pointer-events:none;
}
.hero::after{
  content:'真相档案';
  position:absolute;
  right:-2vw; top:50%;
  transform:translateY(-50%) rotate(90deg);
  transform-origin:center;
  font-size:clamp(3rem,9vw,7.5rem);
  font-weight:900;
  letter-spacing:.15em;
  color:transparent;
  -webkit-text-stroke:1px rgba(20,19,40,.09);
  pointer-events:none;
  user-select:none;
}

.hero-content { max-width:720px; position:relative; z-index:2; }

.hero-eyebrow {
  display:inline-block;
  font-size:.78rem; font-weight:800;
  letter-spacing:.22em;
  padding:6px 16px;
  border-radius:100px;
  margin-bottom:22px;
  color:var(--vermilion);
  background:var(--vermilion-soft);
  border:1.5px dashed var(--vermilion);
  text-transform:uppercase;
}

.hero h1 {
  font-size:clamp(2.3rem,5.6vw,3.9rem);
  line-height:1.08;
  margin-bottom:22px;
  font-weight:900;
  letter-spacing:-.035em;
}
.hero h1 em{
  font-style:normal;
  position:relative;
  color:var(--violet);
  white-space:nowrap;
}
.hero h1 em::after{
  content:'';
  position:absolute; left:0; bottom:.06em;
  width:100%; height:.28em;
  background:var(--lime);
  z-index:-1;
  transform:skewX(-12deg);
}

.hero p {
  font-size:1.08rem;
  color:var(--ink-soft);
  max-width:560px;
  margin-bottom:34px;
}

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

.hero-image {
  border-radius:var(--radius-s);
  overflow:hidden;
  border:1.5px solid var(--ink);
  box-shadow:var(--shadow-hard-ink);
  position:relative;
}
.hero-image img { width:100%; height:auto; }

/* 按钮 */
.btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:13px 30px;
  border-radius:var(--radius-s);
  font-weight:700; font-size:.95rem;
  cursor:pointer; border:none; text-decoration:none;
  transition:transform .22s cubic-bezier(.34,1.4,.64,1), box-shadow .22s, background .22s, color .22s;
  letter-spacing:.02em;
}
.btn-primary {
  color:#fff;
  background:var(--ink);
  border:1.5px solid var(--ink);
  box-shadow:4px 4px 0 var(--vermilion);
}
.btn-primary:hover{
  transform:translate(-3px,-3px);
  box-shadow:7px 7px 0 var(--vermilion);
}
.btn-outline {
  background:transparent;
  border:1.5px solid var(--ink);
  color:var(--ink);
}
.btn-outline:hover{
  background:var(--ink);
  color:#fff;
  transform:translate(-3px,-3px);
  box-shadow:7px 7px 0 var(--violet);
}

/* 标签 / 标题 */
.section-label {
  display:inline-flex; align-items:center; gap:10px;
  font-size:.75rem; font-weight:800;
  letter-spacing:.26em;
  margin-bottom:16px;
  color:var(--violet);
  text-transform:uppercase;
}
.section-label::before{
  content:'';
  width:12px; height:12px;
  background:var(--vermilion);
  border:1.5px solid var(--ink);
  transform:rotate(45deg);
  flex:none;
}

.section-title {
  font-size:clamp(1.6rem,3.4vw,2.5rem);
  margin-bottom:18px;
  position:relative;
  padding-bottom:18px;
}
.section-title::after{
  content:'';
  position:absolute; left:0; bottom:0;
  width:64px; height:6px;
  background:var(--vermilion);
}

.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:28px;
}
.category-card {
  border-radius:var(--radius-s);
  padding:30px 28px;
  background:var(--paper-card);
  border:1.5px solid var(--ink);
  box-shadow:var(--shadow-hard);
  transition:transform .25s cubic-bezier(.34,1.3,.64,1), box-shadow .25s, background .25s;
  position:relative;
  overflow:hidden;
}
.category-card::after{
  content:'';
  position:absolute; top:0; right:0;
  width:56px; height:56px;
  background:var(--lime);
  clip-path:polygon(100% 0, 0 0, 100% 100%);
  opacity:.55;
  transition:opacity .25s;
}
.category-card:hover {
  transform:translate(-3px,-3px);
  box-shadow:var(--shadow-hover);
  background:#fff;
}
.category-card:hover::after{ opacity:1; }

.card-icon {
  width:50px; height:50px;
  border-radius:var(--radius-s);
  display:flex; align-items:center; justify-content:center;
  margin-bottom:18px;
  font-size:1.25rem;
  background:var(--violet-soft);
  border:1.5px solid var(--ink);
  box-shadow:3px 3px 0 var(--ink);
}
.category-card:nth-child(3n+1) .card-icon{ background:var(--lime); }
.category-card:nth-child(3n+2) .card-icon{ background:var(--vermilion-soft); }

.card-link {
  font-weight:800; font-size:.84rem;
  text-decoration:none;
  color:var(--vermilion);
  letter-spacing:.04em;
  display:inline-flex; align-items:center; gap:6px;
  margin-top:12px;
}
.card-link::after{
  content:'→';
  transition:transform .25s;
}
.card-link:hover::after{ transform:translateX(4px); }

/* 特性块 */
.feature-block {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:56px;
  align-items:center;
}
.feature-image {
  border-radius:var(--radius-s);
  overflow:hidden;
  border:1.5px solid var(--ink);
  box-shadow:9px 9px 0 var(--violet);
  position:relative;
}
.feature-image img { width:100%; height:auto; }

.feature-text { }
.feature-text h2{ font-size:clamp(1.5rem,2.8vw,2.1rem); margin-bottom:16px; }
.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:12px;
  font-weight:600;
  border-bottom:1px dashed var(--line);
  color:var(--ink);
}
.feature-list li::before {
  content:'✓';
  font-weight:900;
  flex:none;
  width:22px; height:22px;
  display:flex; align-items:center; justify-content:center;
  font-size:.75rem;
  border-radius:50%;
  background:var(--lime);
  border:1.5px solid var(--ink);
  color:var(--ink);
  margin-top:2px;
}

/* 数据条 */
.stats-bar {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
  text-align:center;
}
.stat-item {
  padding:30px 20px;
  border-radius:var(--radius-s);
  border:1.5px solid var(--ink);
  background:var(--paper-card);
  box-shadow:var(--shadow-hard);
  position:relative;
  transition:transform .25s, box-shadow .25s;
}
.stat-item:hover{ transform:translateY(-4px); box-shadow:8px 10px 0 rgba(20,19,40,.12); }
.stat-number {
  font-size:clamp(1.9rem,3.4vw,2.6rem);
  font-weight:900;
  letter-spacing:-.04em;
  font-variant-numeric:tabular-nums;
  line-height:1.1;
}
.stat-item:nth-child(1) .stat-number{ color:var(--vermilion); }
.stat-item:nth-child(2) .stat-number{ color:var(--violet); }
.stat-item:nth-child(3) .stat-number{ color:var(--teal); }
.stat-item:nth-child(4) .stat-number{ color:var(--ink); }

.stat-label {
  font-size:.82rem;
  color:var(--ink-soft);
  margin-top:8px;
  letter-spacing:.12em;
  font-weight:600;
}

/* 内容墙 */
.content-wall {
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:26px;
}
.content-wall-item {
  border-radius:var(--radius-s);
  overflow:hidden;
  background:var(--paper-card);
  border:1.5px solid var(--ink);
  box-shadow:var(--shadow-hard);
  transition:transform .25s cubic-bezier(.34,1.3,.64,1), box-shadow .25s;
}
.content-wall-item:hover {
  transform:translate(-3px,-3px);
  box-shadow:var(--shadow-hover);
}
.content-wall-item img {
  width:100%; height:200px;
  object-fit:cover;
  filter:saturate(.55) contrast(1.06);
  transition:filter .35s, transform .55s;
}
.content-wall-item:hover img{ filter:saturate(1.05) contrast(1); transform:scale(1.05); }

.content-wall-body { padding:22px; }
.content-wall-body h3{ font-size:1.05rem; margin-bottom:8px; }
.content-wall-body p{ font-size:.9rem; color:var(--ink-soft); }

/* FAQ */
.faq-list { max-width:800px; margin:0 auto; }
.faq-item {
  background:var(--paper-card);
  border:1.5px solid var(--line);
  border-radius:var(--radius-s);
  margin-bottom:10px;
  overflow:hidden;
  cursor:pointer;
  transition:border-color .22s, box-shadow .22s, transform .22s;
}
.faq-item:hover{ border-color:var(--ink); transform:translateX(3px); }
.faq-item .faq-question {
  padding:18px 22px;
  font-weight:700;
  display:flex; justify-content:space-between; align-items:center; gap:16px;
}
.faq-item .faq-question::after{
  content:'+';
  font-size:1.3rem;
  font-weight:800;
  color:var(--vermilion);
  transition:transform .3s;
  flex:none;
  line-height:1;
}
.faq-item.open{
  border-color:var(--ink);
  box-shadow:5px 5px 0 rgba(255,74,28,.35);
  background:#fff;
}
.faq-item.open .faq-question::after{ transform:rotate(45deg); }
.faq-item .faq-answer {
  padding:0 22px 18px;
  display:none;
  color:var(--ink-soft);
  font-size:.95rem;
  border-top:1px dashed var(--line);
  padding-top:16px;
  margin:0 22px 18px;
  padding-left:0; padding-right:0;
}
.faq-item.open .faq-answer { display:block; }

/* CTA横幅 */
.cta-banner {
  padding:64px 32px;
  text-align:center;
  border-radius:var(--radius-m);
  color:#fff;
  background:linear-gradient(118deg, var(--vermilion) 0%, #C42C6B 46%, var(--violet) 100%);
  border:1.5px solid var(--ink);
  box-shadow:10px 10px 0 var(--ink);
  position:relative;
  overflow:hidden;
}
.cta-banner::before{
  content:'';
  position:absolute;
  inset:0;
  background-image:radial-gradient(circle, rgba(255,255,255,.22) 1.2px, transparent 1.3px);
  background-size:16px 16px;
  opacity:.5;
  pointer-events:none;
}
.cta-banner h2 {
  color:#fff;
  font-size:clamp(1.5rem,3.2vw,2.2rem);
  margin-bottom:14px;
  position:relative;
}
.cta-banner p{
  max-width:560px;
  margin:0 auto 30px;
  position:relative;
  opacity:.92;
}
.cta-banner .btn-primary { background:#fff; color:var(--vermilion); border-color:#fff; box-shadow:4px 4px 0 rgba(20,19,40,.35); position:relative; }
.cta-banner .btn-primary:hover{ box-shadow:7px 7px 0 rgba(20,19,40,.35); }
.cta-banner .btn-outline{ border-color:#fff; color:#fff; position:relative; }
.cta-banner .btn-outline:hover{ background:#fff; color:var(--violet); box-shadow:7px 7px 0 rgba(20,19,40,.35); }

/* 页脚 */
.site-footer {
  padding:64px 0 28px;
  background:var(--paper-warm);
  border-top:1.5px solid var(--ink);
  position:relative;
}
.site-footer::before{
  content:'';
  position:absolute; top:6px; left:0; right:0;
  height:1px;
  background:repeating-linear-gradient(to right, var(--line) 0 6px, transparent 6px 14px);
}
.site-footer .container { position:relative; z-index:1; }

.footer-grid {
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:40px;
}
.footer-brand { }
.footer-brand p{ color:var(--ink-soft); font-size:.92rem; max-width:340px; margin-top:14px; }

.footer-col { }
.footer-col h4{
  font-size:.82rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--violet);
  margin-bottom:16px;
}
.footer-col ul{ list-style:none; }
.footer-col li{ margin-bottom:9px; }
.footer-col a{
  text-decoration:none;
  color:var(--ink-soft);
  font-size:.9rem;
  transition:color .2s, padding-left .2s;
}
.footer-col a:hover{ color:var(--vermilion); padding-left:5px; }

.footer-bottom {
  border-top:1px solid var(--line);
  margin-top:44px;
  padding-top:20px;
  text-align:center;
  font-size:.83rem;
  color:var(--ink-soft);
  letter-spacing:.04em;
}

/* 工具类 */
.text-accent { color:var(--vermilion); font-weight:800; }
.text-center { text-align:center; }
.seo-description { max-width:600px; margin:0 auto 48px; color:var(--ink-soft); }
.text-center .section-title::after{ left:50%; transform:translateX(-50%); }
.text-center .section-label{ justify-content:center; }
.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* 响应式 */
@media (max-width: 992px){
  .footer-grid { grid-template-columns:1.6fr 1fr 1fr; }
}

@media (max-width: 768px) {
  .section{ padding:64px 0; }
  .hero{ padding:120px 0 70px; }
  .hero::after{ display:none; }
  .feature-block { grid-template-columns:1fr; gap:36px; }
  .feature-image{ box-shadow:7px 7px 0 var(--violet); }
  .stats-bar { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:1fr 1fr; gap:32px; }
  .main-nav { display:none; }
  .menu-toggle { display:flex; }
  .main-nav.open {
    display:flex;
    flex-direction:column;
    align-items:flex-start;
    position:absolute;
    top:68px; left:0;
    width:100%;
    background:var(--paper-card);
    padding:22px 24px 28px;
    gap:18px;
    border-bottom:1.5px solid var(--ink);
    box-shadow:0 10px 0 rgba(20,19,40,.08);
  }
  .main-nav.open a{ font-size:1rem; color:var(--ink); }
}

@media (max-width: 480px) {
  .container{ padding:0 18px; }
  .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; }
  .cta-banner{ padding:44px 20px; box-shadow:7px 7px 0 var(--ink); }
  .category-card,.stat-item,.content-wall-item,.hero-image{ box-shadow:5px 5px 0 rgba(20,19,40,.10); }
  .hero-image,.feature-image{ box-shadow:6px 6px 0 var(--ink); }
}