/* ============================================================
   社区黑料网 · 求证为先 — Design System "Paper File"
   浅色纸感 / 编辑部勘误风 / 硬阴影 / 网格纸底
   Palette: 米纸 #FBF7EF · 墨 #17252C · 朱红 #E4572E · 靛青 #0E7C6F
           柠檬 #FFE07A · 薄荷 #CBE7D6
   ============================================================ */

:root{
  --paper:#FBF7EF;
  --paper-mint:#F0F6F0;
  --card:#FFFFFF;

  --ink:#17252C;
  --ink-70:rgba(23,37,44,.70);
  --ink-55:rgba(23,37,44,.55);
  --ink-30:rgba(23,37,44,.30);
  --ink-12:rgba(23,37,44,.12);

  --line:#E4DAC9;

  --vermillion:#E4572E;
  --vermillion-soft:#F08A63;
  --teal:#0E7C6F;
  --lemon:#FFE07A;
  --mint:#CBE7D6;

  --shadow-soft:6px 6px 0 rgba(23,37,44,.08);
  --shadow-mint:6px 6px 0 var(--mint);
  --shadow-hard:4px 4px 0 var(--ink);

  --nav-h:68px;
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

html{
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--nav-h) + 20px);
  -webkit-text-size-adjust:100%;
}

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x:hidden;
  color:var(--ink);
  font-size:16px;
  line-height:1.65;
  background-color:var(--paper);
  background-image:
    linear-gradient(to right, rgba(23,37,44,.038) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(23,37,44,.038) 1px, transparent 1px);
  background-size:28px 28px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4{
  font-weight:800;
  letter-spacing:-.018em;
  line-height:1.18;
  color:var(--ink);
}

p{ color:var(--ink-70); }
a{ color:inherit; }
img{ display:block; max-width:100%; }
ul,ol{ list-style:none; }

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

a:focus-visible, button:focus-visible, .btn:focus-visible, .faq-item:focus-visible{
  outline:3px solid var(--teal);
  outline-offset:3px;
}

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

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

.section:nth-child(even) {
  background:var(--paper-mint);
  box-shadow:inset 0 1px 0 rgba(23,37,44,.06), inset 0 -1px 0 rgba(23,37,44,.06);
}

/* ---------- 导航 ---------- */
.site-header {
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  background:rgba(251,247,239,.88);
  -webkit-backdrop-filter:blur(12px) saturate(1.4);
  backdrop-filter:blur(12px) saturate(1.4);
  border-bottom:1px solid var(--ink);
}

.site-header::before{
  content:"";
  position:absolute; top:0; left:0; width:100%; height:3px;
  background:linear-gradient(90deg,
    var(--vermillion) 0%, var(--vermillion) 34%,
    var(--lemon) 34%, var(--lemon) 62%,
    var(--teal) 62%, var(--teal) 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:8px;
  font-weight:700; font-size:1.2rem; text-decoration:none; color:inherit;
  letter-spacing:-.02em;
}

.logo-icon {
  width:36px; height:36px; border-radius:2px;
  display:flex; align-items:center; justify-content:center;
  font-size:1rem; font-weight:800;
  background:var(--lemon);
  border:1.5px solid var(--ink);
  box-shadow:3px 3px 0 var(--ink);
  transform:rotate(-4deg);
  transition:transform .25s cubic-bezier(.34,1.56,.64,1);
}
.logo:hover .logo-icon{ transform:rotate(6deg) scale(1.04); }

.logo span, .logo b{ font-weight:800; }

.main-nav {
  display:flex; align-items:center; gap:24px; list-style:none;
}

.main-nav a {
  text-decoration:none; font-size:.9rem; font-weight:500;
  transition:.2s;
  position:relative;
  padding:6px 0;
  color:var(--ink-70);
  letter-spacing:.01em;
}
.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(.65,.05,.36,1);
}
.main-nav a:hover{ color:var(--ink); }
.main-nav a:hover::after{ transform:scaleX(1); }

.nav-cta {
  padding:8px 20px; border-radius:2px; color:#fff!important; font-weight:600;
  background:var(--vermillion);
  border:1.5px solid var(--ink);
  box-shadow:3px 3px 0 var(--ink);
  transition:transform .18s, box-shadow .18s, background .18s;
}
.nav-cta::after{ display:none; }
.nav-cta:hover{
  background:var(--teal);
  transform:translate(2px,2px);
  box-shadow:1px 1px 0 var(--ink);
}

.menu-toggle {
  display:none;
  width:40px; height:40px;
  align-items:center; justify-content:center;
  background:var(--card);
  border:1.5px solid var(--ink);
  border-radius:2px;
  box-shadow:3px 3px 0 var(--mint);
  cursor:pointer;
  font-size:1.1rem;
  font-weight:700;
  color:var(--ink);
}
.menu-toggle::before{ content:"≡"; line-height:1; }

/* ---------- Hero ---------- */
.hero {
  min-height:70vh;
  display:flex; align-items:center;
  padding:calc(var(--nav-h) + 64px) 0 88px;
  position:relative;
  overflow:hidden;
}

.hero::after{
  content:"";
  position:absolute;
  right:-140px; top:12%;
  width:420px; height:420px;
  border-radius:50%;
  background:radial-gradient(circle at 30% 30%, var(--mint) 0%, rgba(203,231,214,0) 68%);
  pointer-events:none;
  z-index:0;
}

.hero-content { max-width:720px; position:relative; z-index:1; }

.hero-eyebrow {
  display:inline-block; font-size:.85rem; font-weight:600;
  padding:6px 16px; border-radius:20px; margin-bottom:20px;
  background:var(--lemon);
  border:1.5px solid var(--ink);
  letter-spacing:.06em;
  color:var(--ink);
  box-shadow:3px 3px 0 var(--ink);
}

.hero h1 {
  font-size:2.8rem;
  line-height:1.14;
  margin-bottom:20px;
  letter-spacing:-.03em;
  font-weight:800;
}
.hero h1 strong, .hero h1 em{
  font-style:normal;
  font-weight:800;
  background:linear-gradient(transparent 60%, var(--lemon) 60%);
  padding:0 .06em;
}

.hero p {
  font-size:1.1rem; opacity:.7; max-width:560px; margin-bottom:32px;
  line-height:1.75;
}

.hero-buttons { display:flex; gap:14px; flex-wrap:wrap; }

.hero-image {
  border-radius:2px; overflow:hidden;
  border:2px solid var(--ink);
  box-shadow:12px 12px 0 var(--mint);
  background:var(--card);
}
.hero-image img { width:100%; height:auto; }

/* ---------- 按钮 ---------- */
.btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:13px 28px; border-radius:2px;
  font-weight:700; cursor:pointer; border:none;
  text-decoration:none; transition:transform .18s, box-shadow .18s, background .18s, color .18s;
  font-size:.95rem;
  letter-spacing:.01em;
  line-height:1;
}

.btn-primary {
  color:#fff;
  background:var(--vermillion);
  border:1.5px solid var(--ink);
  box-shadow:var(--shadow-hard);
}
.btn-primary:hover{
  background:var(--teal);
  transform:translate(3px,3px);
  box-shadow:1px 1px 0 var(--ink);
}

.btn-outline {
  background:transparent; border:1.5px solid var(--ink);
  color:var(--ink);
  box-shadow:4px 4px 0 var(--lemon);
}
.btn-outline:hover{
  background:var(--lemon);
  transform:translate(3px,3px);
  box-shadow:1px 1px 0 var(--ink);
}

/* ---------- 标签 / 标题 ---------- */
.section-label {
  display:inline-block; font-size:.8rem; font-weight:600;
  letter-spacing:2px; margin-bottom:12px;
  letter-spacing:.3em;
  color:var(--teal);
  text-transform:uppercase;
}
.section-label::before{
  content:"◆";
  font-size:.62em;
  color:var(--vermillion);
  margin-right:9px;
  vertical-align:2px;
}

.section-title {
  font-size:2rem; margin-bottom:14px;
  font-weight:800;
  letter-spacing:-.025em;
  position:relative;
  padding-bottom:16px;
}
.section-title::after{
  content:"";
  position:absolute; left:0; bottom:0;
  width:56px; height:4px;
  background:var(--lemon);
  border-radius:1px;
  box-shadow:14px 0 0 var(--vermillion);
}
.text-center .section-title::after{
  left:50%; transform:translateX(-50%);
  margin-left:-35px;
}

.section-desc {
  max-width:600px; opacity:.7; margin-bottom:40px;
  color:var(--ink-70);
  line-height:1.75;
}

/* ---------- 卡片网格 ---------- */
.cards-grid {
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:24px;
}

.category-card {
  border-radius:2px; padding:28px;
  border:1.5px solid var(--ink);
  transition:transform .22s cubic-bezier(.34,1.4,.64,1), box-shadow .22s;
  background:var(--card);
  box-shadow:var(--shadow-mint);
  position:relative;
}
.category-card:hover {
  transform:translate(-3px,-3px);
  box-shadow:9px 9px 0 var(--mint);
}
.category-card h3{
  font-size:1.08rem;
  margin-bottom:8px;
  letter-spacing:-.01em;
}
.category-card p{
  font-size:.9rem;
  line-height:1.7;
  margin-bottom:16px;
}

.card-icon {
  width:48px; height:48px; border-radius:2px;
  display:flex; align-items:center; justify-content:center;
  margin-bottom:16px; font-size:1.3rem;
  background:var(--lemon);
  border:1.5px solid var(--ink);
}
.category-card:nth-child(4n+2) .card-icon{ background:var(--mint); }
.category-card:nth-child(4n+3) .card-icon{ background:var(--vermillion-soft); }
.category-card:nth-child(4n+4) .card-icon{ background:#DCE7F2; }

.card-link {
  font-weight:600; font-size:.85rem; text-decoration:none;
  color:var(--vermillion);
  letter-spacing:.02em;
  display:inline-flex; align-items:center; gap:6px;
}
.card-link::after{ content:"→"; transition:transform .2s; }
.card-link:hover::after{ transform:translateX(4px); }
.card-link:hover{ color:var(--teal); }

/* ---------- 特性块 ---------- */
.feature-block {
  display:grid; grid-template-columns:1fr 1fr;
  gap:56px; align-items:center;
}

.feature-image {
  border-radius:2px; overflow:hidden;
  border:2px solid var(--ink);
  box-shadow:-12px 12px 0 var(--lemon);
  background:var(--card);
}
.feature-image img { width:100%; height:auto; }

.feature-text h2{ font-size:1.9rem; margin-bottom:14px; }
.feature-text > p{ margin-bottom:24px; line-height:1.8; }

.feature-list { list-style:none; }
.feature-list li {
  padding:6px 0; display:flex; align-items:center; gap:8px;
  font-size:.95rem;
  color:var(--ink-70);
  border-bottom:1px dashed var(--ink-12);
}
.feature-list li:last-child{ border-bottom:none; }
.feature-list li::before {
  content:'✓'; font-weight:700;
  color:var(--teal);
  font-size:.9rem;
  width:22px; height:22px;
  display:inline-flex; align-items:center; justify-content:center;
  background:var(--mint);
  border-radius:50%;
  flex:0 0 22px;
}

/* ---------- 数据条 ---------- */
.stats-bar {
  display:grid; grid-template-columns:repeat(4,1fr);
  gap:24px; text-align:center;
}

.stat-item {
  padding:24px; border-radius:2px;
  border:1.5px solid var(--ink);
  background:var(--card);
  transition:background .22s, transform .22s, box-shadow .22s;
  box-shadow:5px 5px 0 rgba(23,37,44,.08);
}
.stat-item:nth-child(2n){ background:#F7FBF6; }
.stat-item:hover{
  background:var(--lemon);
  transform:translate(-2px,-2px);
  box-shadow:7px 7px 0 var(--ink);
}

.stat-number {
  font-size:2.2rem; font-weight:800;
  letter-spacing:-.04em;
  font-variant-numeric:tabular-nums;
  line-height:1.1;
  color:var(--ink);
}
.stat-number::after{
  content:"";
  display:block;
  width:26px; height:3px;
  background:var(--vermillion);
  margin:9px auto 0;
  border-radius:1px;
}
.stat-label { font-size:.9rem; opacity:.6; margin-top:6px; letter-spacing:.06em; }

/* ---------- 内容墙 ---------- */
.content-wall {
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:24px;
}

.content-wall-item {
  border-radius:2px; overflow:hidden;
  border:1.5px solid var(--ink);
  transition:transform .22s cubic-bezier(.34,1.4,.64,1), box-shadow .22s;
  background:var(--card);
  box-shadow:5px 5px 0 var(--mint);
}
.content-wall-item:hover {
  transform:translate(-3px,-3px);
  box-shadow:9px 9px 0 var(--mint);
}
.content-wall-item img {
  width:100%; height:200px; object-fit:cover;
  filter:saturate(.92) contrast(1.04);
  border-bottom:1.5px solid var(--ink);
  transition:filter .3s, transform .5s;
}
.content-wall-item:hover img{ filter:saturate(1.1) contrast(1.06); transform:scale(1.03); }

.content-wall-body { padding:20px; }
.content-wall-body h3{ font-size:1.02rem; margin-bottom:8px; }
.content-wall-body p{ font-size:.88rem; line-height:1.7; color:var(--ink-55); }
.content-wall-body time, .content-wall-body span{
  font-size:.75rem; letter-spacing:.14em; color:var(--teal);
  text-transform:uppercase; font-weight:600;
  display:inline-block; margin-bottom:8px;
}

/* ---------- FAQ ---------- */
.faq-list { max-width:800px; margin:0 auto; }

.faq-item {
  border:1.5px solid var(--ink); border-radius:2px;
  margin-bottom:8px; overflow:hidden; cursor:pointer;
  background:var(--card);
  transition:box-shadow .22s, transform .22s;
}
.faq-item:nth-child(2n){ background:#FBFDF9; }
.faq-item:hover{ box-shadow:5px 5px 0 var(--lemon); transform:translate(-2px,-2px); }

.faq-item .faq-question {
  padding:16px 20px; font-weight:600;
  display:flex; justify-content:space-between; align-items:center;
  gap:16px;
  font-size:1rem;
  transition:background .2s;
}
.faq-item .faq-question::after{
  content:"+";
  font-weight:700;
  font-size:1.3rem;
  line-height:1;
  color:var(--vermillion);
  flex:0 0 auto;
  transition:transform .25s;
}
.faq-item.open .faq-question{ background:var(--lemon); }
.faq-item.open .faq-question::after{ content:"−"; transform:rotate(180deg); color:var(--ink); }

.faq-item .faq-answer {
  padding:0 20px 16px; display:none; opacity:.7;
  font-size:.94rem;
  line-height:1.8;
  border-top:1px dashed var(--ink-12);
  padding-top:16px;
  color:var(--ink-70);
}
.faq-item.open .faq-answer { display:block; }

/* ---------- CTA横幅 ---------- */
.cta-banner {
  padding:56px 24px; text-align:center;
  border-radius:2px; color:#fff;
  background:linear-gradient(118deg, #E4572E 0%, #EE7A45 42%, #0E7C6F 100%);
  border:2px solid var(--ink);
  box-shadow:12px 12px 0 var(--mint);
  position:relative;
  overflow:hidden;
}
.cta-banner::after{
  content:"";
  position:absolute; inset:0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.14) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.14) 1px, transparent 1px);
  background-size:32px 32px;
  pointer-events:none;
}
.cta-banner h2 {
  color:#fff;
  font-size:2rem;
  letter-spacing:-.03em;
  margin-bottom:12px;
  position:relative;
}
.cta-banner p{ color:rgba(255,255,255,.85); max-width:520px; margin:0 auto 28px; position:relative; }
.cta-banner .btn-primary {
  background:#fff;
  color:var(--ink);
  border:1.5px solid var(--ink);
  box-shadow:4px 4px 0 var(--ink);
  position:relative;
}
.cta-banner .btn-primary:hover{
  background:var(--lemon);
  transform:translate(3px,3px);
  box-shadow:1px 1px 0 var(--ink);
}

/* ---------- 页脚 ---------- */
.site-footer {
  padding:56px 0 28px;
  background:var(--paper-mint);
  border-top:2px solid var(--ink);
  position:relative;
}
.site-footer::before{
  content:"";
  position:absolute; top:2px; left:0; width:100%; height:2px;
  background:repeating-linear-gradient(90deg,
    var(--vermillion) 0 18px, transparent 18px 32px);
  opacity:.85;
}
.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:.9rem; line-height:1.8; max-width:320px; color:var(--ink-55); }

.footer-col { }
.footer-col h4{
  font-size:.78rem; letter-spacing:.22em; text-transform:uppercase;
  color:var(--teal); margin-bottom:16px; font-weight:700;
}
.footer-col a{
  display:block;
  font-size:.9rem;
  color:var(--ink-55);
  text-decoration:none;
  padding:5px 0;
  transition:color .18s, transform .18s;
}
.footer-col a:hover{ color:var(--vermillion); transform:translateX(3px); }

.footer-bottom {
  border-top:1px solid var(--ink-12);
  margin-top:40px; padding-top:20px; text-align:center;
  font-size:.85rem;
  color:var(--ink-55);
  letter-spacing:.02em;
}

/* ---------- 工具类 ---------- */
.text-accent { color:var(--vermillion); }
.text-center { text-align:center; }
.seo-description { max-width:600px; margin:0 auto 48px; opacity:.7; line-height:1.8; color:var(--ink-70); }
.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px){
  .hero h1{ font-size:2.4rem; }
  .feature-block{ gap:36px; }
}

@media (max-width: 768px) {
  .section{ padding:60px 0; }
  .hero{ padding:calc(var(--nav-h) + 40px) 0 64px; min-height:auto; }
  .hero h1{ font-size:2rem; }
  .hero p{ font-size:1rem; }
  .hero::after{ display:none; }

  .feature-block { grid-template-columns:1fr; }
  .feature-image{ box-shadow:-8px 8px 0 var(--lemon); }
  .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;
    position:absolute; top:68px; left:0; width:100%;
    background:#fff; padding:20px;
    gap:16px;
    align-items:flex-start;
    border-bottom:2px solid var(--ink);
    box-shadow:0 12px 24px rgba(23,37,44,.12);
  }
  .main-nav.open a{ font-size:1rem; }
  .main-nav.open .nav-cta{ margin-top:8px; }
}

@media (max-width: 480px) {
  .container{ padding:0 18px; }
  .header-inner{ 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; }
  .hero h1{ font-size:1.75rem; }
  .section-title{ font-size:1.5rem; }
  .stat-number{ font-size:1.9rem; }
  .cta-banner{ padding:40px 18px; box-shadow:6px 6px 0 var(--mint); }
  .cta-banner h2{ font-size:1.5rem; }
}