/* ============================================================
   黑料暗网 · 风险监测  —  设计系统
   风格：酸色编辑网格 / Signal Editorial Grid
   底色：暖纸白  ·  强调：信号品红 + 酸性青柠
   ============================================================ */

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

:root{
  --paper:#faf8f3;
  --paper-2:#f2efe6;
  --ink:#14161f;
  --ink-soft:#5a5d6b;
  --signal:#ff3b5c;
  --acid:#d7ff3f;
  --violet:#5b46f5;
  --line:rgba(20,22,31,.12);
  --mono: ui-monospace, 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;
}

html{ scroll-behavior:smooth; }

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x:hidden;
  background-color:var(--paper);
  background-image:
    linear-gradient(rgba(20,22,31,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20,22,31,.035) 1px, transparent 1px);
  background-size:56px 56px;
  color:var(--ink);
  line-height:1.68;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

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

/* ===================== 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:#f2efe6;
  background-image:repeating-linear-gradient(
    -45deg,
    rgba(20,22,31,.03) 0 1px,
    transparent 1px 14px
  );
}

/* ===================== 导航 ===================== */
.site-header {
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  background:rgba(250,248,243,.88);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}

.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:800; font-size:1.05rem; letter-spacing:-.03em;
  text-decoration:none; color:inherit; white-space:nowrap;
}

.logo-icon {
  width:36px; height:36px; border-radius:6px;
  display:flex; align-items:center; justify-content:center;
  font-size:1rem; font-weight:900;
  background:var(--acid); color:var(--ink);
  border:1.5px solid var(--ink);
  box-shadow:3px 3px 0 rgba(20,22,31,.9);
  transition:transform .25s ease, box-shadow .25s ease;
}
.logo:hover .logo-icon{ transform:translate(1px,1px); box-shadow:1px 1px 0 rgba(20,22,31,.9); }

.main-nav { display:flex; align-items:center; gap:26px; list-style:none; }

.main-nav a {
  position:relative;
  text-decoration:none; font-size:.9rem; font-weight:600;
  color:var(--ink); padding:4px 0;
  transition:color .25s ease;
}
.main-nav a::after{
  content:''; position:absolute; left:0; bottom:0;
  width:0; height:2px; background:var(--signal);
  transition:width .3s cubic-bezier(.2,.8,.3,1);
}
.main-nav a:hover{ color:var(--signal); }
.main-nav a:hover::after{ width:100%; }

.nav-cta {
  padding:9px 20px; border-radius:100px;
  background:var(--ink); color:#faf8f3 !important;
  font-weight:700; border:1.5px solid var(--ink);
  transition:background .25s ease, color .25s ease, transform .25s ease;
}
.nav-cta::after{ display:none; }
.nav-cta:hover{
  background:var(--acid) !important; color:var(--ink) !important;
  transform:translateY(-1px);
}

.menu-toggle {
  display:none; width:42px; height:38px; align-items:center; justify-content:center;
  background:var(--ink); color:var(--paper); border:none; border-radius:8px;
  font-size:1rem; cursor:pointer;
}

/* ===================== Hero ===================== */
.hero {
  min-height:70vh; display:flex; align-items:center;
  padding:150px 0 90px; position:relative; overflow:hidden;
}

.hero::before{
  content:''; position:absolute;
  width:620px; height:620px; right:-140px; top:-120px; border-radius:50%;
  background:radial-gradient(circle at 32% 32%,
      rgba(215,255,63,.75),
      rgba(255,59,92,.18) 52%,
      rgba(91,70,245,.10) 68%,
      transparent 74%);
  filter:blur(14px);
  pointer-events:none;
}

.hero::after{
  content:''; position:absolute; left:0; bottom:0; width:100%; height:1px;
  background:linear-gradient(90deg, transparent, var(--line) 20%, var(--line) 80%, transparent);
}

.hero-content { max-width:760px; position:relative; z-index:2; }

.hero-eyebrow {
  display:inline-flex; align-items:center; gap:9px;
  font-family:var(--mono);
  font-size:.7rem; font-weight:700; letter-spacing:.2em; text-transform:uppercase;
  padding:6px 15px 6px 12px; border-radius:100px;
  background:var(--acid); color:var(--ink);
  border:1px solid var(--ink);
  margin-bottom:22px;
}
.hero-eyebrow::before{
  content:''; width:7px; height:7px; border-radius:50%;
  background:var(--signal);
  box-shadow:0 0 0 3px rgba(255,59,92,.22);
}

.hero h1 {
  font-size:clamp(2.1rem, 5.2vw, 3.55rem);
  line-height:1.12; letter-spacing:-.035em; font-weight:900;
  margin-bottom:22px;
}
.hero h1 em{
  font-style:normal;
  background:linear-gradient(transparent 60%, rgba(215,255,63,.95) 60%);
  padding:0 .06em;
}

.hero p {
  font-size:1.08rem; color:var(--ink-soft);
  max-width:580px; margin-bottom:34px;
}

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

.hero-image {
  border-radius:18px; overflow:hidden;
  border:1px solid var(--line);
  background:#fff;
  box-shadow:0 30px 70px -40px rgba(20,22,31,.5);
}
.hero-image img { width:100%; height:auto; display:block; }

/* ===================== 按钮 ===================== */
.btn {
  display:inline-flex; align-items:center; gap:9px;
  padding:14px 30px; border-radius:100px;
  font-size:.95rem; font-weight:700; letter-spacing:.01em;
  cursor:pointer; border:none; text-decoration:none;
  transition:transform .25s cubic-bezier(.2,.8,.3,1),
             box-shadow .25s ease, background .25s ease, color .25s ease;
}

.btn-primary {
  background:var(--signal); color:#fff;
  box-shadow:0 14px 30px -12px rgba(255,59,92,.75);
}
.btn-primary:hover{
  transform:translateY(-3px);
  box-shadow:0 20px 38px -14px rgba(255,59,92,.85);
}

.btn-outline {
  background:transparent; border:1.5px solid var(--ink); color:var(--ink);
}
.btn-outline:hover{ background:var(--ink); color:var(--paper); transform:translateY(-3px); }

/* ===================== 标签 / 标题 ===================== */
.section-label {
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--mono);
  font-size:.7rem; font-weight:700; letter-spacing:.24em; text-transform:uppercase;
  color:var(--signal); margin-bottom:14px;
}
.section-label::before{
  content:''; display:inline-block; width:22px; height:2px; background:var(--signal);
}

.section-title {
  font-size:clamp(1.6rem, 3vw, 2.3rem);
  line-height:1.2; letter-spacing:-.03em; font-weight:850;
  margin-bottom:14px;
}

.section-desc {
  max-width:600px; color:var(--ink-soft); margin-bottom:40px; font-size:1rem;
}

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

.category-card {
  position:relative;
  border-radius:18px; padding:30px 28px;
  background:#fff; border:1px solid var(--line);
  transition:transform .3s cubic-bezier(.2,.8,.3,1),
             border-color .3s ease, box-shadow .3s ease;
}
.category-card::after{
  content:''; position:absolute; left:28px; bottom:0;
  width:0; height:3px; background:var(--signal);
  transition:width .35s cubic-bezier(.2,.8,.3,1);
}
.category-card:hover {
  transform:translateY(-5px);
  border-color:var(--ink);
  box-shadow:7px 7px 0 rgba(215,255,63,.95);
}
.category-card:hover::after{ width:calc(100% - 56px); }

.card-icon {
  width:48px; height:48px; border-radius:12px;
  display:flex; align-items:center; justify-content:center;
  margin-bottom:18px; font-size:1.25rem;
  background:rgba(20,22,31,.05);
  border:1px solid var(--line);
}

.card-link {
  display:inline-flex; align-items:center; gap:6px;
  font-size:.83rem; font-weight:700; text-decoration:none;
  color:var(--signal); letter-spacing:.02em;
}
.card-link::after{ content:'→'; transition:transform .25s ease; }
.category-card:hover .card-link::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:18px; overflow:hidden;
  border:1px solid var(--line); background:#fff;
  box-shadow:0 26px 60px -40px rgba(20,22,31,.55);
}
.feature-image img { width:100%; height:auto; display:block; }

.feature-text { position:relative; }

.feature-list { list-style:none; margin-top:22px; }
.feature-list li {
  padding:9px 0; display:flex; align-items:flex-start; gap:10px;
  color:var(--ink-soft); font-size:.97rem;
  border-bottom:1px dashed var(--line);
}
.feature-list li:last-child{ border-bottom:none; }
.feature-list li::before {
  content:'✓'; font-weight:800; flex-shrink:0;
  width:20px; height:20px; margin-top:3px;
  display:inline-flex; align-items:center; justify-content:center;
  font-size:.7rem; border-radius:50%;
  background:var(--acid); color:var(--ink);
}

/* ===================== 数据条 ===================== */
.stats-bar {
  display:grid; grid-template-columns:repeat(4, 1fr);
  gap:20px; text-align:center;
}

.stat-item {
  padding:28px 18px; border-radius:18px;
  background:#fff; border:1px solid var(--line);
  transition:transform .3s ease, background .3s ease;
}
.stat-item:hover{ transform:translateY(-4px); background:rgba(215,255,63,.16); }

.stat-number {
  font-family:var(--mono);
  font-size:clamp(1.7rem, 3.4vw, 2.3rem);
  font-weight:800; letter-spacing:-.04em; line-height:1;
  color:var(--ink);
}
.stat-number span{ color:var(--signal); }

.stat-label {
  font-size:.85rem; color:var(--ink-soft); margin-top:10px;
  letter-spacing:.04em;
}

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

.content-wall-item {
  border-radius:18px; overflow:hidden;
  background:#fff; border:1px solid var(--line);
  transition:transform .3s cubic-bezier(.2,.8,.3,1),
             border-color .3s ease, box-shadow .3s ease;
}
.content-wall-item:hover {
  transform:translateY(-5px);
  border-color:var(--ink);
  box-shadow:7px 7px 0 rgba(255,59,92,.9);
}

.content-wall-item img {
  width:100%; height:200px; object-fit:cover; display:block;
  filter:saturate(.9);
  transition:transform .5s cubic-bezier(.2,.8,.3,1);
}
.content-wall-item:hover img{ transform:scale(1.04); }

.content-wall-body { padding:22px; }
.content-wall-body h3{
  font-size:1.05rem; font-weight:750; letter-spacing:-.02em; 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:#fff; border:1px solid var(--line);
  border-radius:14px; margin-bottom:10px;
  overflow:hidden; cursor:pointer;
  transition:border-color .25s ease, box-shadow .25s ease;
}
.faq-item:hover{ border-color:rgba(20,22,31,.35); }
.faq-item.open{ border-color:var(--ink); box-shadow:5px 5px 0 rgba(215,255,63,.9); }

.faq-item .faq-question {
  padding:18px 22px; font-weight:700; font-size:.98rem;
  display:flex; justify-content:space-between; align-items:center; gap:16px;
}
.faq-item .faq-question::after{
  content:'+'; flex-shrink:0;
  font-family:var(--mono); font-size:1.2rem; font-weight:700;
  color:var(--signal); line-height:1;
  transition:transform .3s ease;
}
.faq-item.open .faq-question::after{ content:'−'; transform:rotate(180deg); }

.faq-item .faq-answer {
  padding:0 22px 18px; display:none;
  color:var(--ink-soft); font-size:.93rem;
}
.faq-item.open .faq-answer { display:block; animation:fadeUp .3s ease both; }

@keyframes fadeUp{
  from{ opacity:0; transform:translateY(-6px); }
  to{ opacity:1; transform:translateY(0); }
}

/* ===================== CTA 横幅 ===================== */
.cta-banner {
  position:relative; overflow:hidden;
  padding:64px 32px; text-align:center; border-radius:26px;
  background:var(--acid);
  border:1.5px solid var(--ink);
  box-shadow:10px 10px 0 rgba(20,22,31,.92);
}
.cta-banner::before{
  content:''; position:absolute; inset:0;
  background-image:repeating-linear-gradient(
    -45deg, rgba(20,22,31,.06) 0 1px, transparent 1px 16px);
  pointer-events:none;
}
.cta-banner > *{ position:relative; z-index:1; }

.cta-banner h2 {
  color:var(--ink); font-size:clamp(1.5rem, 3vw, 2.2rem);
  font-weight:900; letter-spacing:-.035em; line-height:1.18; margin-bottom:12px;
}
.cta-banner p{ color:rgba(20,22,31,.7); max-width:520px; margin:0 auto 30px; }

.cta-banner .btn-primary {
  background:var(--ink); color:#fff;
  box-shadow:0 14px 30px -14px rgba(20,22,31,.9);
}
.cta-banner .btn-primary:hover{ background:#000; }

/* ===================== 页脚 ===================== */
.site-footer {
  padding:64px 0 28px;
  background:#f2efe6;
  border-top:1px solid var(--line);
}

.footer-grid {
  display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:40px;
}

.footer-brand .logo{ margin-bottom:16px; }
.footer-brand p{ color:var(--ink-soft); font-size:.9rem; max-width:320px; }

.footer-col h4{
  font-family:var(--mono);
  font-size:.72rem; font-weight:700; letter-spacing:.2em; text-transform:uppercase;
  color:var(--ink); margin-bottom:16px;
}
.footer-col ul{ list-style:none; }
.footer-col li{ margin-bottom:10px; }
.footer-col a{
  color:var(--ink-soft); text-decoration:none; font-size:.9rem;
  transition:color .22s ease, padding-left .22s ease;
}
.footer-col a:hover{ color:var(--signal); padding-left:5px; }

.footer-bottom {
  border-top:1px solid var(--line);
  margin-top:48px; padding-top:22px; text-align:center;
  font-size:.82rem; color:var(--ink-soft);
  font-family:var(--mono); letter-spacing:.04em;
}

/* ===================== 工具类 ===================== */
.text-accent { color:var(--signal); }
.text-center { text-align:center; }
.seo-description {
  max-width:600px; margin:0 auto 48px;
  color:var(--ink-soft); font-size:.95rem;
}
.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* ===================== 响应式 ===================== */
@media (max-width: 900px){
  .feature-block { gap:36px; }
  .stats-bar { grid-template-columns:repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .section{ padding:60px 0; }
  .hero{ padding:120px 0 70px; min-height:auto; }
  .feature-block { grid-template-columns:1fr; }
  .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);
    padding:24px;
    gap:20px;
    border-bottom:1px solid var(--line);
    box-shadow:0 24px 40px -30px rgba(20,22,31,.5);
  }
  .main-nav.open a{ font-size:1rem; }
  .main-nav.open .nav-cta{ align-self:stretch; text-align:center; justify-content:center; }
}

@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; }
  .cta-banner{ padding:44px 22px; border-radius:20px; box-shadow:6px 6px 0 rgba(20,22,31,.92); }
}