/* ============================================================
   暗网爆料 · DESIGN SYSTEM
   Style: RISO EDITORIAL / 情报编辑部 硬边纸感排版
   Palette: 纸白 #F3F0E7 · 墨水 #14161C · 酸性黄绿 #D8FF3D
            朱砂橙 #FF4B2B · 克莱因蓝 #1B2AE0
   ============================================================ */

:root{
  --paper:#F3F0E7;
  --paper-2:#E9E5D8;
  --paper-3:#FBF9F3;
  --white:#FFFFFF;
  --ink:#14161C;
  --ink-soft:#5C5E68;
  --hair:#C7C2B1;
  --acid:#D8FF3D;
  --vermilion:#FF4B2B;
  --klein:#1B2AE0;
  --shadow-hard:8px 8px 0 var(--ink);
}

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

html{ scroll-behavior:smooth; }

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x:hidden;
  background-color:var(--paper);
  color:var(--ink);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  background-image:
    linear-gradient(rgba(20,22,28,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20,22,28,.045) 1px, transparent 1px);
  background-size:64px 64px;
  background-position:-1px -1px;
}

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

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

a{ color:inherit; }

:focus-visible{
  outline:2px dashed var(--vermilion);
  outline-offset:3px;
}

/* 滚动条 */
::-webkit-scrollbar{ width:10px; height:10px; }
::-webkit-scrollbar-track{ background:var(--paper-2); }
::-webkit-scrollbar-thumb{ background:var(--ink); border:2px solid var(--paper-2); }
::-webkit-scrollbar-thumb:hover{ background:var(--vermilion); }

/* ============ 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-3);
  border-top:1px solid var(--hair);
  border-bottom:1px solid var(--hair);
}

/* ============ 导航 ============ */
.site-header {
  position:fixed;
  top:0; left:0;
  width:100%;
  z-index:1000;
  background:rgba(243,240,231,.86);
  backdrop-filter:blur(14px) saturate(1.5);
  -webkit-backdrop-filter:blur(14px) saturate(1.5);
  border-bottom:1.5px 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:1.12rem;
  letter-spacing:-.02em;
  text-decoration:none;
  color:var(--ink);
}

.logo-icon {
  width:36px;
  height:36px;
  border-radius:2px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:.95rem;
  font-weight:900;
  background:var(--acid);
  border:1.5px solid var(--ink);
  box-shadow:3px 3px 0 var(--ink);
  transform:rotate(-6deg);
  transition:transform .25s cubic-bezier(.2,.8,.3,1);
}
.logo:hover .logo-icon{ transform:rotate(6deg) scale(1.05); }

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

.main-nav a {
  text-decoration:none;
  font-size:.88rem;
  font-weight:700;
  letter-spacing:.03em;
  color:var(--ink);
  position:relative;
  padding-bottom:3px;
  transition:color .2s;
}
.main-nav a::after{
  content:'';
  position:absolute;
  left:0; bottom:0;
  width:100%; height:2px;
  background:var(--vermilion);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .28s cubic-bezier(.2,.8,.3,1);
}
.main-nav a:hover{ color:var(--klein); }
.main-nav a:hover::after{ transform:scaleX(1); }

.nav-cta {
  padding:9px 22px;
  border-radius:2px;
  color:#fff!important;
  font-weight:800;
  background:var(--klein);
  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(--vermilion)!important;
  transform:translate(-2px,-2px);
  box-shadow:5px 5px 0 var(--ink);
}

.menu-toggle {
  display:none;
  width:44px;
  height:38px;
  align-items:center;
  justify-content:center;
  background:var(--acid);
  border:1.5px solid var(--ink);
  border-radius:2px;
  box-shadow:3px 3px 0 var(--ink);
  font-weight:900;
  font-size:1.1rem;
  cursor:pointer;
}

/* ============ 首页 Hero ============ */
.hero {
  min-height:70vh;
  display:flex;
  align-items:center;
  position:relative;
  padding-top:140px;
  padding-bottom:90px;
  overflow:hidden;
}

.hero::before{
  content:'';
  position:absolute;
  top:-14%; right:-8%;
  width:min(560px,70vw);
  height:min(560px,70vw);
  background:radial-gradient(circle at 35% 35%, rgba(216,255,61,.85), rgba(216,255,61,0) 65%);
  border-radius:50%;
  filter:blur(6px);
  pointer-events:none;
}

.hero::after{
  content:'';
  position:absolute;
  left:-120px; bottom:-140px;
  width:340px; height:340px;
  border-radius:50%;
  border:1.5px dashed var(--klein);
  opacity:.45;
  pointer-events:none;
}

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

.hero-eyebrow {
  display:inline-block;
  font-size:.74rem;
  font-weight:900;
  letter-spacing:.22em;
  text-transform:uppercase;
  padding:6px 16px;
  border-radius:100px;
  margin-bottom:22px;
  background:var(--acid);
  border:1.5px solid var(--ink);
  box-shadow:3px 3px 0 var(--ink);
}

.hero h1 {
  font-size:clamp(2.5rem, 5.6vw, 4rem);
  line-height:1.14;
  letter-spacing:-.025em;
  font-weight:900;
  margin-bottom:24px;
}

.hero p {
  font-size:1.06rem;
  color:var(--ink-soft);
  max-width:560px;
  margin-bottom:36px;
  line-height:1.9;
}

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

.hero-image {
  border-radius:2px;
  overflow:hidden;
  border:1.5px solid var(--ink);
  box-shadow:12px 12px 0 var(--acid);
}

.hero-image img {
  width:100%;
  height:auto;
}

/* ============ 按钮 ============ */
.btn {
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:14px 30px;
  border-radius:2px;
  font-weight:800;
  font-size:.94rem;
  letter-spacing:.04em;
  cursor:pointer;
  text-decoration:none;
  border:1.5px solid var(--ink);
  transition:transform .18s cubic-bezier(.2,.8,.3,1), box-shadow .18s, background .18s, color .18s;
}

.btn-primary {
  color:#fff;
  background:var(--ink);
  box-shadow:4px 4px 0 var(--vermilion);
}
.btn-primary:hover{
  transform:translate(-3px,-3px);
  box-shadow:8px 8px 0 var(--vermilion);
}

.btn-outline {
  background:transparent;
  color:var(--ink);
  box-shadow:4px 4px 0 var(--hair);
}
.btn-outline:hover{
  background:var(--acid);
  transform:translate(-3px,-3px);
  box-shadow:8px 8px 0 var(--ink);
}

/* ============ 标签 / 标题 ============ */
.section-label {
  display:inline-block;
  font-size:.74rem;
  font-weight:900;
  letter-spacing:.28em;
  text-transform:uppercase;
  margin-bottom:14px;
  color:var(--klein);
}
.section-label::before{
  content:'▍';
  color:var(--vermilion);
  margin-right:6px;
}

.section-title {
  font-size:clamp(1.7rem, 3.4vw, 2.5rem);
  font-weight:900;
  letter-spacing:-.025em;
  line-height:1.24;
  margin-bottom:16px;
}

.section-desc {
  max-width:600px;
  color:var(--ink-soft);
  line-height:1.85;
  margin-bottom:44px;
}

/* ============ 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:2px;
  padding:28px;
  background:var(--white);
  border:1.5px solid var(--ink);
  overflow:hidden;
  transition:transform .22s cubic-bezier(.2,.8,.3,1), box-shadow .22s, background .22s;
}
.category-card::before{
  content:'';
  position:absolute;
  top:0; left:0;
  width:100%; height:5px;
  background:var(--acid);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .32s cubic-bezier(.2,.8,.3,1);
}
.category-card:hover {
  transform:translate(-3px,-3px);
  box-shadow:8px 8px 0 var(--ink);
  background:var(--white);
}
.category-card:hover::before{ transform:scaleX(1); }

.card-icon {
  width:48px;
  height:48px;
  border-radius:2px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:18px;
  font-size:1.3rem;
  background:var(--acid);
  border:1.5px solid var(--ink);
}

.card-link {
  font-weight:900;
  font-size:.78rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  text-decoration:none;
  color:var(--klein);
  display:inline-block;
  transition:color .2s, transform .2s;
}
.card-link::after{
  content:' →';
  transition:margin .2s;
}
.card-link:hover{ color:var(--vermilion); }

/* ============ 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:1.5px solid var(--ink);
  box-shadow:12px 12px 0 rgba(27,42,224,.14);
}

.feature-image img {
  width:100%;
  height:auto;
}

.feature-text .section-title{ margin-bottom:14px; }

.feature-text p{
  color:var(--ink-soft);
  line-height:1.85;
  margin-bottom:22px;
}

.feature-list {
  list-style:none;
}

.feature-list li {
  padding:10px 0;
  display:flex;
  align-items:center;
  gap:12px;
  font-weight:600;
  font-size:.95rem;
  border-bottom:1px dashed var(--hair);
}
.feature-list li:last-child{ border-bottom:none; }

.feature-list li::before {
  content:'✓';
  flex:none;
  width:22px;
  height:22px;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  background:var(--acid);
  border:1.5px solid var(--ink);
  font-size:.7rem;
  font-weight:900;
  color:var(--ink);
  line-height:1;
}

/* ============ 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:2px;
  background:var(--white);
  border:1.5px solid var(--ink);
  transition:transform .22s cubic-bezier(.2,.8,.3,1), box-shadow .22s;
}
.stat-item:nth-child(2n){
  background:var(--acid);
}
.stat-item:hover{
  transform:translate(-3px,-3px);
  box-shadow:8px 8px 0 var(--klein);
}

.stat-number {
  font-size:clamp(1.9rem, 3.6vw, 2.5rem);
  font-weight:900;
  letter-spacing:-.03em;
  line-height:1.1;
  font-variant-numeric:tabular-nums;
}

.stat-label {
  font-size:.78rem;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--ink-soft);
  margin-top:10px;
}

/* ============ 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;
  background:var(--white);
  border:1.5px solid var(--ink);
  transition:transform .22s cubic-bezier(.2,.8,.3,1), box-shadow .22s;
}
.content-wall-item:hover {
  transform:translate(-3px,-3px);
  box-shadow:8px 8px 0 var(--vermilion);
}

.content-wall-item img {
  width:100%;
  height:200px;
  object-fit:cover;
  filter:grayscale(1) contrast(1.08);
  transition:filter .35s ease, transform .5s ease;
}
.content-wall-item:hover img{
  filter:grayscale(0) contrast(1);
  transform:scale(1.03);
}

.content-wall-body {
  padding:22px;
  border-top:1px solid var(--hair);
}

.content-wall-body h3{
  font-size:1.04rem;
  font-weight:900;
  letter-spacing:-.01em;
  margin-bottom:8px;
}

.content-wall-body p{
  font-size:.9rem;
  color:var(--ink-soft);
  line-height:1.75;
}

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

.faq-item {
  background:var(--white);
  border:1.5px solid var(--ink);
  border-radius:2px;
  margin-bottom:10px;
  overflow:hidden;
  cursor:pointer;
  transition:box-shadow .22s, transform .22s;
}
.faq-item:hover{
  transform:translate(-2px,-2px);
  box-shadow:5px 5px 0 var(--hair);
}

.faq-item .faq-question {
  padding:18px 22px;
  font-weight:800;
  font-size:.98rem;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
}
.faq-item .faq-question::after{
  content:'+';
  flex:none;
  font-size:1.35rem;
  font-weight:900;
  line-height:1;
  color:var(--vermilion);
  transition:transform .28s cubic-bezier(.2,.8,.3,1);
}

.faq-item .faq-answer {
  padding:0 22px 18px;
  display:none;
  color:var(--ink-soft);
  line-height:1.85;
  font-size:.94rem;
}

.faq-item.open {
  background:var(--white);
  box-shadow:6px 6px 0 var(--paper-2);
  border-left:6px solid var(--acid);
}
.faq-item.open .faq-question::after{ transform:rotate(45deg); }
.faq-item.open .faq-answer { display:block; }

/* ============ CTA 横幅 ============ */
.cta-banner {
  padding:64px 28px;
  text-align:center;
  border-radius:2px;
  color:var(--ink);
  background:var(--acid);
  border:1.5px solid var(--ink);
  box-shadow:14px 14px 0 var(--ink);
  position:relative;
  overflow:hidden;
}
.cta-banner::before{
  content:'';
  position:absolute;
  top:-70px; left:-70px;
  width:220px; height:220px;
  border-radius:50%;
  border:1.5px dashed rgba(20,22,28,.35);
}

.cta-banner h2 {
  color:var(--ink);
  font-size:clamp(1.6rem, 3vw, 2.3rem);
  font-weight:900;
  letter-spacing:-.025em;
  margin-bottom:14px;
}

.cta-banner p{
  max-width:540px;
  margin:0 auto 32px;
  color:rgba(20,22,28,.72);
  line-height:1.85;
}

.cta-banner .btn-primary {
  background:var(--ink);
  color:#fff;
  box-shadow:5px 5px 0 #fff;
}
.cta-banner .btn-primary:hover{
  transform:translate(-3px,-3px);
  box-shadow:9px 9px 0 #fff;
  background:var(--vermilion);
}

.cta-banner .btn-outline{
  background:#fff;
  box-shadow:5px 5px 0 var(--ink);
}

/* ============ 页脚 ============ */
.site-footer {
  padding:64px 0 28px;
  background:var(--paper-2);
  border-top:1.5px solid var(--ink);
}

.site-footer .container { position:relative; }

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

.footer-brand .logo{ margin-bottom:16px; }

.footer-brand p{
  font-size:.9rem;
  color:var(--ink-soft);
  line-height:1.85;
  max-width:320px;
}

.footer-col h4{
  font-size:.76rem;
  font-weight:900;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--klein);
  margin-bottom:16px;
}

.footer-col a{
  display:block;
  text-decoration:none;
  font-size:.88rem;
  font-weight:500;
  color:var(--ink-soft);
  padding:5px 0;
  transition:color .2s, transform .2s;
}
.footer-col a:hover{
  color:var(--vermilion);
  transform:translateX(5px);
}

.footer-bottom {
  border-top:1px solid var(--hair);
  margin-top:44px;
  padding-top:22px;
  text-align:center;
  font-size:.82rem;
  letter-spacing:.05em;
  color:var(--ink-soft);
}

/* ============ 工具类 ============ */
.text-accent {
  color:var(--ink);
  background-image:linear-gradient(var(--acid), var(--acid));
  background-repeat:no-repeat;
  background-size:100% .38em;
  background-position:0 84%;
  padding:0 .08em;
}

.text-center { text-align:center; }

.seo-description {
  max-width:600px;
  margin:0 auto 48px;
  color:var(--ink-soft);
  line-height:1.9;
}

.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* ============ 响应式 ============ */
@media (max-width: 1024px){
  .hero{ padding-top:120px; }
  .hero h1{ font-size:clamp(2.2rem, 6vw, 3.2rem); }
}

@media (max-width: 768px) {
  .section{ padding:60px 0; }

  .feature-block { grid-template-columns:1fr; gap:36px; }
  .feature-image{ box-shadow:9px 9px 0 rgba(27,42,224,.14); }

  .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;
    gap:6px;
    position:absolute;
    top:68px;
    left:0;
    width:100%;
    background:var(--paper);
    border-bottom:1.5px solid var(--ink);
    padding:20px 24px 26px;
  }
  .main-nav.open a{
    width:100%;
    padding:12px 0;
    border-bottom:1px dashed var(--hair);
    font-size:.95rem;
  }
  .main-nav.open .nav-cta{
    width:auto;
    margin-top:14px;
    border-bottom:1.5px solid var(--ink);
    padding:10px 22px;
  }

  .hero{ padding-top:110px; padding-bottom:70px; min-height:auto; }
  .hero::before{ opacity:.7; }

  .cta-banner{ box-shadow:8px 8px 0 var(--ink); padding:48px 22px; }
}

@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:2rem; }
  .section-title{ font-size:1.55rem; }

  .category-card,
  .content-wall-body { padding:22px; }

  .cta-banner{ box-shadow:6px 6px 0 var(--ink); }
}