/* ============================================================
   黑料社区官网 · 设计系统
   风格:档案纸张 × 编辑排版 × 硬边新粗野
   背景:米纸白 / 荧光柠檬 / 橘红钢印
   ============================================================ */

:root{
  --paper:      #FAF7EF;
  --paper-2:    #F1EADC;
  --paper-3:    #E7DDC9;
  --ink:        #17150F;
  --ink-mid:    rgba(23,21,15,.66);
  --ink-soft:   rgba(23,21,15,.42);
  --line:       rgba(23,21,15,.14);
  --line-hard:  rgba(23,21,15,.85);
  --accent:     #FF4A1C;   /* 钢印橘红 */
  --lime:       #DCF24B;   /* 荧光柠檬 */
  --teal:       #0E6E63;   /* 深松绿 */
  --hard:       6px 6px 0 var(--ink);
  --hard-sm:    4px 4px 0 var(--ink);
  --r:          2px;       /* 硬边圆角 */
  --ease:       cubic-bezier(.2,.7,.3,1);
}

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

html{
  scroll-behavior:smooth;
  scroll-padding-top:88px;
  -webkit-text-size-adjust:100%;
}

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x:hidden;
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    linear-gradient(rgba(23,21,15,.038) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23,21,15,.038) 1px, transparent 1px);
  background-size:28px 28px;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

img{ display:block; max-width:100%; }
a{ color:inherit; }
button{ font:inherit; }

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

:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
}

::-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(--accent); }

/* ---------- 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-2);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}

/* ---------- 导航 ---------- */
.site-header {
  position:fixed; top:0; left:0; width:100%; z-index:1000;
  background:rgba(250,247,239,.88);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line);
}
.site-header::after{
  content:'';
  position:absolute; left:0; bottom:-1px; height:2px; width:72px;
  background:var(--accent);
}

.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:1.15rem; letter-spacing:-.02em;
  text-decoration:none; color:inherit;
}
.logo-icon {
  width:36px; height:36px; border-radius:var(--r);
  display:flex; align-items:center; justify-content:center;
  font-size:1rem; font-weight:900; color:#fff;
  background:var(--accent);
  box-shadow:3px 3px 0 var(--ink);
  transform:rotate(-5deg);
  transition:transform .3s var(--ease);
}
.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 {
  position:relative;
  text-decoration:none; font-size:.9rem; font-weight:600;
  color:var(--ink-mid);
  transition:color .2s var(--ease);
  padding-bottom:2px;
}
.main-nav a::after{
  content:''; position:absolute; left:0; bottom:-4px; height:2px; width:0;
  background:var(--accent); transition:width .28s var(--ease);
}
.main-nav a:hover{ color:var(--ink); }
.main-nav a:hover::after{ width:100%; }

.nav-cta {
  padding:9px 22px; border-radius:var(--r);
  color:#fff!important; font-weight:700; font-size:.85rem;
  background:var(--ink);
  box-shadow:3px 3px 0 var(--accent);
  transition:transform .2s var(--ease), box-shadow .2s var(--ease);
}
.nav-cta::after{ display:none; }
.nav-cta:hover{
  transform:translate(-2px,-2px);
  box-shadow:5px 5px 0 var(--accent);
}

.menu-toggle {
  display:none;
  width:42px; height:42px; align-items:center; justify-content:center;
  background:transparent; border:1.5px solid var(--line-hard);
  border-radius:var(--r); cursor:pointer; color:var(--ink);
}

/* ---------- 首页 Hero ---------- */
.hero {
  min-height:70vh; display:flex; align-items:center;
  padding:150px 0 90px;
  position:relative; overflow:hidden;
}
.hero::before{
  content:''; position:absolute; z-index:0;
  width:520px; height:520px; right:-140px; top:-90px;
  background:radial-gradient(circle at 40% 40%, var(--lime) 0%, rgba(220,242,75,0) 68%);
  filter:blur(6px); opacity:.85; pointer-events:none;
}
.hero::after{
  content:''; position:absolute; z-index:0;
  width:180px; height:180px; right:12%; bottom:-40px;
  border:2px solid var(--accent); border-radius:var(--r);
  transform:rotate(14deg); opacity:.5; pointer-events:none;
}
.hero .container{ position:relative; z-index:1; }

.hero-content { max-width:760px; }

.hero-eyebrow {
  display:inline-block;
  font-size:.72rem; font-weight:800; letter-spacing:.22em;
  text-transform:uppercase;
  padding:6px 16px; border-radius:999px;
  background:var(--lime); color:var(--ink);
  border:1.5px solid var(--ink);
  margin-bottom:22px;
}

.hero h1 {
  font-size:clamp(2.35rem, 6vw, 4.1rem);
  line-height:1.05;
  font-weight:900;
  letter-spacing:-.035em;
  margin-bottom:24px;
}
.hero h1 em{
  font-style:normal;
  color:var(--accent);
  box-shadow:inset 0 -.18em 0 var(--lime);
}

.hero p {
  font-size:1.08rem; line-height:1.85;
  color:var(--ink-mid);
  max-width:560px; margin-bottom:36px;
}

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

.hero-image {
  border-radius:var(--r); overflow:hidden;
  border:1.5px solid var(--line-hard);
  box-shadow:10px 10px 0 var(--lime);
}
.hero-image img { width:100%; height:auto; }

/* ---------- 按钮 ---------- */
.btn {
  display:inline-flex; align-items:center; gap:10px;
  padding:14px 30px; border-radius:var(--r);
  font-weight:800; font-size:.94rem; letter-spacing:.01em;
  cursor:pointer; border:none; text-decoration:none;
  transition:transform .2s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease), color .2s var(--ease);
}
.btn-primary { color:#fff; background:var(--accent); box-shadow:var(--hard-sm); }
.btn-primary:hover { transform:translate(-3px,-3px); box-shadow:var(--hard); }

.btn-outline {
  background:transparent;
  border:2px solid var(--line-hard);
  color:var(--ink);
}
.btn-outline:hover {
  background:var(--ink); color:var(--paper);
  transform:translate(-3px,-3px);
  box-shadow:6px 6px 0 var(--lime);
}

/* ---------- 标题 / 标签 ---------- */
.section-label {
  display:inline-flex; align-items:center; gap:10px;
  font-size:.72rem; font-weight:800;
  letter-spacing:.26em; text-transform:uppercase;
  color:var(--teal);
  margin-bottom:14px;
}
.section-label::before{
  content:''; width:26px; height:2px; background:var(--accent); display:inline-block;
}

.section-title {
  font-size:clamp(1.7rem, 3.4vw, 2.5rem);
  font-weight:900; letter-spacing:-.03em; line-height:1.18;
  margin-bottom:16px;
}
.section-title::after{
  content:''; display:block; width:56px; height:6px;
  background:var(--lime); margin-top:14px;
  border:1px solid var(--ink);
}

.section-desc {
  max-width:620px; color:var(--ink-mid); font-size:1rem; 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:22px;
}
.category-card {
  position:relative; overflow:hidden;
  border-radius:var(--r);
  padding:30px 28px;
  background:#fff;
  border:1px solid var(--line);
  transition:transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}
.category-card::before{
  content:''; position:absolute; top:0; left:0; height:4px; width:100%;
  background:var(--accent); transform:scaleX(0); transform-origin:left;
  transition:transform .35s var(--ease);
}
.category-card:nth-child(2n)::before{ background:var(--teal); }
.category-card:nth-child(3n)::before{ background:var(--lime); }
.category-card:hover {
  transform:translate(-5px,-5px);
  box-shadow:var(--hard);
  border-color:var(--line-hard);
}
.category-card:hover::before{ transform:scaleX(1); }

.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(--paper-3); color:var(--ink);
  border:1px solid var(--line);
}
.category-card:nth-child(3n+1) .card-icon{ background:var(--lime); border-color:var(--ink); }
.category-card:nth-child(3n+2) .card-icon{ background:#FFE1D6; border-color:var(--accent); }
.category-card:nth-child(3n+3) .card-icon{ background:#D8EAE7; border-color:var(--teal); }

.category-card h3{ font-size:1.12rem; font-weight:800; letter-spacing:-.02em; margin-bottom:10px; }
.category-card p{ color:var(--ink-mid); font-size:.92rem; line-height:1.75; margin-bottom:18px; }

.card-link {
  display:inline-flex; align-items:center; gap:6px;
  font-weight:800; font-size:.82rem; letter-spacing:.04em;
  text-decoration:none; color:var(--accent);
  transition:gap .2s var(--ease), color .2s var(--ease);
}
.card-link::after{ content:'→'; transition:transform .2s var(--ease); }
.card-link:hover{ color:var(--ink); }
.card-link:hover::after{ transform:translateX(4px); }

/* ---------- 特性块 ---------- */
.feature-block {
  display:grid; grid-template-columns:1fr 1fr;
  gap:60px; align-items:center;
}
.feature-image {
  border-radius:var(--r); overflow:hidden;
  border:1.5px solid var(--line-hard);
  box-shadow:12px 12px 0 var(--lime);
}
.feature-image img { width:100%; height:auto; }

.feature-text h3{
  font-size:clamp(1.4rem,2.4vw,1.9rem); font-weight:900;
  letter-spacing:-.025em; line-height:1.2; margin-bottom:16px;
}
.feature-text p{ color:var(--ink-mid); line-height:1.85; margin-bottom:20px; }

.feature-list { list-style:none; }
.feature-list li {
  padding:9px 0;
  display:flex; align-items:flex-start; gap:12px;
  color:var(--ink-mid); font-size:.95rem;
  border-bottom:1px dashed var(--line);
}
.feature-list li::before {
  content:'✓';
  flex:0 0 auto;
  width:20px; height:20px; margin-top:2px;
  display:flex; align-items:center; justify-content:center;
  font-weight:900; font-size:.68rem; color:#fff;
  background:var(--teal); border-radius:var(--r);
}

/* ---------- 数据条 ---------- */
.stats-bar {
  display:grid; grid-template-columns:repeat(4,1fr);
  gap:20px; text-align:center;
}
.stat-item {
  padding:32px 18px;
  border-radius:var(--r);
  border:1px solid var(--line);
  background:#fff;
  transition:transform .22s var(--ease), box-shadow .22s var(--ease);
}
.stat-item:hover{
  transform:translateY(-5px);
  box-shadow:var(--hard-sm);
}
.stat-number {
  font-size:clamp(1.9rem, 3.6vw, 2.6rem);
  font-weight:900; letter-spacing:-.04em;
  font-variant-numeric:tabular-nums;
  line-height:1.1;
  color:var(--ink);
}
.stat-item:nth-child(1) .stat-number{ color:var(--accent); }
.stat-item:nth-child(3) .stat-number{ color:var(--teal); }

.stat-label {
  font-size:.74rem; font-weight:700;
  letter-spacing:.18em; 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:var(--r); overflow:hidden;
  border:1px solid var(--line);
  background:#fff;
  transition:transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}
.content-wall-item:hover {
  transform:translate(-5px,-5px);
  box-shadow:var(--hard);
  border-color:var(--line-hard);
}
.content-wall-item img {
  width:100%; height:200px; object-fit:cover;
  border-bottom:1px solid var(--line);
  filter:saturate(1.05) contrast(1.03);
}
.content-wall-body { padding:22px; }
.content-wall-body h4{ font-size:1.05rem; font-weight:800; letter-spacing:-.01em; margin-bottom:8px; }
.content-wall-body p{ font-size:.88rem; color:var(--ink-mid); line-height:1.75; }
.content-wall-body time{
  display:block; margin-top:14px;
  font-size:.72rem; font-weight:700; letter-spacing:.16em;
  text-transform:uppercase; color:var(--ink-soft);
}

/* ---------- FAQ ---------- */
.faq-list { max-width:820px; margin:0 auto; }
.faq-item {
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--r);
  margin-bottom:10px;
  overflow:hidden;
  cursor:pointer;
  transition:border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.faq-item:hover{ border-color:var(--line-hard); box-shadow:var(--hard-sm); }

.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:0 0 auto;
  width:24px; height:24px;
  display:flex; align-items:center; justify-content:center;
  font-size:1rem; font-weight:900; line-height:1;
  background:var(--lime); color:var(--ink);
  border:1px solid var(--ink); border-radius:var(--r);
  transition:transform .25s var(--ease), background .25s var(--ease);
}
.faq-item.open .faq-question::after{
  content:'–';
  background:var(--accent); color:#fff;
  transform:rotate(180deg);
}
.faq-item .faq-answer {
  padding:0 22px 18px;
  display:none;
  color:var(--ink-mid); font-size:.92rem; line-height:1.85;
}
.faq-item.open .faq-answer { display:block; }

/* ---------- CTA横幅 ---------- */
.cta-banner {
  position:relative; overflow:hidden;
  padding:60px 24px;
  text-align:center;
  border-radius:var(--r);
  color:var(--ink);
  background:linear-gradient(118deg, var(--accent) 0%, #FFB03A 48%, var(--lime) 100%);
  border:1.5px solid var(--ink);
  box-shadow:12px 12px 0 var(--ink);
}
.cta-banner::after{
  content:''; position:absolute; inset:0;
  background-image:linear-gradient(rgba(23,21,15,.06) 1px, transparent 1px),
                   linear-gradient(90deg, rgba(23,21,15,.06) 1px, transparent 1px);
  background-size:22px 22px;
  pointer-events:none;
}
.cta-banner > *{ position:relative; z-index:1; }
.cta-banner h2 {
  color:var(--ink);
  font-size:clamp(1.6rem, 3.2vw, 2.4rem);
  font-weight:900; letter-spacing:-.03em; line-height:1.15;
  margin-bottom:12px;
}
.cta-banner p{ color:rgba(23,21,15,.78); margin-bottom:28px; }
.cta-banner .btn-primary {
  background:#fff; color:var(--ink);
  box-shadow:5px 5px 0 var(--ink);
}
.cta-banner .btn-primary:hover{ transform:translate(-3px,-3px); box-shadow:8px 8px 0 var(--ink); }

/* ---------- 页脚 ---------- */
.site-footer {
  padding:56px 0 28px;
  background:var(--paper-2);
  border-top:1px solid var(--line);
}
.site-footer .container { }

.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-mid); font-size:.9rem; line-height:1.8; max-width:320px; }

.footer-col h4{
  font-size:.76rem; font-weight:800; letter-spacing:.2em;
  text-transform:uppercase; color:var(--ink-soft);
  margin-bottom:16px;
}
.footer-col ul{ list-style:none; }
.footer-col li{ margin-bottom:10px; }
.footer-col a{
  text-decoration:none; font-size:.9rem; color:var(--ink-mid);
  transition:color .2s var(--ease), padding-left .2s var(--ease);
}
.footer-col a:hover{ color:var(--accent); padding-left:5px; }

.footer-bottom {
  border-top:1px solid var(--line);
  margin-top:40px; padding-top:22px;
  text-align:center; font-size:.82rem;
  color:var(--ink-soft); letter-spacing:.02em;
}

/* ---------- 工具类 ---------- */
.text-accent { color:var(--accent); }
.text-center { text-align:center; }
.seo-description {
  max-width:620px; margin:0 auto 48px;
  color:var(--ink-mid); line-height:1.85; font-size:.98rem;
}
.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px){
  .feature-block{ gap:36px; }
  .footer-grid{ grid-template-columns:1fr 1fr; gap:32px; }
}

@media (max-width: 768px) {
  .section{ padding:64px 0; }
  .hero{ padding:120px 0 70px; }
  .hero::after{ display:none; }
  .feature-block { grid-template-columns:1fr; }
  .stats-bar { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:1fr 1fr; }

  .menu-toggle { display:flex; }

  .main-nav {
    display:none;
    position:absolute; top:68px; left:0; width:100%;
    background:var(--paper);
    border-bottom:1px solid var(--line);
    padding:22px 24px 28px;
    gap:18px;
    box-shadow:0 12px 24px rgba(23,21,15,.08);
  }
  .main-nav.open {
    display:flex; flex-direction:column; align-items:flex-start;
  }
  .main-nav.open a{ font-size:1rem; }
  .nav-cta{ margin-top:6px; }
}

@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{ box-shadow:6px 6px 0 var(--ink); padding:44px 18px; }
  .feature-image, .hero-image{ box-shadow:6px 6px 0 var(--lime); }
}