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

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
  background: #f5f0eb;
  color: #2c2418;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

.section { padding: 80px 0; }

.section:nth-child(even) { background: #ebe2d8; }

/* ===== 导航 - 纸艺折叠风格 ===== */
.site-header { 
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  background: rgba(245, 240, 235, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 2px solid #d4c5b0;
  box-shadow: 0 2px 20px rgba(44, 36, 24, 0.06);
}

.header-inner { 
  display: flex; align-items: center; justify-content: space-between;
  height: 72px; max-width: 1200px; margin: 0 auto; padding: 0 24px;
}

.logo { 
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 1.25rem; text-decoration: none; color: #2c2418;
  letter-spacing: -0.5px;
}

.logo-icon { 
  width: 40px; height: 40px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  background: #d4c5b0;
  color: #5a4a34;
  position: relative;
  transform: rotate(-3deg);
  box-shadow: 3px 3px 0 #b8a48a;
}

.main-nav { display: flex; align-items: center; gap: 28px; list-style: none; }

.main-nav a { 
  text-decoration: none; font-size: 0.9rem; font-weight: 600;
  color: #5a4a34;
  transition: 0.2s;
  letter-spacing: 0.3px;
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: #c4a882;
  transition: 0.3s;
}

.main-nav a:hover { color: #2c2418; }
.main-nav a:hover::after { width: 100%; }

.nav-cta { 
  padding: 10px 24px; border-radius: 6px; 
  color: #f5f0eb !important; font-weight: 700;
  background: #5a4a34;
  position: relative;
  box-shadow: 4px 4px 0 #b8a48a;
  transition: 0.2s;
}

.nav-cta:hover { 
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #b8a48a;
  color: #f5f0eb !important;
}

.nav-cta::after { display: none; }

.menu-toggle { display: none; }

/* ===== Hero - 折纸层叠 ===== */
.hero { 
  min-height: 75vh; display: flex; align-items: center;
  position: relative;
  background: linear-gradient(135deg, #f5f0eb 0%, #e8dccc 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -40px; right: -80px;
  width: 400px; height: 400px;
  background: #d4c5b0;
  transform: rotate(15deg);
  opacity: 0.3;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 30% 100%);
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -60px; left: -60px;
  width: 300px; height: 300px;
  background: #c4a882;
  transform: rotate(-20deg);
  opacity: 0.2;
  clip-path: polygon(20% 0, 100% 20%, 80% 100%, 0 80%);
}

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

.hero-eyebrow { 
  display: inline-block; font-size: 0.8rem; font-weight: 700;
  padding: 6px 18px; border-radius: 0;
  margin-bottom: 18px;
  background: #d4c5b0;
  color: #5a4a34;
  letter-spacing: 2px;
  text-transform: uppercase;
  box-shadow: 3px 3px 0 #b8a48a;
}

.hero h1 { 
  font-size: 3rem; line-height: 1.15; margin-bottom: 20px;
  font-weight: 800;
  letter-spacing: -1px;
  color: #2c2418;
}

.hero p { 
  font-size: 1.1rem; opacity: 0.75; max-width: 560px; margin-bottom: 36px;
  color: #5a4a34;
  line-height: 1.7;
}

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

.hero-image { 
  border-radius: 4px; overflow: hidden;
  box-shadow: 8px 8px 0 #b8a48a;
  position: relative;
  z-index: 1;
}

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

/* ===== 按钮 - 折纸棱角 ===== */
.btn { 
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 30px; border-radius: 4px;
  font-weight: 700; cursor: pointer; border: none;
  text-decoration: none; transition: 0.2s;
  font-size: 0.9rem;
  letter-spacing: 0.3px;
}

.btn-primary { 
  color: #f5f0eb; 
  background: #5a4a34;
  box-shadow: 4px 4px 0 #b8a48a;
}

.btn-primary:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #b8a48a;
}

.btn-outline { 
  background: transparent; 
  border: 2px solid #5a4a34;
  color: #5a4a34;
  box-shadow: 3px 3px 0 #d4c5b0;
}

.btn-outline:hover {
  background: #d4c5b0;
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 #b8a48a;
}

/* ===== 标签/标题 ===== */
.section-label { 
  display: inline-block; font-size: 0.75rem; font-weight: 700;
  letter-spacing: 3px; margin-bottom: 12px;
  color: #8a7a64;
  text-transform: uppercase;
  padding: 4px 12px;
  background: #d4c5b0;
  box-shadow: 2px 2px 0 #b8a48a;
}

.section-title { 
  font-size: 2.2rem; margin-bottom: 14px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #2c2418;
}

.section-desc { 
  max-width: 600px; opacity: 0.7; margin-bottom: 40px;
  color: #5a4a34;
  line-height: 1.7;
}

/* ===== 卡片网格 - 折纸卡片 ===== */
.cards-grid { 
  display: grid; 
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); 
  gap: 28px; 
}

.category-card { 
  border-radius: 4px; padding: 32px 28px;
  border: 2px solid #d4c5b0;
  background: #faf7f3;
  transition: 0.25s;
  position: relative;
  box-shadow: 5px 5px 0 #b8a48a;
}

.category-card:hover { 
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 #a8947a;
  border-color: #c4a882;
}

.card-icon { 
  width: 50px; height: 50px; border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px; font-size: 1.4rem;
  background: #e8dccc;
  color: #5a4a34;
  box-shadow: 3px 3px 0 #d4c5b0;
}

.card-link { 
  font-weight: 700; font-size: 0.85rem; text-decoration: none;
  color: #5a4a34;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: 0.2s;
}

.card-link:hover { color: #2c2418; gap: 10px; }

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

.feature-image { 
  border-radius: 4px; overflow: hidden;
  box-shadow: 8px 8px 0 #b8a48a;
}

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

.feature-text { }

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

.feature-list li { 
  padding: 8px 0; display: flex; align-items: center; gap: 10px;
  font-weight: 500;
  color: #5a4a34;
}

.feature-list li::before { 
  content: '✧'; 
  font-weight: 700; 
  color: #c4a882;
  font-size: 1.1rem;
}

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

.stat-item { 
  padding: 28px 20px; border-radius: 4px;
  border: 2px solid #d4c5b0;
  background: #faf7f3;
  box-shadow: 4px 4px 0 #b8a48a;
}

.stat-number { 
  font-size: 2.5rem; font-weight: 800;
  color: #2c2418;
  letter-spacing: -1px;
}

.stat-label { 
  font-size: 0.9rem; opacity: 0.6; margin-top: 8px;
  color: #5a4a34;
  font-weight: 500;
}

/* ===== 内容墙 ===== */
.content-wall { 
  display: grid; 
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); 
  gap: 28px; 
}

.content-wall-item { 
  border-radius: 4px; overflow: hidden;
  border: 2px solid #d4c5b0;
  background: #faf7f3;
  transition: 0.25s;
  box-shadow: 5px 5px 0 #b8a48a;
}

.content-wall-item:hover { 
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 #a8947a;
}

.content-wall-item img { 
  width: 100%; height: 200px; object-fit: cover;
  display: block;
}

.content-wall-body { padding: 24px; }

.content-wall-body h3 { 
  font-size: 1.1rem; margin-bottom: 8px;
  color: #2c2418;
}

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

.faq-item { 
  border: 2px solid #d4c5b0; border-radius: 4px;
  margin-bottom: 10px; overflow: hidden; cursor: pointer;
  background: #faf7f3;
  box-shadow: 3px 3px 0 #b8a48a;
  transition: 0.2s;
}

.faq-item:hover { box-shadow: 4px 4px 0 #a8947a; }

.faq-item .faq-question { 
  padding: 18px 22px; font-weight: 700;
  display: flex; justify-content: space-between;
  color: #2c2418;
  font-size: 1rem;
}

.faq-item .faq-question::after {
  content: '▸';
  transition: 0.3s;
  color: #c4a882;
}

.faq-item.open .faq-question::after {
  transform: rotate(90deg);
}

.faq-item .faq-answer { 
  padding: 0 22px 18px; display: none; 
  opacity: 0.75; color: #5a4a34;
  line-height: 1.7;
}

.faq-item.open .faq-answer { display: block; }

/* ===== CTA横幅 ===== */
.cta-banner { 
  padding: 60px 24px; text-align: center; border-radius: 4px;
  background: #5a4a34;
  color: #f5f0eb;
  box-shadow: 8px 8px 0 #b8a48a;
  position: relative;
}

.cta-banner h2 { 
  color: #f5f0eb; 
  font-size: 2rem;
  margin-bottom: 12px;
}

.cta-banner p { 
  color: #d4c5b0;
  max-width: 500px;
  margin: 0 auto 28px;
  line-height: 1.6;
}

.cta-banner .btn-primary { 
  background: #f5f0eb;
  color: #5a4a34;
  box-shadow: 4px 4px 0 #d4c5b0;
}

.cta-banner .btn-primary:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 #d4c5b0;
}

/* ===== 页脚 ===== */
.site-footer { 
  padding: 60px 0 28px; 
  background: #2c2418;
  color: #d4c5b0;
}

.site-footer .container { }

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

.footer-brand { }
.footer-brand h3 { 
  color: #f5f0eb;
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.footer-brand p { opacity: 0.6; line-height: 1.6; font-size: 0.9rem; }

.footer-col { }
.footer-col h4 { 
  color: #f5f0eb;
  margin-bottom: 16px;
  font-size: 0.95rem;
  letter-spacing: 1px;
}

.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { 
  color: #b8a48a; 
  text-decoration: none;
  font-size: 0.9rem;
  transition: 0.2s;
}

.footer-col ul li a:hover { color: #d4c5b0; }

.footer-bottom { 
  border-top: 1px solid rgba(212, 197, 176, 0.15); 
  margin-top: 40px; padding-top: 20px; 
  text-align: center; font-size: 0.85rem;
  color: #8a7a64;
}

/* ===== 工具类 ===== */
.text-accent { color: #c4a882; }
.text-center { text-align: center; }

.seo-description { 
  max-width: 600px; margin: 0 auto 48px; 
  opacity: 0.7; color: #5a4a34;
  line-height: 1.7;
}

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

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .feature-block { grid-template-columns: 1fr; gap: 40px; }
  .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: 72px; left: 0; width: 100%; 
    background: rgba(245, 240, 235, 0.98);
    padding: 24px;
    border-bottom: 2px solid #d4c5b0;
    gap: 16px;
  }
  
  .hero h1 { font-size: 2.2rem; }
  .hero::before, .hero::after { opacity: 0.15; }
}

@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; }
  .hero h1 { font-size: 1.8rem; }
  .section-title { font-size: 1.6rem; }
}