*, *::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: #fefcf5; color: #3d2b1f; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; position: relative; }
.section:nth-child(even) { background: #f8f4ec; }

/* 导航 — 西瓜主题 */
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: rgba(254, 252, 245, 0.92); backdrop-filter: blur(16px); border-bottom: 2px solid #e8d5b5; }
.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: 1.4rem; text-decoration: none; color: #2e5c3e; letter-spacing: 1px; }
.logo-icon { width: 40px; height: 40px; border-radius: 50%; background: linear-gradient(135deg, #4a8c5c, #2e5c3e); display: flex; align-items: center; justify-content: center; font-size: 1.2rem; color: #fff; box-shadow: 0 4px 12px rgba(46, 92, 62, 0.3); }
.main-nav { display: flex; align-items: center; gap: 28px; list-style: none; }
.main-nav a { text-decoration: none; font-size: 0.95rem; font-weight: 500; color: #5a4a3a; transition: 0.3s; position: relative; padding: 4px 0; }
.main-nav a::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px; background: #4a8c5c; transition: 0.3s; }
.main-nav a:hover { color: #2e5c3e; }
.main-nav a:hover::after { width: 100%; }
.nav-cta { padding: 10px 24px; border-radius: 50px; background: linear-gradient(135deg, #4a8c5c, #2e5c3e); color: #fff !important; font-weight: 700; box-shadow: 0 4px 14px rgba(74, 140, 92, 0.35); }
.nav-cta::after { display: none !important; }
.menu-toggle { display: none; background: none; border: none; font-size: 1.5rem; color: #3d2b1f; cursor: pointer; }

/* Hero — 西瓜切片风格 */
.hero { min-height: 75vh; display: flex; align-items: center; background: linear-gradient(170deg, #fefcf5 0%, #f5efe4 40%, #e8d5b5 100%); position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -20%; right: -10%; width: 500px; height: 500px; border-radius: 50%; background: radial-gradient(circle, rgba(74, 140, 92, 0.15), transparent 70%); pointer-events: none; }
.hero::after { content: ''; position: absolute; bottom: -15%; left: -8%; width: 400px; height: 400px; border-radius: 50%; background: radial-gradient(circle, rgba(232, 213, 181, 0.4), transparent 70%); pointer-events: none; }
.hero-content { max-width: 680px; position: relative; z-index: 1; }
.hero-eyebrow { display: inline-block; font-size: 0.8rem; font-weight: 700; padding: 6px 18px; border-radius: 50px; background: #4a8c5c; color: #fff; margin-bottom: 20px; letter-spacing: 2px; text-transform: uppercase; }
.hero h1 { font-size: 3.2rem; line-height: 1.15; margin-bottom: 20px; color: #2e5c3e; font-weight: 900; }
.hero h1 span { display: block; background: linear-gradient(135deg, #4a8c5c, #e8a23e); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { font-size: 1.15rem; color: #5a4a3a; opacity: 0.85; max-width: 520px; margin-bottom: 36px; line-height: 1.7; }
.hero-buttons { display: flex; gap: 16px; }
.hero-image { border-radius: 20px; overflow: hidden; box-shadow: 0 20px 60px rgba(46, 92, 62, 0.2); border: 4px solid #fff; }
.hero-image img { width: 100%; height: auto; display: block; }

/* 按钮 — 西瓜色系 */
.btn { display: inline-flex; align-items: center; gap: 10px; padding: 14px 32px; border-radius: 50px; font-weight: 700; cursor: pointer; border: none; text-decoration: none; transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94); font-size: 0.95rem; }
.btn-primary { background: linear-gradient(135deg, #4a8c5c, #2e5c3e); color: #fff; box-shadow: 0 6px 20px rgba(74, 140, 92, 0.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(74, 140, 92, 0.45); }
.btn-outline { background: transparent; border: 2px solid #4a8c5c; color: #2e5c3e; }
.btn-outline:hover { background: #4a8c5c; color: #fff; }

/* 标签/标题 */
.section-label { display: inline-block; font-size: 0.75rem; font-weight: 800; letter-spacing: 3px; margin-bottom: 14px; color: #4a8c5c; text-transform: uppercase; position: relative; padding-left: 28px; }
.section-label::before { content: '◆'; position: absolute; left: 0; color: #e8a23e; }
.section-title { font-size: 2.4rem; margin-bottom: 16px; color: #2e5c3e; font-weight: 900; line-height: 1.2; }
.section-desc { max-width: 600px; color: #5a4a3a; opacity: 0.8; margin-bottom: 44px; font-size: 1.05rem; line-height: 1.7; }

/* 卡片网格 — 西瓜籽灵感 */
.cards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 28px; }
.category-card { border-radius: 20px; padding: 32px; background: #fff; border: 2px solid #e8d5b5; transition: all 0.3s; position: relative; overflow: hidden; }
.category-card::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 4px; background: linear-gradient(90deg, #4a8c5c, #e8a23e); opacity: 0; transition: 0.3s; }
.category-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(46, 92, 62, 0.12); border-color: #4a8c5c; }
.category-card:hover::before { opacity: 1; }
.card-icon { width: 54px; height: 54px; border-radius: 16px; background: linear-gradient(135deg, #f5efe4, #e8d5b5); display: flex; align-items: center; justify-content: center; margin-bottom: 18px; font-size: 1.5rem; color: #2e5c3e; }
.card-link { font-weight: 700; font-size: 0.85rem; text-decoration: none; color: #4a8c5c; display: inline-flex; align-items: center; gap: 6px; }
.card-link::after { content: '→'; transition: 0.3s; }
.card-link:hover::after { transform: translateX(4px); }

/* 特性块 — 左右交错 */
.feature-block { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.feature-image { border-radius: 20px; overflow: hidden; box-shadow: 0 16px 48px rgba(46, 92, 62, 0.15); border: 3px solid #fff; }
.feature-image img { width: 100%; height: auto; display: block; }
.feature-text h3 { font-size: 1.8rem; color: #2e5c3e; margin-bottom: 16px; font-weight: 800; }
.feature-list { list-style: none; margin-top: 20px; }
.feature-list li { padding: 10px 0; display: flex; align-items: center; gap: 12px; font-size: 1rem; color: #5a4a3a; border-bottom: 1px dashed #e8d5b5; }
.feature-list li::before { content: '🍉'; font-weight: 700; font-size: 1.1rem; }

/* 数据条 — 西瓜切片 */
.stats-bar { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-item { padding: 28px 16px; border-radius: 20px; background: #fff; border: 2px solid #e8d5b5; transition: 0.3s; }
.stat-item:hover { border-color: #4a8c5c; box-shadow: 0 8px 24px rgba(74, 140, 92, 0.1); }
.stat-number { font-size: 2.6rem; font-weight: 900; color: #2e5c3e; line-height: 1; }
.stat-number::after { content: '+'; color: #e8a23e; }
.stat-label { font-size: 0.9rem; color: #5a4a3a; opacity: 0.7; margin-top: 8px; font-weight: 500; }

/* 内容墙 */
.content-wall { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 28px; }
.content-wall-item { border-radius: 20px; overflow: hidden; background: #fff; border: 2px solid #e8d5b5; transition: 0.3s; }
.content-wall-item:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(46, 92, 62, 0.12); border-color: #4a8c5c; }
.content-wall-item img { width: 100%; height: 220px; object-fit: cover; display: block; }
.content-wall-body { padding: 24px; }
.content-wall-body h4 { font-size: 1.1rem; color: #2e5c3e; margin-bottom: 8px; font-weight: 700; }
.content-wall-body p { color: #5a4a3a; opacity: 0.7; font-size: 0.9rem; line-height: 1.6; }

/* FAQ — 西瓜条纹 */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border: 2px solid #e8d5b5; border-radius: 16px; margin-bottom: 12px; overflow: hidden; cursor: pointer; background: #fff; transition: 0.3s; }
.faq-item:hover { border-color: #4a8c5c; }
.faq-item .faq-question { padding: 20px 24px; font-weight: 700; color: #2e5c3e; display: flex; justify-content: space-between; align-items: center; font-size: 1.05rem; }
.faq-item .faq-question::after { content: '🍉'; font-size: 1.2rem; transition: 0.3s; }
.faq-item.open .faq-question::after { transform: rotate(180deg); }
.faq-item .faq-answer { padding: 0 24px 20px; display: none; color: #5a4a3a; opacity: 0.8; line-height: 1.7; }
.faq-item.open .faq-answer { display: block; }
.faq-item.open { border-color: #4a8c5c; }

/* CTA横幅 — 西瓜渐变 */
.cta-banner { padding: 64px 32px; text-align: center; border-radius: 24px; background: linear-gradient(135deg, #2e5c3e 0%, #4a8c5c 50%, #e8a23e 100%); color: #fff; position: relative; overflow: hidden; }
.cta-banner::before { content: ''; position: absolute; top: -50%; right: -30%; width: 400px; height: 400px; border-radius: 50%; background: rgba(255,255,255,0.08); pointer-events: none; }
.cta-banner h2 { color: #fff; font-size: 2.2rem; font-weight: 900; margin-bottom: 12px; }
.cta-banner p { color: rgba(255,255,255,0.9); max-width: 500px; margin: 0 auto 28px; font-size: 1.05rem; }
.cta-banner .btn-primary { background: #fff; color: #2e5c3e; box-shadow: 0 6px 20px rgba(0,0,0,0.15); }
.cta-banner .btn-primary:hover { background: #f5efe4; }

/* 页脚 — 大地色系 */
.site-footer { padding: 64px 0 32px; background: #3d2b1f; color: #e8d5b5; }
.site-footer .container { }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; }
.footer-brand h3 { color: #fff; font-size: 1.3rem; margin-bottom: 12px; }
.footer-brand p { color: #c4b49a; font-size: 0.9rem; line-height: 1.7; }
.footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: 16px; font-weight: 700; letter-spacing: 1px; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: #c4b49a; text-decoration: none; font-size: 0.9rem; transition: 0.3s; }
.footer-col ul li a:hover { color: #e8a23e; }
.footer-bottom { border-top: 1px solid rgba(232, 213, 181, 0.15); margin-top: 48px; padding-top: 24px; text-align: center; font-size: 0.85rem; color: #c4b49a; }

/* 工具类 */
.text-accent { color: #e8a23e; }
.text-center { text-align: center; }
.seo-description { max-width: 600px; margin: 0 auto 48px; color: #5a4a3a; opacity: 0.7; 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; align-items: center; justify-content: center; width: 44px; height: 44px; }
  .main-nav.open { display: flex; flex-direction: column; position: absolute; top: 72px; left: 0; width: 100%; background: #fefcf5; padding: 24px 20px; border-bottom: 2px solid #e8d5b5; gap: 16px; }
  .hero h1 { font-size: 2.4rem; }
  .section-title { font-size: 1.8rem; }
}
@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; }
  .stat-number { font-size: 2rem; }
}