/* 基础重置与全局样式 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,'Noto Sans SC',sans-serif;line-height:1.6;color:#1a1a2e;background:#f8fafc;transition:background .3s,color .3s}
body.dark{background:#0f172a;color:#e2e8f0}
a{color:#1a6b4a;text-decoration:none}
a:hover{text-decoration:underline}
img,svg{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* 导航吸顶 */
.navbar{position:sticky;top:0;z-index:1000;background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.05);transition:background .3s;padding:12px 0}
body.dark .navbar{background:#1e293b;box-shadow:0 2px 8px rgba(0,0,0,.3)}
.navbar .container{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap}
.navbar .logo{font-size:1.5rem;font-weight:700;color:#2d6a4f;display:flex;align-items:center;gap:8px}
body.dark .navbar .logo{color:#95d5b2}
.nav-links{display:flex;gap:24px;list-style:none;flex-wrap:wrap}
.nav-links a{font-size:.95rem;color:#1a1a2e;padding:6px 0;border-bottom:2px solid transparent;transition:.2s}
body.dark .nav-links a{color:#cbd5e1}
.nav-links a:hover{border-bottom-color:#2d6a4f;text-decoration:none}
.menu-toggle{display:none;background:none;border:none;font-size:1.8rem;cursor:pointer;color:#1a1a2e}
body.dark .menu-toggle{color:#e2e8f0}
.search-box{display:flex;gap:6px;align-items:center}
.search-box input{padding:6px 12px;border:1px solid #ccc;border-radius:20px;font-size:.9rem;outline:none;width:160px;transition:.3s}
body.dark .search-box input{background:#1e293b;color:#e2e8f0;border-color:#475569}
.search-box button{padding:6px 14px;background:#2d6a4f;color:#fff;border:none;border-radius:20px;cursor:pointer;font-size:.85rem}
.dark-toggle{background:none;border:1px solid #ccc;border-radius:20px;padding:4px 12px;cursor:pointer;font-size:.85rem;margin-left:8px}
body.dark .dark-toggle{border-color:#475569;color:#e2e8f0}

/* 面包屑 */
.breadcrumb{padding:16px 0;font-size:.9rem;color:#475569}
body.dark .breadcrumb{color:#94a3b8}
.breadcrumb a{color:#1a6b4a}
.breadcrumb span{margin:0 6px}

/* hero banner - 渐变与毛玻璃 */
.hero{background:linear-gradient(135deg,#d8f3dc 0%,#b7e4c7 100%);padding:60px 0;text-align:center;position:relative;overflow:hidden}
body.dark .hero{background:linear-gradient(135deg,#1b4332,#2d6a4f)}
.hero h1{font-size:2.8rem;color:#1b4332;margin-bottom:16px;font-weight:800}
body.dark .hero h1{color:#d8f3dc}
.hero p{font-size:1.2rem;max-width:700px;margin:0 auto 24px;color:#2d6a4f}
body.dark .hero p{color:#b7e4c7}
.hero .cta-btn{display:inline-block;background:#1b4332;color:#fff;padding:14px 36px;border-radius:40px;font-size:1.1rem;font-weight:600;transition:.3s}
.hero .cta-btn:hover{background:#2d6a4f;transform:translateY(-2px);text-decoration:none}
.hero-slider{display:flex;gap:20px;justify-content:center;margin-top:30px;flex-wrap:wrap}
.hero-slider .slide{background:rgba(255,255,255,.7);backdrop-filter:blur(4px);padding:20px 28px;border-radius:16px;max-width:280px;text-align:left;font-size:.95rem;color:#1b4332}
body.dark .hero-slider .slide{background:rgba(30,41,59,.7);color:#e2e8f0}

/* 通用section */
section{padding:60px 0}
.section-title{font-size:2rem;text-align:center;margin-bottom:40px;color:#1b4332;position:relative}
body.dark .section-title{color:#95d5b2}
.section-title::after{content:'';display:block;width:60px;height:4px;background:#2d6a4f;margin:12px auto 0;border-radius:2px}

/* 网格 */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:24px}
.grid-4{display:grid;grid-template-columns:1fr 1fr 1fr 1fr;gap:20px}

/* 卡片 - 圆角、阴影、hover动画 */
.card{background:#fff;border-radius:16px;padding:24px;box-shadow:0 4px 12px rgba(0,0,0,.04);transition:.3s}
body.dark .card{background:#1e293b;box-shadow:0 4px 12px rgba(0,0,0,.2)}
.card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.08)}

/* 数字动画 */
.stats{display:flex;justify-content:center;gap:40px;flex-wrap:wrap;margin:30px 0}
.stat-item{text-align:center}
.stat-number{font-size:2.5rem;font-weight:800;color:#2d6a4f}
body.dark .stat-number{color:#95d5b2}
.stat-label{color:#475569;margin-top:4px}

/* 文章卡片 */
.article-card h3{font-size:1.2rem;margin-bottom:8px;color:#1b4332}
body.dark .article-card h3{color:#d8f3dc}
.article-meta{font-size:.85rem;color:#64748b;margin-bottom:8px}
.article-excerpt{color:#334155;margin-bottom:12px}
body.dark .article-excerpt{color:#cbd5e1}
.read-more{color:#2d6a4f;font-weight:600}

/* FAQ */
.faq-item{border-bottom:1px solid #e2e8f0;padding:16px 0}
body.dark .faq-item{border-color:#334155}
.faq-question{display:flex;justify-content:space-between;align-items:center;cursor:pointer;font-weight:600;font-size:1.05rem;color:#1b4332}
body.dark .faq-question{color:#d8f3dc}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease;color:#334155;padding-top:0}
body.dark .faq-answer{color:#cbd5e1}
.faq-item.open .faq-answer{max-height:400px;padding-top:12px}
.faq-toggle{font-size:1.4rem;transition:transform .3s}
.faq-item.open .faq-toggle{transform:rotate(45deg)}

/* 联系 */
.contact-info p{margin:6px 0;font-size:.95rem}
.contact-info strong{color:#1b4332}
body.dark .contact-info strong{color:#95d5b2}

/* footer */
footer{background:#1b4332;color:#d8f3dc;padding:40px 0 20px;font-size:.9rem}
footer a{color:#95d5b2}
footer .footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:30px;margin-bottom:30px}
footer h4{color:#f0fdf4;margin-bottom:12px;font-size:1rem}
footer ul{list-style:none}
footer ul li{margin:6px 0}
footer .copyright{text-align:center;border-top:1px solid #2d6a4f;padding-top:20px;margin-top:20px;font-size:.85rem}

/* 返回顶部 */
.back-to-top{position:fixed;bottom:30px;right:30px;background:#2d6a4f;color:#fff;width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;cursor:pointer;opacity:0;visibility:hidden;transition:.3s;border:none;z-index:999}
.back-to-top.show{opacity:1;visibility:visible}

/* 滚动动画 */
.fade-up{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.fade-up.visible{opacity:1;transform:translateY(0)}

/* 响应式 */
@media(max-width:768px){
    .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
    .hero h1{font-size:2rem}
    .nav-links{display:none;width:100%;flex-direction:column;gap:12px;padding:16px 0}
    .nav-links.active{display:flex}
    .menu-toggle{display:block}
    .search-box input{width:120px}
    .stats{flex-direction:column;align-items:center;gap:20px}
}
@media(min-width:769px){
    .menu-toggle{display:none}
}