*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#1a5f2a;
  --primary-dark:#0d3d18;
  --primary-light:#2d8a42;
  --accent:#f5c518;
  --bg:#f8faf8;
  --text:#1a1a1a;
  --text-muted:#555;
  --border:#e0e8e0;
  --white:#fff;
  --shadow:0 2px 12px rgba(0,0,0,.08);
  --radius:8px;
  --max-w:1200px;
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.7}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-light)}
img{max-width:100%;height:auto;display:block}
.container{max-width:var(--max-w);margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:var(--primary-dark);position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:var(--max-w);margin:0 auto}
.logo{display:flex;align-items:center;gap:10px}
.logo img{width:48px;height:48px;border-radius:6px;object-fit:cover}
.logo span{color:var(--white);font-size:1.25rem;font-weight:700}
.nav-main{display:flex;gap:4px;list-style:none}
.nav-main a{color:rgba(255,255,255,.9);padding:8px 16px;border-radius:var(--radius);font-size:.95rem}
.nav-main a:hover,.nav-main a.active{background:rgba(255,255,255,.15);color:var(--white)}
.nav-cta{display:flex;gap:8px}
.btn{display:inline-block;padding:10px 24px;border-radius:var(--radius);font-weight:600;font-size:.95rem;border:none;cursor:pointer;transition:all .2s;text-align:center}
.btn-primary{background:var(--accent);color:var(--primary-dark)}
.btn-primary:hover{background:#e6b800;color:var(--primary-dark)}
.btn-outline{background:transparent;border:2px solid var(--white);color:var(--white)}
.btn-outline:hover{background:var(--white);color:var(--primary-dark)}
.btn-green{background:var(--primary);color:var(--white)}
.btn-green:hover{background:var(--primary-light);color:var(--white)}
.menu-toggle{display:none;background:none;border:none;color:var(--white);font-size:1.5rem;cursor:pointer}

/* Hero */
.hero{background:linear-gradient(135deg,var(--primary-dark) 0%,var(--primary) 60%,var(--primary-light) 100%);color:var(--white);padding:60px 0}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.hero h1{font-size:2.2rem;line-height:1.3;margin-bottom:16px}
.hero-desc{font-size:1.1rem;opacity:.92;margin-bottom:24px}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap}
.hero-img{border-radius:var(--radius);overflow:hidden;box-shadow:0 8px 32px rgba(0,0,0,.25)}

/* Breadcrumb */
.breadcrumb{background:var(--white);border-bottom:1px solid var(--border);padding:12px 0;font-size:.875rem;color:var(--text-muted)}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--primary)}

/* Sections */
section{padding:56px 0}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:1.75rem;color:var(--primary-dark);margin-bottom:8px}
.section-title p{color:var(--text-muted);max-width:600px;margin:0 auto}
.bg-white{background:var(--white)}
.bg-light{background:var(--bg)}

/* Cards Grid */
.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .2s}
.card:hover{transform:translateY(-4px)}
.card-img{height:180px;overflow:hidden}
.card-img img{width:100%;height:100%;object-fit:cover}
.card-body{padding:20px}
.card-body h3{font-size:1.15rem;margin-bottom:8px;color:var(--primary-dark)}
.card-body p{color:var(--text-muted);font-size:.925rem}

/* Features */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.feature-item{background:var(--white);padding:24px;border-radius:var(--radius);border-left:4px solid var(--primary);box-shadow:var(--shadow)}
.feature-item h3{font-size:1.05rem;margin-bottom:8px;color:var(--primary-dark)}
.feature-item p{font-size:.9rem;color:var(--text-muted)}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;counter-reset:step}
.step{background:var(--white);padding:24px;border-radius:var(--radius);text-align:center;box-shadow:var(--shadow);position:relative}
.step::before{counter-increment:step;content:counter(step);display:block;width:40px;height:40px;line-height:40px;background:var(--primary);color:var(--white);border-radius:50%;margin:0 auto 12px;font-weight:700}
.step h3{font-size:1rem;margin-bottom:6px}
.step p{font-size:.875rem;color:var(--text-muted)}

/* Partners */
.partner-grid{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;align-items:center}
.partner-grid img{height:48px;width:auto;opacity:.8;transition:opacity .2s}
.partner-grid img:hover{opacity:1}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--white);border-radius:var(--radius);margin-bottom:12px;box-shadow:var(--shadow);overflow:hidden}
.faq-item summary{padding:16px 20px;font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::after{content:"+";font-size:1.25rem;color:var(--primary)}
.faq-item[open] summary::after{content:"−"}
.faq-item p{padding:0 20px 16px;color:var(--text-muted);font-size:.925rem}

/* Content Article */
.article{max-width:860px;margin:0 auto}
.article h1{font-size:1.75rem;color:var(--primary-dark);margin-bottom:16px}
.article h2{font-size:1.35rem;color:var(--primary-dark);margin:32px 0 12px;padding-bottom:8px;border-bottom:2px solid var(--border)}
.article h3{font-size:1.1rem;color:var(--primary);margin:24px 0 8px}
.article p{margin-bottom:16px;color:var(--text)}
.article ul,.article ol{margin:0 0 16px 24px;color:var(--text)}
.article li{margin-bottom:6px}
.article img{border-radius:var(--radius);margin:20px auto;box-shadow:var(--shadow)}

/* Form Pages */
.form-page{max-width:520px;margin:0 auto}
.form-card{background:var(--white);padding:36px;border-radius:var(--radius);box-shadow:var(--shadow)}
.form-card h1{font-size:1.5rem;text-align:center;margin-bottom:8px;color:var(--primary-dark)}
.form-card .subtitle{text-align:center;color:var(--text-muted);margin-bottom:24px;font-size:.925rem}
.form-group{margin-bottom:16px}
.form-group label{display:block;margin-bottom:6px;font-weight:600;font-size:.9rem}
.form-group input{width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:var(--radius);font-size:1rem;transition:border-color .2s}
.form-group input:focus{outline:none;border-color:var(--primary)}
.form-card .btn{width:100%;margin-top:8px}
.form-links{text-align:center;margin-top:16px;font-size:.9rem}
.seo-content{max-width:860px;margin:40px auto 0}

/* Error Pages */
.error-page{text-align:center;padding:80px 20px}
.error-page h1{font-size:5rem;color:var(--primary);line-height:1}
.error-page h2{font-size:1.5rem;margin:16px 0;color:var(--primary-dark)}
.error-page p{color:var(--text-muted);margin-bottom:24px}

/* Footer */
.site-footer{background:var(--primary-dark);color:rgba(255,255,255,.8);padding:48px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:32px}
.footer-brand img{width:56px;border-radius:6px;margin-bottom:12px}
.footer-brand p{font-size:.875rem;line-height:1.6}
.footer-col h4{color:var(--white);margin-bottom:12px;font-size:1rem}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:8px}
.footer-col a{color:rgba(255,255,255,.7);font-size:.875rem}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.15);padding-top:20px;text-align:center;font-size:.8rem;color:rgba(255,255,255,.5)}

/* Sponsor showcase */
.sponsor-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.sponsor-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.sponsor-card img{width:100%;height:160px;object-fit:cover}
.sponsor-card .sponsor-body{padding:16px}
.sponsor-card h3{font-size:1rem;margin-bottom:6px}

/* TOC */
.toc{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:20px 24px;margin-bottom:32px}
.toc h2{font-size:1rem;margin-bottom:12px;color:var(--primary-dark)}
.toc ol{margin-left:20px}
.toc li{margin-bottom:4px;font-size:.9rem}

/* Ads bar */
.ads-bar{background:linear-gradient(180deg,#fff 0%,#f4faf5 100%);border-bottom:1px solid var(--border);padding:14px 0;position:sticky;top:72px;z-index:90;box-shadow:0 2px 8px rgba(0,0,0,.04)}
#ads{display:flex;justify-content:center;align-items:flex-start;flex-wrap:wrap;gap:8px 12px;background:transparent}
#ads>div{display:flex;flex-direction:column;align-items:center;width:80px;box-sizing:border-box}
#ads img{width:72px;height:72px;object-fit:cover;border-radius:16px;box-shadow:0 4px 14px rgba(24,24,24,.12);transition:transform .18s ease,box-shadow .18s ease;display:block;border:2px solid #fff;background:#fff;cursor:pointer}
#ads a{display:inline-block;text-decoration:none;border-radius:16px;line-height:0}
#ads a:hover img,#ads a:focus img{transform:translateY(-3px) scale(1.06);box-shadow:0 8px 22px rgba(26,95,42,.22)}
#ads .caption{height:16px;font-size:11px;color:#555;text-align:center;max-width:80px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-top:6px;line-height:16px}

/* Responsive */
@media(max-width:768px){
  .ads-bar{top:64px;padding:12px 0}
  #ads>div{width:72px}
  #ads img{width:64px;height:64px}
  .nav-main,.nav-cta{display:none}
  .menu-toggle{display:block}
  .nav-main.open{display:flex;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:var(--primary-dark);padding:12px}
  .hero-grid{grid-template-columns:1fr}
  .hero h1{font-size:1.6rem}
  .footer-grid{grid-template-columns:1fr 1fr}
  section{padding:40px 0}
}
@media(max-width:480px){
  .footer-grid{grid-template-columns:1fr}
  .hero-btns{flex-direction:column}
  .hero-btns .btn{text-align:center}
}