:root{--bg:#ffffff;--bg-card:#ffffff;--bg-elevated:#f9fafb;--border:#e5e7eb;--primary:#00a86b;--primary-light:#10b981;--primary-dark:#047857;--text:#111111;--text-secondary:#6b7280;--text-tertiary:#9ca3af;--accent:#f59e0b}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:-apple-system,PingFang SC,Microsoft YaHei,sans-serif;background:#f9fafb;color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased}nav{position:-webkit-sticky;position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);padding:14px 24px}.nav-inner{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center}.logo{gap:8px;font-size:18px;font-weight:800;color:var(--text);text-decoration:none}.logo,.logo-icon{display:inline-flex;align-items:center}.logo-icon{justify-content:center;width:28px;height:28px;border-radius:6px;background:linear-gradient(135deg,#1f2937,#000000);color:#fff;font-weight:900;font-size:13px;position:relative}.logo-icon:after{content:"";position:absolute;top:3px;right:3px;width:4px;height:4px;border-radius:50%;background:#00a86b}.logo-text-pro{background:linear-gradient(135deg,#b8860b,#d4af37);-webkit-background-clip:text;background-clip:text;color:transparent}.nav-links{display:flex;gap:24px;align-items:center}.nav-links a{color:var(--text-secondary);text-decoration:none;font-size:14px}.nav-links a:hover{color:var(--primary)}.hamburger{display:none;background:none;border:none;cursor:pointer;padding:8px}.hamburger span{display:block;width:22px;height:2px;background:var(--text);border-radius:2px;transition:all .25s}.hamburger span+span{margin-top:5px}.hamburger.open span:first-child{transform:translateY(7px) rotate(45deg)}.hamburger.open span:nth-child(2){opacity:0}.hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}@media (max-width:768px){.hamburger{display:block}.nav-links{position:fixed;top:60px;left:0;right:0;flex-direction:column;background:rgba(255,255,255,.97);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-bottom:1px solid var(--border);padding:16px 24px;gap:0!important;max-height:0;overflow:hidden;transition:all .3s}.nav-links.open{max-height:400px;padding:16px 24px}.nav-links a{display:block!important;padding:14px 0;border-bottom:1px solid var(--border);font-size:15px}.nav-links a:last-child{border-bottom:none}}.breadcrumb-nav{max-width:900px;margin:0 auto;padding:16px 24px 0;font-size:13px;color:#9ca3af}.breadcrumb-nav a{color:#6b7280;text-decoration:none}.breadcrumb-nav .sep{margin:0 8px;color:#d1d5db}.hero{padding:60px 24px 30px;text-align:center;background:linear-gradient(180deg,#f0fdf4,#ffffff)}.hero h1{font-size:36px;font-weight:800;margin-bottom:12px}.hero p{color:var(--text-secondary);font-size:16px;max-width:600px;margin:0 auto}.help-banner{max-width:900px;margin:24px auto 0;padding:0 24px}.help-banner-inner{background:linear-gradient(135deg,#fef3c7,#fff);border:1px solid #fcd34d;border-radius:12px;padding:16px 20px;display:flex;align-items:center;gap:12px}.help-banner-icon{width:40px;height:40px;background:#fff;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}.help-banner-content{flex:1 1;font-size:14px;color:var(--text)}.help-banner-content strong{color:var(--text)}.help-banner-link{color:var(--primary-dark);font-weight:700;text-decoration:none;white-space:nowrap}section{padding:30px 24px 60px}.section-inner{max-width:900px;margin:0 auto}.category-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:32px;padding:8px;background:#fff;border:1px solid var(--border);border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,.04)}.category-tab{flex:1 1;min-width:100px;background:transparent;border:none;padding:10px 14px;border-radius:8px;cursor:pointer;font-size:13px;font-weight:600;color:var(--text-secondary);transition:all .2s;text-align:center}.category-tab:hover{color:var(--primary)}.category-tab.active{background:var(--primary);color:#fff}.category-tab .count{display:inline-block;background:rgba(255,255,255,.2);color:inherit;font-size:11px;padding:1px 6px;border-radius:10px;margin-left:4px;font-weight:700}.category-tab:not(.active) .count{background:rgba(0,168,107,.1);color:var(--primary-dark)}.faq-section{margin-bottom:40px}.faq-section.hidden{display:none}.faq-section h2{font-size:22px;font-weight:800;margin-bottom:16px;color:var(--text);display:flex;align-items:center;gap:10px}.faq-section h2 .icon{width:36px;height:36px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:18px}.faq-section h2 .badge,.faq-section h2 .icon{background:rgba(0,168,107,.08);color:var(--primary-dark)}.faq-section h2 .badge{padding:2px 10px;border-radius:12px;font-size:12px;font-weight:600;margin-left:auto}.faq-item{background:#fff;border:1px solid var(--border);border-radius:10px;margin-bottom:8px;overflow:hidden;transition:all .2s;box-shadow:0 1px 2px rgba(0,0,0,.02)}.faq-item:hover{border-color:var(--primary-light)}.faq-item summary{padding:18px 20px;cursor:pointer;font-size:15px;font-weight:600;color:var(--text);list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary:after{content:"+";font-size:22px;color:var(--primary);font-weight:300;flex-shrink:0;transition:transform .2s}.faq-item[open] summary:after{content:"−"}.faq-item .answer{padding:0 20px 18px;color:var(--text-secondary);font-size:14px;line-height:1.85}.faq-item .answer strong{color:var(--text)}.faq-item .answer a{color:var(--primary-dark)}.faq-item .answer p+p{margin-top:8px}.contact-block{margin-top:60px;padding:32px;background:linear-gradient(135deg,#f0fdf4,#fff);border:1px solid #d1fae5;border-radius:16px;text-align:center}.contact-block h3{font-size:22px;font-weight:800;margin-bottom:8px}.contact-block p{color:var(--text-secondary);margin-bottom:20px}.contact-buttons{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.btn-primary{background:var(--primary);color:#fff;padding:12px 28px;border-radius:8px;text-decoration:none;font-weight:700;display:inline-block}.btn-primary:hover{background:var(--primary-dark)}.btn-secondary{background:#fff;color:var(--text);padding:12px 28px;border-radius:8px;text-decoration:none;font-weight:700;display:inline-block;border:1px solid var(--border)}.btn-secondary:hover{border-color:var(--primary);color:var(--primary-dark)}footer{background:#f9fafb;border-top:1px solid var(--border);padding:30px 24px 20px;font-size:12px;text-align:center}footer,footer a{color:var(--text-secondary)}footer a{text-decoration:none;margin:0 8px}footer a:hover{color:var(--primary)}@media (max-width:768px){.hero h1{font-size:26px}.help-banner-inner{align-items:flex-start}.category-tabs,.help-banner-inner{flex-direction:column}.category-tab{flex:none;width:100%}}