:root{--bg: #f4f7fb;--surface: #ffffff;--text: #1f2937;--text-muted: #6b7280;--primary: #2563eb;--primary-dark: #1d4ed8;--border: #e5e7eb;--shadow: 0 10px 30px rgba(15, 23, 42, .08);--radius: 16px}*{box-sizing:border-box}html,body,#app{min-height:100%}body{margin:0;font-family:Noto Sans SC,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:var(--text);background:linear-gradient(180deg,#eef4ff 0%,var(--bg) 40%,var(--bg) 100%);line-height:1.7}a{color:var(--primary);text-decoration:none}a:hover{color:var(--primary-dark)}.app-shell{min-height:100vh;display:flex;flex-direction:column}.app-main{flex:1;width:min(1080px,calc(100% - 32px));margin:0 auto;padding:24px 0 48px}.app-footer{text-align:center;padding:24px 16px 32px;color:var(--text-muted);font-size:14px}.app-footer p{margin:4px 0}.site-header{position:sticky;top:0;z-index:10;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffffe0;border-bottom:1px solid var(--border)}.header-inner{width:min(1080px,calc(100% - 32px));margin:0 auto;padding:14px 0;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{display:flex;align-items:center;gap:12px;color:inherit}.brand-icon{width:42px;height:42px;border-radius:12px;object-fit:cover;flex-shrink:0;box-shadow:0 4px 12px #0f172a1f}.brand-text{display:flex;flex-direction:column;line-height:1.3}.brand-text strong{font-size:18px}.brand-text small{color:var(--text-muted);font-size:13px}.site-nav{display:flex;gap:8px;flex-wrap:wrap}.nav-link{padding:8px 14px;border-radius:999px;color:var(--text-muted);font-size:14px;transition:all .2s ease}.nav-link:hover,.nav-link.active{color:var(--primary);background:#eff6ff}.home-page{display:flex;flex-direction:column;gap:24px}.home-hero,.legal-hero,.home-contact,.legal-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.home-hero,.legal-hero,.home-contact{padding:28px 32px}.home-hero h1,.legal-hero h1{margin:0 0 12px;font-size:clamp(28px,4vw,36px);line-height:1.25}.home-hero p,.legal-subtitle{margin:0;color:var(--text-muted)}.home-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}.home-card{display:flex;flex-direction:column;gap:10px;padding:24px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);color:inherit;transition:transform .2s ease,box-shadow .2s ease}.home-card:hover{transform:translateY(-2px);box-shadow:0 16px 36px #0f172a1f}.home-card-tag{align-self:flex-start;padding:4px 10px;border-radius:999px;background:#eff6ff;color:var(--primary);font-size:12px;font-weight:600}.home-card h2{margin:0;font-size:22px}.home-card p{margin:0;color:var(--text-muted);flex:1}.home-card-link{color:var(--primary);font-weight:600}.home-contact h3{margin:0 0 8px}.home-contact ul{margin:12px 0 0;padding-left:20px}.legal-page{display:flex;flex-direction:column;gap:20px}.legal-badge{display:inline-block;margin:0 0 10px;padding:4px 10px;border-radius:999px;background:#eff6ff;color:var(--primary);font-size:12px;font-weight:600}.legal-meta{display:flex;flex-wrap:wrap;gap:10px 18px;margin-top:16px;color:var(--text-muted);font-size:14px}.legal-card{padding:28px 32px}.legal-content h2{margin:28px 0 12px;padding-top:8px;font-size:20px;border-top:1px solid #f1f5f9}.legal-content h3,.legal-content h4{margin:20px 0 10px;font-size:17px}.legal-content a{color:var(--primary);text-decoration:underline;text-underline-offset:2px}.legal-back{display:inline-flex;align-items:center;gap:6px;margin-bottom:12px;color:var(--text-muted);font-size:14px}.legal-back:hover{color:var(--primary)}.legal-content h2:first-child{margin-top:0;padding-top:0;border-top:none}.legal-content p,.legal-content li{color:#374151}.legal-content ul,.legal-content ol{padding-left:22px}.tutorial-page{display:flex;flex-direction:column;gap:20px}.tutorial-card{padding:28px 32px}.tutorial-heading{margin:0 0 16px;font-size:20px;color:var(--text)}.tutorial-section+.tutorial-section{margin-top:36px;padding-top:28px;border-top:1px solid #f1f5f9}.tutorial-guide-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}.tutorial-guide-card{display:flex;flex-direction:column;gap:8px;padding:18px;border:1px solid var(--border);border-radius:14px;background:#f8fafc;color:inherit;transition:border-color .2s ease,background .2s ease}.tutorial-guide-card:hover{border-color:#bfdbfe;background:#eff6ff}.tutorial-guide-card h3{margin:0;font-size:16px}.tutorial-guide-card p{margin:0;flex:1;color:var(--text-muted);font-size:14px}.tutorial-guide-card span{color:var(--primary);font-size:14px;font-weight:600}.tutorial-faq-list{display:flex;flex-direction:column}.tutorial-faq-item{border-bottom:1px solid #f1f5f9}.tutorial-faq-item:last-child{border-bottom:none}.tutorial-faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 0;border:0;background:transparent;text-align:left;color:var(--text);font-size:15px;line-height:1.5;cursor:pointer}.tutorial-faq-arrow{flex-shrink:0;color:var(--text-muted);transition:transform .2s ease}.tutorial-faq-item.open .tutorial-faq-arrow{transform:rotate(180deg);color:var(--primary)}.tutorial-faq-a{margin:0 0 16px;padding:14px 16px;border-radius:12px;background:#f5f5f5;color:#666;font-size:14px;line-height:1.7}.tutorial-faq-a p{margin:0}.tutorial-step{margin-bottom:22px}.tutorial-step:last-child{margin-bottom:0}.tutorial-step-text{margin:0 0 12px;color:#374151;font-size:15px;line-height:1.75}.tutorial-step-text span{color:var(--primary);font-weight:600}.tutorial-step-img{display:block;width:min(100%,420px);margin:0 auto 8px;border-radius:12px;border:1px solid var(--border);background:#fff}@media(max-width:720px){.header-inner{flex-direction:column;align-items:flex-start}.home-hero,.legal-hero,.home-contact,.legal-card,.tutorial-card{padding:20px}}