*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:linear-gradient(135deg,#f0f5ff 0%,#e6f0ff 100%);color:#1a2b4a;line-height:1.7;min-height:100vh}
a{color:#2563eb;text-decoration:none;transition:color .2s}
a:hover{color:#1d4ed8}
header a{color:#fff}
header a:hover{color:#fff}
img{max-width:100%;display:block}
.container{max-width:1180px;margin:0 auto;padding:0 20px}
header{background:linear-gradient(135deg,#1e40af 0%,#2563eb 50%,#3b82f6 100%);color:#fff;padding:18px 0;position:sticky;top:0;z-index:100;box-shadow:0 4px 20px rgba(37,99,235,.18)}
.nav{display:flex;align-items:center;justify-content:space-between}
.logo{font-size:22px;font-weight:700;letter-spacing:.5px;display:flex;align-items:center;gap:8px;color:#fff}
.logo-icon{width:36px;height:36px;background:#fff;color:#2563eb;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:800}
.nav-menu{display:flex;gap:28px;list-style:none}
.nav-menu a{color:#fff;font-size:14px;font-weight:500;opacity:.92}
.nav-menu a:hover{opacity:1;color:#fff}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:6px;flex-direction:column;gap:5px;width:36px;height:36px;justify-content:center;align-items:center}
.nav-toggle span{display:block;width:22px;height:2px;background:#fff;border-radius:2px;transition:all .3s}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.hero{padding:70px 0 50px;text-align:center;background:radial-gradient(ellipse at top,rgba(59,130,246,.12) 0%,transparent 60%)}
.hero h1{font-size:42px;font-weight:700;margin-bottom:18px;background:linear-gradient(135deg,#1e40af,#3b82f6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1.3}
.hero p.lead{font-size:18px;color:#4a5d80;max-width:720px;margin:0 auto 32px}
.tool-card{background:#fff;border-radius:20px;padding:40px;box-shadow:0 20px 60px rgba(37,99,235,.12);max-width:880px;margin:0 auto;border:1px solid rgba(59,130,246,.1)}
.upload-zone{border:2px dashed #93c5fd;border-radius:16px;padding:50px 30px;text-align:center;cursor:pointer;transition:all .3s;background:linear-gradient(135deg,#f0f7ff 0%,#e6f0ff 100%)}
.upload-zone:hover,.upload-zone.dragover{border-color:#2563eb;background:linear-gradient(135deg,#e0edff 0%,#d1e3ff 100%);transform:translateY(-2px)}
.upload-icon{width:72px;height:72px;margin:0 auto 18px;background:linear-gradient(135deg,#2563eb,#3b82f6);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:32px;box-shadow:0 8px 24px rgba(37,99,235,.3)}
.upload-zone h3{font-size:20px;color:#1e40af;margin-bottom:8px}
.upload-zone p{color:#6b7a99;font-size:14px}
.btn-primary{display:inline-block;background:linear-gradient(135deg,#2563eb 0%,#3b82f6 100%);color:#fff;border:none;padding:14px 36px;border-radius:10px;font-size:16px;font-weight:600;cursor:pointer;transition:all .2s;box-shadow:0 8px 20px rgba(37,99,235,.25);margin-top:18px}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(37,99,235,.35)}
.btn-primary:disabled{background:#94a3b8;cursor:not-allowed;transform:none;box-shadow:none}
.file-list{margin-top:24px;text-align:left}
.file-item{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:#f8faff;border-radius:10px;margin-bottom:10px;border:1px solid #e0eaff}
.file-info{display:flex;align-items:center;gap:12px;flex:1;min-width:0}
.file-icon{width:36px;height:36px;background:#fee2e2;color:#dc2626;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;flex-shrink:0}
.file-name{font-size:14px;color:#1a2b4a;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file-size{font-size:12px;color:#6b7a99;flex-shrink:0;margin-left:12px}
.file-remove{background:none;border:none;color:#94a3b8;cursor:pointer;font-size:18px;padding:4px 8px}
.file-remove:hover{color:#dc2626}
.progress-wrap{margin-top:20px}
.progress-bar{height:8px;background:#e0eaff;border-radius:4px;overflow:hidden}
.progress-fill{height:100%;background:linear-gradient(90deg,#2563eb,#3b82f6);width:0%;transition:width .3s;border-radius:4px}
.progress-text{text-align:center;color:#4a5d80;font-size:14px;margin-top:10px}
.download-section{margin-top:24px;padding:22px;background:linear-gradient(135deg,#f0f7ff 0%,#e6f0ff 100%);border-radius:14px;border:1px solid #bfdbfe;text-align:left}
.download-title{font-size:16px;font-weight:600;color:#1e40af;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.download-title::before{content:"✓";width:22px;height:22px;background:#2563eb;color:#fff;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-size:13px}
.download-item{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;background:#fff;border-radius:10px;margin-bottom:8px;border:1px solid #e0eaff}
.download-item:last-child{margin-bottom:0}
.download-info{display:flex;align-items:center;gap:12px;flex:1;min-width:0}
.download-icon{width:36px;height:36px;background:#dbeafe;color:#2563eb;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex-shrink:0}
.download-name{font-size:14px;color:#1a2b4a;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.btn-download{background:linear-gradient(135deg,#2563eb,#3b82f6);color:#fff;border:none;padding:8px 16px;border-radius:8px;font-size:13px;font-weight:600;cursor:pointer;transition:all .2s;display:inline-flex;align-items:center;gap:6px;flex-shrink:0;margin-left:12px}
.btn-download:hover{transform:translateY(-1px);box-shadow:0 6px 14px rgba(37,99,235,.25)}
.download-all-wrap{text-align:center;margin-top:14px}
.btn-download-all{background:linear-gradient(135deg,#1e40af,#2563eb);color:#fff;border:none;padding:12px 28px;border-radius:10px;font-size:14px;font-weight:600;cursor:pointer;transition:all .2s;box-shadow:0 8px 20px rgba(37,99,235,.25)}
.btn-download-all:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(37,99,235,.35)}
.features-section{padding:80px 0}
.section-title{text-align:center;font-size:32px;font-weight:700;color:#1e40af;margin-bottom:14px}
.section-sub{text-align:center;color:#6b7a99;margin-bottom:50px;font-size:16px}
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px}
.feature-card{background:#fff;padding:32px 26px;border-radius:16px;border:1px solid #e0eaff;transition:all .3s;text-align:center}
.feature-card:hover{transform:translateY(-6px);box-shadow:0 16px 40px rgba(37,99,235,.12);border-color:#93c5fd}
.feature-icon{width:60px;height:60px;background:linear-gradient(135deg,#dbeafe,#bfdbfe);color:#2563eb;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:26px;margin:0 auto 18px}
.feature-card h3{font-size:18px;color:#1e40af;margin-bottom:10px}
.feature-card p{color:#6b7a99;font-size:14px;line-height:1.7}
.steps-section{padding:80px 0;background:#fff}
.steps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px;margin-top:40px}
.step-card{text-align:center;padding:24px;position:relative}
.step-num{width:54px;height:54px;background:linear-gradient(135deg,#2563eb,#3b82f6);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:700;margin:0 auto 18px;box-shadow:0 8px 20px rgba(37,99,235,.25)}
.step-card h4{color:#1e40af;font-size:17px;margin-bottom:10px}
.step-card p{color:#6b7a99;font-size:14px}
.faq-section{padding:80px 0}
.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:#fff;border-radius:12px;padding:22px 26px;margin-bottom:14px;border:1px solid #e0eaff;cursor:pointer;transition:all .2s}
.faq-item:hover{border-color:#93c5fd}
.faq-q{display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#1e40af;font-size:16px}
.faq-q::after{content:"+";font-size:22px;color:#3b82f6;transition:transform .2s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s;color:#4a5d80;font-size:14px;line-height:1.8}
.faq-item.open .faq-a{max-height:300px;padding-top:14px}
.cta-section{padding:80px 0;text-align:center;background:linear-gradient(135deg,#1e40af 0%,#3b82f6 100%);color:#fff}
.cta-section h2{font-size:34px;margin-bottom:14px}
.cta-section p{font-size:17px;opacity:.92;margin-bottom:28px;max-width:640px;margin-left:auto;margin-right:auto}
.btn-white{background:#fff;color:#1e40af;padding:14px 36px;border-radius:10px;font-weight:600;display:inline-block;border:none;cursor:pointer;font-size:16px;transition:all .2s;box-shadow:0 8px 20px rgba(0,0,0,.15)}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(0,0,0,.2)}
footer{background:#0f1e3d;color:#94a3b8;padding:50px 0 24px}
.footer-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;margin-bottom:30px;text-align:left}
.footer-col{padding:0 8px}
.footer-col h4{color:#fff;font-size:16px;margin-bottom:14px}
.footer-col a,.footer-col p{display:block;color:#94a3b8;font-size:14px;margin-bottom:8px;line-height:1.8}
.footer-col a:hover{color:#60a5fa}
.footer-col.links-2col a{display:block}
.footer-col.links-2col{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}
.footer-col.links-3col{display:grid;grid-template-columns:1fr 1fr 1fr;gap:0 14px}
.footer-col.links-3col a{display:block}
.footer-col.tight h4{margin-bottom:6px}
.footer-col.tight a{margin-bottom:4px;line-height:1.6}
.footer-col.loose a{margin-bottom:14px}
.footer-col.links-3col{padding-left:0;margin-left:-30px}
.copyright{text-align:center;padding-top:24px;border-top:1px solid #1e2d4f;font-size:13px;color:#64748b}
@media(max-width:768px){
.hero h1{font-size:30px}
.hero p.lead{font-size:16px}
.tool-card{padding:24px}
.upload-zone{padding:30px 18px}
.nav-toggle{display:flex}
.nav-menu{position:absolute;top:100%;left:0;right:0;background:linear-gradient(135deg,#1e40af 0%,#2563eb 100%);flex-direction:column;gap:0;padding:0;max-height:0;overflow:hidden;transition:max-height .3s ease;box-shadow:0 8px 20px rgba(0,0,0,.15)}
.nav-menu.open{max-height:320px;padding:8px 0 16px}
.nav-menu li{width:100%;text-align:center;border-bottom:1px solid rgba(255,255,255,.1)}
.nav-menu li:last-child{border-bottom:none}
.nav-menu a{display:block;padding:14px 20px;font-size:15px}
.section-title{font-size:24px}
.cta-section h2{font-size:24px}
.footer-grid{grid-template-columns:1fr;gap:28px;text-align:center}
.footer-col.tight{margin-bottom:-16px}
.footer-col{padding:0}
.footer-col.links-2col{grid-template-columns:1fr;gap:0}
.footer-col.links-3col{grid-template-columns:1fr;gap:0}
.footer-col.links-2col h4{grid-column:1}
.footer-col.links-3col h4{grid-column:1}
.footer-col a,.footer-col p{font-size:15px;padding:4px 0}
.copyright{padding-top:20px;font-size:12px;line-height:1.6}
}
@media(max-width:480px){
.hero{padding:50px 0 36px}
.hero h1{font-size:26px}
.hero p.lead{font-size:15px;margin-bottom:24px}
.btn-primary{padding:12px 26px;font-size:15px}
.upload-zone{padding:24px 14px}
.upload-icon{width:60px;height:60px;font-size:28px}
footer{padding:40px 0 20px}
}