:root{--paper:#f7f7f2;--ink:#203932;--muted:#65746b;--line:#d9dfd6;--accent:#27614e;--pale:#eaf0e5;--warm:#a8643e;--white:#fff;--danger:#a03535;font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button,a,input,label{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.45}button,input,a,label[tabindex]{outline-offset:5px}button:focus-visible,a:focus-visible,label:focus-visible{outline:2px solid var(--accent)}[hidden]{display:none!important}a{color:inherit}button{border:0}.shell{max-width:1120px;margin:auto;padding:0 44px}.masthead{height:108px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-size:23px;font-weight:750;letter-spacing:2px}.brand-mark{height:36px;width:36px;background:var(--accent);color:#fff;border-radius:50%;display:grid;place-items:center;font-size:27px;line-height:1}.brand-en{font-size:10px;font-weight:500;letter-spacing:1.8px;margin-left:8px;color:var(--muted)}.header-note{font-size:12px;display:flex;align-items:center;gap:8px;color:var(--muted)}.dot{width:6px;height:6px;background:var(--accent);border-radius:50%}.intro{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center;padding:76px 0 70px}.eyebrow,.step-label{font-size:11px;letter-spacing:1.5px;font-weight:600;color:var(--muted);margin:0 0 18px}h1{font-size:clamp(36px,4.5vw,56px);line-height:1.35;font-weight:650;letter-spacing:-1.5px;margin:0 0 22px}.intro-copy{color:var(--muted);font-size:14px;line-height:1.9;margin:0}.key-panel{border-top:3px solid var(--accent);background:var(--white);padding:30px 30px 24px;box-shadow:0 12px 35px #20393206}.step-label{display:flex;justify-content:space-between;color:var(--warm);margin-bottom:38px}.step-label span{font-size:20px}.key-panel label{font-size:21px;font-weight:600}.field-hint{font-size:12px;color:var(--muted);line-height:1.7;margin:10px 0 20px}.key-field{display:flex;border-bottom:1px solid var(--ink);padding:6px 0}.key-field input{width:100%;min-width:0;border:0;background:transparent;padding:10px 0;font-size:15px;letter-spacing:.5px;color:var(--ink)}input:focus{outline:0}input::placeholder{color:#9aa49e}.key-field:focus-within{border-bottom:2px solid var(--accent);padding-bottom:5px}.key-field button{flex-shrink:0;background:transparent;color:var(--accent);font-size:13px;font-weight:650;padding:10px 0 10px 12px}.key-field button span{margin-left:10px}.key-note{font-size:11px;color:var(--muted);margin:20px 0 0}.steps{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);padding:32px 0 52px;gap:44px}.step-number{color:var(--warm);font-family:monospace;font-size:12px}.steps h2{font-size:15px;font-weight:650;margin:14px 0 9px}.steps p{font-size:12px;line-height:1.9;color:var(--muted);margin:0}footer{padding:24px 0 30px;border-top:1px solid var(--line);display:flex;justify-content:space-between;color:var(--muted);font-size:10px;letter-spacing:.5px}.notice{margin:0 0 24px;padding:14px 18px;background:var(--pale);border-left:3px solid var(--accent);font-size:13px;line-height:1.7}.notice.error{background:#f6e9e4;border-color:var(--danger);color:var(--danger)}.workspace{margin-bottom:50px;background:var(--white);border:1px solid var(--line);padding:32px}.workspace-heading{display:flex;justify-content:space-between;align-items:center;gap:16px}.workspace-heading .eyebrow{margin-bottom:10px}.workspace h2{font-size:22px;line-height:1.5;margin:0;font-weight:600}.text-button{color:var(--accent);background:transparent;padding:8px 0;font-size:12px;white-space:nowrap}.metrics{display:grid;grid-template-columns:repeat(3,1fr);border-block:1px solid var(--line);padding:21px 0;margin:25px 0}.metrics div:not(:first-child){border-left:1px solid var(--line);padding-left:25px}.metrics dt{font-size:11px;color:var(--muted);margin-bottom:10px}.metrics dd{margin:0;font-size:19px;font-weight:550}.metrics .countdown{font-variant-numeric:tabular-nums}.drop-zone{min-height:148px;border:1px dashed #a7baad;background:#f9fbf7;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;gap:9px;cursor:pointer;text-align:center}.drop-zone:hover,.drop-zone.dragging{border-color:var(--accent);background:var(--pale)}.drop-zone strong{font-size:14px;font-weight:550}.drop-zone>span:last-of-type{color:var(--muted);font-size:11px;line-height:1.7}.drop-symbol{color:var(--accent);font-size:28px;line-height:1.1}.drop-zone.disabled{pointer-events:none;opacity:.5}.file-list{margin-top:15px}.file-row{display:flex;align-items:center;gap:14px;padding:18px 0;border-bottom:1px solid var(--line)}.file-symbol{background:var(--pale);width:33px;height:40px;display:grid;place-items:center;flex-shrink:0;border-radius:3px;color:var(--accent);font-size:16px}.file-detail{min-width:0;flex:1}.file-name{margin:0;font-size:13px;overflow-wrap:anywhere;font-weight:500}.file-meta{margin:6px 0 0;font-size:11px;color:var(--muted)}.file-action{flex-shrink:0;color:var(--accent);font-size:12px;text-decoration:none;background:transparent;padding:8px 0 8px 10px}.file-action[aria-disabled=true]{color:var(--muted);pointer-events:none}.empty{text-align:center;color:var(--muted);padding:20px 0;font-size:12px}.completion{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:25px 0 0}.completion p{font-size:12px;color:var(--muted);line-height:1.8;margin:0}.primary{padding:14px 24px;background:var(--accent);color:var(--white);font-size:13px;border-radius:3px;flex-shrink:0}.primary span{margin-left:18px}.upload-progress{padding:14px 0 4px}.progress-heading{display:flex;justify-content:space-between;align-items:center;font-size:12px;gap:12px}#progress-label{overflow-wrap:anywhere}progress{display:block;width:100%;height:6px;border:0;background:var(--pale);accent-color:var(--accent);margin-top:6px}progress::-webkit-progress-bar{background:var(--pale);border-radius:4px}progress::-webkit-progress-value{background:var(--accent);border-radius:4px}.download-key-panel{padding:22px;background:var(--pale);margin-top:25px}.download-key-panel .eyebrow{font-size:10px;margin-bottom:9px}.download-key-panel label{font-size:15px;font-weight:550}.copy-field{display:flex;gap:10px;margin-top:16px}.copy-field input{flex:1;min-width:0;color:var(--accent);background:transparent;border:0;font-family:monospace;font-size:17px;padding:8px 0}.copy-field input:focus{outline:1px solid var(--accent)}.copy-field button{padding:10px 14px;color:var(--accent);border:1px solid #b0c3ae;background:transparent;border-radius:3px;font-size:12px;flex-shrink:0}.retention-note{font-size:11px;line-height:1.8;color:var(--muted);margin:20px 0 0}
@media(max-width:760px){.shell{padding:0 24px}.masthead{height:80px}.brand-en{display:none}.intro{gap:30px;padding:42px 0;grid-template-columns:1fr}.intro-copy br{display:none}h1{font-size:38px;line-height:1.3;letter-spacing:-.5px;margin-bottom:15px}.intro .eyebrow{margin-bottom:14px}.key-panel{padding:24px}.step-label{margin-bottom:24px}.steps{gap:20px;padding-bottom:34px}.steps h2{font-size:13px}.steps p{font-size:11px}.steps p br{display:none}.workspace{padding:22px 18px}.workspace h2{font-size:18px}.metrics{gap:10px}.metrics div:not(:first-child){padding-left:12px}.metrics dd{font-size:16px}.metrics dt{font-size:10px}.completion p{font-size:11px}.primary{padding:13px 16px}.primary span{margin-left:10px}.copy-field{flex-wrap:wrap}.copy-field input{font-size:15px;flex-basis:100%}.download-key-panel{padding:18px}.header-note{font-size:11px}footer{gap:20px;line-height:1.7}footer span:last-child{text-align:right}}
@media(prefers-reduced-motion:no-preference){button,a{transition:opacity .15s,background .15s}.workspace{animation:appear .25s ease-out}@keyframes appear{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}}