:root{color-scheme:light;--bg: #f2f5f8;--card-bg: #ffffff;--text-primary: #203347;--text-secondary: #617487;--border: #d9e2eb;--accent: #245d86;--accent-hover: #194b70;--surface: #edf3f8;--success: #27705e;--warning: #995c17;--radius: 14px;font-family:Segoe UI,Microsoft YaHei,PingFang SC,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text-primary);line-height:1.65;min-width:320px}button,input{font:inherit}button,a,label{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:var(--accent)}svg{flex-shrink:0;vertical-align:middle}:focus-visible{outline:3px solid #397ba9;outline-offset:4px}[hidden]{display:none!important}.skip-link{position:fixed;top:-80px;left:20px;z-index:10;padding:12px 20px;background:var(--accent);color:#fff;border-radius:8px}.skip-link:focus{top:12px}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}.site-header{background:var(--card-bg);border-bottom:1px solid var(--border)}.site-nav{max-width:1080px;margin:auto;padding:16px 28px;display:flex;align-items:center;gap:24px}.back-link{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border:1px solid var(--border);border-radius:8px;text-decoration:none;font-size:13px;font-weight:600;white-space:nowrap}.back-link:hover{background:var(--surface);border-color:var(--accent)}.site-brand{display:inline-flex;align-items:center;gap:8px;color:var(--text-primary);font-size:14px;font-weight:700;text-decoration:none;white-space:nowrap}.site-brand svg{color:var(--accent)}.tool-nav{display:flex;gap:4px;margin-left:auto;padding:4px;background:var(--bg);border-radius:9px}.tool-nav a{padding:7px 12px;border-radius:6px;font-size:13px;text-decoration:none;color:var(--text-secondary);white-space:nowrap}.tool-nav a:hover{color:var(--accent)}.tool-nav a[aria-current]{background:var(--card-bg);color:var(--accent);font-weight:700;box-shadow:0 1px 4px #20334712}.app-container{max-width:960px;margin:auto;padding:44px 28px 20px}.app-container:focus,.card:focus{outline:none}.app-header{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:30px}.eyebrow{color:var(--accent);font-size:12px;letter-spacing:.12em;font-weight:600;margin-bottom:8px}.app-title{font-family:Microsoft YaHei UI,PingFang SC,Segoe 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svg{width:15px;height:15px}.step--active{background:var(--card-bg);color:var(--accent);font-weight:600;box-shadow:inset 0 -3px var(--accent)}.step--active .step__number{background:var(--accent);color:#fff}.step--done .step__number{background:#dcece6;color:var(--success)}.step--done{color:var(--success)}.card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:28px;box-shadow:0 4px 18px #20334704}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px}.section-heading h2{font-size:15px;font-weight:600}.section-heading>span{color:var(--text-secondary);font-size:12px}.upload-zone{padding:36px 20px 30px;border:1.5px dashed #b4c8da;border-radius:10px;background:#f8fafc;text-align:center;transition:background .18s,border-color .18s}.upload-zone:focus-within,.upload-zone--dragover{border-color:var(--accent);background:#edf4fa}.upload-zone__icon{width:60px;height:60px;display:grid;place-items:center;margin:0 auto 18px;border:1px solid #d4e2ee;border-radius:14px;background:#fff;color:var(--accent);box-shadow:4px 4px #e4edf5}.upload-zone__icon svg{width:29px;height:29px}.upload-zone__text{font-size:18px;font-weight:600}.upload-zone__subtext{font-size:13px;color:var(--text-secondary);margin:5px 0 20px}.upload-zone__hint{font-size:12px;color:var(--text-secondary);margin-top:18px}.file-picker{position:relative;overflow:hidden}.file-picker:focus-within{outline:3px solid #397ba9;outline-offset:4px}.file-picker input{position:absolute;inset:0;opacity:0;width:100%;height:100%;cursor:pointer}.upload-notice{display:flex;align-items:flex-start;gap:8px;margin-top:18px;font-size:12px;color:var(--text-secondary)}.upload-notice svg{width:16px;height:16px;margin-top:2px;color:var(--success)}.usage-note{margin-top:24px;padding-top:20px;border-top:1px solid var(--border);display:flex;align-items:baseline;gap:18px;font-size:12px}.usage-note strong{white-space:nowrap;font-weight:600}.usage-note p{color:var(--text-secondary)}.input-feedback{margin-top:12px;color:#ab3e37;font-size:13px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 20px;border:1px solid transparent;border-radius:8px;font-size:14px;font-weight:600;line-height:1.5;text-decoration:none;transition:background .18s,border-color 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