:root{--primary:#2563eb;--primary-dark:#1d4ed8;--primary-050:#eff6ff;--accent:#f97316;--text:#0f172a;--text-muted:#64748b;--text-muted-blakc:#0f1b2c;--border:#e2e8f0;--bg:#ffffff;--bg-soft:#f8fafc;--success:#16a34a;--danger:#dc2626;--radius:12px;--shadow-sm:0 1px 2px rgba(15,23,42,.06),0 1px 3px rgba(15,23,42,.08);--shadow-md:0 4px 6px -1px rgba(15,23,42,.08),0 2px 4px -2px rgba(15,23,42,.06);--shadow-lg:0 10px 15px -3px rgba(15,23,42,.1),0 4px 6px -4px rgba(15,23,42,.08);--container:1120px;--font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans 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a{color:var(--text-muted);font-weight:500}.nav-links a:hover{color:var(--primary);text-decoration:none}.lang-switch{font-size:13px;border:1px solid var(--border);border-radius:999px;padding:4px 12px;color:var(--text-muted);font-weight:500}.lang-switch:hover{border-color:var(--primary);color:var(--primary);text-decoration:none}.hero{text-align:center;padding:56px 0 32px;background:linear-gradient(180deg,var(--primary-050),var(--bg))}.hero h1{font-size:clamp(28px,4.4vw,24px);line-height:1.2;font-weight:800;letter-spacing:-.02em;margin-bottom:14px}.hero h1 em{font-style:normal;color:var(--primary)}.hero .lead{font-size:clamp(15px,2.2vw,18px);color:var(--text-muted);max-width:680px;margin:0 auto 28px}.tool-card{background:#fff;border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow-md);max-width:700px;margin:0 auto;padding:28px 12px;text-align:left}.tabs{display:flex;gap:8px;flex-wrap:wrap;border-bottom:1px solid var(--border);padding-bottom:14px;margin-bottom:18px}.tab{font:inherit;font-weight:600;font-size:14px;color:var(--text-muted-blakc);border:1px solid transparent;border-radius:999px;padding:8px 16px;cursor:pointer}.tab:hover{color:var(--primary);background:var(--primary-050)}.tab.active{color:#fff;background:var(--primary)}.drop-zone{border:2px dashed #cbd5e1;border-radius:var(--radius);padding:40px 20px;text-align:center;cursor:pointer;transition:all .2s;background:var(--bg-soft)}.drop-zone:hover,.drop-zone.dragover{border-color:var(--primary);background:var(--primary-050)}.drop-zone .dz-icon{width:56px;height:56px;margin:0 auto 12px;color:var(--primary)}.drop-zone p{color:var(--text-muted);font-size:14px}.drop-zone strong{color:var(--text)}.file-list{margin-top:16px;display:grid;gap:8px}.file-item{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--bg-soft);border:1px solid var(--border);border-radius:8px;padding:8px 14px;font-size:14px}.file-item .fname{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-item .fsize{color:var(--text-muted);flex-shrink:0;font-size:12px}.file-item button{border:0;background:none;color:var(--danger);cursor:pointer;font-size:14px}.options{margin-top:18px;display:grid;gap:14px}.opt-row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.opt-row label{font-size:14px;color:var(--text);font-weight:500}.opt-row select,.opt-row input[type="range"]{font:inherit;color:var(--text)}select,input[type="text"],input[type="number"],input[type="password"],textarea{font:inherit;color:var(--text);border:1px solid var(--border);border-radius:8px;padding:8px 12px;background:#fff;min-width:0}textarea{width:100%;resize:vertical;line-height:1.5}select:focus,input:focus,textarea:focus{outline:2px solid var(--primary);outline-offset:1px;border-color:var(--primary)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:inherit;font-weight:600;font-size:15px;background:var(--primary);color:#fff;border:0;border-radius:10px;padding:12px 22px;cursor:pointer;transition:background .15s,transform .05s}.btn:hover{background:var(--primary-dark);text-decoration:none}.btn:active{transform:scale(.98)}.btn:disabled{background:#94a3b8;cursor:not-allowed}.btn-lg{width:100%;padding:14px;font-size:16px;margin-top:20px}.btn-ghost{background:#fff;color:var(--primary);border:1px solid var(--primary)}.btn-ghost:hover{background:var(--primary-050)}.btn-sm{padding:8px 14px;font-size:13px}.progress-bar{height:8px;background:var(--border);border-radius:999px;overflow:hidden;margin-top:16px;display:none}.progress-bar > div{height:100%;width:0;background:var(--primary);border-radius:999px;transition:width 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var(--border);border-radius:12px;overflow:hidden;background:#fff}.faq-item details > summary{cursor:pointer;padding:16px 20px;font-weight:600;font-size:15.5px;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}.faq-item details > summary::-webkit-details-marker{display:none}.faq-item details > summary::after{content:"+";font-size:20px;color:var(--primary);font-weight:700;transition:transform .2s}.faq-item details[open] > summary::after{transform:rotate(45deg)}.faq-item details > div{padding:0 20px 18px;color:var(--text-muted);font-size:14.5px}.faq-item details > div p{margin-bottom:8px}.faq-item details > div p:last-child{margin-bottom:0}.related-links{display:flex;flex-wrap:wrap;justify-content:center;gap:10px}.related-links a{border:1px solid var(--border);border-radius:999px;padding:8px 16px;font-size:13.5px;color:var(--text-muted);font-weight:500;background:#fff}.related-links a:hover{color:var(--primary);border-color:var(--primary);text-decoration:none}.prose{max-width:780px;margin:0 auto}.prose h2{text-align:left;font-size:24px;margin:36px 0 14px}.prose h3{font-size:19px;margin:28px 0 10px}.prose p{margin-bottom:14px;color:#334155}.prose ul,.prose ol{margin-bottom:16px;color:#334155}.prose table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px}.prose th,.prose td{border:1px solid var(--border);padding:10px 12px;text-align:left}.prose th{background:var(--bg-soft);font-weight:600}.prose code{background:var(--bg-soft);border:1px solid var(--border);border-radius:6px;padding:2px 6px;font-size:.9em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}.breadcrumb{font-size:13px;color:var(--text-muted);padding:16px 0 0}.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;padding:0}.breadcrumb li:not(:last-child)::after{content:"/";margin-left:6px;color:#cbd5e1}.breadcrumb a{color:var(--text-muted)}.breadcrumb 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p{color:var(--text-muted)}@media (max-width:768px){#pdf2word-mode{width:100%;}.opt-row{justify-content: center;}.hero{padding:40px 0 24px}.tool-card{padding:10px}.nav-links{gap:12px}.footer-grid{grid-template-columns:1fr;gap:24px;padding:36px 0 20px}.footer-bottom{flex-direction:column;text-align:center}}.text-muted{color:var(--text-muted)}.center{text-align:center}.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.hidden{display:none !important}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}