*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f8fafc;--surface: #ffffff;--primary: #1d4ed8;--primary-hover: #1e40af;--primary-light: #3b82f6;--primary-subtle: #eff6ff;--text: #0f172a;--text-secondary: #334155;--text-muted: #64748b;--border: #e2e8f0;--border-strong: #cbd5e1;--success: #059669;--success-bg: #f0fdf4;--success-border: #a7f3d0;--error: #dc2626;--error-bg: #fef2f2;--error-border: #fecaca;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow: 0 4px 6px -1px rgb(0 0 0 / .08), 0 2px 4px -2px rgb(0 0 0 / .05);--shadow-lg: 0 10px 25px -5px rgb(0 0 0 / .08), 0 8px 10px -6px rgb(0 0 0 / .04);--radius-sm: 8px;--radius: 12px;--radius-lg: 16px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Helvetica, sans-serif}html{scroll-behavior:smooth}body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;display:flex;flex-direction:column;-webkit-font-smoothing:antialiased}a{color:var(--primary)}.site-header{position:sticky;top:0;z-index:100;background:#ffffffeb;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);padding:0 2rem;height:64px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text)}.brand-icon{width:36px;height:36px;background:var(--primary);border-radius:10px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.brand-icon svg{width:20px;height:20px;color:#fff}.brand-name{font-size:1.15rem;font-weight:700;letter-spacing:-.02em}.brand-name span{color:var(--primary)}.header-badge{display:inline-flex;align-items:center;gap:6px;background:var(--success-bg);border:1px solid 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svg{width:14px;height:14px;color:var(--success)}.trust-chip .icon-bolt{color:var(--primary-light)}.trust-chip .icon-check{color:var(--success)}main{flex:1;width:100%;max-width:720px;margin:2.5rem auto;padding:0 1.5rem 4rem}.app-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);overflow:hidden}.card-section{padding:1.75rem}.card-section+.card-section{border-top:1px solid var(--border)}.section-label{font-size:.68rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);margin-bottom:1rem}.drop-zone{border:2px dashed var(--border-strong);border-radius:var(--radius);background:var(--bg);padding:2.5rem 1.5rem;text-align:center;cursor:pointer;transition:border-color .2s,background .2s,transform .1s;-webkit-user-select:none;user-select:none}.drop-zone:hover{border-color:var(--primary-light);background:var(--primary-subtle)}.drop-zone.drag-over{border-color:var(--primary);background:var(--primary-subtle);transform:scale(1.006)}.drop-zone:focus-visible{outline:none;border-color:var(--primary);box-shadow:0 0 0 4px #3b82f62e}.drop-icon{width:52px;height:52px;background:var(--primary-subtle);border:1.5px solid #bfdbfe;border-radius:14px;display:inline-flex;align-items:center;justify-content:center;margin-bottom:1rem;transition:transform .2s}.drop-zone:hover .drop-icon{transform:translateY(-3px)}.drop-icon svg{width:24px;height:24px;color:var(--primary)}.drop-zone h2{font-size:1.05rem;font-weight:700;margin-bottom:.35rem;letter-spacing:-.01em}.drop-zone p{color:var(--text-muted);font-size:.85rem}.drop-zone input{display:none}.file-list{margin-top:1rem;border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden}.file-item{display:flex;align-items:center;gap:.75rem;padding:.65rem .9rem;background:var(--surface);border-bottom:1px solid var(--border);transition:background .12s}.file-item:last-child{border-bottom:none}.file-item:hover{background:var(--bg)}.file-order{width:22px;height:22px;border-radius:50%;background:var(--bg);border:1px solid var(--border);font-size:.7rem;font-weight:700;color:var(--text-muted);display:flex;align-items:center;justify-content:center;flex-shrink:0}.file-thumb{width:38px;height:38px;flex-shrink:0;border:1px solid var(--border);border-radius:8px;background:var(--bg);display:flex;align-items:center;justify-content:center;overflow:hidden}.file-thumb img{width:100%;height:100%;object-fit:cover}.file-thumb svg{width:18px;height:18px;color:var(--primary-light)}.file-info{flex:1;min-width:0}.file-name{font-weight:600;font-size:.875rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--text)}.file-meta{font-size:.72rem;color:var(--text-muted);margin-top:1px}.file-type-badge{display:inline-block;background:var(--primary-subtle);color:var(--primary);border-radius:4px;padding:1px 5px;font-size:.67rem;font-weight:700;letter-spacing:.03em;margin-right:4px}.file-remove{flex-shrink:0;width:28px;height:28px;border:1px solid transparent;background:transparent;color:var(--text-muted);font-size:1.1rem;line-height:1;border-radius:6px;cursor:pointer;transition:background .15s,color .15s,border-color .15s;display:flex;align-items:center;justify-content:center}.file-remove:hover{background:var(--error-bg);color:var(--error);border-color:var(--error-border)}.file-remove:focus-visible{outline:none;box-shadow:0 0 0 3px #3b82f640}.field{display:flex;flex-direction:column;gap:.45rem}.field label{font-size:.8rem;font-weight:700;color:var(--text-secondary);letter-spacing:.01em}.input-wrap{position:relative}.input-suffix{position:absolute;right:.85rem;top:50%;transform:translateY(-50%);font-size:.8rem;color:var(--text-muted);pointer-events:none;font-weight:500}.field input[type=text]{width:100%;padding:.72rem 3rem .72rem .9rem;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:.9rem;color:var(--text);background:var(--surface);font-family:var(--font);transition:border-color .15s,box-shadow .15s}.field input[type=text]:focus-visible{outline:none;border-color:var(--primary-light);box-shadow:0 0 0 3px #3b82f626}.btn-merge{width:100%;padding:.95rem 1.5rem;border:none;border-radius:var(--radius-sm);background:var(--primary);color:#fff;font-size:.975rem;font-weight:700;cursor:pointer;letter-spacing:-.01em;font-family:var(--font);transition:background .15s,transform .1s,box-shadow 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var(--border);display:none}.progress-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.65rem}.progress-label{font-size:.8rem;font-weight:600;color:var(--text-secondary)}.progress-pct{font-size:.8rem;font-weight:700;color:var(--primary)}.progress-track{height:6px;background:var(--border);border-radius:4px;overflow:hidden}.progress-bar{height:100%;width:0%;background:linear-gradient(90deg,var(--primary),var(--primary-light));border-radius:4px;transition:width .35s ease}.alert{display:none;padding:.85rem 1rem;border-radius:var(--radius-sm);font-size:.875rem;font-weight:500;line-height:1.5;margin-top:1rem}.alert-error{background:var(--error-bg);color:var(--error);border:1px solid var(--error-border)}.alert-success{background:var(--success-bg);color:var(--success);border:1px solid var(--success-border)}.features{margin-top:2.5rem}.section-title{font-size:1.15rem;font-weight:800;letter-spacing:-.03em;color:var(--text);text-align:center;margin-bottom:1.25rem}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(195px,1fr));gap:1rem}.feature-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.3rem;transition:box-shadow .2s,transform .2s}.feature-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}.feature-icon{width:40px;height:40px;border-radius:10px;background:var(--primary-subtle);display:flex;align-items:center;justify-content:center;margin-bottom:.85rem}.feature-icon svg{width:20px;height:20px;color:var(--primary)}.feature-card h3{font-size:.9rem;font-weight:700;margin-bottom:.4rem;color:var(--text)}.feature-card p{font-size:.8rem;color:var(--text-muted);line-height:1.55}.faq{margin-top:2.5rem}.faq-title{font-size:1.15rem;font-weight:800;letter-spacing:-.03em;color:var(--text);margin-bottom:1rem}.faq-item{border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:.6rem;background:var(--surface);overflow:hidden}.faq-item summary{padding:1rem 1.1rem;font-size:.9rem;font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:1rem;color:var(--text);-webkit-user-select:none;user-select:none;transition:background .12s}.faq-item summary:hover{background:var(--bg)}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary:after{content:"+";font-size:1.25rem;font-weight:300;color:var(--text-muted);flex-shrink:0}.faq-item[open] summary{background:var(--bg)}.faq-item[open] summary:after{content:"−"}.faq-item p{padding:0 1.1rem 1rem;font-size:.85rem;color:var(--text-secondary);line-height:1.65}footer{background:var(--surface);border-top:1px solid var(--border);padding:1.75rem 2rem}.footer-inner{max-width:720px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1rem}.footer-brand{font-size:.85rem;font-weight:700;color:var(--text-secondary)}.footer-local{display:inline-flex;align-items:center;gap:6px;font-size:.8rem;color:var(--text-muted)}.footer-local svg{width:14px;height:14px;color:var(--success)}@media (max-width: 600px){.site-header{padding:0 1rem}.hero{padding:2.5rem 1rem}main{padding:0 1rem 3rem}.footer-inner{flex-direction:column;align-items:flex-start}.header-badge span{display:none}}