:root{--primary-color:#18a058;--primary-hover:#36ad6a;--bg-color:#f5f7fa;--card-bg:#fff;--text-color:#333639;--text-secondary:#8a8f99;--border-color:#e0e2e6;--shadow-sm:0 1px 3px #0000000f;--shadow-md:0 4px 12px #00000014;--radius:12px}*{box-sizing:border-box;margin:0;padding:0}html,body,#app{background:var(--bg-color);height:100%;color:var(--text-color);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Noto Sans SC,sans-serif}.page-container{max-width:1200px;margin:0 auto;padding:24px 16px}.card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow-sm);border:1px solid var(--border-color);padding:24px}.drop-zone{border:2px dashed var(--border-color);border-radius:var(--radius);text-align:center;cursor:pointer;background:#fafafa;padding:48px 24px;transition:all .3s}.drop-zone:hover,.drop-zone.drag-over{border-color:var(--primary-color);background:#f0faf3}.drop-zone.drag-over{transform:scale(1.01)}@keyframes progress-pulse{0%{opacity:1}50%{opacity:.7}to{opacity:1}}.converting{animation:1.5s ease-in-out infinite progress-pulse}.format-grid{grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:12px;display:grid}.format-item{background:var(--card-bg);border:1px solid var(--border-color);cursor:pointer;border-radius:8px;flex-direction:column;justify-content:center;align-items:center;padding:12px 8px;font-size:13px;transition:all .2s;display:flex}.format-item:hover{border-color:var(--primary-color);box-shadow:var(--shadow-sm);background:#f0faf3;transform:translateY(-2px)}.format-item.active{border-color:var(--primary-color);color:var(--primary-color);background:#f0faf3;font-weight:600}.format-item:focus-visible{outline:2px solid var(--primary-color);outline-offset:2px}.format-item .format-icon{margin-bottom:6px;font-size:28px}.hero{text-align:center;padding:24px 8px 8px}.hero h1{color:var(--text-primary,#333);margin:0 0 10px;font-size:26px}.hero-sub{color:#666;margin:0 0 14px;font-size:15px}.hero-tags{flex-wrap:wrap;justify-content:center;gap:10px;display:flex}.hero-tag{color:#18a058;background:#f0faf3;border:1px solid #b7e3c8;border-radius:999px;align-items:center;padding:4px 10px;font-size:13px;font-weight:500;display:inline-flex}.sample-row{border-top:1px dashed var(--border-color);flex-wrap:wrap;align-items:center;gap:10px;margin-top:12px;padding-top:12px;display:flex}.sample-label{color:#888;font-size:13px}.task-list{flex-direction:column;gap:12px;display:flex}.task-item{background:var(--card-bg);border:1px solid var(--border-color);border-radius:8px;align-items:center;gap:16px;padding:12px 16px;transition:all .2s;display:flex}.task-item:hover{box-shadow:var(--shadow-sm)}.empty-state{text-align:center;color:var(--text-secondary);flex-direction:column;justify-content:center;align-items:center;padding:60px 24px;display:flex}.empty-state .empty-icon{opacity:.4;margin-bottom:16px;font-size:64px}