:root{--bg:#f8f9fb;--surface:#fff;--surface-hover:#f1f3f7;--border:#e2e6ed;--border-light:#eef1f6;--text:#1a1d23;--text-secondary:#6b7280;--text-muted:#9ca3af;--primary:#4f46e5;--primary-hover:#4338ca;--primary-light:#eef2ff;--success:#10b981;--success-light:#ecfdf5;--danger:#ef4444;--danger-light:#fef2f2;--warning:#f59e0b;--radius:12px;--radius-sm:8px;--shadow:0 1px 3px #0000000f, 0 1px 2px #0000000a;--shadow-lg:0 10px 25px #00000014;--transition:all .2s ease}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;line-height:1.6}.app{flex-direction:column;min-height:100vh;display:flex}.header{background:var(--surface);border-bottom:1px solid var(--border);z-index:100;box-shadow:var(--shadow);position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;max-width:1100px;height:64px;margin:0 auto;padding:0 24px;display:flex}.logo{align-items:center;gap:8px;display:flex}.logo-icon{font-size:28px}.logo h1{color:var(--primary);letter-spacing:-.5px;font-size:22px;font-weight:700}.tagline{color:var(--text-muted);border-left:1px solid var(--border);margin-left:4px;padding-left:8px;font-size:13px}.tool-nav{gap:4px;display:flex}.nav-btn{color:var(--text-secondary);border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition);background:0 0;border:none;align-items:center;gap:6px;padding:8px 16px;font-size:14px;font-weight:500;display:flex}.nav-btn:hover{background:var(--surface-hover);color:var(--text)}.nav-btn.active{background:var(--primary-light);color:var(--primary)}.nav-icon{font-size:16px}.hero{text-align:center;width:100%;max-width:1100px;margin:0 auto;padding:32px 24px 16px}.hero h2{margin-bottom:8px;font-size:24px;font-weight:700}.hero p{color:var(--text-secondary);font-size:15px}.main{flex:1;width:100%;max-width:1100px;margin:0 auto;padding:0 24px 40px}.settings-panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);flex-wrap:wrap;align-items:flex-end;gap:24px;margin-bottom:20px;padding:24px;display:flex}.setting-group{flex-direction:column;gap:6px;min-width:160px;display:flex}.setting-group label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;font-size:13px;font-weight:600}.setting-row{flex:1;align-items:flex-end;gap:8px;display:flex}.flex-1{flex:1}.link-btn{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);cursor:pointer;width:40px;height:40px;transition:var(--transition);justify-content:center;align-items:center;margin-bottom:1px;font-size:18px;display:flex}.link-btn.active{background:var(--primary-light);border-color:var(--primary)}.link-btn:hover{border-color:var(--primary)}.input,.select{border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);background:var(--surface);transition:var(--transition);outline:none;width:100%;padding:10px 14px;font-size:14px}.input:focus,.select:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}.input-hint{color:var(--text-muted);font-size:12px}.quality-slider{align-items:center;gap:12px;display:flex}.quality-slider input[type=range]{appearance:none;background:var(--border);border-radius:3px;outline:none;flex:1;height:6px}.quality-slider input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;background:var(--primary);cursor:pointer;border-radius:50%;width:20px;height:20px;box-shadow:0 2px 6px #4f46e54d}.quality-value{color:var(--primary);text-align:right;min-width:40px;font-size:16px;font-weight:700}.quality-hints{color:var(--text-muted);justify-content:space-between;font-size:11px;display:flex}.format-options{gap:8px;display:flex}.format-btn{border:2px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);cursor:pointer;transition:var(--transition);flex-direction:column;align-items:center;padding:12px 20px;display:flex}.format-btn:hover{border-color:var(--primary)}.format-btn.active{border-color:var(--primary);background:var(--primary-light)}.format-label{font-size:16px;font-weight:700}.format-ext{color:var(--text-muted);font-size:12px}.format-tips{border-top:1px solid var(--border-light);flex-wrap:wrap;gap:16px;width:100%;padding-top:12px;display:flex}.tip{color:var(--text-secondary);font-size:13px}.tip strong{color:var(--text)}.dropzone{border:2px dashed var(--border);border-radius:var(--radius);text-align:center;cursor:pointer;transition:var(--transition);background:var(--surface);box-shadow:var(--shadow);padding:48px 24px}.dropzone:hover{border-color:var(--primary);background:var(--primary-light)}.dropzone.dragging{border-color:var(--primary);background:var(--primary-light);transform:scale(1.01)}.dropzone-icon{margin-bottom:12px;font-size:48px;display:block}.dropzone-title{color:var(--text);margin-bottom:4px;font-size:16px;font-weight:600}.dropzone-hint{color:var(--text-muted);font-size:13px}.files-preview{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:20px;padding:16px 20px}.files-header{justify-content:space-between;align-items:center;margin-bottom:12px;font-weight:600;display:flex}.files-actions{gap:8px;display:flex}.files-list{flex-wrap:wrap;gap:6px;display:flex}.file-tag{background:var(--surface-hover);color:var(--text-secondary);border-radius:6px;padding:4px 10px;font-size:12px}.file-tag.more{background:var(--primary-light);color:var(--primary)}.btn{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);color:var(--text);cursor:pointer;transition:var(--transition);align-items:center;gap:6px;padding:8px 16px;font-size:14px;font-weight:500;display:inline-flex}.btn:hover{background:var(--surface-hover);border-color:#d1d5db}.btn-sm{padding:6px 12px;font-size:13px}.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}.btn-primary:hover{background:var(--primary-hover)}.btn-lg{border-radius:var(--radius);padding:12px 32px;font-size:16px;font-weight:600}.btn-danger{color:var(--danger)}.btn-danger:hover{background:var(--danger-light)}.btn:disabled{opacity:.5;cursor:not-allowed}.action-bar{text-align:center;margin:24px 0}.progress-section{text-align:center;padding:24px}.progress-bar{background:var(--border);border-radius:4px;max-width:400px;height:8px;margin-bottom:12px;margin-left:auto;margin-right:auto;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--primary), #818cf8);border-radius:4px;height:100%;transition:width .3s}.progress-text{color:var(--text-secondary);font-size:14px}.results-section{margin-top:24px}.results-header{flex-wrap:wrap;align-items:center;gap:16px;margin-bottom:16px;display:flex}.results-header h3{font-size:18px}.results-summary{color:var(--text-secondary);gap:12px;font-size:14px;display:flex}.total-ratio{color:var(--success);background:var(--success-light);border-radius:4px;padding:2px 8px;font-weight:700}.results-actions{gap:8px;margin-left:auto;display:flex}.results-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;display:grid}.result-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);transition:var(--transition);overflow:hidden}.result-card:hover{box-shadow:var(--shadow-lg)}.result-preview{background:var(--surface-hover);justify-content:center;align-items:center;height:140px;padding:8px;display:flex;overflow:hidden}.result-preview img{object-fit:contain;border-radius:4px;max-width:100%;max-height:100%}.result-info{padding:12px 16px}.result-name{white-space:nowrap;text-overflow:ellipsis;margin-bottom:6px;font-size:13px;font-weight:600;overflow:hidden}.result-stats{align-items:center;gap:6px;margin-bottom:4px;font-size:13px;display:flex}.result-size{color:var(--text-secondary)}.result-arrow{color:var(--text-muted)}.result-new-size{font-weight:600}.result-new-size.smaller{color:var(--success)}.result-new-size.bigger{color:var(--warning)}.result-ratio{border-radius:4px;padding:1px 6px;font-size:12px;font-weight:700}.result-ratio.good{color:var(--success);background:var(--success-light)}.result-ratio.bad{color:var(--warning);background:#fef3c7}.result-dimensions{color:var(--text-muted);font-size:12px}.download-btn{border:none;border-top:1px solid var(--border-light);background:var(--surface);width:100%;color:var(--primary);cursor:pointer;transition:var(--transition);padding:10px;font-size:14px;font-weight:600}.download-btn:hover{background:var(--primary-light)}.features{border-top:1px solid var(--border);grid-template-columns:repeat(4,1fr);gap:24px;max-width:1100px;margin:0 auto;padding:40px 24px;display:grid}.feature{text-align:center;padding:24px 16px}.feature-icon{margin-bottom:12px;font-size:36px;display:block}.feature h3{margin-bottom:6px;font-size:16px}.feature p{color:var(--text-secondary);font-size:13px;line-height:1.5}.footer{text-align:center;color:var(--text-muted);border-top:1px solid var(--border);padding:24px;font-size:13px}@media (width<=768px){.header-inner{flex-direction:column;gap:8px;height:auto;padding:12px 16px}.tool-nav{justify-content:center;width:100%}.hero{padding:20px 16px 12px}.hero h2{font-size:20px}.main{padding:0 16px 24px}.settings-panel{flex-direction:column;gap:16px;padding:16px}.setting-group{width:100%;min-width:auto}.setting-row{flex-direction:column}.link-btn{align-self:center}.format-options{flex-direction:column}.format-btn{flex-direction:row;gap:8px;padding:10px 16px}.features{grid-template-columns:repeat(2,1fr);gap:16px;padding:24px 16px}.results-header{flex-direction:column;align-items:flex-start}.results-actions{margin-left:0}.results-grid{grid-template-columns:1fr}}@media (width<=480px){.tagline{display:none}.nav-btn{padding:6px 10px;font-size:13px}.features{grid-template-columns:1fr}}