:root{--primary: #1677ff;--primary-hover: #4096ff;--primary-bg: #e8f3ff;--success: #00b42a;--success-bg: #e8ffea;--danger: #f53f3f;--text: #1f2329;--text-secondary: #646a73;--text-tertiary: #86909c;--border: #e5e6eb;--bg: #f5f6f8;--card: #ffffff;--radius-lg: 12px;--radius-md: 8px;--shadow-sm: 0 1px 2px rgba(31, 35, 41, .06);--shadow-md: 0 4px 16px rgba(31, 35, 41, .1);--shadow-lift: 0 8px 24px rgba(22, 119, 255, .12)}.page{min-height:100%;display:flex;flex-direction:column}.site-header{background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}.site-header-inner{max-width:920px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between}.site-nav{display:flex;gap:26px}.site-nav a{font-size:14px;color:var(--text-secondary);text-decoration:none;transition:color .2s}.site-nav a:hover{color:var(--primary)}.logo{display:flex;align-items:center;gap:10px}.logo-mark{width:32px;height:32px;border-radius:8px;background:linear-gradient(135deg,var(--primary),#4e9bff);color:#fff;font-size:16px;font-weight:600;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 6px #1677ff59}.logo-name{font-size:16px;font-weight:600;letter-spacing:.5px}.site-main{flex:1;width:100%;max-width:920px;margin:0 auto;padding:32px 20px 48px}.hero{text-align:center;padding-top:20px}.notice{background:#fffbe6;border:1px solid #ffe58f;color:#ad6800;border-radius:var(--radius-md);padding:10px 14px;font-size:13px;margin-top:16px;animation:fadeIn .25s ease}.dropzone{border:2px dashed var(--border);border-radius:var(--radius-lg);background:var(--card);padding:52px 24px 44px;text-align:center;cursor:pointer;transition:border-color .2s,background-color .2s,box-shadow .2s,transform .2s}.dropzone:hover{border-color:var(--primary);background:#fbfdff}.dropzone-dragging{border-color:var(--primary);background:var(--primary-bg);box-shadow:var(--shadow-lift);transform:scale(1.005)}.dropzone-icon{width:64px;height:64px;margin:0 auto 18px;border-radius:50%;background:var(--primary-bg);color:var(--primary);display:flex;align-items:center;justify-content:center;transition:transform .2s}.dropzone:hover .dropzone-icon,.dropzone-dragging .dropzone-icon{transform:translateY(-3px)}.dropzone-title{font-size:17px;font-weight:600}.dropzone-sub{margin-top:6px;font-size:13px;color:var(--text-secondary)}.format-selector{display:inline-flex;background:#f2f3f5;border-radius:8px;padding:3px;margin-top:20px;gap:2px}.format-btn{font-size:13px;color:var(--text-secondary);padding:6px 16px;border-radius:6px;transition:all .2s;white-space:nowrap}.format-btn:hover{color:var(--text)}.format-btn-active{background:var(--card);color:var(--primary);font-weight:600;box-shadow:var(--shadow-sm)}.dropzone-formats{display:flex;justify-content:center;gap:10px;margin-top:22px;flex-wrap:wrap}.format-badge{font-size:12px;color:var(--text-secondary);background:#f2f3f5;border:1px solid var(--border);border-radius:6px;padding:3px 10px;letter-spacing:.5px;transition:all .2s}.dropzone:hover .format-badge,.dropzone-dragging .format-badge{color:var(--primary);border-color:#1677ff66;background:#fff}.features{margin:44px 0 8px}.features h2,.guide h2{font-size:22px;font-weight:700;text-align:center;margin-bottom:24px}.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.feature-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px 18px;text-align:center;box-shadow:var(--shadow-sm);transition:box-shadow .2s,transform .2s}.feature-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.feature-icon{width:48px;height:48px;margin:0 auto 14px;border-radius:12px;background:var(--primary-bg);color:var(--primary);display:flex;align-items:center;justify-content:center}.feature-card h3{font-size:15px;font-weight:600;margin-bottom:6px}.feature-card p{font-size:13px;color:var(--text-secondary);line-height:1.6}.guide{margin:44px 0 8px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px 32px;box-shadow:var(--shadow-sm)}.guide h2{text-align:left;margin-bottom:14px}.guide p{font-size:14px;color:var(--text-secondary);line-height:1.8;margin-bottom:10px}.guide p:last-child{margin-bottom:0}.files-section{margin-top:16px}.list-head{display:flex;align-items:center;justify-content:space-between;margin:32px 0 14px}.list-title{font-size:16px;font-weight:600}.list-actions{display:flex;gap:10px}.file-list{display:flex;flex-direction:column;gap:12px}.file-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:14px 16px;display:flex;align-items:center;gap:16px;position:relative;box-shadow:var(--shadow-sm);transition:box-shadow .2s,transform .2s,border-color .2s;animation:fadeIn .25s ease}.file-card:hover{box-shadow:var(--shadow-md);transform:translateY(-1px)}.file-thumb{width:72px;height:72px;flex-shrink:0;border-radius:var(--radius-md);overflow:hidden;background:#f2f3f5;border:1px solid var(--border);display:flex;align-items:center;justify-content:center}.file-thumb img{max-width:100%;max-height:100%;object-fit:contain}.file-info{flex:1;min-width:0}.file-name-row{display:flex;align-items:center;gap:8px}.file-name{font-size:14px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-type{font-size:11px;color:var(--text-secondary);background:#f2f3f5;border-radius:4px;padding:1px 6px;flex-shrink:0;letter-spacing:.5px}.file-size-row{display:flex;align-items:center;gap:8px;margin-top:6px;font-size:13px}.file-size-original{color:var(--text-secondary)}.file-arrow{color:var(--text-tertiary)}.file-size-compressed{color:var(--success);font-weight:600}.file-size-fallback{color:var(--text-secondary)}.file-saving{background:var(--success-bg);color:var(--success);font-size:12px;font-weight:600;border-radius:4px;padding:1px 8px}.file-fallback-tip{font-size:12px;color:var(--text-tertiary)}.file-error-text{font-size:13px;color:var(--danger)}.file-time{margin-top:2px;font-size:12px;color:var(--text-tertiary)}.file-compressing{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--primary)}.file-actions{display:flex;gap:8px;flex-shrink:0}.btn{border-radius:var(--radius-md);font-size:13px;font-weight:500;padding:7px 14px;transition:background-color .2s,color .2s,box-shadow .2s}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 2px 6px #1677ff4d}.btn-primary:hover:not(:disabled){background:var(--primary-hover);box-shadow:0 4px 10px #1677ff59}.btn-text{color:var(--text-secondary);background:#f2f3f5}.btn-text:hover:not(:disabled){color:var(--text);background:#e8eaed}.btn-danger{color:var(--danger);background:#ffece8}.btn-danger:hover:not(:disabled){background:#ffdcd5}.compare-panel{position:fixed;inset:0;background:#16233399;backdrop-filter:blur(4px);display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:100;padding:24px;animation:fadeIn .2s ease}.compare-head{background:var(--card);width:100%;max-width:860px;border-radius:var(--radius-lg) var(--radius-lg) 0 0;padding:12px 16px;display:flex;align-items:center;justify-content:space-between;box-shadow:var(--shadow-sm)}.compare-body{position:relative;width:100%;max-width:860px;background:#111827;overflow:hidden;user-select:none}.compare-img{width:100%;max-height:70vh;object-fit:contain}.compare-img-front{position:absolute;inset:0}.compare-divider{position:absolute;top:0;bottom:0;width:2px;background:#fff;box-shadow:0 0 6px #00000080;pointer-events:none}.compare-handle{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:32px;height:32px;border-radius:50%;background:#fff;color:#333;font-size:14px;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 8px #00000059}.compare-label{position:absolute;top:12px;color:#fff;font-size:12px;background:#0000008c;border-radius:4px;padding:2px 10px;pointer-events:none;backdrop-filter:blur(2px)}.compare-label-left{left:12px}.compare-label-right{right:12px}.compare-range{width:100%;max-width:860px;background:var(--card);border-radius:0 0 var(--radius-lg) var(--radius-lg);padding:12px 16px;accent-color:var(--primary)}.stats-bar{border-top:1px solid var(--border);background:var(--card);position:sticky;bottom:0;z-index:40;box-shadow:0 -2px 8px #1f23290a;animation:fadeIn .25s ease}.stats-bar-inner{max-width:920px;margin:0 auto;padding:12px 20px;display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--text-secondary)}.stats-saving{color:var(--success);font-weight:600}.site-footer{border-top:1px solid var(--border);background:var(--card);margin-top:24px}.site-footer-inner{max-width:920px;margin:0 auto;padding:20px;display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--text-tertiary)}.spinner{display:inline-block;width:14px;height:14px;border:2px solid var(--primary-bg);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite;vertical-align:-2px}@keyframes spin{to{transform:rotate(360deg)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}@media(max-width:768px){.site-nav{display:none}.feature-grid{grid-template-columns:repeat(2,1fr)}.stats-bar-inner{flex-direction:column;gap:4px;align-items:flex-start}}*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #1677ff;--primary-hover: #4096ff;--primary-bg: #e6f4ff;--success: #16a34a;--danger: #dc2626;--text: #1f2329;--text-secondary: #646a73;--border: #e5e6eb;--bg: #f5f6f7;--card: #ffffff;--radius: 8px}html,body,#root{height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);font-size:14px;line-height:1.5;-webkit-font-smoothing:antialiased}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}img{display:block}