:root{--gradient-start:#667eea;--gradient-end:#764ba2;--gradient:linear-gradient(135deg, var(--gradient-start), var(--gradient-end));--surface:#fff;--surface-glass:#ffffffb8;--surface-hover:#ffffffeb;--surface-deep:#ffffff73;--bg:#eef2ff;--bg-page:#e8ecf7;--border:#fff9;--border-subtle:#667eea2e;--primary:#667eea;--primary-dark:#5a6fd6;--primary-hover:#5860d0;--primary-glow:#667eea59;--primary-light:#667eea1a;--text:#2d3561;--text-secondary:#5c618b;--text-light:#8890b5;--success:#10b981;--success-hover:#059669;--success-light:#10b9811f;--error:#f43f5e;--error-light:#f43f5e1a;--warning:#f59e0b;--radius-card:20px;--radius-btn:12px;--radius-chip:8px;--radius-pill:999px;--shadow-card:0 4px 24px #667eea1f, 0 1px 4px #0000000f;--shadow-hover:0 8px 32px #667eea38, 0 2px 8px #00000014;--shadow-btn:0 4px 14px #667eea66;--shadow-success:0 4px 14px #10b98166}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg-page);color:var(--text);-webkit-font-smoothing:antialiased;background-image:radial-gradient(at 20% 10%,#764ba221 0%,#0000 50%),radial-gradient(at 80% 90%,#667eea21 0%,#0000 50%);min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.6}#root{max-width:860px;margin:0 auto;padding:24px 16px 48px}.hero{background:var(--gradient);border-radius:var(--radius-card);margin-bottom:20px;padding:36px 32px 32px;position:relative;overflow:hidden;box-shadow:0 8px 32px #667eea47}.hero:before{content:"";pointer-events:none;background:radial-gradient(circle at 70%,#ffffff1f 0%,#0000 60%),radial-gradient(circle at 20% 80%,#ffffff14 0%,#0000 40%);position:absolute;inset:0}.hero-inner{z-index:1;position:relative}.hero-badge{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:#ffffffeb;letter-spacing:.06em;text-transform:uppercase;border-radius:var(--radius-pill);background:#fff3;border:1px solid #ffffff40;align-items:center;gap:6px;margin-bottom:12px;padding:4px 12px;font-size:12px;font-weight:600;display:inline-flex}.hero-title{color:#fff;letter-spacing:-.02em;margin-bottom:6px;font-size:clamp(22px,4vw,30px);font-weight:800;line-height:1.2}.hero-sub{color:#ffffffc7;font-size:14px;font-weight:400}.tab-card{background:var(--surface-glass);-webkit-backdrop-filter:blur(20px);border:1px solid var(--border);border-radius:var(--radius-card);box-shadow:var(--shadow-card);gap:4px;margin-bottom:20px;padding:6px;display:flex}.tab-btn{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:14px;flex:1;justify-content:center;align-items:center;gap:8px;padding:11px 16px;font-family:inherit;font-size:14px;font-weight:600;transition:all .25s cubic-bezier(.34,1.56,.64,1);display:flex}.tab-btn:hover:not(.tab-btn--active){color:var(--primary);background:#667eea12}.tab-btn--active{background:var(--surface);color:var(--primary);box-shadow:0 2px 10px #667eea2e,0 1px 3px #0000000f}.tab-btn svg{flex-shrink:0}.converter-card{background:var(--surface-glass);-webkit-backdrop-filter:blur(20px);border:1px solid var(--border);border-radius:var(--radius-card);box-shadow:var(--shadow-card);transition:box-shadow .3s;overflow:hidden}.dropzone{border:2px dashed var(--border-subtle);text-align:center;cursor:pointer;background:var(--surface);border-radius:16px;margin:20px;padding:48px 24px;transition:all .25s;position:relative}.dropzone:hover,.dropzone.dragover{border-color:var(--primary);background:var(--primary-light);transform:scale(1.01)}.dropzone.dragover{box-shadow:0 0 0 4px var(--primary-glow)}.dropzone-icon{background:var(--primary-light);width:64px;height:64px;color:var(--primary);border-radius:16px;justify-content:center;align-items:center;margin:0 auto 16px;transition:all .25s;display:flex}.dropzone:hover .dropzone-icon,.dropzone.dragover .dropzone-icon{background:var(--primary);color:#fff;transform:scale(1.08)translateY(-2px)}.dropzone-title{color:var(--text);margin-bottom:4px;font-size:15px;font-weight:600}.dropzone-hint{color:var(--text-light);font-size:12px}.dropzone-formats{flex-wrap:wrap;justify-content:center;gap:6px;margin-top:12px;display:flex}.format-chip{border-radius:var(--radius-pill);background:var(--primary-light);color:var(--primary-dark);letter-spacing:.02em;padding:3px 10px;font-size:11px;font-weight:600}.dropzone input[type=file]{display:none}.file-section{padding:0 20px 20px}.file-preview-card{background:var(--surface);border:1px solid var(--border-subtle);border-radius:16px;margin-bottom:16px;overflow:hidden;box-shadow:0 2px 8px #0000000a}.file-preview-media{object-fit:contain;background:#f5f5f5;width:100%;max-height:280px;display:block}.file-meta{align-items:center;gap:12px;padding:14px 16px;display:flex}.file-meta-icon{background:var(--primary-light);width:40px;height:40px;color:var(--primary);border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;display:flex}.file-meta-info{flex:1;min-width:0}.file-meta-name{color:var(--text);white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:600;overflow:hidden}.file-meta-detail{color:var(--text-light);gap:12px;margin-top:2px;font-size:12px;display:flex}.file-meta-change{color:var(--primary);align-items:center;gap:4px;margin-top:2px;font-size:11px;font-weight:600;display:flex}.settings-section{padding:0 20px}.settings-grid{grid-template-columns:1fr 1fr;gap:12px;margin-bottom:12px;display:grid}.setting-group{flex-direction:column;gap:6px;display:flex}.setting-label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.06em;font-size:12px;font-weight:600}.setting-select{border:1.5px solid var(--border-subtle);border-radius:var(--radius-btn);background:var(--surface);color:var(--text);cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%235c618b' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");background-position:right 12px center;background-repeat:no-repeat;padding:10px 36px 10px 14px;font-family:inherit;font-size:14px;font-weight:500;transition:border-color .2s,box-shadow .2s}.setting-select:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-glow);outline:none}.quality-row{background:var(--surface);border:1.5px solid var(--border-subtle);border-radius:var(--radius-btn);align-items:center;gap:10px;padding:10px 14px;transition:border-color .2s,box-shadow .2s;display:flex}.quality-row:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-glow)}.quality-row input[type=range]{-webkit-appearance:none;background:var(--border-subtle);border-radius:2px;outline:none;flex:1;height:4px}.quality-row input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;background:var(--primary);cursor:pointer;border-radius:50%;width:18px;height:18px;transition:transform .15s;box-shadow:0 1px 4px #667eea66}.quality-row input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.15)}.quality-value{min-width:36px;color:var(--primary);text-align:right;font-size:14px;font-weight:700}.action-bar{-webkit-backdrop-filter:blur(20px);border-top:1px solid var(--border);border-radius:0 0 var(--radius-card) var(--radius-card);background:#ffffffe0;flex-direction:column;gap:8px;margin:16px 0 0;padding:14px 20px;display:flex;position:sticky;bottom:0;left:0;right:0}.btn{border-radius:var(--radius-btn);cursor:pointer;letter-spacing:.01em;border:none;justify-content:center;align-items:center;gap:8px;padding:13px 24px;font-family:inherit;font-size:14px;font-weight:700;transition:all .22s cubic-bezier(.34,1.56,.64,1);display:inline-flex;position:relative;overflow:hidden}.btn:disabled{opacity:.45;cursor:not-allowed;box-shadow:none!important;transform:none!important}.btn-primary{background:var(--gradient);color:#fff;box-shadow:var(--shadow-btn)}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px #667eea80}.btn-primary:active:not(:disabled){transform:translateY(0)}.btn-success{background:var(--success);color:#fff;box-shadow:var(--shadow-success)}.btn-success:hover:not(:disabled){background:var(--success-hover);transform:translateY(-2px);box-shadow:0 6px 20px #10b98180}.btn-outline{color:var(--text-secondary);border:1.5px solid var(--border-subtle);background:0 0}.btn-outline:hover:not(:disabled){border-color:var(--primary);color:var(--primary);background:var(--primary-light);transform:translateY(-1px)}.btn-full{width:100%}.btn-spinner{border:2px solid #ffffff59;border-top-color:#fff;border-radius:50%;flex-shrink:0;width:16px;height:16px;animation:.7s linear infinite spin}.btn-spinner--dark{border-color:#667eea4d;border-top-color:var(--primary)}@keyframes spin{to{transform:rotate(360deg)}}.progress-wrap{background:var(--surface);border:1px solid var(--border-subtle);border-radius:14px;margin-bottom:12px;padding:16px}.progress-label{justify-content:space-between;align-items:center;margin-bottom:10px;display:flex}.progress-label-text{color:var(--text);align-items:center;gap:6px;font-size:13px;font-weight:600;display:flex}.progress-pct{color:var(--primary);font-size:13px;font-weight:700}.progress-track{background:var(--primary-light);border-radius:4px;height:8px;overflow:hidden}.progress-fill{background:var(--gradient);border-radius:4px;height:100%;transition:width .35s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden}.progress-fill:after{content:"";background:linear-gradient(90deg,#0000 0%,#fff6 50%,#0000 100%);animation:1.4s infinite shimmer;position:absolute;inset:0}@keyframes shimmer{0%{transform:translate(-100%)}to{transform:translate(200%)}}.success-banner{background:var(--success-light);color:var(--success);border:1px solid #10b98140;border-radius:12px;align-items:center;gap:10px;margin-bottom:12px;padding:12px 16px;font-size:13px;font-weight:500;display:flex}.error-card{background:var(--error-light);color:var(--error);border:1px solid #f43f5e33;border-radius:12px;align-items:flex-start;gap:10px;margin:0 20px 4px;padding:12px 14px;font-size:13px;font-weight:500;display:flex}.converted-section{padding:0 20px 8px}.converted-card{background:var(--success-light);border:1px solid #10b98133;border-radius:16px;overflow:hidden}.converted-header{color:var(--success);border-bottom:1px solid #10b98126;align-items:center;gap:8px;padding:12px 16px;font-size:13px;font-weight:700;display:flex}.converted-media{object-fit:contain;background:#f5f5f5;width:100%;max-height:260px;display:block}.helper-text{color:var(--text-light);align-items:center;gap:5px;font-size:12px;display:flex}.divider{background:var(--border-subtle);height:1px;margin:4px 20px}@media (width<=520px){#root{padding:12px 12px 40px}.hero{padding:24px 20px 20px}.settings-grid{grid-template-columns:1fr}.dropzone{padding:36px 16px}.action-bar{padding:12px 16px}.tab-btn{gap:6px;padding:9px 10px;font-size:13px}}