*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root{--color-bg-start: #f0f4ff;--color-bg-end: #faf5ff;--color-surface: rgba(255, 255, 255, .72);--color-surface-solid: #ffffff;--color-border: #e8ecf4;--color-text: #1a1d2e;--color-text-secondary: #6b7294;--color-primary: #7c3aed;--color-primary-light: #a78bfa;--color-primary-hover: #6d28d9;--color-primary-gradient: linear-gradient(135deg, #7c3aed 0%, #3b82f6 100%);--color-error: #ef4444;--color-error-bg: #fef2f2;--color-success: #22c55e;--radius: 16px;--radius-sm: 10px;--radius-xs: 6px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);--shadow: 0 2px 8px rgba(0, 0, 0, .06), 0 1px 3px rgba(0, 0, 0, .04);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .08), 0 2px 8px rgba(0, 0, 0, .04);--shadow-xl: 0 20px 48px rgba(124, 58, 237, .12), 0 4px 16px rgba(0, 0, 0, .06);--transition: .2s cubic-bezier(.4, 0, .2, 1)}html{font-size:16px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans SC,PingFang SC,Microsoft YaHei,sans-serif;background:linear-gradient(160deg,var(--color-bg-start) 0%,var(--color-bg-end) 50%,#f0f9ff 100%);background-attachment:fixed;color:var(--color-text);min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased}#root{min-height:100vh;display:flex;flex-direction:column}@keyframes fadeInUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.app-container{display:flex;flex-direction:column;min-height:100vh;max-width:1000px;margin:0 auto;padding:0 24px;width:100%}.app-main{flex:1;display:flex;flex-direction:column;align-items:center;padding:32px 0 60px;animation:fadeInUp .5s ease both}.header{display:flex;align-items:center;justify-content:center;padding:18px 0;gap:12px;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);background:#ffffff7a;border-bottom:1px solid rgba(232,236,244,.6);position:sticky;top:0;z-index:10}.header-logo-svg{width:36px;height:36px;flex-shrink:0}.header-title{font-size:20px;font-weight:800;letter-spacing:-.4px;background:var(--color-primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.upload-zone{width:100%;max-width:600px;margin-top:48px;animation:fadeInUp .6s ease both}.upload-drop-area{position:relative;border:2px dashed var(--color-border);border-radius:var(--radius);padding:56px 32px 40px;text-align:center;cursor:pointer;transition:all var(--transition);background:var(--color-surface);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);box-shadow:var(--shadow)}.upload-drop-area:hover{border-color:var(--color-primary-light);box-shadow:var(--shadow-lg);transform:translateY(-2px)}.upload-drop-area.drag-over{border-color:var(--color-primary);background:#7c3aed0f;box-shadow:var(--shadow-xl);transform:scale(1.01)}.upload-drop-area.drag-over:before{content:"";position:absolute;top:-4px;right:-4px;bottom:-4px;left:-4px;border-radius:calc(var(--radius) + 4px);border:2px solid var(--color-primary);animation:pulseRing 1.2s ease-out infinite;pointer-events:none}@keyframes pulseRing{0%{opacity:.6;transform:scale(1)}to{opacity:0;transform:scale(1.04)}}.upload-icon-svg{display:block;margin:0 auto 20px;width:72px;height:72px}.upload-title{font-size:20px;font-weight:700;margin-bottom:8px;color:var(--color-text)}.upload-subtitle{color:var(--color-text-secondary);font-size:14px;margin-bottom:24px}.upload-btn{display:inline-flex;align-items:center;gap:8px;padding:12px 32px;background:var(--color-primary-gradient);color:#fff;border:none;border-radius:50px;font-size:15px;font-weight:600;cursor:pointer;transition:all var(--transition);box-shadow:0 4px 16px #7c3aed47}.upload-btn:hover{transform:translateY(-1px);box-shadow:0 6px 24px #7c3aed5c}.upload-btn:active{transform:translateY(0)}.upload-hint{margin-top:20px;font-size:13px;color:var(--color-text-secondary)}.upload-hint kbd{display:inline-block;padding:3px 8px;font-size:12px;font-family:inherit;background:#f1f5f9;border-radius:4px;border:1px solid #e2e8f0;font-weight:500}.notes-card{width:100%;max-width:600px;margin-top:20px;display:grid;grid-template-columns:1fr 1fr;gap:12px;animation:fadeInUp .7s ease both}.notes-item{display:flex;align-items:flex-start;gap:10px;padding:14px 16px;background:var(--color-surface);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--color-border);border-radius:var(--radius-sm);font-size:13px;color:var(--color-text-secondary);line-height:1.5}.notes-item-icon{font-size:18px;flex-shrink:0;margin-top:1px}.notes-item strong{display:block;color:var(--color-text);font-size:13px;margin-bottom:2px}.editor{width:100%;display:flex;flex-direction:column;gap:24px;margin-top:32px;animation:fadeIn .35s ease both}.preview-container{display:flex;gap:20px;justify-content:center;flex-wrap:wrap}.preview-pane{flex:1;min-width:280px;max-width:460px;background:var(--color-surface-solid);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;border:1px solid var(--color-border)}.preview-label{font-size:12px;font-weight:700;color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:.6px;padding:14px 18px 0}.preview-image-wrap{padding:18px;display:flex;align-items:center;justify-content:center;min-height:280px;background-image:linear-gradient(45deg,#e8ecf4 25%,transparent 25%),linear-gradient(-45deg,#e8ecf4 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#e8ecf4 75%),linear-gradient(-45deg,transparent 75%,#e8ecf4 75%);background-size:16px 16px;background-position:0 0,0 8px,8px -8px,-8px 0}.preview-image-wrap.with-bg{background-image:none}.preview-image{max-width:100%;max-height:420px;object-fit:contain;border-radius:var(--radius-xs)}.preview-placeholder{color:var(--color-text-secondary);font-size:14px}.toolbar{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap}.toolbar-btn{display:inline-flex;align-items:center;gap:8px;padding:11px 26px;border:none;border-radius:50px;font-size:14px;font-weight:600;cursor:pointer;transition:all var(--transition)}.toolbar-btn:disabled{opacity:.55;cursor:not-allowed}.toolbar-btn.primary{background:var(--color-primary-gradient);color:#fff;box-shadow:0 4px 16px #7c3aed3d}.toolbar-btn.primary:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 6px 24px #7c3aed57}.toolbar-btn.secondary{background:var(--color-surface-solid);color:var(--color-text);border:1px solid var(--color-border)}.toolbar-btn.secondary:hover:not(:disabled){background:#f8fafc;border-color:#cbd5e1}.spinner{display:inline-block;width:18px;height:18px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite}.spinner.dark{border-color:#0000001f;border-top-color:var(--color-primary)}@keyframes spin{to{transform:rotate(360deg)}}.bg-picker{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;padding:16px 20px;background:var(--color-surface);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--color-border);border-radius:50px}.bg-picker-label{font-size:13px;font-weight:700;color:var(--color-text-secondary);margin-right:4px}.bg-swatch{width:30px;height:30px;border-radius:50%;border:2px solid transparent;cursor:pointer;transition:all var(--transition);position:relative}.bg-swatch:hover{transform:scale(1.15)}.bg-swatch.active{border-color:var(--color-primary);box-shadow:0 0 0 3px #7c3aed3d}.bg-swatch.transparent{background-image:linear-gradient(45deg,#d4d9e0 25%,transparent 25%),linear-gradient(-45deg,#d4d9e0 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#d4d9e0 75%),linear-gradient(-45deg,transparent 75%,#d4d9e0 75%);background-size:8px 8px;background-position:0 0,0 4px,4px -4px,-4px 0}.bg-color-input{width:30px;height:30px;border:none;border-radius:50%;cursor:pointer;padding:0}.bg-color-input::-webkit-color-swatch-wrapper{padding:0}.bg-color-input::-webkit-color-swatch{border-radius:50%;border:2px solid var(--color-border)}.bg-image-btn{font-size:13px;padding:7px 16px;background:var(--color-surface-solid);border:1px solid var(--color-border);border-radius:50px;cursor:pointer;transition:all var(--transition);color:var(--color-text);font-weight:500}.bg-image-btn:hover{background:#f8fafc;border-color:#cbd5e1}.error-banner{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;max-width:600px;padding:14px 18px;background:var(--color-error-bg);border:1px solid #fecaca;border-radius:var(--radius-sm);color:var(--color-error);font-size:14px}.error-banner-dismiss{background:none;border:none;color:var(--color-error);font-size:20px;cursor:pointer;line-height:1;padding:0 4px;opacity:.6}.error-banner-dismiss:hover{opacity:1}.error-banner-retry{background:var(--color-error);color:#fff;border:none;padding:7px 16px;border-radius:50px;font-size:13px;cursor:pointer;font-weight:600;white-space:nowrap}.preview-image-wrap.processing{position:relative}.preview-image-wrap.processing:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:#ffffff8c;border-radius:var(--radius)}.preview-image-wrap.processing .spinner.dark{position:absolute;z-index:1;top:50%;left:50%;transform:translate(-50%,-50%);width:36px;height:36px;border-width:3px}.app-footer{text-align:center;padding:24px 0;font-size:12px;color:var(--color-text-secondary);border-top:1px solid rgba(232,236,244,.4)}.app-footer-divider{display:block;width:40px;height:3px;background:var(--color-primary-gradient);border-radius:2px;margin:0 auto 16px;opacity:.5}@media(max-width:640px){.preview-container{flex-direction:column;align-items:center}.preview-pane{max-width:100%}.notes-card{grid-template-columns:1fr}.upload-drop-area{padding:40px 20px 32px}.bg-picker{border-radius:var(--radius);gap:8px}}