:root{--primary: #4A90D9;--primary-hover: #357ABD;--bg: #f5f5f7;--card-bg: #ffffff;--text: #1d1d1f;--text-secondary: #6e6e73;--border: #d2d2d7;--radius: 12px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100dvh;-webkit-tap-highlight-color:transparent}#root{min-height:100dvh;display:flex;flex-direction:column}.app{display:flex;flex-direction:column;min-height:100dvh}.header{background:var(--card-bg);border-bottom:1px solid var(--border);padding:12px 16px;text-align:center}.header h1{font-size:18px;font-weight:600}.steps{display:flex;justify-content:center;gap:8px;padding:12px 16px;background:var(--card-bg);border-bottom:1px solid var(--border)}.step{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--text-secondary)}.step.active{color:var(--primary);font-weight:600}.step.done{color:var(--primary)}.step-number{width:22px;height:22px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:600;background:var(--border);color:var(--text-secondary)}.step.active .step-number,.step.done .step-number{background:var(--primary);color:#fff}.step-arrow{color:var(--border);font-size:12px}.content{flex:1;display:flex;flex-direction:column;align-items:center;padding:16px;overflow-y:auto}.select-section{width:100%;max-width:480px;display:flex;flex-direction:column;gap:20px}.upload-area{border:2px dashed var(--border);border-radius:var(--radius);padding:40px 20px;text-align:center;cursor:pointer;background:var(--card-bg);transition:border-color .2s}.upload-area:active{border-color:var(--primary)}.upload-area.has-image{padding:12px;border-style:solid}.upload-area p{color:var(--text-secondary);font-size:14px;margin-top:8px}.upload-icon{font-size:40px;color:var(--text-secondary)}.upload-preview{max-width:100%;max-height:200px;border-radius:8px;object-fit:contain}.frame-select-label{font-size:15px;font-weight:600;margin-bottom:4px}.frame-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.frame-option{aspect-ratio:1;border:2px solid var(--border);border-radius:var(--radius);overflow:hidden;cursor:pointer;background:var(--card-bg);padding:8px;transition:border-color .2s,box-shadow .2s;display:flex;align-items:center;justify-content:center}.frame-option:active,.frame-option.selected{border-color:var(--primary);box-shadow:0 0 0 2px #4a90d94d}.frame-option img{width:100%;height:100%;object-fit:contain}.editor-section{width:100%;max-width:480px;display:flex;flex-direction:column;gap:16px;align-items:center}.canvas-wrapper{position:relative;background:repeating-conic-gradient(#e0e0e0 0% 25%,#fff 0% 50%) 50% / 20px 20px;border-radius:var(--radius);overflow:hidden;touch-action:none;border:1px solid var(--border);max-width:100%}.canvas-wrapper canvas{display:block;max-width:100%;height:auto}.zoom-controls{display:flex;align-items:center;gap:12px;width:100%;background:var(--card-bg);padding:12px 16px;border-radius:var(--radius);border:1px solid var(--border)}.zoom-controls label{font-size:13px;font-weight:500;white-space:nowrap}.zoom-controls input[type=range]{flex:1;accent-color:var(--primary)}.zoom-value{font-size:13px;color:var(--text-secondary);min-width:40px;text-align:right}.editor-hint{font-size:13px;color:var(--text-secondary);text-align:center}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 28px;border:none;border-radius:var(--radius);font-size:16px;font-weight:600;cursor:pointer;transition:background-color .2s,opacity .2s;width:100%;max-width:480px}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff}.btn-primary:active:not(:disabled){background:var(--primary-hover)}.btn-secondary{background:var(--card-bg);color:var(--text);border:1px solid var(--border)}.btn-secondary:active{background:#eee}.bottom-bar{padding:12px 16px;background:var(--card-bg);border-top:1px solid var(--border);display:flex;gap:8px;justify-content:center}.bottom-bar .btn{max-width:240px}.download-section{width:100%;max-width:480px;display:flex;flex-direction:column;align-items:center;gap:20px}.result-preview{max-width:100%;border-radius:var(--radius);border:1px solid var(--border)}.success-message{text-align:center}.success-message h2{font-size:20px;margin-bottom:4px}.success-message p{color:var(--text-secondary);font-size:14px}@media(min-width:768px){.header h1{font-size:22px}.content{padding:24px}.frame-grid{grid-template-columns:repeat(2,140px)}.canvas-wrapper{max-width:480px}.btn{max-width:320px}}