:root{--bg-primary:#ffffff;--bg-secondary:#f5f7fa;--text-primary:#333333;--text-secondary:#666666;--border-color:#d1d5db;--accent-color:#4f46e5;--accent-hover:#4338ca;--error-color:#ef4444;--success-color:#10b981;--card-shadow:0 4px 6px rgba(0,0,0,0.07);--header-shadow:0 2px 10px rgba(0,0,0,0.05)}.dark-mode{--bg-primary:#121826;--bg-secondary:#1a202c;--text-primary:#f0f4f8;--text-secondary:#a0aec0;--border-color:#2d3748;--accent-color:#818cf8;--accent-hover:#6366f1;--error-color:#f87171;--success-color:#34d399;--card-shadow:0 4px 6px rgba(0,0,0,0.2);--header-shadow:0 2px 10px rgba(0,0,0,0.3)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,'Open Sans','Helvetica Neue',sans-serif;background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;transition:background-color 0.3s ease,color 0.3s ease}.container{max-width:1200px;margin:0 auto;padding:20px}header{display:flex;justify-content:space-between;align-items:center;padding:15px 20px;background-color:var(--bg-secondary);border-radius:8px;box-shadow:var(--header-shadow);margin-bottom:30px}h1{font-size:1.8rem;font-weight:600;color:var(--text-primary)}.theme-toggle{background:none;border:none;cursor:pointer;font-size:1.5rem;color:var(--text-primary);padding:8px;border-radius:50%;transition:background-color 0.3s}.theme-toggle:hover{background-color:var(--bg-primary)}.main-content{display:grid;grid-template-columns:1fr;gap:25px}@media (min-width:768px){.main-content{grid-template-columns:1fr 1fr}}.card{background-color:var(--bg-secondary);border-radius:12px;padding:25px;box-shadow:var(--card-shadow);transition:transform 0.3s ease}@media (min-width:769px){.card:hover{transform:translateY(-5px)}}@media (max-width:768px){.card:active{transform:scale(0.99);transition:transform 0.05s}}.card-title{font-size:1.4rem;margin-bottom:20px;color:var(--text-primary);display:flex;align-items:center;gap:10px}.card-title i{color:var(--accent-color)}.input-group,.output-group{margin-bottom:15px}.input-group label,.output-group label{display:block;margin-bottom:8px;font-weight:500;color:var(--text-primary)}textarea,input[type="text"]{width:100%;min-height:150px;padding:15px;border:1px solid var(--border-color);border-radius:8px;background-color:var(--bg-primary);color:var(--text-primary);font-family:monospace;resize:vertical;transition:border-color 0.3s;font-size:14px}textarea:focus,input[type="text"]:focus{outline:none;border-color:var(--accent-color);box-shadow:0 0 0 3px rgba(79,70,229,0.2)}.controls{display:flex;flex-wrap:wrap;gap:12px;margin-top:15px}button{padding:12px 20px;border:none;border-radius:8px;background-color:var(--accent-color);color:white;cursor:pointer;font-weight:500;transition:all 0.3s ease;display:flex;align-items:center;gap:8px}@media (min-width:769px){button:hover{background-color:var(--accent-hover);transform:translateY(-2px)}}@media (max-width:768px){button:active{transform:scale(0.97);transition:transform 0.05s}}button.secondary{background-color:var(--bg-primary);color:var(--text-primary);border:1px solid var(--border-color)}@media (min-width:769px){button.secondary:hover{background-color:var(--bg-secondary)}}.image-preview{width:100%;height:200px;border:2px dashed var(--border-color);border-radius:8px;display:flex;flex-direction:column;justify-content:center;align-items:center;margin-top:15px;overflow:hidden;position:relative}.image-preview img{max-width:100%;max-height:100%;object-fit:contain}.image-preview p{color:var(--text-secondary);text-align:center;padding:0 10px;word-break:break-word}.drop-area{width:100%;height:150px;border:2px dashed var(--border-color);border-radius:8px;display:flex;flex-direction:column;justify-content:center;align-items:center;cursor:pointer;transition:all 0.3s;text-align:center;padding:15px}.drop-area p{word-break:break-word;font-size:0.9rem}.drop-area.drag-over{border-color:var(--accent-color);background-color:rgba(79,70,229,0.05)}.length-indicator{margin-top:15px;padding:10px;background-color:var(--bg-primary);border-radius:8px;color:var(--text-secondary);font-size:0.9rem;word-break:break-word}footer{margin-top:40px;text-align:center;padding:20px;color:var(--text-secondary);font-size:0.9rem}footer a{color:var(--accent-color);text-decoration:none}footer a:hover{text-decoration:underline}.notification{position:fixed;top:20px;right:20px;padding:15px 25px;border-radius:8px;background-color:var(--success-color);color:white;box-shadow:0 4px 12px rgba(0,0,0,0.15);transform:translateX(200%);transition:transform 0.3s ease;z-index:1000}.notification.show{transform:translateX(0)}.hidden{display:none}.file-input{display:none}.action-buttons{display:flex;flex-wrap:wrap;gap:10px;margin-top:15px}.action-buttons button{flex:1;min-width:100px}@media (max-width:768px){.container{padding:12px}header{flex-direction:column;gap:12px;text-align:center;padding:15px;margin-bottom:20px}h1{font-size:1.4rem}.theme-toggle{padding:8px 16px;border-radius:30px;background-color:var(--bg-primary)}.main-content{gap:16px}.card{padding:18px}.card-title{font-size:1.2rem;margin-bottom:15px}textarea,input[type="text"]{min-height:120px;padding:12px;font-size:16px}.controls{gap:10px}button{padding:10px 16px;font-size:0.9rem}.image-preview{height:180px}.drop-area{height:130px}.drop-area p{font-size:0.8rem}.length-indicator{font-size:0.8rem}footer{margin-top:30px;padding:15px;font-size:0.8rem}.notification{top:10px;right:10px;left:10px;text-align:center;padding:12px 20px;font-size:0.9rem}}@media (max-width:600px){.container{padding:8px}header{padding:12px;margin-bottom:15px}h1{font-size:1.2rem}.theme-toggle{font-size:1.2rem}.card{padding:14px;border-radius:10px}.card-title{font-size:1.1rem;margin-bottom:12px}.input-group label,.output-group label{font-size:0.9rem;margin-bottom:6px}textarea,input[type="text"]{min-height:100px;padding:10px;font-size:16px}.controls{gap:8px}button{padding:8px 14px;font-size:0.85rem}.action-buttons{gap:8px}.action-buttons button{min-width:auto;padding:8px 10px;font-size:0.8rem}.image-preview{height:150px}.drop-area{height:110px}.drop-area p{font-size:0.75rem}.length-indicator{padding:8px;font-size:0.75rem}}@media (max-width:400px){.controls{flex-direction:column}.controls button{width:100%;justify-content:center}.action-buttons{flex-direction:column}.action-buttons button{width:100%}.card-title{font-size:1rem}.card-title i{font-size:1rem}}@media (max-width:768px) and (orientation:landscape){.main-content{gap:12px}.card{padding:12px}textarea{min-height:80px}.image-preview{height:120px}.drop-area{height:90px}}@media (hover:none) and (pointer:coarse){button,.theme-toggle,.drop-area{cursor:pointer;-webkit-tap-highlight-color:transparent}button:active{transform:scale(0.97)}.drop-area:active{background-color:rgba(79,70,229,0.1)}}