:root{--bg-primary:#fff;--bg-secondary:#f8fafc;--bg-tertiary:#f1f5f9;--text-primary:#1e293b;--text-secondary:#475569;--text-tertiary:#64748b;--border-color:#e2e8f0;--accent-color:#3b82f6;--accent-hover:#2563eb;--success-color:#22c55e;--error-color:#ef4444;--warning-color:#f59e0b}[data-theme=dark]{--bg-primary:#0f172a;--bg-secondary:#1e293b;--bg-tertiary:#334155;--text-primary:#f8fafc;--text-secondary:#cbd5e1;--text-tertiary:#94a3b8;--border-color:#334155;--accent-color:#3b82f6;--accent-hover:#60a5fa;--success-color:#22c55e;--error-color:#ef4444;--warning-color:#f59e0b}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh;transition:background-color .3s ease,color .3s ease}a{color:var(--accent-color);text-decoration:none;transition:color .2s ease}a:hover{color:var(--accent-hover)}button{cursor:pointer}button,input,select,textarea{font-family:inherit}.tool-container{max-width:1200px;margin:0 auto;padding:2rem 1rem}.card{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:12px;padding:1.5rem;margin-bottom:1.5rem;transition:all .3s ease}.card:hover{box-shadow:0 4px 12px rgba(0,0,0,.1)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;border:none;border-radius:8px;font-size:.95rem;font-weight:500;transition:all .2s ease}.btn-primary{background-color:var(--accent-color);color:#fff}.btn-primary:hover{background-color:var(--accent-hover);color:#fff;transform:translateY(-1px)}.btn-primary:active,.btn-primary:focus{color:#fff}.btn-secondary{background-color:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover{background-color:var(--border-color)}.input-wrapper{display:flex;flex-direction:column;gap:.5rem}.input-label{font-weight:500;color:var(--text-secondary);font-size:.9rem}.input-field{width:100%;padding:.75rem 1rem;border:1px solid var(--border-color);border-radius:8px;background-color:var(--bg-primary);color:var(--text-primary);font-size:.95rem;resize:vertical;transition:border-color .2s ease,box-shadow .2s ease}.input-field:focus{outline:none;border-color:var(--accent-color);box-shadow:0 0 0 3px rgba(59,130,246,.1)}.input-field::placeholder{color:var(--text-tertiary)}.grid{display:grid;grid-gap:1rem;gap:1rem}.grid-2{grid-template-columns:repeat(1,1fr)}@media (min-width:768px){.grid-2{grid-template-columns:repeat(2,1fr)}}.toolbar{display:flex;flex-wrap:wrap;gap:.75rem;margin-bottom:1rem}.result-area,.toolbar{padding:1rem;background-color:var(--bg-tertiary);border-radius:8px}.result-area{min-height:150px;max-height:400px;overflow-y:auto;font-family:Monaco,Menlo,Ubuntu Mono,monospace;font-size:.9rem;word-break:break-all}.copy-btn{padding:.5rem 1rem;font-size:.85rem}.drop-zone{border:2px dashed var(--border-color);border-radius:12px;padding:3rem 2rem;text-align:center;transition:all .3s ease;cursor:pointer}.drop-zone.active,.drop-zone:hover{border-color:var(--accent-color);background-color:rgba(59,130,246,.05)}.drop-zone-icon{font-size:3rem;margin-bottom:1rem}.drop-zone-text{color:var(--text-secondary);font-size:1rem}.drop-zone-hint{color:var(--text-tertiary);font-size:.85rem;margin-top:.5rem}.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));grid-gap:1.5rem;gap:1.5rem}.feature-card{display:flex;flex-direction:column;padding:1.5rem;background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:12px;transition:all .3s ease}.feature-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.12);border-color:var(--accent-color)}.feature-card-icon{font-size:2rem;margin-bottom:1rem}.feature-card-title{font-size:1.1rem;font-weight:600;margin-bottom:.5rem;color:var(--text-primary)}.feature-card-desc{font-size:.9rem;color:var(--text-secondary);line-height:1.5}.image-preview{max-width:100%;max-height:300px;border-radius:8px;object-fit:contain}.loading-spinner{width:40px;height:40px;border:3px solid var(--border-color);border-top-color:var(--accent-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.toast{position:fixed;bottom:2rem;left:50%;transform:translateX(-50%);padding:.75rem 1.5rem;background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:8px;box-shadow:0 4px 12px rgba(0,0,0,.15);z-index:1000;animation:slideUp .3s ease}.toast-success{border-left:4px solid var(--success-color)}.toast-error{border-left:4px solid var(--error-color)}@keyframes slideUp{0%{opacity:0;transform:translateX(-50%) translateY(1rem)}to{opacity:1;transform:translateX(-50%) translateY(0)}}@media (max-width:640px){.card,.tool-container{padding:1rem}.btn{width:100%}.toolbar{flex-direction:column}}.tabs{display:flex;border-bottom:2px solid var(--border-color);margin-bottom:1.5rem;overflow-x:auto}.tab{padding:.75rem 1.5rem;background:none;border:none;border-bottom:2px solid transparent;color:var(--text-secondary);font-weight:500;white-space:nowrap;transition:all .2s ease}.tab.active,.tab:hover{color:var(--accent-color)}.tab.active{border-bottom-color:var(--accent-color)}.shortcut-hint{display:inline-flex;align-items:center;gap:.25rem;padding:.25rem .5rem;background-color:var(--bg-tertiary);border-radius:4px;font-size:.75rem;color:var(--text-tertiary)}.history-list{display:flex;flex-direction:column;gap:.5rem}.history-item{display:flex;justify-content:space-between;align-items:center;padding:.75rem;background-color:var(--bg-tertiary);border-radius:8px;font-size:.9rem}.history-item-content{flex:1 1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.history-item-time{color:var(--text-tertiary);font-size:.8rem;margin-left:1rem}