:root {
    --primary-blue: #0066d4;
    --accent-blue: #00aaff;
    --bg-dark: #0a0a0a;
    --card-bg: rgba(20, 20, 20, 0.8);
    --border: rgba(0, 102, 212, 0.3);
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    backdrop-filter: blur(10px);
}

.upload-section {
    margin-top: 20px;
    text-align: center;
}

.upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 40px;
    border: 2px dashed var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
}

.upload-label:hover {
    border-color: var(--accent-blue);
    background: rgba(0, 102, 212, 0.1);
}

.upload-label i {
    font-size: 3rem;
    color: var(--accent-blue);
}

#imagePreview {
    max-width: 100%;
    max-height: 300px;
    margin-top: 20px;
    border-radius: 8px;
}

.tools-layout {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 20px;
    margin-top: 30px;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 10px;
}

.tab-btn {
    background: none;
    border: none;
    color: #888;
    padding: 8px 16px;
    cursor: pointer;
    transition: 0.3s;
}

.tab-btn.active {
    color: var(--accent-blue);
    border-bottom: 2px solid var(--accent-blue);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.control-group {
    margin-bottom: 20px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    color: #ddd;
    font-size: 0.9rem;
}

.input-row {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.input-row input {
    width: 50%;
    background: #000;
    border: 1px solid var(--border);
    padding: 8px;
    color: white;
    border-radius: 4px;
}

.btn-row {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.action-btn {
    width: 100%;
    background: var(--primary-blue);
    border: none;
    padding: 10px;
    color: white;
    border-radius: 4px;
    cursor: pointer;
    transition: 0.3s;
}

.action-btn:hover {
    background: var(--accent-blue);
}

.icon-btn {
    flex: 1;
    background: #222;
    border: 1px solid var(--border);
    color: white;
    padding: 10px;
    border-radius: 4px;
    cursor: pointer;
}

input[type="range"] {
    width: 100%;
}

textarea {
    width: 100%;
    height: 100px;
    background: #000;
    border: 1px solid var(--border);
    color: #888;
    padding: 10px;
    margin-top: 10px;
    border-radius: 4px;
    font-size: 0.8rem;
}

.canvas-container {
    width: 100%;
    background: #111;
    border-radius: 8px;
    overflow: auto;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

#mainCanvas {
    max-width: 100%;
}

.download-btn {
    width: 100%;
    margin-top: 20px;
    padding: 15px;
    background: #28a745;
    border: none;
    color: white;
    border-radius: 4px;
    font-weight: bold;
    cursor: pointer;
}

.download-btn:hover {
    background: #218838;
}

@media (max-width: 768px) {
    .tools-layout {
        grid-template-columns: 1fr;
    }
}