* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background: white;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
}

.header-buttons {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-primary {
    background: #4f46e5;
    color: white;
}

.btn-success {
    background: #10b981;
    color: white;
}

.btn-secondary {
    background: #6b7280;
    color: white;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.main-content {
    display: grid;
    grid-template-columns: 250px 1fr 300px;
    gap: 1rem;
    padding: 1rem;
    flex: 1;
    overflow: hidden;
}

.sidebar {
    background: #f9fafb;
    border-radius: 12px;
    padding: 1.5rem;
    overflow-y: auto;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.sidebar h3 {
    margin-bottom: 1rem;
    color: #374151;
    font-size: 1.1rem;
}

.block-creator {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.block-creator textarea {
    width: 100%;
    min-height: 120px;
    padding: 0.75rem;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    resize: vertical;
    margin-bottom: 0.75rem;
    transition: border-color 0.2s ease;
}

.block-creator textarea:focus {
    outline: none;
    border-color: #667eea;
}

.btn-block {
    width: 100%;
}

#customBlocksList {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.custom-block-item {
    background: white;
    padding: 0.75rem;
    border-radius: 8px;
    border-left: 4px solid #667eea;
    cursor: pointer;
    transition: all 0.2s ease;
}

.custom-block-item:hover {
    transform: translateX(4px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.workspace-container {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

#blocklyDiv {
    width: 100%;
    height: 100%;
}

.code-preview {
    background: #1e293b;
    border-radius: 12px;
    padding: 1.5rem;
    overflow-y: auto;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
}

.code-preview h3 {
    color: #e2e8f0;
    margin-bottom: 1rem;
}

.code-preview pre {
    flex: 1;
    background: #0f172a;
    padding: 1rem;
    border-radius: 8px;
    overflow: auto;
    margin-bottom: 1rem;
}

.code-preview code {
    color: #e2e8f0;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
}

/* 토스트 메시지 */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: #10b981;
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    font-weight: 600;
    opacity: 0;
    transform: translateY(100px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.loading {
    text-align: center;
    padding: 1rem;
    margin-top: 0.5rem;
}

.loading p {
    font-size: 0.875rem;
    color: #6b7280;
}

.spinner {
    border: 4px solid #f3f4f6;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 반응형 디자인 */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 200px 1fr;
        grid-template-rows: 1fr auto;
    }

    .code-preview {
        grid-column: 1 / -1;
        max-height: 200px;
    }
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 1rem;
    }

    .main-content {
        grid-template-columns: 1fr;
    }

    .sidebar {
        max-height: 150px;
    }
}