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

:root {
    --primary-color: #4A90E2;
    --secondary-color: #F5F7FA;
    --text-primary: #2C3E50;
    --text-secondary: #7F8C8D;
    --border-color: #E1E8ED;
    --success-color: #27AE60;
    --hover-color: #3498DB;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
    --radius: 8px;
    --radius-lg: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 40px 0;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
    margin-bottom: 20px;
}

.lang-switcher {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}

.lang-btn {
    padding: 8px 16px;
    border: 2px solid rgba(255,255,255,0.3);
    background: rgba(255,255,255,0.1);
    color: white;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    font-weight: 500;
}

.lang-btn:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.lang-btn.active {
    background: white;
    color: var(--primary-color);
    border-color: white;
}

main {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 30px;
    margin-bottom: 40px;
}

.controls-panel {
    background: white;
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow-lg);
    max-height: 80vh;
    overflow-y: auto;
}

.control-group {
    margin-bottom: 25px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.control-group select {
    width: 100%;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.95rem;
    transition: border-color 0.3s ease;
    background: white;
    cursor: pointer;
}

.control-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.color-input-wrapper {
    display: flex;
    gap: 10px;
}

.color-input-wrapper input[type="color"] {
    width: 60px;
    height: 40px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    transition: transform 0.2s ease;
}

.color-input-wrapper input[type="color"]:hover {
    transform: scale(1.05);
}

.color-input-wrapper input[type="text"] {
    flex: 1;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    transition: border-color 0.3s ease;
}

.color-input-wrapper input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

.slider-wrapper {
    display: flex;
    align-items: center;
    gap: 15px;
}

.slider-wrapper input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
}

.slider-wrapper input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: background 0.3s ease;
}

.slider-wrapper input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--hover-color);
}

.slider-wrapper span {
    min-width: 50px;
    text-align: right;
    font-weight: 600;
    color: var(--text-secondary);
}

.button-group {
    display: flex;
    gap: 10px;
    margin-top: 30px;
}

.btn {
    flex: 1;
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--hover-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--secondary-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: #E1E8ED;
    transform: translateY(-2px);
}

.preview-panel {
    background: white;
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow-lg);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.preview-header h2 {
    font-size: 1.3rem;
    color: var(--text-primary);
}

.preview-controls {
    display: flex;
    gap: 5px;
}

.preview-size-btn {
    padding: 6px 12px;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.preview-size-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.preview-size-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.preview-area {
    width: 100%;
    height: 400px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    transition: height 0.3s ease;
}

.preview-area.preview-small {
    height: 300px;
}

.preview-area.preview-medium {
    height: 400px;
}

.preview-area.preview-large {
    height: 500px;
}

.export-section {
    background: white;
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 40px;
}

.export-section h2 {
    margin-bottom: 20px;
    color: var(--text-primary);
}

.export-tabs {
    display: flex;
    gap: 5px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    padding: 10px 20px;
    background: none;
    border: none;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    position: relative;
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    color: var(--primary-color);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-color);
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.code-output {
    background: #2C3E50;
    border-radius: var(--radius);
    overflow: hidden;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: rgba(0,0,0,0.2);
    color: white;
}

.copy-btn {
    padding: 6px 12px;
    background: var(--success-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.copy-btn:hover {
    background: #229954;
    transform: translateY(-2px);
}

.code-output pre {
    padding: 20px;
    overflow-x: auto;
    max-height: 300px;
}

.code-output code {
    color: #F8F8F2;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

.download-options {
    padding: 20px;
}

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

.download-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.download-group input {
    width: 100%;
    max-width: 300px;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.95rem;
    transition: border-color 0.3s ease;
}

.download-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.download-buttons {
    display: flex;
    gap: 15px;
}

.presets-section {
    background: white;
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 40px;
}

.presets-section h2 {
    margin-bottom: 20px;
    color: var(--text-primary);
}

.presets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 20px;
}

.preset-item {
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.preset-item:hover {
    transform: translateY(-5px);
}

.preset-item svg {
    width: 100%;
    height: 80px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s ease;
}

.preset-item:hover svg {
    box-shadow: var(--shadow-md);
}

.preset-item span {
    display: block;
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

footer {
    text-align: center;
    padding: 30px 0;
    color: white;
    opacity: 0.9;
}

.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--success-color);
    color: white;
    padding: 15px 25px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    font-weight: 600;
    z-index: 1000;
}

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

/* スクロールバーのスタイリング */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--secondary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* レスポンシブデザイン */
@media (max-width: 1024px) {
    main {
        grid-template-columns: 1fr;
    }
    
    .controls-panel {
        max-height: none;
    }
    
    .preview-area {
        height: 300px;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .container {
        padding: 15px;
    }
    
    .controls-panel,
    .preview-panel,
    .export-section,
    .presets-section {
        padding: 20px;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .download-buttons {
        flex-direction: column;
    }
    
    .presets-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
}