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

:root {
    --primary-color: #9146ff;
    --secondary-color: #ff6b6b;
    --success-color: #4ecdc4;
    --bg-color: #0e0e10;
    --card-bg: #18181b;
    --text-primary: #efeff1;
    --text-secondary: #adadb8;
    --border-color: #3a3a3d;
    --hover-color: #772ce8;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 0;
    background: var(--gradient-1);
    background-clip: text;
    -webkit-background-clip: text;
}

h1 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.icon {
    font-size: 48px;
    filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.3));
}

.title-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.title-main {
    font-size: 32px;
    font-weight: bold;
    color: transparent;
    background: var(--gradient-1);
    background-clip: text;
    -webkit-background-clip: text;
}

.title-sub {
    font-size: 18px;
    color: var(--text-secondary);
    font-weight: normal;
}

.description {
    color: var(--text-secondary);
    font-size: 16px;
}

main {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.controls {
    display: grid;
    gap: 20px;
    margin-bottom: 30px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 14px;
}

select, input[type="text"] {
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-color);
    color: var(--text-primary);
    font-size: 16px;
    transition: all 0.3s ease;
}

select:hover, input[type="text"]:hover {
    border-color: var(--primary-color);
}

select:focus, input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(145, 70, 255, 0.2);
}

.button-group {
    display: flex;
    gap: 12px;
    margin-top: 10px;
}

button {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.primary-btn:hover {
    background: var(--hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(145, 70, 255, 0.4);
}

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

.secondary-btn:hover {
    background: #4a4a4d;
}

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

.btn-icon {
    font-size: 18px;
}

.output-section {
    margin-bottom: 30px;
}

.comment-display {
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    position: relative;
    overflow: hidden;
}

.comment-display::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--gradient-2);
    border-radius: 12px;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.comment-display:has(.generated-comment)::before {
    opacity: 0.3;
}

.placeholder {
    color: var(--text-secondary);
    font-style: italic;
}

.generated-comment {
    font-size: 24px;
    font-weight: 500;
    text-align: center;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.copy-btn {
    background: var(--success-color);
    color: white;
    width: 100%;
}

.copy-btn:hover:not(:disabled) {
    background: #45b7b8;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(78, 205, 196, 0.4);
}

.copy-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.history-section {
    margin-bottom: 30px;
}

.history-section h3 {
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
    max-height: 300px;
    overflow-y: auto;
}

.history-item {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s ease;
}

.history-item:hover {
    border-color: var(--primary-color);
}

.small-copy-btn {
    padding: 4px 8px;
    font-size: 14px;
    background: transparent;
    border: 1px solid var(--border-color);
}

.small-copy-btn:hover {
    background: var(--border-color);
}

.clear-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    font-size: 14px;
}

.clear-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.tips-section {
    background: var(--bg-color);
    border-radius: 8px;
    padding: 20px;
    margin-top: 30px;
}

.tips-section h3 {
    margin-bottom: 12px;
    color: var(--success-color);
}

.tips-section ul {
    list-style: none;
    padding-left: 0;
}

.tips-section li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    color: var(--text-secondary);
}

.tips-section li::before {
    content: '•';
    position: absolute;
    left: 8px;
    color: var(--success-color);
}

footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 14px;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* スクロールバー */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* レスポンシブ */
@media (max-width: 600px) {
    .container {
        padding: 10px;
    }
    
    main {
        padding: 20px;
    }
    
    .title-main {
        font-size: 24px;
    }
    
    .title-sub {
        font-size: 14px;
    }
    
    .generated-comment {
        font-size: 20px;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    button {
        width: 100%;
    }
}