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

:root {
    /* ライトモード */
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --text-primary: #333;
    --text-secondary: #555;
    --border-color: #ddd;
    --input-disabled-bg: #f0f0f0;
    --input-disabled-border: #999;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --button-hover-bg: rgba(0, 0, 0, 0.05);
}

body.dark-mode {
    /* ダークモード */
    --bg-primary: #1e1e1e;
    --bg-secondary: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --border-color: #444;
    --input-disabled-bg: #3a3a3a;
    --input-disabled-border: #555;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --button-hover-bg: rgba(255, 255, 255, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px var(--shadow-color);
    position: relative;
}

header h1 {
    font-size: 2em;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.1em;
    opacity: 0.9;
}

.theme-toggle {
    position: absolute;
    top: 15px;
    right: 15px;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.theme-icon {
    transition: transform 0.3s;
}

.form-section {
    background: var(--bg-secondary);
    padding: 30px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow-color);
    transition: background-color 0.3s;
}

.form-section h2 {
    font-size: 1.5em;
    margin-bottom: 20px;
    color: #667eea;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

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

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-secondary);
    transition: color 0.3s;
}

.input-wrapper {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

input[type="text"],
textarea,
select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: border-color 0.3s, background-color 0.3s, color 0.3s;
}

input[type="text"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: #667eea;
}

input[type="text"].option-selected,
textarea.option-selected,
select.option-selected {
    background-color: var(--input-disabled-bg);
    border-color: var(--input-disabled-border);
}

select {
    cursor: pointer;
}

textarea {
    resize: vertical;
    min-height: 80px;
}

.option-buttons {
    display: flex;
    gap: 10px;
}

.option-btn {
    padding: 8px 16px;
    border: 2px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.3s;
}

.option-btn:hover {
    border-color: #667eea;
    color: #667eea;
    background: var(--button-hover-bg);
}

.option-btn.active {
    background: #667eea;
    border-color: #667eea;
    color: white;
}

.action-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 30px;
}

.btn {
    padding: 14px 30px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
}

.output-area {
    margin-top: 40px;
}

.output-area > h2 {
    font-size: 1.8em;
    margin-bottom: 20px;
    color: #667eea;
    text-align: center;
}

.output-section {
    background: var(--bg-secondary);
    padding: 25px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow-color);
    transition: background-color 0.3s;
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #667eea;
}

.output-header h3 {
    font-size: 1.3em;
    color: #667eea;
}

.output-actions {
    display: flex;
    gap: 10px;
}

.output-content {
    background: var(--bg-primary);
    padding: 20px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    line-height: 1.6;
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
    max-height: 500px;
    overflow-y: auto;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    header h1 {
        font-size: 1.5em;
    }

    .form-section {
        padding: 20px;
    }

    .output-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .output-actions {
        width: 100%;
    }

    .btn-small {
        flex: 1;
    }
}

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

.output-content::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

.output-content::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

.output-content::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* ダークモード時のスクロールバー */
body.dark-mode .output-content::-webkit-scrollbar-thumb {
    background: #555;
}

body.dark-mode .output-content::-webkit-scrollbar-thumb:hover {
    background: #777;
}