/* 共通スタイルシート */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ヘッダー・ナビゲーション */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: white;
}

.nav-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.nav-link:hover {
    background-color: rgba(255,255,255,0.2);
}

.back-btn {
    background-color: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.3);
}

/* メインコンテンツ */
.main {
    padding: 2rem 0;
    min-height: calc(100vh - 120px);
}

.page-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-align: center;
    color: #333;
}

.page-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    text-align: center;
    color: #666;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section {
    background: white;
    margin: 2rem 0;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.section-title {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: #333;
    border-bottom: 2px solid #667eea;
    padding-bottom: 0.5rem;
}

/* カード レイアウト */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.card {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.card-title {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.card-description {
    color: #666;
    margin-bottom: 1rem;
}

.card-link {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    padding: 0.7rem 1.5rem;
    border-radius: 5px;
    transition: opacity 0.3s;
}

.card-link:hover {
    opacity: 0.9;
}

/* フォーム */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
    color: #333;
}

.form-input {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-input:focus {
    outline: none;
    border-color: #667eea;
}

.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: opacity 0.3s;
}

.btn:hover {
    opacity: 0.9;
}

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

/* テキストエリア */
.textarea {
    width: 100%;
    min-height: 300px;
    padding: 1rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-family: monospace;
    font-size: 0.9rem;
    resize: vertical;
}

/* リスト */
.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    background: #f8f9fa;
    margin: 0.5rem 0;
    padding: 1rem;
    border-left: 4px solid #667eea;
    border-radius: 5px;
}

/* フッター */
.footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}

/* レスポンシブ */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .page-title {
        font-size: 2rem;
    }

    .nav {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        justify-content: center;
    }

    .section {
        padding: 1.5rem;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }
}

/* 特殊要素 */
.alert {
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 5px;
    border-left: 4px solid;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border-color: #17a2b8;
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border-color: #ffc107;
}

.text-center {
    text-align: center;
}

.text-muted {
    color: #6c757d;
}

.mt-2 { margin-top: 1rem; }
.mb-2 { margin-bottom: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-3 { margin-bottom: 1.5rem; }