/* ============================================
   全体設定
   ============================================ */
body { 
    margin: 0; 
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    line-height: 1.8;
    color: #333;
    background-color: #2c3e50; /* 背景をメニュー色に合わせる */
}

/* レイアウト */
table.layout { 
    border-collapse: collapse; 
    width: 100%;
    background-color: #fff;
}

/* ============================================
   サイドメニュー
   ============================================ */
td.menu-cell { 
    background-color: #2c3e50; 
    vertical-align: top;
}

.sidebar {
    padding: 30px 20px;
    color: #fff;
    position: sticky;
    top: 0;
}

.sidebar b {
    font-size: 1.2rem;
    display: block;
    margin-bottom: 15px;
    letter-spacing: 0.1em;
}

.sidebar a { 
    color: #bdc3c7; 
    text-decoration: none; 
    display: block; 
    padding: 12px 15px;
    margin-bottom: 5px;
    border-radius: 6px;
    transition: 0.3s;
}

.sidebar a:hover { 
    background-color: #34495e;
    color: #fff;
}

/* ============================================
   メインコンテンツエリア
   ============================================ */
td.main-content {
    background-color: #fff;
    padding: 60px 50px;
    border-radius: 30px 0 0 0; /* 左上を丸く */
}

h1 { 
    font-size: 2rem;
    margin-bottom: 40px;
    color: #2c3e50;
}

h2 { 
    border-left: 8px solid #e67e22; /* アクセントのオレンジ */
    padding: 5px 0 5px 20px;
    margin: 50px 0 30px 0;
    font-size: 1.6rem;
}

.lead-text {
    font-size: 1.1rem;
    font-weight: bold;
    color: #555;
}

/* ============================================
   「塾について」用：特徴カード・リスト
   ============================================ */
.feature-grid { 
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin: 30px 0;
}

.feature-card { 
    padding: 25px; 
    border: 1px solid #eee; 
    border-radius: 12px; 
    background: #fff;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

/* 箇条書きリスト（オレンジの四角） */
ul.flow-list, ul.goal-list {
    list-style: none;
    padding-left: 0;
}

ul.flow-list li, ul.goal-list li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 15px;
}

ul.flow-list li::before, ul.goal-list li::before {
    content: "■";
    position: absolute;
    left: 0;
    color: #e67e22;
    font-size: 0.8rem;
    top: 2px;
}

/* ============================================
   「コンテンツ」用：グリッド表示
   ============================================ */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.content-box {
    border: 1px solid #eee;
    padding: 25px;
    border-radius: 15px;
    background-color: #fff;
    box-shadow: 0 4px 10px rgba(0,0,0,0.03);
    transition: transform 0.2s ease-in-out;
}

.content-box:hover {
    transform: translateY(-5px);
    border-color: #e67e22;
}

.content-box h2 {
    margin-top: 0;
    border-left: 5px solid #2c3e50;
    font-size: 1.3rem;
    padding: 0 0 0 15px;
}

.box-desc {
    font-size: 0.9rem;
    color: #e67e22;
    font-weight: bold;
    margin-bottom: 15px;
}

.content-box ul {
    list-style: none;
    padding-left: 0;
}

.content-box li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.content-box li::before {
    content: "・";
    position: absolute;
    left: 0;
    color: #2c3e50;
    font-weight: bold;
}

/* ============================================
   スマホ対応 (レスポンシブ)
   ============================================ */
@media (max-width: 850px) {
    /* テーブルを縦並びに */
    table.layout, table.layout tr, table.layout td {
        display: block;
        width: 100% !important;
    }
    
    td.main-content {
        padding: 40px 20px;
        border-radius: 0;
    }
    
    .sidebar {
        padding: 20px;
        position: static; /* スマホでは固定しない */
    }
    
    .sidebar a {
        display: inline-block;
        margin: 5px;
        background-color: #34495e;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
    }
}