/* 基本設定 */
body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.8;
    color: #333;
    margin: 0;
    background-color: #fff;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 30px;
}

/* ヘッダー */
.page-header {
    background-color: #e60012; /* メディアミックスソリューションズのブランドカラーをイメージ */
    color: #fff;
    padding: 80px 0;
    text-align: center;
    border-bottom: 8px solid #b3000e; /* 深みのある赤でアクセント */
}

.company-name {
    font-size: 1.1rem;
    font-weight: bold;
    letter-spacing: 0.1em;
    margin-bottom: 15px;
    text-transform: uppercase;
}

.page-header h1 {
    margin: 0;
    font-size: 2.2rem;
    letter-spacing: 0.05em;
    font-weight: 700;
}

/* イントロ */
.intro-section {
    padding: 100px 0;
    text-align: center;
    background-color: #fdfdfd;
}

.lead-text {
    font-size: 1.3rem;
    font-weight: bold;
    color: #333;
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-bottom: 30px;
}

.lead-text::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 4px;
    background-color: #e60012;
}

/* 宣言リスト */
.declaration-section {
    padding: 80px 0;
    background-color: #fff;
}

.declaration-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 30px;
}

@media (max-width: 600px) {
    .declaration-grid {
        grid-template-columns: 1fr;
    }
}

.declaration-item {
    background: #fff;
    padding: 50px;
    border: 1px solid #eee;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.declaration-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(230, 0, 18, 0.1);
}

.declaration-item::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: #e60012;
}

.declaration-item .number {
    display: block;
    font-size: 2.5rem;
    color: rgba(230, 0, 18, 0.1); /* 薄い赤の巨大数字 */
    font-weight: 700;
    position: absolute;
    top: 10px;
    right: 20px;
}

.declaration-item h3 {
    margin-top: 0;
    color: #e60012;
    font-size: 1.4rem;
    margin-bottom: 20px;
}

/* ガイドライン */
.guideline-section {
    padding: 100px 0;
    background-color: #f9f9f9;
}

.guideline-box {
    background-color: #fff;
    padding: 60px;
    border-radius: 4px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.guideline-box h2 {
    text-align: center;
    color: #333;
    margin-bottom: 40px;
    font-size: 1.8rem;
    position: relative;
}

.guideline-box ul {
    list-style: none;
    padding: 0;
    max-width: 800px;
    margin: 0 auto;
}

.guideline-box li {
    padding: 20px 0;
    border-bottom: 1px solid #eee;
    position: relative;
    padding-left: 25px;
}

.guideline-box li::before {
    content: "■";
    position: absolute;
    left: 0;
    color: #e60012;
}

.guideline-box li:last-child {
    border-bottom: none;
}

.guideline-box li strong {
    color: #e60012;
    display: inline-block;
    width: 200px;
}

@media (max-width: 600px) {
    .guideline-box li strong {
        display: block;
        width: 100%;
        margin-bottom: 5px;
    }
}

/* フッター */
.page-footer {
    background-color: #1a1a1a;
    color: #888;
    text-align: center;
    padding: 40px 0;
    font-size: 0.85rem;
}