/* リセット */
ul, ol, li, h1, h2, h3, h4, h5, h6, p, img {
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Arial', sans-serif;
    color: #333;
    background-color: #f4f6f9;
    margin: 0;
    padding: 0;
}

/* ヘッダー */
.header-container {
    background-color: #012b57;
    width: 100%;
    padding: 48px 0 40px;
}

.header-image {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

h1 {
    color: #ffffff;
    font-size: 2.6em;
    text-align: center;
    font-family: 'Arial', sans-serif;
    font-weight: bold;
    letter-spacing: 0.02em;
}

.header-subtitle {
    color: #a8c4e0;
    font-size: 1.0em;
    text-align: center;
    font-family: 'Arial', sans-serif;
    letter-spacing: 0.05em;
}

/* ナビゲーション */
.app-nav {
    display: flex;
    justify-content: center;
    background-color: #ffffff;
    border-bottom: 1px solid #dde3ea;
    padding: 0;
}

.app-nav ul {
    list-style-type: none;
    padding: 0;
    display: flex;
    gap: 0;
}

.app-nav ul li a {
    display: block;
    text-decoration: none;
    font-weight: bold;
    font-size: 0.95em;
    font-family: 'Arial', sans-serif;
    color: #012b57;
    padding: 1rem 2rem;
    border-bottom: 3px solid transparent;
    transition: border-color 0.2s;
}

.app-nav ul li a:hover {
    border-bottom-color: #1d81da;
}

/* コンテンツ */
.content {
    background-color: #ffffff;
    border-radius: 6px;
    margin: 32px auto;
    padding: 40px 48px;
    max-width: 800px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

h2 {
    color: #012b57;
    font-size: 1.1em;
    margin-bottom: 0;
    margin-top: 1.8em;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

h2:first-child {
    margin-top: 0;
}

p {
    line-height: 1.75;
    margin-top: 10px;
    color: #444;
}

/* 横棒 */
.horizontal-line {
    height: 3px;
    background-color: #1d81da;
    width: 100%;
    margin: 6px 0 12px;
}

/* CTAボタン */
.cta {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 40px;
}

.cta-button {
    display: inline-block;
    background-color: #012b57;
    color: white;
    text-align: center;
    padding: 14px 56px;
    text-decoration: none;
    border-radius: 4px;
    font-weight: bold;
    font-size: 1.0em;
    letter-spacing: 0.04em;
    transition: background-color 0.2s;
}

.cta-button:hover {
    background-color: #1d81da;
}

/* フッター */
footer {
    text-align: center;
    padding: 24px;
    color: #999;
    font-size: 0.85em;
}

@media (max-width: 700px) {
    .content {
        margin: 16px;
        padding: 24px 20px;
    }
    h1 {
        font-size: 1.6em;
    }
    .app-nav ul {
        flex-direction: column;
    }
}