/* リセットとベーススタイル */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    line-height: 1.8;
    color: #333;
    background-color: #f9f9f9;
}

/* コンテナ */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ヘッダー */
header {
    background-color: #fff;
    border-bottom: 1px solid #e0e0e0;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

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

header .logo {
    font-size: 24px;
    font-weight: bold;
    color: #3B9FFF;
    text-decoration: none;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

nav a {
    text-decoration: none;
    color: #666;
    font-size: 14px;
    padding: 8px 12px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

nav a:hover {
    background-color: #3B9FFF;
    color: #fff;
}

/* メインコンテンツ */
main {
    min-height: calc(100vh - 180px);
}

section {
    scroll-margin-top: 80px;
}

/* ヒーローセクション */
.hero {
    background: linear-gradient(135deg, #5EC4FF 0%, #3B9FFF 100%);
    color: #fff;
    padding: 80px 20px;
    text-align: center;
}

.hero h1 {
    font-size: 32px;
    margin-bottom: 20px;
    font-weight: bold;
}

.catchphrase {
    font-size: 20px;
    font-weight: 300;
    opacity: 0.95;
}

/* 特徴セクション */
.features {
    padding: 60px 20px;
    background-color: #fff;
}

.features h2 {
    text-align: center;
    font-size: 28px;
    margin-bottom: 40px;
    color: #333;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.feature-card {
    background-color: #f9f9f9;
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #333;
}

.feature-card p {
    font-size: 15px;
    color: #666;
    line-height: 1.6;
}

/* CTAセクション */
.cta {
    background-color: #f5f5f5;
    padding: 60px 20px;
    text-align: center;
}

.cta h2 {
    font-size: 26px;
    margin-bottom: 20px;
    color: #333;
}

.cta p {
    font-size: 16px;
    color: #666;
    margin-bottom: 30px;
}

.button {
    display: inline-block;
    background-color: #3B9FFF;
    color: #fff;
    padding: 15px 40px;
    text-decoration: none;
    border-radius: 30px;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(59, 159, 255, 0.3);
}

.button:hover {
    background-color: #2B8FEF;
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(59, 159, 255, 0.4);
}

/* コンテンツセクション */
.content {
    padding: 60px 20px;
    background-color: #fff;
}

.content h2 {
    font-size: 32px;
    margin-bottom: 30px;
    color: #333;
    border-bottom: 3px solid #3B9FFF;
    padding-bottom: 15px;
}

.content h3 {
    font-size: 24px;
    margin-top: 40px;
    margin-bottom: 20px;
    color: #333;
}

.content h4 {
    font-size: 18px;
    margin-top: 30px;
    margin-bottom: 15px;
    color: #555;
}

.content p {
    margin-bottom: 20px;
    line-height: 1.8;
}

.content ul,
.content ol {
    margin-left: 30px;
    margin-bottom: 20px;
}

.content li {
    margin-bottom: 10px;
    line-height: 1.8;
}

.last-updated {
    font-size: 14px;
    color: #999;
    margin-bottom: 30px;
    text-align: right;
}

/* ポリシーセクション */
.policy-section {
    margin-bottom: 40px;
    padding: 25px;
    background-color: #f9f9f9;
    border-radius: 8px;
    border-left: 4px solid #3B9FFF;
}

.policy-section h3 {
    margin-top: 0;
    font-size: 20px;
    color: #3B9FFF;
}

.policy-section h4 {
    margin-top: 20px;
    font-size: 17px;
}

.policy-section ol {
    margin-left: 25px;
}

.policy-section ol li {
    margin-bottom: 15px;
}

/* サポートセクション */
.support-section {
    margin-bottom: 50px;
}

.contact-box {
    background-color: #f5f5f5;
    padding: 25px;
    border-radius: 8px;
    margin: 20px 0;
    border: 2px solid #3B9FFF;
}

.email {
    font-size: 18px;
    font-weight: bold;
    color: #3B9FFF;
    word-break: break-all;
}

.notice {
    font-size: 14px;
    color: #666;
    font-style: italic;
    margin-top: 15px;
}

/* FAQ */
.faq-item {
    margin-bottom: 30px;
    padding: 25px;
    background-color: #f9f9f9;
    border-radius: 8px;
    border-left: 4px solid #3B9FFF;
}

.faq-item h4 {
    margin-top: 0;
    margin-bottom: 15px;
    color: #333;
    font-size: 18px;
}

.faq-item p {
    margin-bottom: 0;
    color: #555;
}

/* フッター */
footer {
    background-color: #333;
    color: #fff;
    padding: 30px 20px;
    text-align: center;
    margin-top: 60px;
}

footer p {
    margin: 0;
    font-size: 14px;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 15px;
    }

    nav ul {
        justify-content: center;
        gap: 10px;
    }

    nav a {
        font-size: 13px;
        padding: 6px 10px;
    }

    .hero h1 {
        font-size: 26px;
    }

    .catchphrase {
        font-size: 18px;
    }

    .features h2 {
        font-size: 24px;
    }

    .feature-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .content h2 {
        font-size: 26px;
    }

    .content h3 {
        font-size: 20px;
    }

    .policy-section {
        padding: 20px;
    }

    .contact-box {
        padding: 20px;
    }

    .email {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    header .logo {
        font-size: 20px;
    }

    .hero {
        padding: 60px 15px;
    }

    .hero h1 {
        font-size: 22px;
    }

    .catchphrase {
        font-size: 16px;
    }

    .features,
    .cta,
    .content {
        padding: 40px 15px;
    }

    .button {
        padding: 12px 30px;
        font-size: 15px;
    }
}