* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
    background-color: #ffffff;
    color: #333333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* ヘッダーセクション */
.header {
    text-align: center;
    margin-bottom: 60px;
}

.title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #D4AF37 0%, #FFD700 50%, #D4AF37 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 2px;
    text-shadow: 0 2px 10px rgba(212, 175, 55, 0.2);
}

.subtitle {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 10px;
    color: #D4AF37;
}

.description {
    font-size: 18px;
    color: #555555;
    font-weight: 400;
}

/* 動画セクション */
.video-section {
    margin-bottom: 60px;
}

.section-title {
    font-size: 28px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 30px;
    color: #000000;
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    background-color: #f5f5f5;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border: 2px solid #D4AF37;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 8px;
}

/* CTAセクション */
.cta-section {
    text-align: center;
}

.line-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background-color: #06C755;
    color: #ffffff;
    padding: 18px 50px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 20px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(6, 199, 85, 0.3);
    border: 2px solid #D4AF37;
}

.line-button:hover {
    background-color: #05b04d;
    box-shadow: 0 6px 20px rgba(6, 199, 85, 0.4);
    transform: translateY(-2px);
}

.line-button:active {
    transform: translateY(0);
}

.line-icon {
    width: 28px;
    height: 28px;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .container {
        padding: 30px 15px;
    }

    .title {
        font-size: 32px;
    }

    .subtitle {
        font-size: 20px;
    }

    .description {
        font-size: 16px;
    }

    .section-title {
        font-size: 24px;
    }

    .line-button {
        padding: 16px 40px;
        font-size: 18px;
    }

    .line-icon {
        width: 24px;
        height: 24px;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 28px;
    }

    .subtitle {
        font-size: 18px;
    }

    .description {
        font-size: 14px;
    }

    .section-title {
        font-size: 20px;
    }

    .line-button {
        padding: 14px 35px;
        font-size: 16px;
    }
}