body {
    font-family: 'Noto Sans JP', sans-serif;
    color: #333;
    background-color: #f9fafb;
}

.gradient-bg {
    background: linear-gradient(135deg, #84fab0 0%, #4cc1a3 50%, #338faa 100%);
}

.section {
    padding: 4rem 0;
}

.hero-pattern {
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%234cc1a3' fill-opacity='0.2'%3E%3Cpath d='M30 0h30v30H30zM0 30h30v30H0z'/%3E%3Cpath d='M0 0h30v30H0zM30 30h30v30H30z' fill-opacity='0.1'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.btn-primary {
    background: linear-gradient(135deg, #4CAF50 0%, #2196F3 100%);
    color: white;
    padding: 0.75rem 2rem;
    border-radius: 0.5rem;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.card {
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    background-color: white;
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.level-card {
    border-left: 5px solid;
    transition: all 0.3s ease;
}

.level-card.beginner {
    border-left-color: #4CAF50;
}

.level-card.intermediate {
    border-left-color: #2196F3;
}

.level-card.advanced {
    border-left-color: #673AB7;
}

.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 4px;
    background: linear-gradient(to bottom, #4CAF50, #2196F3, #673AB7);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    padding-left: 20px;
    margin-bottom: 30px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -28px;
    top: 0;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 4px solid #fff;
    background-color: #4cc1a3;
}

/* アニメーション用のスタイル */
.animate-fade-in {
    opacity: 0;
    animation: fadeIn 0.8s ease-out forwards;
}

.animate-fade-in-delay-1 {
    opacity: 0;
    animation: fadeIn 0.8s ease-out 0.3s forwards;
}

.animate-fade-in-delay-2 {
    opacity: 0;
    animation: fadeIn 0.8s ease-out 0.6s forwards;
}

.animate-fade-in-delay-3 {
    opacity: 0;
    animation: fadeIn 0.8s ease-out 0.9s forwards;
}

@keyframes fadeIn {
    from { 
        opacity: 0;
        transform: translateY(20px);
    }
    to { 
        opacity: 1;
        transform: translateY(0);
    }
}

/* スクロールダウンインジケーターのアニメーション */
@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.animate-bounce {
    animation: bounce 2s infinite;
}

/* ナビゲーションドット */
.nav-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.5);
    border: 2px solid #4CAF50;
    transition: all 0.3s ease;
    position: relative;
}

.nav-dot.active {
    background-color: #4CAF50;
    transform: scale(1.2);
}

/* セクションアニメーション */
.section {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease-out;
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}

/* カードホバーエフェクト改善 */
.card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* ボタンホバーエフェクト改善 */
.btn-primary {
    position: relative;
    overflow: hidden;
}

.btn-primary::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255,255,255,0.2), transparent);
    transform: translateX(-100%);
}

.btn-primary:hover::after {
    transform: translateX(100%);
    transition: all 0.6s ease;
}