body {
    font-family: 'Noto Sans JP', sans-serif;
    background: linear-gradient(to bottom, #9bd9ff, #c3e6ff);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* 背景画像スタイル */
.sky-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    overflow: hidden;
}

/* 背景画像の設定 */
.sky-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('../images/sky2.png');
    background-size: cover;
    background-position: center;
    opacity: 0.5; /* アルファ値0.75 */
    z-index: -1;
}

.cloud {
    position: absolute;
    opacity: 0.8;
    z-index: 1;
}

.airplane {
    position: absolute;
    z-index: 2;
    width: 100px;
    filter: drop-shadow(2px 4px 6px rgba(0, 0, 0, 0.1));
    transform: scale(0.7);
}

.birds {
    position: absolute;
    z-index: 2;
    opacity: 0.7;
}

.content-wrapper {
    position: relative;
    z-index: 5;
}

@media (max-width: 640px) {
    /* スマホ表示時のヘッダー調整 */
    header {
        padding: 8px 0;
    }
    
    header img.logo {
        height: 28px;
    }
    
    /* スマホ表示時のフッター固定メニュー */
    .mobile-fixed-menu {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background-color: white;
        box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
        z-index: 999;
        padding: 10px;
        justify-content: space-around;
        transform: translateZ(0);
        -webkit-transform: translateZ(0);
        will-change: transform;
    }
    
    /* フッターの余白調整 */
    footer {
        padding-bottom: 70px;
    }
}

/* ヘッダー調整 */
header {
    background-color: white;
    box-shadow: 0 1px 5px rgba(0,0,0,0.1);
}

/* PCヘッダー用スタイル */
@media (min-width: 641px) {
    header {
        padding: 0.75rem 1rem;
    }
    
    header .pc-header-content {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    header .logo-wrapper {
        margin-bottom: 0;
    }
    
    header .nav-buttons {
        display: flex;
        gap: 1.25rem;
    }
}

/* スマホヘッダー用スタイル */
@media (max-width: 640px) {
    header {
        padding: 8px 0;
        text-align: center;
    }
    
    header img.logo {
        height: 28px;
        margin: 0 auto;
    }
    
    header .nav-buttons {
        display: none;
    }
}

/* ロゴ画像のスタイル */
header img.logo {
    height: 36px;
    margin: 0 auto;
}

/* ロゴ横のアクティブラーニングテキストのスタイル */
.logo-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
}

.active-learning-text {
    font-size: 14px;
    font-weight: bold;
    color: #3182ce;
    background-color: rgba(235, 248, 255, 0.8);
    padding: 4px 8px;
    border-radius: 4px;
    white-space: nowrap;
    border-left: 3px solid #3182ce;
}

@media (max-width: 640px) {
    .active-learning-text {
        font-size: 12px;
        padding: 2px 6px;
    }
}

/* ヒーローセクションのスタイル */
.hero-section {
    position: relative;
    height: 100vh;
    overflow: hidden;
}

.hero-image-container {
    position: relative;
    height: 100%;
}

.hero-overlay {
    background: linear-gradient(45deg, rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.2));
}

.hero-content {
    z-index: 10;
}

.hero-project-title {
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
    animation: fadeInUp 1s ease-out 0.1s both;
}

.hero-title {
    text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.8);
    animation: fadeInUp 1s ease-out 0.3s both;
}

.hero-subtitle {
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
    animation: fadeInUp 1s ease-out 0.5s both;
}

.hero-btn {
    animation: pulse 2s infinite;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(239, 68, 68, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(239, 68, 68, 0);
    }
}

/* セクションタイトルのスタイル */
.section-title {
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(to right, #f59e0b, #ef4444);
    border-radius: 2px;
}

/* カードのホバー効果 */
.learning-card, .location-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.learning-card:hover, .location-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

/* 開催概要テーブルのスタイル */
.overview-table {
    display: flex;
    flex-direction: column;
    gap: 0;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    border: 2px solid #e5e7eb;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.overview-row {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 16px;
    padding: 14px 16px;
    border-bottom: 1px solid #e5e7eb;
    align-items: start;
    background: white;
}

.overview-row:last-child {
    border-bottom: none;
}

.overview-label {
    font-weight: bold;
    color: #1e40af;
    font-size: 14px;
    white-space: nowrap;
    display: flex;
    align-items: flex-start;
    padding-top: 2px;
    background: #eff6ff;
    padding: 8px 12px;
    margin: -6px -8px;
    border-radius: 4px;
    border: 1px solid #dbeafe;
}

.overview-label::after {
    content: "：";
    margin-left: 2px;
}

.overview-content {
    color: #1f2937;
    font-size: 14px;
    line-height: 1.6;
    font-weight: 500;
}

/* レスポンシブ調整（開催概要） */
@media (max-width: 640px) {
    .overview-row {
        grid-template-columns: 90px 1fr;
        gap: 12px;
        padding: 12px 14px;
    }
    
    .overview-label {
        font-size: 13px;
        padding: 6px 10px;
        margin: -4px -6px;
    }
    
    .overview-content {
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .overview-table {
        border: 1px solid #e5e7eb;
    }
    
    .overview-row {
        grid-template-columns: 1fr;
        gap: 6px;
        padding: 12px 16px;
    }
    
    .overview-label {
        font-size: 14px;
        font-weight: bold;
        color: #1e40af;
        background: #eff6ff;
        padding: 6px 10px;
        margin: 0;
        border-radius: 4px;
        border: 1px solid #dbeafe;
        text-align: center;
    }
    
    .overview-content {
        margin-top: 4px;
        padding-left: 8px;
    }
}

/* レスポンシブ調整 */
@media (max-width: 768px) {
    .hero-section {
        height: 70vh;
    }
    
    .hero-title {
        font-size: 2.5rem;
        line-height: 1.1;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    /* モバイルでのイベント概要カード調整 */
    .section-2 .bg-yellow-50,
    .section-3 .bg-blue-50 {
        margin-bottom: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-section {
        height: 60vh;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-btn {
        font-size: 1rem;
        padding: 12px 24px;
    }
}