/* observation_event_list.html 専用スタイル */

/* ページヘッダー */
.page-header {
    margin-top: 80px;
    padding: 0;
    background: url('../Images/ObservationEventsImage.jpg') center/cover no-repeat;
    position: relative;
    overflow: hidden;
    width: 100%;
    aspect-ratio: 4 / 1;
}

.page-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
}

.page-header-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    padding: 0 2rem;
    text-align: center;
    z-index: 1;
}

.page-title {
    font-family: 'Noto Serif JP', serif;
    font-size: clamp(1.5rem, 4vw, 3rem);
    font-weight: 700;
    color: white;
    margin-bottom: 0.5rem;
    text-align: center;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.6), 0 0 20px rgba(0, 0, 0, 0.4);
}

.page-subtitle {
    font-size: clamp(0.8rem, 2vw, 1.2rem);
    color: rgba(255, 255, 255, 0.98);
    text-align: center;
    font-weight: 400;
    text-shadow: 1px 1px 6px rgba(0, 0, 0, 0.6), 0 0 15px rgba(0, 0, 0, 0.4);
}

/* イベントリスト */
.events-section {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.year-section {
    margin-bottom: 4rem;
}

.year-title {
    font-family: 'Noto Serif JP', serif;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-green);
    margin-bottom: 2rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--light-green);
    display: inline-block;
}

.event-list {
    display: grid;
    gap: 1.5rem;
}

.event-item {
    background: white;
    border-radius: 15px;
    padding: 1.8rem 2rem;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-left: 4px solid var(--light-green);
}

.event-item:hover {
    transform: translateX(8px);
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.12);
    border-left-color: var(--forest-green);
}

.event-item a {
    text-decoration: none;
    color: var(--text-dark);
    display: block;
}

.event-info {
    flex: 1;
}

.event-date {
    font-weight: 600;
    color: var(--forest-green);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.event-title {
    font-size: 1.1rem;
    color: var(--text-dark);
    font-weight: 500;
    line-height: 1.6;
}

/* レスポンシブ（イベントリスト専用） */
@media (max-width: 968px) {
    .page-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 640px) {
    .events-section {
        padding: 3rem 1.5rem;
    }

    .page-title {
        font-size: 2rem;
    }

    .year-title {
        font-size: 1.6rem;
    }

    .event-item {
        padding: 1.5rem;
    }
}