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

body {
    font-family: 'Noto Sans JP', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #faf9f7;
    font-smoothing: antialiased;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 明朝体を大きい文字・見出しに適用 */
h1, h2, h3, h4, h5, h6,
.hero-title, .hero-subtitle, .hero-description,
.seminar-title, .seminar-date,
.event-title, .location-name {
    font-family: 'Noto Serif JP', 'Times New Roman', serif !important;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header and Navigation styles moved to common.css */

/* Hero Section */
.hero-section {
    display: flex;
    align-items: center;
    min-height: 100vh;
    margin-top: 80px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('../images/seminar-main.jpg') center/cover;
    opacity: 0.8;
    z-index: 1;
    filter: sepia(15%) saturate(85%) brightness(95%);
}

.hero-content {
    flex: 1;
    padding: 80px 60px;
    position: relative;
    z-index: 2;
    background: rgba(245, 241, 235, 0.95);
    backdrop-filter: blur(10px);
    margin-left: 5%;
    max-width: 500px;
}

.hero-title {
    font-size: 3rem;
    font-weight: 300;
    color: #8B4513;
    margin-bottom: 20px;
    line-height: 1.2;
    letter-spacing: 3px;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 30px;
    font-style: italic;
}

.hero-description {
    font-size: 1.1rem;
    color: #555;
    line-height: 1.8;
}

.hero-image {
    display: none;
}

.hero-text {
    display: none;
}

.hero-small-text {
    font-size: 13px;
    margin-bottom: 8px;
    color: #8B4513;
    opacity: 0.8;
}

.hero-main-text {
    font-size: 16px;
    font-weight: 600;
    color: #8B4513;
    line-height: 1.4;
}

/* Seminar Information */
.seminar-info {
    padding: 80px 0;
    background: linear-gradient(135deg, #ffffff 0%, #fafafa 100%);
    text-align: center;
    position: relative;
}

.seminar-info::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, #8B4513 50%, transparent 100%);
}

.seminar-info h2 {
    font-size: 24px;
    color: #8B4513;
    margin-bottom: 20px;
    font-weight: 400;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.seminar-date {
    font-size: 18px;
    color: #8B4513;
    margin-bottom: 15px;
    text-decoration: underline;
    font-weight: 500;
}

.seminar-description {
    font-size: 16px;
    color: #8B4513;
    font-weight: 500;
    letter-spacing: 1px;
}

/* Photo Grid Section */
.photo-grid-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8f6f0 0%, #f2ede5 100%);
    position: relative;
}

.photo-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 60px;
}

.photo-item {
    aspect-ratio: 1;
    overflow: hidden;
    position: relative;
    background-color: #e8ddd4;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(139, 69, 19, 0.1);
}

.photo-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(139, 69, 19, 0.2);
}

.photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: sepia(8%) saturate(95%) brightness(98%) contrast(102%);
    transition: all 0.3s ease;
}

.photo-item:hover img {
    filter: sepia(0%) saturate(100%) brightness(105%) contrast(105%);
    transform: scale(1.05);
}

.overlay {
    position: absolute;
    bottom: 20px;
    left: 20px;
    background-color: #d4526e;
    color: white;
    padding: 10px 18px;
    font-weight: bold;
    font-size: 14px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
}

.overlay-text {
    font-size: 12px;
    letter-spacing: 1px;
}

.grid-text {
    text-align: right;
    padding-right: 20px;
    margin-top: 20px;
}

.grid-text p {
    font-size: 16px;
    color: #8B4513;
    font-weight: 500;
    font-style: italic;
}

/* Nature Gallery Section */
.nature-gallery-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #ffffff 0%, #fafafa 100%);
    position: relative;
}

.nature-gallery-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, #8B4513 50%, transparent 100%);
}

.nature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.nature-item {
    aspect-ratio: 1;
    overflow: hidden;
    position: relative;
    background-color: #e8ddd4;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(139, 69, 19, 0.1);
}

.nature-item:hover {
    transform: scale(1.02);
    box-shadow: 0 10px 25px rgba(139, 69, 19, 0.15);
}

.nature-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: sepia(15%) saturate(85%) brightness(95%) contrast(102%);
    transition: all 0.3s ease;
}

.nature-item:hover img {
    filter: sepia(8%) saturate(100%) brightness(100%) contrast(105%);
}

.dark-overlay {
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.7));
}

.dark-overlay img {
    filter: sepia(15%) saturate(85%) brightness(75%) contrast(110%);
}

.dark-overlay .overlay-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    text-align: center;
    padding: 25px;
}

.dark-overlay .overlay-text p {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 8px;
    line-height: 1.4;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.dark-overlay .overlay-text .small-text {
    font-size: 12px;
    font-weight: 300;
    opacity: 0.95;
    margin-top: 15px;
    line-height: 1.4;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.7);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-content {
        margin-left: 0;
        max-width: none;
        padding: 40px 20px;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .photo-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    
    .nature-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }
    
    .grid-text {
        text-align: center;
        padding: 0;
    }
    
    .dark-overlay .overlay-text {
        padding: 15px;
    }
    
    .dark-overlay .overlay-text p {
        font-size: 14px;
    }
    
    .dark-overlay .overlay-text .small-text {
        font-size: 11px;
    }
}

@media (max-width: 480px) {
    .hero-image {
        padding: 20px 10px;
    }
    
    .photo-grid {
        grid-template-columns: 1fr;
    }
    
    .nature-grid {
        grid-template-columns: 1fr;
    }
    
    .seminar-info h2 {
        font-size: 18px;
    }
    
    .logo {
        font-size: 16px;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Loading Animation */
.photo-item img,
.nature-item img {
    transition: all 0.3s ease;
}

.photo-item:hover img,
.nature-item:hover img {
    transform: scale(1.05);
    filter: sepia(5%) saturate(100%) brightness(100%);
}