/* General Styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    background-color: #f8f9fa; /* 아주 연한 회색 배경 */
    color: #333;
    margin: 0;
}

a {
    text-decoration: none;
    color: #333;
}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

/* Header */
.header {
    background-color: #ffffff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

.nav ul {
    display: flex;
    gap: 1.5rem;
}

.nav a {
    font-size: 1rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav a:hover {
    color: #007bff;
}

.nav a.active {
    color: #007bff;
    font-weight: bold;
}

/* Ad Slot Placeholder Styles */
.ad-slot {
    background-color: #f1f1f1;
    border: 2px dashed #ccc;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 2rem auto;
    font-size: 1rem;
    color: #666;
    max-width: 90%;
}

/* Main Content & News Grid */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

/* News Card Styles */
.news-card {
    background-color: #ffffff; /* 카드 하얀색 배경 */
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08); /* 부드러운 그림자 효과 */
    transition: transform 0.3s ease, box-shadow 0.3s ease; /* 애니메이션 효과 */
}

.news-card:hover {
    transform: translateY(-8px); /* 마우스 오버 시 위로 떠오르는 효과 */
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.news-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-title {
    font-size: 1.25rem; /* 가독성을 위해 폰트 크기 증가 */
    font-weight: bold;
    margin: 0 0 0.5rem 0;
}

.card-excerpt {
    font-size: 1rem; /* 가독성을 위해 폰트 크기 증가 */
    line-height: 1.7; /* 줄 간격 증가 */
    margin: 0 0 1rem 0;
    flex-grow: 1;
}

.card-label {
    background-color: #f1f1f1;
    color: #555;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    align-self: flex-start;
}

.loading {
    text-align: center;
    width: 100%;
    grid-column: 1 / -1;
    font-size: 1.2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav ul {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .news-grid {
        grid-template-columns: 1fr; /* 모바일에서는 1열로 표시 */
    }

    .main-content {
        padding: 1rem;
    }

    .card-title {
        font-size: 1.15rem;
    }

    .card-excerpt {
        font-size: 0.95rem;
    }
}