:root {
    --background-color: #121212;
    --surface-color: #1E1E1E;
    --primary-text-color: #EAEAEA;
    --secondary-text-color: #B3B3B3;
    --accent-color-1: #03DAC6;
    --accent-color-2: #BB86FC;
    --card-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
    --card-hover-shadow: 0 6px 25px rgba(0, 0, 0, 0.6);
    --btn-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
    --btn-hover-shadow: 0 4px 12px rgba(0, 0, 0, 0.7);
}

body {
    background-color: var(--background-color);
    color: var(--primary-text-color);
    font-family: 'Montserrat', sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

a {
    color: var(--accent-color-1);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--accent-color-2);
}

header {
    background-color: var(--surface-color);
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #2a2a2a;
    position: sticky;
    top: 0;
    z-index: 1000;
}

header h1 a {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-text-color);
}

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

nav ul li {
    margin-left: 2rem;
}

nav ul li a {
    font-size: 1.1rem;
    font-weight: 500;
    padding-bottom: 5px;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s ease, color 0.3s ease;
}

nav ul li a.active, nav ul li a:hover {
    color: var(--accent-color-1);
    border-bottom-color: var(--accent-color-1);
}

main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

section {
    padding: 2rem 0;
}

section h2 {
    font-size: 2.5rem;
    color: var(--primary-text-color);
    margin-bottom: 1.5rem;
    border-left: 5px solid var(--accent-color-1);
    padding-left: 10px;
}

.home-section {
    margin-bottom: 3rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-header h3 {
    font-size: 1.8rem;
    color: var(--primary-text-color);
    border-left: 4px solid var(--accent-color-2);
    padding-left: 10px;
    margin: 0;
}

.btn {
    background-color: var(--accent-color-1);
    color: #121212;
    padding: 10px 20px;
    border-radius: 25px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: var(--btn-shadow);
    transition: background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.btn:hover {
    background-color: var(--accent-color-2);
    color: var(--surface-color);
    transform: translateY(-2px);
    box-shadow: var(--btn-hover-shadow);
}

.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.card {
    background-color: var(--surface-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-hover-shadow);
}

.card a {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card-image-container {
    width: 100%;
    height: 180px; /* 고정 높이 */
    overflow: hidden;
}

.card-image-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.card:hover .card-image-container img {
    transform: scale(1.05);
}

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

.card-content h3 {
    font-size: 1.3rem;
    margin-top: 0;
    color: var(--primary-text-color);
}

.card-content p {
    color: var(--secondary-text-color);
    font-size: 0.95rem;
    flex-grow: 1;
    margin-bottom: 1rem;
}

.card-tags {
    margin-bottom: 1rem;
}

.card-tags span {
    background-color: #333;
    color: var(--accent-color-1);
    padding: 4px 8px;
    border-radius: 5px;
    font-size: 0.8rem;
    margin-right: 5px;
}

.card-source {
    font-style: italic;
    font-size: 0.85rem;
    color: var(--accent-color-2);
    margin-top: auto; /* Push source to the bottom */
}

footer {
    text-align: center;
    padding: 2rem;
    margin-top: 2rem;
    background-color: var(--surface-color);
    border-top: 1px solid #2a2a2a;
    color: var(--secondary-text-color);
}

.no-content {
    color: var(--secondary-text-color);
    text-align: center;
    padding: 2rem;
    font-style: italic;
}

/* Responsive Design */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        text-align: center;
    }

    nav ul {
        margin-top: 1rem;
        flex-direction: column;
        align-items: center;
    }

    nav ul li {
        margin: 0.5rem 0;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .section-header a.view-all-link {
        margin-top: 0.75rem;
    }

    main {
        padding: 1.5rem;
    }

    section h2 {
        font-size: 2rem;
    }

    .card-container {
        grid-template-columns: 1fr;
    }
}