:root {
    --bg-color: #f8f8f8;
    --text-color: #333;
    --header-bg: #fff;
    --header-text: #333;
    --nav-link: #555;
    --card-bg: #fff;
    --border-color: #ddd;
    --footer-bg: #333;
    --footer-text: #fff;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #f8f8f8;
    --header-bg: #2d2d2d;
    --header-text: #f8f8f8;
    --nav-link: #ccc;
    --card-bg: #2d2d2d;
    --border-color: #444;
}

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

body {
    font-family: 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

header {
    background-color: var(--header-bg);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-bottom 0.3s ease;
}

header h1 a {
    text-decoration: none;
    color: var(--header-text);
    font-size: 1.5rem;
    font-weight: bold;
}

header nav {
    display: flex;
    align-items: center;
}

header nav ul {
    list-style: none;
    display: flex;
}

header nav ul li {
    margin-left: 1.5rem;
}

header nav ul li a {
    text-decoration: none;
    color: var(--nav-link);
    font-weight: bold;
    transition: color 0.3s ease;
}

header nav ul li a:hover {
    color: #007bff;
}

#theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-radius: 5px;
    margin-left: 1.5rem;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

#theme-toggle:hover {
    background-color: #007bff;
    color: #fff;
    border-color: #007bff;
}

.hero {
    background-image: url('https://images.unsplash.com/photo-1555027583-09439b1a03a7?q=80&w=2070&auto=format&fit=crop&ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D');
    background-size: cover;
    background-position: center;
    height: 60vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: #fff;
}

.hero-content {
    background-color: rgba(0, 0, 0, 0.5);
    padding: 2rem;
    border-radius: 10px;
}

.hero h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-block;
    background-color: #007bff;
    color: #fff;
    padding: 0.8rem 1.5rem;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

.cta-button:hover {
    background-color: #0056b3;
}

section {
    padding: 4rem 2rem;
}

section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.category-item {
    background-color: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.category-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.15);
}

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

.category-item h3 {
    text-align: center;
    padding: 1rem;
}

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

footer {
    background-color: #333;
    color: #fff;
    padding: 2rem;
    text-align: center;
}

.social-links a {
    color: #fff;
    margin: 0 0.5rem;
    text-decoration: none;
}