:root {
    --primary-color: #333;
    --accent-color: #0070f3;
    --bg-color: #f9f9f9;
    --card-bg: #ffffff;
    --text-color: #222;
    --text-muted: #666;
    --border-color: #eee;
    --container-width: 1100px;
    --transition: all 0.3s ease;
}

/* Dark Mode Colors */
body.dark-mode {
    --primary-color: #f5f5f5;
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --text-muted: #aaa;
    --border-color: #333;
}

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

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
#header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

#header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 5px 10px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    border-color: var(--accent-color);
}

.logo a {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -1px;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--transition);
}

.nav-links a.active, .nav-links a:hover {
    color: var(--accent-color);
}

.search-box input {
    padding: 8px 15px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    outline: none;
    font-size: 0.9rem;
}

/* Hero Section */
#hero {
    padding: 60px 0;
    text-align: center;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-family: 'Montserrat', sans-serif;
}

.hero-content p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* Post Grid */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.post-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.post-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.post-image {
    width: 100%;
    height: 200px;
    background-color: #ddd;
    background-size: cover;
    background-position: center;
}

.post-content {
    padding: 20px;
}

.post-category {
    font-size: 0.8rem;
    color: var(--accent-color);
    font-weight: 700;
    margin-bottom: 10px;
    display: block;
    text-transform: uppercase;
}

.post-title {
    font-size: 1.25rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.post-excerpt {
    color: var(--text-muted);
    font-size: 0.95rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-meta {
    margin-top: 15px;
    font-size: 0.85rem;
    color: #999;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.7);
    overflow-y: auto;
}

.modal-content {
    background-color: #fff;
    margin: 5% auto;
    padding: 40px;
    width: 90%;
    max-width: 800px;
    border-radius: 15px;
    position: relative;
}

.close-btn {
    position: absolute;
    right: 25px;
    top: 20px;
    font-size: 2rem;
    cursor: pointer;
    color: #999;
}

/* Footer */
#footer {
    padding: 40px 0;
    background: #fff;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.social-links {
    margin-top: 15px;
}

.social-links a {
    margin: 0 10px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    #header .container {
        flex-direction: column;
        gap: 15px;
    }
    .hero-content h2 {
        font-size: 2rem;
    }
}

/* Inquiry Button & Modal */
#inquiry-btn {
    background-color: var(--accent-color);
    color: white !important;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    margin-left: 10px;
}

#inquiry-btn:hover {
    background-color: #0056b3;
}

.close-inquiry {
    position: absolute;
    right: 25px;
    top: 20px;
    font-size: 2rem;
    cursor: pointer;
    color: #999;
}