/* Pretendard Variable Font */
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable-dynamic-subset.min.css');

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

:root {
    --primary-color: #7b68ee;
    --secondary-color: #4a90e2;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
    --error-color: #ef4444;
    --success-color: #10b981;
}

body {
    font-family: 'Pretendard Variable', 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

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

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 40px 0;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header .subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 20px;
}

header nav {
    margin-top: 20px;
}

header nav a {
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 6px;
    transition: all 0.3s;
}

header nav a:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: white;
}

/* Projects Grid */
#projects-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 60px;
}

.project-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.project-thumbnail {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.project-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.project-content {
    padding: 20px;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
}

.project-description {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.5;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
    grid-column: 1 / -1;
}

.empty-state h2 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

/* Loading */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-light);
    grid-column: 1 / -1;
}

/* Footer */
footer {
    background: var(--text-color);
    color: white;
    text-align: center;
    padding: 30px 0;
    margin-top: 60px;
}

footer p {
    opacity: 0.8;
}

/* Buttons */
.btn-primary, .btn-secondary {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--secondary-color);
}

.btn-secondary {
    background: var(--border-color);
    color: var(--text-color);
}

.btn-secondary:hover {
    background: #d1d5db;
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    #projects-container {
        grid-template-columns: 1fr;
    }
}