/* style.css */
:root {
    --primary-color: #4a90e2;
    --bg-color: #f4f7f6;
    --card-bg: #ffffff;
    --text-color: #333;
}

body {
    font-family: 'Pretendard', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
}

header {
    text-align: center;
    padding: 50px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); /* 반응형 핵심 */
    gap: 20px;
    padding: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.project-card {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.project-card:hover {
    transform: translateY(-10px);
}

.icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.btn {
    display: inline-block;
    margin-top: 15px;
    padding: 10px 25px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: bold;
}

/* 모바일 대응: 화면이 작아지면 여백 조정 */
@media (max-width: 600px) {
    .container {
        padding: 20px;
    }
}