/* CSS Custom Properties for easier theming */
:root {
    --bg-color: #f0f4f8; /* Light Grayish Blue */
    --primary-color: #3b82f6; /* Vibrant Blue */
    --primary-color-dark: #2563eb;
    --text-color: #1e293b; /* Dark Slate */
    --text-color-light: #475569; /* Cool Gray */
    --card-bg-color: rgba(255, 255, 255, 0.8);
    --border-color: rgba(59, 130, 246, 0.2);
    --shadow-color: rgba(59, 130, 246, 0.25);
    --glow-color: rgba(59, 130, 246, 0.5);
    --font-family: 'IBM Plex Sans KR', sans-serif;
}

body {
    font-family: var(--font-family);
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    overflow-x: hidden; 
}

.hero-section {
    background: linear-gradient(135deg, #ffffff 0%, #e0e7ff 100%);
    text-align: center;
    padding: 6rem 2rem;
    position: relative;
    border-bottom: 1px solid var(--border-color);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 4rem; /* 64px */
    font-weight: 700;
    color: var(--primary-color-dark);
    margin: 0;
    letter-spacing: -1px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.hero-subtitle {
    font-size: 1.5rem; /* 24px */
    font-weight: 500;
    color: var(--text-color);
    margin: 1rem 0 1.5rem 0;
}

.hero-description {
    font-size: 1.125rem; /* 18px */
    font-weight: 400;
    color: var(--text-color-light);
    line-height: 1.8;
}

main {
    padding: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        padding: 4rem 1.5rem;
    }
    .hero-title {
        font-size: 3rem;
    }
    .hero-subtitle {
        font-size: 1.25rem;
    }
    main {
        padding: 1rem;
    }
}