:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #f8fafc;
    --text-color: #1e293b;
    --text-light: #64748b;
    --bg-color: #f1f5f9;
    --white: #ffffff;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --radius: 0.5rem;
}

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

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

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

ul {
    list-style: none;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Navbar */
.navbar {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4rem;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-light);
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    transition: background-color 0.3s;
}

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

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

/* Section Common */
.section {
    padding: 4rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.section-header p {
    color: var(--text-light);
}

/* Calculator Card */
.calculator-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-group label i {
    color: var(--primary-color);
    margin-right: 0.5rem;
}

.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #cbd5e1;
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-color);
    background-color: var(--white);
}

.result-box {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: var(--secondary-color);
    border-radius: var(--radius);
    text-align: center;
    border: 1px solid #e2e8f0;
}

.result-box h3 {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.score-display {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.score-message {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-light);
}

/* Guide Section */
.guide-section {
    background-color: var(--white);
}

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

.card {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: var(--radius);
    text-align: center;
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-5px);
}

.icon-box {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin: 0 auto 1.5rem;
}

.card h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Footer */
.footer {
    background-color: var(--text-color);
    color: var(--white);
    text-align: center;
    padding: 2rem 0;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    .navbar .container {
        flex-direction: column;
        height: auto;
        padding: 1rem;
    }
    .nav-links {
        margin-top: 1rem;
        gap: 1rem;
    }
}