:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --accent-color: #ffc107;
    --bg-color: #f8f9fa;
    --text-color: #333;
    --white: #ffffff;
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

header {
    background-color: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 2rem;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: var(--primary-color);
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.hero {
    text-align: center;
    padding: 4rem 0;
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    color: var(--white);
    border-radius: 1rem;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.coupon-section {
    background-color: var(--white);
    padding: 3rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    text-align: center;
    margin-bottom: 3rem;
}

.coupon-section h2 {
    margin-bottom: 2rem;
}

.coupon-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.coupon-card {
    background-color: #f1f8ff;
    border: 2px dashed var(--primary-color);
    padding: 2rem;
    border-radius: 0.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.coupon-code {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.coupon-card button {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 0.3rem;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s;
}

.coupon-card button:hover {
    background-color: #0056b3;
}

.info-text {
    font-size: 0.9rem;
    color: var(--secondary-color);
}

.content-rich {
    margin-bottom: 4rem;
}

.content-block {
    display: flex;
    align-items: center;
    gap: 3rem;
    margin-bottom: 4rem;
}

.content-block.reverse {
    flex-direction: row-reverse;
}

.content-block img {
    width: 50%;
    border-radius: 1rem;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.content-block h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.exclusive-analysis {
    background-color: var(--white);
    padding: 3rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.exclusive-analysis h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.analysis-table {
    overflow-x: auto;
    margin-bottom: 3rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

th, td {
    padding: 1rem;
    border: 1px solid #dee2e6;
    text-align: center;
}

th {
    background-color: #f1f8ff;
    color: var(--primary-color);
}

.calculator-container {
    background-color: #f8f9fa;
    padding: 2rem;
    border-radius: 0.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

.calculator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    max-width: 400px;
    margin: 0 auto;
}

.calculator input, .calculator select {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ced4da;
    border-radius: 0.3rem;
}

.calculator button {
    width: 100%;
    background-color: var(--accent-color);
    color: #000;
    border: none;
    padding: 1rem;
    border-radius: 0.3rem;
    cursor: pointer;
    font-weight: bold;
}

#calc-result, #convert-result {
    margin-top: 1rem;
    font-weight: bold;
    color: var(--primary-color);
}

.comparison-content {
    border-left: 4px solid var(--primary-color);
    padding-left: 1.5rem;
    margin-top: 2rem;
}

footer {
    background-color: #343a40;
    color: var(--white);
    text-align: center;
    padding: 3rem 2rem;
    margin-top: 4rem;
}

footer p {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

@media (max-width: 768px) {
    .content-block, .content-block.reverse {
        flex-direction: column;
    }
    .content-block img {
        width: 100%;
    }
    .hero h1 {
        font-size: 2rem;
    }
    nav {
        flex-direction: column;
        gap: 1rem;
    }
    nav ul li {
        margin: 0 1rem;
    }
}