:root {
    --primary-color: #00a0c5;
    --secondary-color: #FF6F61;
    --background-color: #000000;
    --text-color: #E0E0E0;
    --surface-color: #1e1e1e;
    --border-color: rgba(255, 255, 255, 0.15);
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --dark-gray-color: #A0A0A0;
    --light-gray-color: #2a2a2a;
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.main-header {
    background: var(--background-color);
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
    margin-right: 12px;
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
    margin: 0;
}

.main-nav a {
    color: var(--dark-gray-color);
    text-decoration: none;
    font-size: 16px;
    margin-left: 25px;
    transition: color 0.3s ease;
}

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

.cta-button-small {
    background-color: var(--primary-color);
    color: white !important;
    padding: 8px 16px;
    border-radius: var(--border-radius);
    font-weight: 700;
    transition: background-color 0.3s ease;
}

.cta-button-small:hover {
    background-color: #007a9c;
}

/* Hero Section */
.hero {
    padding: 80px 0;
    text-align: center;
}

.hero-content {
    max-width: 700px;
    margin: 0 auto 40px;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--dark-gray-color);
    margin-bottom: 30px;
}

.cta-button {
    background-color: var(--primary-color);
    color: white;
    padding: 15px 30px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-size: 18px;
    font-weight: 700;
    display: inline-block;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(74, 144, 226, 0.4);
}

.hero-image img {
    max-width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* Insight Section */
.insight-section {
    padding: 80px 0;
    text-align: center;
    background-color: var(--surface-color);
}

.insight-section .section-title {
    font-size: 36px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 20px;
}

.insight-section .section-subtitle {
    font-size: 18px;
    color: var(--dark-gray-color);
    max-width: 700px;
    margin: 0 auto;
}


/* Features Section */
.features-section {
    background-color: var(--light-gray-color);
    padding: 80px 0;
}

.features-section .container {
    display: flex;
    justify-content: space-around;
    gap: 40px;
}

.feature {
    text-align: center;
    max-width: 400px;
}

.feature-icon img {
    height: 60px;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 15px;
}

.feature-description {
    font-size: 16px;
    color: var(--dark-gray-color);
}

/* How It Works Section */
.how-it-works-section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 60px;
}

.steps-container {
    display: flex;
    justify-content: space-between;
    gap: 40px;
}

.step {
    background: var(--background-color);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
    flex: 1;
    position: relative;
}

.step-number {
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #2c3e50;
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    border: 3px solid white;
}

.step-title {
    font-size: 20px;
    font-weight: 700;
    margin-top: 30px;
    margin-bottom: 15px;
}

.step-description {
    font-size: 16px;
    color: var(--dark-gray-color);
}

/* Download Section */
.download-section {
    background-color: var(--primary-color);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.download-section .section-title,
.download-section .section-subtitle {
    color: white;
}

.section-subtitle {
    font-size: 18px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.download-button {
    background-color: var(--surface-color);
    color: white;
    padding: 15px 25px;
    border-radius: var(--border-radius);
    text-decoration: none;
    display: flex;
    align-items: center;
    font-size: 18px;
    font-weight: 700;
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease;
}

.download-button:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.download-button img {
    height: 24px;
    margin-right: 12px;
}

/* Footer */
.main-footer {
    background-color: var(--light-gray-color);
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
}

.footer-links a {
    color: var(--dark-gray-color);
    text-decoration: none;
    font-size: 14px;
    margin-right: 20px;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    width: 100%;
    margin-top: 8px;
}

.last-updated, .copyright {
    font-size: 14px;
    color: var(--dark-gray-color);
    margin: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .main-header .container {
        flex-direction: column;
    }

    .main-nav {
        margin-top: 20px;
    }

    .hero-title {
        font-size: 36px;
    }

    .features-section .container,
    .steps-container {
        flex-direction: column;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        margin-bottom: 15px;
    }
}