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

:root {
    --primary: #7C3AED;
    --primary-dark: #6D28D9;
    --primary-light: #A78BFA;
    --bg-dark: #1A1A2E;
    --bg-light: #FFFFFF;
    --text-dark: #1F2937;
    --text-light: #6B7280;
    --text-white: #FFFFFF;
    --gradient-purple: linear-gradient(135deg, #7C3AED 0%, #9333EA 100%);
    --gradient-hero: linear-gradient(180deg, #7C3AED 0%, #5B21B6 100%);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Language Nav */
.lang-nav {
    background: var(--primary-dark);
    padding: 12px 0;
}

.lang-nav .container {
    display: flex;
    justify-content: flex-end;
    gap: 16px;
}

.lang-nav a {
    color: var(--text-white);
    text-decoration: none;
    font-size: 14px;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.lang-nav a:hover,
.lang-nav a.active {
    opacity: 1;
}

.lang-nav a.active {
    font-weight: 600;
}

/* Hero Section */
.hero {
    background: var(--gradient-hero);
    color: var(--text-white);
    padding: 80px 0 100px;
    text-align: center;
}

.hero-content {
    max-width: 600px;
    margin: 0 auto;
}

.app-icon {
    width: 100px;
    height: 100px;
    background: var(--text-white);
    color: var(--primary);
    font-size: 48px;
    font-weight: 700;
    border-radius: 22px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 12px;
}

.tagline {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 8px;
    opacity: 0.95;
}

.subtitle {
    font-size: 18px;
    opacity: 0.85;
    margin-bottom: 40px;
}

.store-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.store-btn {
    display: inline-flex;
    align-items: center;
    padding: 14px 28px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.store-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.app-store {
    background: #000;
    color: #fff;
}

.play-store {
    background: #fff;
    color: var(--text-dark);
}

/* Features Section */
.features {
    padding: 100px 0;
}

.features h2 {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 60px;
    color: var(--text-dark);
}

.feature-grid {
    display: flex;
    flex-direction: column;
    gap: 80px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 60px;
}

.feature-item.reverse {
    flex-direction: row-reverse;
}

.feature-image {
    flex: 0 0 300px;
}

.feature-image img {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.feature-text {
    flex: 1;
}

.feature-text h3 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.feature-text p {
    font-size: 18px;
    color: var(--text-light);
    line-height: 1.8;
}

/* Support Section */
.support {
    padding: 100px 0;
    background: #F9FAFB;
}

.support h2 {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 60px;
}

.support-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.support-item h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.support-item p {
    color: var(--text-light);
    margin-bottom: 20px;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    background: var(--gradient-purple);
    color: var(--text-white);
    text-decoration: none;
    border-radius: 10px;
    font-weight: 500;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(124, 58, 237, 0.3);
}

/* FAQ */
.faq {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq details {
    background: var(--bg-light);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.faq summary {
    font-weight: 500;
    cursor: pointer;
    color: var(--text-dark);
    list-style: none;
}

.faq summary::-webkit-details-marker {
    display: none;
}

.faq summary::before {
    content: '+';
    display: inline-block;
    width: 24px;
    font-weight: 600;
    color: var(--primary);
}

.faq details[open] summary::before {
    content: '−';
}

.faq details p {
    margin-top: 12px;
    padding-left: 24px;
    color: var(--text-light);
}

/* Privacy Section */
.privacy {
    padding: 100px 0;
}

.privacy h2 {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 60px;
}

.privacy-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.privacy-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin-top: 32px;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.privacy-content h3:first-child {
    margin-top: 0;
}

.privacy-content p {
    color: var(--text-light);
    margin-bottom: 16px;
}

.privacy-content a {
    color: var(--primary);
    text-decoration: none;
}

.privacy-content a:hover {
    text-decoration: underline;
}

.update-date {
    margin-top: 40px;
    font-size: 14px;
    color: var(--text-light);
    opacity: 0.8;
}

.privacy-summary {
    font-size: 18px;
    color: var(--text-light);
    margin-bottom: 24px;
    line-height: 1.8;
    text-align: center;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.privacy-summary strong {
    color: var(--text-dark);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

/* Footer */
footer {
    background: var(--bg-dark);
    color: var(--text-white);
    padding: 60px 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
}

.app-icon-small {
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.footer-nav {
    display: flex;
    gap: 32px;
}

.footer-nav a {
    color: var(--text-white);
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.footer-nav a:hover {
    opacity: 1;
}

.copyright {
    font-size: 14px;
    opacity: 0.6;
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        padding: 60px 0 80px;
    }

    .hero h1 {
        font-size: 36px;
    }

    .tagline {
        font-size: 20px;
    }

    .subtitle {
        font-size: 16px;
    }

    .store-buttons {
        flex-direction: column;
        align-items: center;
    }

    .store-btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .features {
        padding: 60px 0;
    }

    .features h2 {
        font-size: 28px;
        margin-bottom: 40px;
    }

    .feature-grid {
        gap: 60px;
    }

    .feature-item,
    .feature-item.reverse {
        flex-direction: column;
        text-align: center;
    }

    .feature-image {
        flex: none;
    }

    .feature-image img {
        max-width: 250px;
    }

    .feature-text h3 {
        font-size: 24px;
    }

    .feature-text p {
        font-size: 16px;
    }

    .support {
        padding: 60px 0;
    }

    .support h2 {
        font-size: 28px;
        margin-bottom: 40px;
    }

    .support-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .privacy {
        padding: 60px 0;
    }

    .privacy h2 {
        font-size: 28px;
        margin-bottom: 40px;
    }

    .footer-nav {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }
}