/* 검정/회색/흰색 테마 - 랜딩 페이지 */

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

:root {
    --color-black: #000000;
    --color-dark-gray: #1a1a1a;
    --color-gray: #333333;
    --color-medium-gray: #666666;
    --color-light-gray: #999999;
    --color-very-light-gray: #e5e5e5;
    --color-white: #ffffff;
    --color-accent: #2d2d2d;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans KR', sans-serif;
    background: var(--color-black);
    color: var(--color-white);
    line-height: 1.6;
}

.landing-container {
    max-width: 1400px;
    margin: 0 auto;
}

/* Header */
.landing-header {
    padding: 30px 40px;
    background: var(--color-dark-gray);
    border-bottom: 1px solid var(--color-gray);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: -0.5px;
}

.header-nav {
    display: flex;
    gap: 20px;
}

.nav-link {
    color: var(--color-white);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    padding: 8px 20px;
    border: 2px solid var(--color-white);
    border-radius: 6px;
    transition: all 0.3s ease;
    margin-left: 10px;
}

.nav-link:hover {
    background: var(--color-white);
    color: var(--color-black);
}

.nav-link-primary {
    color: var(--color-black);
    background: var(--color-white);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    padding: 10px 24px;
    border: 2px solid var(--color-white);
    border-radius: 6px;
    transition: all 0.3s ease;
    margin-left: 10px;
}

.nav-link-primary:hover {
    background: var(--color-light-gray);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.2);
}

/* Hero Section */
.landing-main {
    padding: 0 40px;
}

.hero-section {
    text-align: center;
    padding: 120px 40px;
    background: linear-gradient(180deg, var(--color-black) 0%, var(--color-dark-gray) 100%);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 30px;
    color: var(--color-white);
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--color-light-gray);
    margin-bottom: 50px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.cta-button {
    display: inline-block;
    padding: 18px 60px;
    background: var(--color-white);
    color: var(--color-black);
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 600;
    border-radius: 8px;
    transition: all 0.3s ease;
    border: 2px solid var(--color-white);
}

.cta-button:hover {
    background: var(--color-black);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.1);
}

/* Features Section */
.features-section {
    padding: 100px 40px;
    background: var(--color-dark-gray);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-item {
    text-align: center;
    padding: 40px 30px;
    background: var(--color-gray);
    border-radius: 12px;
    border: 1px solid var(--color-medium-gray);
    transition: all 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
    border-color: var(--color-light-gray);
    background: var(--color-accent);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.feature-item h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--color-white);
    font-weight: 600;
}

.feature-item p {
    color: var(--color-light-gray);
    line-height: 1.7;
    font-size: 1rem;
}

/* Examples Section */
.examples-section {
    padding: 60px 40px;
    background: var(--color-gray);
}

.examples-content {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
}

.examples-content h2 {
    font-size: 2rem;
    margin-bottom: 15px;
    color: var(--color-white);
    font-weight: 700;
}

.examples-subtitle {
    font-size: 1rem;
    color: var(--color-light-gray);
    margin-bottom: 20px;
}

.video-gallery {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    margin-bottom: 20px;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

.video-item {
    background: var(--color-dark-gray);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--color-medium-gray);
    transition: all 0.3s ease;
}

.video-item:hover {
    transform: translateY(-5px);
    border-color: var(--color-light-gray);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.video-item video {
    width: 100%;
    aspect-ratio: 9 / 16;
    display: block;
    background: var(--color-black);
    object-fit: contain;
}

.video-caption {
    padding: 10px 15px;
    color: var(--color-very-light-gray);
    font-size: 0.85rem;
    font-weight: 500;
    background: var(--color-dark-gray);
}

.examples-note {
    margin-top: 15px;
    padding: 15px;
    background: var(--color-dark-gray);
    border: 1px solid var(--color-medium-gray);
    border-radius: 8px;
}

.examples-note p {
    color: var(--color-light-gray);
    font-size: 0.95rem;
    margin: 0;
}

/* About Section */
.about-section {
    padding: 100px 40px;
    background: var(--color-black);
}

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

.about-content h2 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: var(--color-white);
    font-weight: 700;
}

.about-content p {
    font-size: 1.15rem;
    color: var(--color-light-gray);
    margin-bottom: 20px;
    line-height: 1.9;
}

.tech-stack {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-top: 40px;
}

.tech-item {
    padding: 12px 24px;
    background: var(--color-gray);
    border: 1px solid var(--color-medium-gray);
    border-radius: 30px;
    font-size: 0.95rem;
    color: var(--color-very-light-gray);
    font-weight: 500;
}

/* CTA Section */
.cta-section {
    padding: 100px 40px;
    background: var(--color-dark-gray);
    text-align: center;
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--color-white);
    font-weight: 700;
}

.cta-section p {
    font-size: 1.2rem;
    color: var(--color-light-gray);
    margin-bottom: 40px;
}

.cta-button-secondary {
    display: inline-block;
    padding: 18px 60px;
    background: transparent;
    color: var(--color-white);
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 600;
    border-radius: 8px;
    border: 2px solid var(--color-white);
    transition: all 0.3s ease;
}

.cta-button-secondary:hover {
    background: var(--color-white);
    color: var(--color-black);
    transform: translateY(-2px);
}

/* Footer */
.landing-footer {
    padding: 50px 40px 30px;
    background: var(--color-black);
    border-top: 1px solid var(--color-gray);
    text-align: center;
}

.landing-footer p {
    color: var(--color-medium-gray);
    font-size: 0.95rem;
    margin-bottom: 10px;
}

.footer-company-info {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--color-gray);
}

.footer-company-info p {
    font-size: 0.85rem;
    color: var(--color-medium-gray);
    margin-bottom: 6px;
    line-height: 1.5;
}

.footer-company-info .company-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-light-gray);
    margin-bottom: 12px;
}

.footer-company-info a {
    color: var(--color-light-gray);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-company-info a:hover {
    color: var(--color-white);
    text-decoration: underline;
}

.footer-links {
    margin-bottom: 20px;
}

.footer-links a {
    color: var(--color-light-gray);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--color-white);
    text-decoration: underline;
}

.footer-divider {
    color: var(--color-gray);
    margin: 0 15px;
}

.footer-copyright {
    font-size: 0.9rem;
    color: var(--color-medium-gray);
    margin-bottom: 10px;
}

.footer-note {
    font-size: 0.85rem;
    color: var(--color-light-gray);
    max-width: 800px;
    margin: 20px auto 0;
    line-height: 1.6;
}

/* Responsive */
@media (max-width: 1024px) {
    .logo {
        font-size: 1.5rem;
    }
    
    .header-nav {
        gap: 15px;
    }
    
    .nav-link,
    .nav-link-primary {
        font-size: 0.9rem;
        padding: 7px 15px;
        margin-left: 5px;
    }
}

@media (max-width: 768px) {
    .landing-header {
        padding: 20px;
    }
    
    .header-content {
        flex-direction: column;
        gap: 20px;
        align-items: flex-start;
    }
    
    .logo {
        font-size: 1.3rem;
        word-break: keep-all;
        line-height: 1.3;
    }
    
    .header-nav {
        flex-wrap: wrap;
        gap: 10px;
        width: 100%;
    }
    
    .nav-link,
    .nav-link-primary {
        font-size: 0.85rem;
        padding: 6px 12px;
        margin-left: 0;
    }
    
    .landing-main {
        padding: 0 20px;
    }
    
    .hero-section {
        padding: 80px 20px;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .features-section,
    .examples-section,
    .about-section,
    .cta-section {
        padding: 60px 20px;
    }
    
    .about-content h2,
    .examples-content h2,
    .cta-section h2 {
        font-size: 2rem;
    }
    
    .video-gallery {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.1rem;
        max-width: 100%;
    }
    
    .header-nav {
        font-size: 0.8rem;
    }
    
    .nav-link,
    .nav-link-primary {
        font-size: 0.75rem;
        padding: 5px 10px;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .video-gallery {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .tech-stack {
        flex-direction: column;
        align-items: center;
    }
}