/* ===== CSS Variables ===== */
:root {
    /* Colors */
    --color-bg: #0a0a0b;
    --color-bg-secondary: #111113;
    --color-bg-tertiary: #18181b;
    --color-surface: #1c1c1f;
    --color-border: #27272a;
    --color-border-light: #3f3f46;

    --color-text-primary: #fafafa;
    --color-text-secondary: #a1a1aa;
    --color-text-tertiary: #71717a;

    --color-primary: #6366f1;
    --color-primary-hover: #818cf8;
    --color-primary-light: rgba(99, 102, 241, 0.1);

    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
    --gradient-text: linear-gradient(135deg, #818cf8 0%, #c084fc 50%, #f472b6 100%);
    --gradient-glow: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.15) 0%, transparent 70%);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    --font-size-6xl: 4.5rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-md) 0;
    background: transparent;
    backdrop-filter: none;
    border-bottom: 1px solid transparent;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(10, 10, 11, 0.8);
    backdrop-filter: blur(12px);
    border-bottom-color: var(--color-border);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
}

.nav-logo img {
    height: 32px;
    width: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text-primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: 1px;
    transition: all var(--transition-base);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 65px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    padding: var(--spacing-xl);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.mobile-link {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.35);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-border-light);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    border-radius: var(--radius-xl);
}

.btn-block {
    width: 100%;
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(80px + var(--spacing-4xl)) 0 var(--spacing-4xl);
    overflow: hidden;
}

/* Hero Fullscreen Video */
.hero-fullscreen {
    padding: 0;
    min-height: 100vh;
}

.hero-video-fullscreen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.hero-video-fullscreen iframe {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 177.78vh; /* 16:9 aspect ratio based on height */
    height: 100vh;
    min-width: 100vw;
    min-height: 56.25vw; /* 16:9 aspect ratio based on width */
    transform: translate(-50%, -50%);
    border: none;
    pointer-events: none;
}

.hero-video-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to bottom,
        rgba(10, 10, 11, 0.3) 0%,
        rgba(10, 10, 11, 0.1) 50%,
        rgba(10, 10, 11, 0.5) 100%
    );
    pointer-events: none;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 150%;
    height: 100%;
    background: var(--gradient-glow);
    opacity: 0.6;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-primary-light);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary-hover);
    margin-bottom: var(--spacing-xl);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-xl);
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-2xl);
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-3xl);
    flex-wrap: wrap;
}


/* ===== Sections ===== */
.section {
    padding: var(--spacing-4xl) 0;
}

.section-dark {
    background: var(--color-bg-secondary);
}

.section-header {
    max-width: 700px;
    margin: 0 auto var(--spacing-3xl);
    text-align: center;
}

.section-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-primary-light);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary-hover);
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-lg);
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ===== Values Grid ===== */
.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.value-card {
    padding: var(--spacing-2xl);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    transition: all var(--transition-base);
}

.value-card:hover {
    border-color: var(--color-border-light);
    transform: translateY(-4px);
}

.value-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-light);
    border-radius: var(--radius-lg);
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.value-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.value-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===== Process Grid ===== */
.process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.process-card {
    padding: var(--spacing-2xl);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    transition: all var(--transition-base);
}

.process-card:hover {
    border-color: var(--color-primary);
    background: var(--color-bg-tertiary);
}

.process-number {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-lg);
}

.process-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.process-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===== Products Slider ===== */
.products-slider {
    width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding-bottom: var(--spacing-md);
}

.products-slider::-webkit-scrollbar {
    display: none;
}

.products-track {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-xs);
}

.product-card {
    position: relative;
    flex: 0 0 280px;
    padding: var(--spacing-xl);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

.product-card:hover {
    border-color: var(--color-border-light);
    transform: translateY(-2px);
}

.product-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: white;
}

.product-badge-soon {
    background: var(--color-surface);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.product-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-light);
    border-radius: var(--radius-lg);
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.product-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.product-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-xs);
}

/* ===== CTA Section ===== */
.cta-section {
    background: var(--color-bg);
    text-align: center;
}

.cta-simple {
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

.cta-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.cta-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-primary-hover);
    transition: all var(--transition-fast);
}

.cta-link:hover {
    color: var(--color-text-primary);
    gap: var(--spacing-md);
}

.cta-link svg {
    transition: transform var(--transition-fast);
}

.cta-link:hover svg {
    transform: translateX(4px);
}

/* ===== Footer ===== */
.footer {
    padding: var(--spacing-4xl) 0 var(--spacing-2xl);
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
}

.footer-logo img {
    height: 32px;
    margin-bottom: var(--spacing-lg);
}

.footer-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.footer-location {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.footer-links-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
}

.footer-links-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-link {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-text-primary);
}

.footer-bottom {
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

.footer-copyright {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .section-title {
        font-size: var(--font-size-3xl);
    }

    .values-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .process-grid {
        grid-template-columns: repeat(2, 1fr);
    }


    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
    }

    .nav-links,
    .nav-actions {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .mobile-menu {
        display: block;
    }

    .hero {
        padding-top: calc(60px + var(--spacing-3xl));
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .hero-description {
        font-size: var(--font-size-base);
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .hero-video {
        margin-top: var(--spacing-xl);
    }

    .hero-video-wrapper {
        border-radius: var(--radius-lg);
    }

    /* 모바일 전체화면 비디오 - 세로 화면 대응 */
    .hero-video-fullscreen iframe {
        width: 300vw;
        height: 100vh;
        min-width: 300vw;
        min-height: 100vh;
    }

    .section {
        padding: var(--spacing-3xl) 0;
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }

    .values-grid,
    .process-grid {
        grid-template-columns: 1fr;
    }

    .cta-title {
        font-size: var(--font-size-2xl);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .footer-links {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .footer-links {
        grid-template-columns: 1fr;
    }
}