/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --color-primary: #2c2c2c;
    --color-secondary: #666666;
    --color-text: #333333;
    --color-text-light: #777777;
    --color-text-lighter: #999999;
    --color-background: #ffffff;
    --color-background-alt: #fafafa;
    --color-border: #e5e5e5;
    --color-border-light: #f0f0f0;
    --color-accent: #4a4a4a;
    
    /* Typography */
    --font-primary: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-secondary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Font Sizes */
    --fs-xs: 0.75rem;
    --fs-sm: 0.875rem;
    --fs-base: 1rem;
    --fs-lg: 1.125rem;
    --fs-xl: 1.25rem;
    --fs-2xl: 1.5rem;
    --fs-3xl: 1.875rem;
    --fs-4xl: 2.25rem;
    --fs-5xl: 3rem;
    --fs-6xl: 3.75rem;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    --space-5xl: 8rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --header-height: 80px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--fs-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-light);
    z-index: 1000;
    transition: background-color var(--transition-normal);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.nav-brand .logo {
    font-family: var(--font-secondary);
    font-size: var(--fs-xl);
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: var(--space-xl);
}

.nav-link {
    font-size: var(--fs-sm);
    font-weight: 400;
    color: var(--color-text-light);
    text-decoration: none;
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-primary);
    transition: width var(--transition-fast);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background-color: var(--color-primary);
    transition: all var(--transition-fast);
}

/* Main Content */
.main {
    margin-top: var(--header-height);
}

/* Hero Section */
.hero {
    min-height: calc(100vh - var(--header-height));
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, #fafafa 0%, #ffffff 100%);
}

.hero-content {
    max-width: 800px;
}

.hero-title {
    font-size: clamp(var(--fs-4xl), 8vw, var(--fs-6xl));
    font-weight: 300;
    line-height: 1.2;
    color: var(--color-primary);
    margin-bottom: var(--space-xl);
}

.title-line {
    display: block;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease forwards;
}

.title-line:nth-child(2) {
    animation-delay: 0.2s;
}

.hero-subtitle {
    font-size: var(--fs-lg);
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.4s;
}

.subtitle-ko {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 400;
}

.subtitle-en {
    display: block;
    font-family: var(--font-secondary);
    font-size: var(--fs-base);
    color: var(--color-text-lighter);
    font-style: italic;
}

/* Section Base */
.section {
    padding: var(--space-5xl) 0;
}

.section:nth-child(even) {
    background-color: var(--color-background-alt);
}

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

.section-title {
    font-size: var(--fs-3xl);
    font-weight: 300;
    color: var(--color-primary);
    margin-bottom: var(--space-3xl);
    position: relative;
}

.section-title::after {
    content: '';
    width: 40px;
    height: 1px;
    background-color: var(--color-border);
    position: absolute;
    bottom: -var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
}

/* Mission Section */
.mission-text {
    max-width: 500px;
    margin: 0 auto;
}

.mission-statement {
    font-size: var(--fs-2xl);
    line-height: 1.5;
    color: var(--color-text);
    font-weight: 300;
}

.highlight {
    color: var(--color-primary);
    font-weight: 400;
}

/* Philosophy Section */
.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-3xl);
    margin-top: var(--space-4xl);
}

.philosophy-item {
    text-align: center;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.6s ease forwards;
}

.philosophy-item:nth-child(1) { animation-delay: 0.1s; }
.philosophy-item:nth-child(2) { animation-delay: 0.2s; }
.philosophy-item:nth-child(3) { animation-delay: 0.3s; }

.philosophy-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    color: var(--color-secondary);
    transition: all var(--transition-normal);
}

.philosophy-item:hover .philosophy-icon {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.philosophy-item h3 {
    font-size: var(--fs-lg);
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

.philosophy-item p {
    color: var(--color-text-light);
    line-height: 1.6;
}

/* Services Section */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-2xl);
    margin-top: var(--space-4xl);
}

.service-card {
    background-color: var(--color-background);
    border: 1px solid var(--color-border-light);
    border-radius: 8px;
    padding: var(--space-2xl);
    text-align: left;
    transition: all var(--transition-normal);
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.6s ease forwards;
}

.service-card:nth-child(1) { animation-delay: 0.1s; }
.service-card:nth-child(2) { animation-delay: 0.2s; }

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.service-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
}

.service-card h3 {
    font-size: var(--fs-xl);
    font-weight: 500;
    color: var(--color-primary);
    font-family: var(--font-secondary);
}

.service-status {
    font-size: var(--fs-xs);
    color: var(--color-text-lighter);
    background-color: var(--color-background-alt);
    padding: var(--space-xs) var(--space-sm);
    border-radius: 12px;
}

.service-description {
    color: var(--color-text-light);
    margin-bottom: var(--space-xl);
    line-height: 1.6;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--fs-sm);
    transition: color var(--transition-fast);
}

.service-link:hover {
    color: var(--color-accent);
}

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

.service-link:hover svg {
    transform: translate(2px, -2px);
}

/* Contact Section */
.contact-content {
    text-align: center;
}

.contact-message {
    font-size: var(--fs-lg);
    color: var(--color-text-light);
    margin-bottom: var(--space-2xl);
    line-height: 1.6;
}

.contact-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.contact-link {
    font-size: var(--fs-lg);
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.contact-link:hover {
    color: var(--color-accent);
}

.contact-divider {
    color: var(--color-border);
    font-weight: 300;
}

/* Footer */
.footer {
    background-color: var(--color-primary);
    color: var(--color-background);
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
}

.footer-brand .logo {
    font-family: var(--font-secondary);
    font-size: var(--fs-xl);
    font-weight: 600;
    color: var(--color-background);
}

.footer-tagline {
    font-size: var(--fs-sm);
    color: rgba(255, 255, 255, 0.7);
    margin-top: var(--space-xs);
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: var(--fs-sm);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: var(--fs-sm);
    color: rgba(255, 255, 255, 0.6);
}

/* Animations */
@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease forwards;
}

.fade-in-delay {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.4s;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --fs-6xl: 2.5rem;
        --fs-5xl: 2rem;
        --fs-4xl: 1.75rem;
        --fs-3xl: 1.5rem;
        --space-5xl: 4rem;
        --space-4xl: 3rem;
        --space-3xl: 2rem;
    }
    
    .container {
        padding: 0 var(--space-md);
    }
    
    .nav {
        padding: 0 var(--space-md);
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-background);
        border-top: 1px solid var(--color-border-light);
        flex-direction: column;
        padding: var(--space-lg);
        gap: var(--space-lg);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero-title {
        font-size: var(--fs-4xl);
    }
    
    .philosophy-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--space-lg);
        text-align: center;
    }
    
    .contact-links {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .contact-divider {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-subtitle {
        font-size: var(--fs-base);
    }
    
    .mission-statement {
        font-size: var(--fs-xl);
    }
    
    .service-card {
        padding: var(--space-lg);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Focus styles for better accessibility */
.nav-link:focus,
.service-link:focus,
.contact-link:focus,
.footer-links a:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #000000;
        --color-secondary: #333333;
        --color-text: #000000;
        --color-background: #ffffff;
        --color-border: #666666;
    }
}