:root {
    /* Colors */
    --color-bg: #FFFFFF;
    --color-text: #1A1A1A;
    --color-text-light: #666666;
    --color-accent: #2E5CFF;
    --color-accent-dark: #1E4FE0;
    --color-border: #E5E5E5;
    
    /* Typography */
    --font-serif: 'Noto Serif KR', 'Spectral', serif;
    --font-sans: 'Noto Serif KR', 'Spectral', serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --spacing-2xl: 8rem;
    
    /* Layout */
    --max-width: 1200px;
    --max-width-text: 800px;
    
    /* Transitions */
    --transition-fast: 0.2s ease-out;
    --transition-base: 0.3s ease-out;
    --transition-slow: 0.6s ease-out;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 18px;
    line-height: 1.8;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    padding-top: 80px; /* 헤더 겹침 방지 */
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 700;
    line-height: 1.2;
}

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

.header.scrolled {
    border-bottom-color: var(--color-border);
}

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

.logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: 0.05em;
    transition: color var(--transition-base);
}

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

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-link {
    font-size: 1rem;
    color: var(--color-text);
    text-decoration: none;
    position: relative;
    transition: color var(--transition-base);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-base);
}

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

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

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-base);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-2xl) var(--spacing-md);
    position: relative;
    margin-top: -80px; /* body padding-top 상쇄 */
}

.hero-content {
    text-align: center;
    max-width: 900px;
}

.hero-title {
    margin-bottom: var(--spacing-lg);
}

.hero-title-ko {
    display: block;
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.hero-title-en {
    display: block;
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 400;
    color: var(--color-text-light);
    font-style: italic;
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.25rem);
    line-height: 2;
    color: var(--color-text-light);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
    cursor: pointer;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-left: 2px solid var(--color-text);
    border-bottom: 2px solid var(--color-text);
    transform: rotate(-45deg);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(10px);
    }
    60% {
        transform: translateX(-50%) translateY(5px);
    }
}

/* Business Preview Section */
.business-preview {
    padding: var(--spacing-2xl) var(--spacing-md);
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    font-weight: 600;
}

.business-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

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

.business-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(46, 92, 255, 0.03) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.business-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
    border-color: var(--color-accent);
}

.business-card:hover::before {
    opacity: 1;
}

.card-header {
    margin-bottom: var(--spacing-md);
}

.card-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    letter-spacing: 0.05em;
}

.card-subtitle {
    font-size: 1rem;
    color: var(--color-text-light);
    font-weight: 400;
}

.card-body {
    margin-bottom: var(--spacing-md);
}

.card-hanja {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    font-weight: 600;
}

.card-description {
    color: var(--color-text-light);
    line-height: 1.8;
}

.coming-soon {
    display: inline-block;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-text);
    color: var(--color-bg);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-base);
    position: relative;
}

.card-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-base);
}

.card-link:hover::after {
    width: calc(100% - 24px);
}

.card-link .arrow {
    transition: transform var(--transition-base);
}

.card-link:hover .arrow {
    transform: translateX(4px);
}

/* Footer */
.footer {
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.875rem;
    border-top: 1px solid var(--color-border);
}

/* Animations */
.fade-in {
    opacity: 0;
    animation: fadeIn var(--transition-slow) ease-out forwards;
}

.delay-1 {
    animation-delay: 0.3s;
}

.delay-2 {
    animation-delay: 0.6s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.fade-in-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-left {
    transform: translateX(-30px);
    transition-delay: 0.2s;
}

.slide-left.visible {
    transform: translateX(0);
}

.slide-right {
    transform: translateX(30px);
    transition-delay: 0.4s;
}

.slide-right.visible {
    transform: translateX(0);
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
        --spacing-2xl: 4rem;
    }
    
    body {
        padding-top: 70px; /* 모바일에서 헤더 높이 조정 */
    }
    
    .header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 400px;
        height: 100vh;
        background-color: var(--color-bg);
        flex-direction: column;
        padding: var(--spacing-2xl) var(--spacing-md);
        gap: var(--spacing-md);
        box-shadow: -4px 0 12px rgba(0, 0, 0, 0.1);
        transition: right var(--transition-base);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }
    
    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    .business-cards {
        grid-template-columns: 1fr;
    }
    
    .hero {
        padding: var(--spacing-xl) var(--spacing-md);
        margin-top: -70px; /* body padding-top 상쇄 */
    }
}

@media (max-width: 480px) {
    body {
        font-size: 16px;
        padding-top: 65px;
    }
    
    .hero-title-ko {
        font-size: 2.5rem;
    }
    
    .hero-title-en {
        font-size: 1.75rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .hero {
        margin-top: -65px;
    }
}