:root {
    --primary-color: #0F172A; /* Deep Navy Blue */
    --accent-color: #3B82F6; /* Bright Blue for accents */
    --text-color: #334155; /* Slate 700 */
    --light-text: #64748B; /* Slate 500 */
    --white: #F8FAFC;
    --bg-color: #FFFFFF;
    --bg-light: #F1F5F9;
    --font-heading: 'Noto Serif KR', serif;
    --font-body: 'Noto Sans KR', sans-serif;
    --container-width: 1200px;
    --section-padding: 100px 0;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --transition: all 0.3s ease;
}

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

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--primary-color);
    margin-bottom: 20px;
    font-weight: 700;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.text-center { text-align: center; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    font-family: var(--font-body);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

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

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

.section-padding {
    padding: var(--section-padding);
}

/* Header */
.header {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 20px 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 900;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav-list {
    display: flex;
    gap: 30px;
}

.nav-link {
    font-weight: 500;
    color: var(--text-color);
    font-size: 16px;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--accent-color);
    transition: var(--transition);
}

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

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

.mobile-menu-toggle {
    display: none;
    font-size: 24px;
    color: var(--primary-color);
    cursor: pointer;
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
    color: var(--white);
    text-align: center;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, transparent 0%, #000 100%);
    opacity: 0.6;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-title {
    font-size: 3.5rem; /* Larger font for desktop */
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--white);
    letter-spacing: -1px;
    font-weight: 800; /* Extra bold */
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 40px;
    color: #CBD5E1; /* Lighter slate */
    font-weight: 300;
}

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

/* Services Section */
.section-header {
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    position: relative;
    margin-bottom: 15px;
}

.section-description {
    font-size: 1.1rem;
    color: var(--light-text);
    max-width: 600px;
    margin: 0 auto;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background-color: var(--white);
    border: 1px solid #E2E8F0;
    padding: 40px;
    border-radius: var(--border-radius);
    text-align: left; /* Formal left-align */
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    border-color: var(--accent-color);
}

.icon-box {
    font-size: 40px;
    color: var(--accent-color);
    margin-bottom: 25px;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.service-card p {
    color: var(--light-text);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.service-list {
    border-top: 1px solid #E2E8F0;
    padding-top: 20px;
}

.service-list li {
    font-size: 0.9rem;
    color: var(--text-color);
    margin-bottom: 10px;
    padding-left: 20px;
    position: relative;
}

.service-list li::before {
    content: "•"; /* Simple bullet */
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* About Section */
.bg-light {
    background-color: var(--bg-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-text h3 {
    color: var(--accent-color);
    font-size: 1.2rem;
    margin-bottom: 30px;
    font-family: var(--font-body);
    font-weight: 600;
}

.about-text p {
    margin-bottom: 20px;
    color: var(--text-color);
    font-size: 1rem;
}

.about-stats {
    display: flex;
    gap: 40px;
    margin-top: 30px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    font-family: var(--font-heading);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--light-text);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.about-image {
    position: relative;
}

.image-placeholder {
    width: 100%;
    height: 400px;
    background-color: #CBD5E1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    font-size: 100px;
    color: #94A3B8;
}

/* Contact Section */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 50px;
    background-color: var(--white);
    padding: 50px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border: 1px solid #E2E8F0;
}

.contact-info .info-item {
    margin-bottom: 30px;
}

.info-item i {
    font-size: 24px;
    color: var(--accent-color);
    margin-bottom: 15px;
}

.info-item h4 {
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.info-item p {
    color: var(--light-text);
    font-size: 0.95rem;
}

.contact-form .form-group {
    margin-bottom: 20px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid #E2E8F0; /* Subtle border */
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.btn-block {
    width: 100%;
    text-align: center;
}

/* Footer */
.footer {
    background-color: var(--primary-color);
    color: #94A3B8;
    padding: 60px 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 40px;
    margin-bottom: 20px;
}

.footer-logo {
    font-family: var(--font-heading);
    font-size: 24px;
    color: var(--white);
    font-weight: 700;
}

.footer-links a {
    margin-left: 20px;
    font-size: 0.9rem;
}

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

.social-links a {
    margin-left: 20px;
    font-size: 1.2rem;
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    font-size: 0.8rem;
}

/* Animations */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }

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

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.reveal-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: all 0.8s ease;
}

.reveal-left.active {
    opacity: 1;
    transform: translateX(0);
}

.reveal-right {
    opacity: 0;
    transform: translateX(30px);
    transition: all 0.8s ease;
}

.reveal-right.active {
    opacity: 1;
    transform: translateX(0);
}

/* Responsive */
@media (max-width: 768px) {
    .header-container {
        padding: 0 20px;
    }
    
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--white);
        padding: 20px;
        box-shadow: 0 10px 15px rgba(0,0,0,0.1);
    }
    
    .nav.active {
        display: block;
    }
    
    .nav-list {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .about-content,
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .footer-links a,
    .social-links a {
        margin: 0 10px;
    }
}