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

:root {
    --primary-color: #0f172a;  /* Deep navy */
    --secondary-color: #0891b2; /* Ocean blue */
    --accent-color: #f59e0b;   /* Sunset gold */
    --text-dark: #1e293b;
    --text-light: #64748b;
    --bg-light: #f1f5f9;
    --white: #ffffff;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --ocean-gradient: linear-gradient(135deg, #0f172a 0%, #0891b2 50%, #06b6d4 100%);
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo h1 {
    font-size: 2rem;
    color: var(--primary-color);
    font-weight: 700;
}

.logo-sub {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-left: 0.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: url('https://images.unsplash.com/photo-1566073771259-6a8506099945?ixlib=rb-4.0.3&auto=format&fit=crop&w=2000&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--white);
    text-align: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.8) 0%, rgba(8, 145, 178, 0.6) 50%, rgba(6, 182, 212, 0.4) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 0 20px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: 2rem;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7);
}

.cta-button {
    background: var(--accent-color);
    color: var(--white);
    border: none;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 500;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.cta-button:hover {
    background: #dc2626;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(220, 38, 38, 0.3);
}

/* Section Styles */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

/* About Section */
.about {
    padding: 5rem 0;
    background: var(--bg-light);
}

.lead-text {
    font-size: 1.2rem;
    text-align: center;
    color: var(--text-light);
    margin-bottom: 3rem;
    line-height: 1.8;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.feature-card p {
    color: var(--text-light);
}

/* Services Section */
.services {
    padding: 5rem 0;
}

.service-list {
    display: grid;
    gap: 2rem;
}

.service-item {
    background: var(--white);
    padding: 2rem;
    border-left: 4px solid var(--accent-color);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.service-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(245, 158, 11, 0.1), transparent);
    transition: left 0.5s;
}

.service-item:hover::before {
    left: 100%;
}

.service-item:hover {
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.service-item h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.service-item p {
    color: var(--text-light);
    line-height: 1.7;
}

/* Vision Section */
.vision {
    padding: 5rem 0;
    position: relative;
    background-image: url('https://images.unsplash.com/photo-1567899378494-47b22a2ae96a?ixlib=rb-4.0.3&auto=format&fit=crop&w=2000&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.vision::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(241, 245, 249, 0.95);
    z-index: 1;
}

.vision .container {
    position: relative;
    z-index: 2;
}

.vision-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.vision-text h3 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.vision-list {
    list-style: none;
    margin-top: 2rem;
}

.vision-list li {
    padding: 0.75rem 0;
    color: var(--text-light);
    font-size: 1.1rem;
}

.vision-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.stat-card {
    background: var(--white);
    padding: 2rem;
    text-align: center;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.stat-card h4 {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.stat-card p {
    color: var(--text-light);
}

/* Contact Section */
.contact {
    padding: 5rem 0;
}

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

.contact-text {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 3rem;
    line-height: 1.8;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 600px;
    margin: 0 auto;
}

.contact-item {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 15px;
}

.contact-item h4 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.contact-item p {
    color: var(--text-light);
}

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

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

.footer-logo h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.footer-info {
    text-align: right;
}

.footer-info p {
    margin: 0.25rem 0;
    opacity: 0.8;
}

/* Mobile Menu Styles */
.nav-link.active {
    color: var(--accent-color);
}

.nav-link.active::after {
    background-color: var(--accent-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        right: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .hamburger.active span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .vision-content {
        grid-template-columns: 1fr;
    }
    
    .vision-stats {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 2rem;
    }
    
    .footer-info {
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    /* 모바일에서 배경 고정 효과 제거 (성능) */
    .hero {
        background-attachment: scroll;
    }
    
    .vision {
        background-attachment: scroll;
    }
}