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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    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);
    z-index: 1000;
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-brand {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: #2563eb;
}

.logo-icon {
    margin-right: 0.5rem;
    font-size: 1.8rem;
}

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

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

/* index.html과 about.html에서 네비게이션 링크를 bold 흰색으로 변경 */
body:has(.hero) .nav-link,
body:has(.page-about) .nav-link {
    color: #ffffff !important;
    font-weight: 700 !important;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.nav-link:hover {
    color: #2563eb;
}

/* index.html과 about.html에서 네비게이션 링크 호버 효과 */
body:has(.hero) .nav-link:hover,
body:has(.page-about) .nav-link:hover {
    color: #ffffff !important;
    opacity: 0.8;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #2563eb;
    transition: width 0.3s ease;
}

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

/* index.html과 about.html에서 네비게이션 링크 언더라인 효과 */
body:has(.hero) .nav-link::after,
body:has(.page-about) .nav-link::after {
    background: #ffffff;
}

body:has(.hero) .nav-link:hover::after,
body:has(.page-about) .nav-link:hover::after {
    background: #ffffff;
}

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

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    /* background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); */
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* background: url('https://images.pexels.com/photos/3825581/pexels-photo-3825581.jpeg?auto=compress&cs=tinysrgb&w=1920&h=1080&fit=crop') center/cover; */
    background: url('../images/image_main_background_image.png') center/cover;
    
    /* script.js의 parallax 효과를 위해 추가 */
    will-change: transform;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.8), rgba(147, 51, 234, 0.8));
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    opacity: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: white;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.8);
    display: block;
}

.gradient-text {
    background: linear-gradient(45deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
    line-height: 1.6;
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.8);
    display: block;
}

.hero-buttons {
    /* display: flex;
    gap: 1rem; */
    animation-delay: 0.4s;
}

/* Hero Acronym Text Style */
.hero-acronym {
    margin-bottom: 2rem; /* 버튼과의 간격 */
    
    opacity: 1;
    transform: translateY(0);
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.1s;
}

.hero-acronym h1 {
    font-size: 3.5rem; /* 폰트 크기 */
    font-weight: 700;  /* 폰트 굵기 */
    /* [수정] 기본 텍스트 색상을 흰색으로 변경 */
    color: #ffffff;    
    line-height: 1.3;  /* 줄 간격 */
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.8); /* 가독성을 위한 그림자 */
    margin: 0;
}

/* [신규] 첫 글자 강조 스타일 */
.acronym-highlight {
    color: #fbbf24;      /* 강조될 첫 글자는 노란색 */
    font-weight: 900;  /* 더 굵게 강조 */
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
}

.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(45deg, #3b82f6, #8b5cf6);
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.6);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #2563eb;
    transform: translateY(-2px);
}

/* Floating Cards Animation */
.hero-visual {
    position: relative;
    height: 400px;
}

.floating-cards {
    position: relative;
    height: 100%;
}

.card {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 2rem;
    color: white;
    text-align: center;
    animation: float 6s ease-in-out infinite;
}

.card i {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.card-1 {
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.card-2 {
    top: 40%;
    right: 10%;
    animation-delay: 2s;
}

.card-3 {
    bottom: 10%;
    left: 30%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* Section Styles */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: #6b7280;
    max-width: 600px;
    margin: 0 auto;
}

/* About Section */
.about {
    padding: 6rem 0;
    background: #f9fafb;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h3 {
    font-size: 2rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 1.5rem;
}

.about-text p {
    font-size: 1.125rem;
    color: #4b5563;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.stats {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: #2563eb;
}

.stat-label {
    font-size: 0.875rem;
    color: #6b7280;
    font-weight: 500;
}

.tech-showcase {
    display: grid;
    gap: 2rem;
}

.tech-item {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.tech-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.tech-item i {
    font-size: 2.5rem;
    color: #2563eb;
    margin-bottom: 1rem;
}

.tech-item h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 0.5rem;
}

.tech-item p {
    color: #6b7280;
    line-height: 1.6;
}

/* Services Section */
.services {
    padding: 6rem 0;
    background: white;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.service-card {
    background: white;
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #e5e7eb;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(45deg, #3b82f6, #8b5cf6);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.service-icon i {
    font-size: 2rem;
    color: white;
}

.service-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 1rem;
}

.service-card p {
    color: #6b7280;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.service-features {
    list-style: none;
    margin-bottom: 2rem;
}

.service-features li {
    padding: 0.5rem 0;
    color: #4b5563;
    position: relative;
    padding-left: 1.5rem;
}

.service-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #10b981;
    font-weight: bold;
}

.service-btn {
    background: linear-gradient(45deg, #3b82f6, #8b5cf6);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 25px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
}

.service-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(59, 130, 246, 0.4);
}

/* History Section */
.history {
    padding: 6rem 0;
    background: #f9fafb;
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: linear-gradient(to bottom, #3b82f6, #8b5cf6);
}

.timeline-item {
    display: flex;
    margin-bottom: 4rem;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row-reverse;
}

.timeline-year {
    background: linear-gradient(45deg, #3b82f6, #8b5cf6);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 25px;
    font-size: 1.25rem;
    font-weight: 600;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    min-width: 80px;
    text-align: center;
}

.timeline-content {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    width: 45%;
    margin-top: 1rem;
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-right: 55%;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: 55%;
}

.timeline-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 1rem;
}

.timeline-content p {
    color: #6b7280;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.timeline-content ul {
    list-style: none;
}

.timeline-content li {
    padding: 0.25rem 0;
    color: #4b5563;
    position: relative;
    padding-left: 1.5rem;
}

.timeline-content li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #3b82f6;
    font-weight: bold;
}

/* Contact Section */
.contact {
    padding: 6rem 0;
    background: white;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(45deg, #3b82f6, #8b5cf6);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon i {
    font-size: 1.5rem;
    color: white;
}

.contact-details h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 0.5rem;
}

.contact-details p {
    color: #6b7280;
    line-height: 1.6;
}

.contact-form {
    background: #f9fafb;
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.contact-form h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 2rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid #d1d5db;
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    background: white;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
.footer {
    background: #1f2937;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-brand i {
    margin-right: 0.5rem;
    color: #3b82f6;
}

.footer-section p {
    color: #9ca3af;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: #374151;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: #3b82f6;
    transform: translateY(-2px);
}

.footer-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: white;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #3b82f6;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    color: #9ca3af;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        right: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        justify-content: start;
        align-items: center;
        padding-top: 2rem;
        transition: right 0.3s ease;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);}

    .hero-acronym h1 {
        font-size: 2.5rem;
        line-height: 1.4;
    }

    .nav-menu.active {
        right: 0;
    }

    .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-content {
        /* grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem; */
        text-align: center !important;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .stats {
        justify-content: center;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        flex-direction: row !important;
        padding-left: 50px;
    }

    .timeline-year {
        left: 20px;
        transform: translateX(-50%);
        font-size: 1rem;
        padding: 0.5rem 1rem;
    }

    .timeline-content {
        width: 100%;
        margin-left: 0 !important;
        margin-right: 0 !important;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }
}

/* 1. Header 로고 이미지 스타일 */
.nav-brand {
    /* 로고가 너무 크지 않도록 높이 제한 */
    max-height: 40px; 
    display: flex;
    align-items: center;
}

.logo-image {
    height: 30px; /* 로고 이미지 높이 */
    width: auto;
    object-fit: contain;
}

/* 2. Products 페이지 신규 레이아웃 */
.product-feature-list {
    padding: 6rem 0;
    background: #f9fafb;
}

.product-feature-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-bottom: 5rem;
    background: #ffffff;
    padding: 3rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.07);
}

/* 짝수 번째 아이템은 이미지/텍스트 순서 변경 */
.product-feature-item:nth-child(even) {
    grid-template-columns: 1fr 1fr;
}

.product-feature-item:nth-child(even) .product-image {
    order: 2; /* 이미지를 2번째로 */
}
.product-feature-item:nth-child(even) .product-description {
    order: 1; /* 텍스트를 1번째로 */
}

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

.product-image img {
    max-width: 100%;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.product-description h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #2563eb;
    margin-bottom: 0.5rem;
}

.product-description h2 {
    font-size: 2rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 1.5rem;
}

.product-description p {
    font-size: 1.125rem;
    color: #4b5563;
    margin-bottom: 2rem;
    line-height: 1.7;
}

.product-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e5e7eb;
}

/* .stat 클래스는 about.html의 것과 공유 */
.product-stats .stat-number {
    font-size: 2.25rem;
}
.product-stats .stat-number small {
    font-size: 1rem;
    color: #6b7280;
    margin-left: 4px;
}

/* 3. 모바일 반응형 (Products) */
@media (max-width: 768px) {
    .product-feature-item,
    .product-feature-item:nth-child(even) {
        /* 모바일에서는 1열로 쌓음 */
        grid-template-columns: 1fr; 
        gap: 2rem;
        padding: 2rem;
    }

    .product-feature-item:nth-child(even) .product-image {
        order: 1; /* 순서 초기화 */
    }
    .product-feature-item:nth-child(even) .product-description {
        order: 2; /* 순서 초기화 */
    }

    .product-description h2 {
        font-size: 1.75rem;
    }
}