:root {
    --primary-color: #004e92; /* Deep Blue - Trust */
    --accent-color: #00b4db; /* Cyan/Teal - Tech/Medical */
    --text-color: #333333;
    --text-light: #666666;
    --bg-color: #ffffff;
    --bg-secondary: #f4f8fb;
    --white: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.85);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    --font-en: 'Inter', sans-serif;
    --font-kr: 'Noto Sans KR', sans-serif;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
    font-family: var(--font-kr), var(--font-en);
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

/* Header & Nav */
header {
    position: fixed;
    top: 0;
    width: 100%;
    height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5%;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 1px 10px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.logo {
    font-family: var(--font-en);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

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

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    position: relative;
    transition: var(--transition);
}

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

nav a:hover::after,
nav a.active::after {
    width: 100%;
}

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

.lang-switch {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-switch button {
    background: none;
    border: none;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-light);
    transition: var(--transition);
    font-size: 0.9rem;
}

.lang-switch button.active,
.lang-switch button:hover {
    color: var(--primary-color);
}

.lang-switch .divider {
    color: #ddd;
}

/* Sections */
.section {
    padding: 100px 5%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    text-align: center;
    color: var(--primary-color);
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

.section-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 4px;
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
    margin: 10px auto 0;
    border-radius: 2px;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
    text-align: center;
    padding-top: 140px; /* Offset for header */
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3.5rem;
    font-family: var(--font-en);
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero h2 {
    font-size: 2rem;
    font-weight: 300;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Simple Intro Section */
.intro-simple {
    background-color: var(--white);
    text-align: center;
}

.intro-eyebrow {
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 1rem;
}

.intro-title {
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.2rem;
}

.intro-text {
    color: var(--text-light);
    max-width: 720px;
    margin: 0 auto 2rem;
    font-size: 1.05rem;
}

.intro-points {
    display: grid;
    gap: 1rem;
    max-width: 640px;
    margin: 0 auto;
    text-align: left;
}

.intro-point {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.9rem 1.1rem;
    border-radius: 14px;
    background: var(--bg-secondary);
    border: 1px solid rgba(0,0,0,0.04);
}

.intro-point .dot {
    width: 10px;
    height: 10px;
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    margin-top: 0.45rem;
    flex: 0 0 auto;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: linear-gradient(to right, var(--primary-color), #0062cc);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    box-shadow: 0 10px 20px rgba(0, 78, 146, 0.2);
    transition: var(--transition);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0, 78, 146, 0.3);
}

/* About Section */
.about {
    background-color: var(--white);
}

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

.about-card {
    background: var(--bg-secondary);
    padding: 2.5rem;
    border-radius: 20px;
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.03);
}

.about-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow);
    background: var(--white);
}

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

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

/* Join Section */
.join {
    background-color: var(--bg-secondary);
}

.join-intro {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 1.2rem;
}

.keywords-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.keyword-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.03);
    border-top: 4px solid var(--accent-color);
}

.keyword-item h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.contact-box {
    text-align: center;
    margin-top: 2rem;
}

.email-link {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
    text-decoration: none;
    position: relative;
    display: inline-block;
}

.email-link::after {
    content: '';
    display: block;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: var(--transition);
}

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

/* FAQ Section */
.faq {
    background-color: var(--white);
}

.accordion {
    max-width: 800px;
    margin: 0 auto;
}

.accordion-item {
    border-bottom: 1px solid #eee;
    margin-bottom: 1rem;
}

.accordion-header {
    width: 100%;
    padding: 1.5rem 0;
    background: none;
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
    color: var(--text-color);
    transition: var(--transition);
    font-family: inherit;
}

.accordion-header:hover {
    color: var(--primary-color);
}

.accordion-header .icon {
    font-size: 1.5rem;
    color: var(--accent-color);
    transition: var(--transition);
}

.accordion-header.active .icon {
    transform: rotate(45deg);
    color: var(--primary-color);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.accordion-content p {
    padding-bottom: 1.5rem;
    color: var(--text-light);
}

/* Footer */
footer {
    background-color: #f8f9fa;
    padding: 3rem 5%;
    border-top: 1px solid #eee;
    text-align: center;
}

.footer-logo {
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.footer-info p {
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.footer-info a {
    color: var(--primary-color);
    text-decoration: none;
}

.copyright {
    margin-top: 2rem;
    font-size: 0.9rem;
    color: #999;
}

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

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

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

/* Mobile Responsiveness */
@media (max-width: 768px) {
    header {
        padding: 0 1.5rem;
    }
    
    .logo {
        font-size: 1.2rem;
    }

    nav {
        display: none; /* Simplification: Use hamburger menu for full implementation, but for now simple hidden on mobile or wrap */
        /* For this task, let's keep it simple or stack it */
    }

    /* Simple Mobile Menu Fallback (Not fully implemented without JS toggle but laying ground) */
    .hero h1 { font-size: 2.5rem; }
    .section-title { font-size: 2rem; }
}

/* Scroll Active State (handled by JS, but class here) */
.nav-active {
    color: var(--primary-color) !important;
}


/* Logo Image */
.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-img {
    height: 64px;
    width: auto;
    display: block;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

.logo-text {
    font-family: var(--font-en);
    font-weight: 700;
    font-size: 1.4rem;
    color: var(--primary-color);
}


/* Company Overview Section */
.company {
    background-color: var(--bg-secondary);
}

.company-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    align-items: center;
    margin-bottom: 3rem;
}

.company-row.reverse {
    direction: rtl;
}

.company-row.reverse > * {
    direction: ltr;
}

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

.company-image {
    max-width: 100%;
    border-radius: 20px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(0,0,0,0.04);
}

.company-image.tall {
    max-height: 520px;
    object-fit: contain;
}

.company-text h3 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-size: 1.6rem;
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 0.75rem;
}

.feature-list li {
    background: var(--white);
    padding: 0.9rem 1rem;
    border-radius: 12px;
    border: 1px solid rgba(0,0,0,0.04);
    box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

/* Team Section */
.team {
    background-color: var(--white);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
}

.team-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 18px;
    border: 1px solid rgba(0,0,0,0.04);
    box-shadow: var(--shadow);
}

.team-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.team-card ul {
    list-style: none;
    padding: 0;
    display: grid;
    gap: 0.6rem;
    color: var(--text-light);
}

.company-image.small {
    max-width: 420px;
}