:root {
    --primary: #002D62;      /* Deep Global Blue */
    --secondary: #0056D2;    /* Modern Business Blue */
    --accent: #FFD700;       /* Professional Gold Accent */
    --dark: #1A1A1A;
    --light: #F8F9FA;
    --white: #FFFFFF;
    --glass: rgba(255, 255, 255, 0.1);
}

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;700&family=Noto+Sans+KR:wght@300;500;700&family=Noto+Sans+SC:wght@300;500;700&display=swap');

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

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

/* Header & Navigation */
header {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 2rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    transition: all 0.4s ease;
    background: transparent;
}

header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter : blur(10px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    padding: 1rem 5%;
}

.logo {
    height: 180px; /* Approximately 3 times scaling of visual impact */
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.4s ease;
}

.logo img {
    height: 100%;
    width: auto;
    object-fit: contain;
    mix-blend-mode: screen; /* Effectively removes black background */
    filter: drop-shadow(0 0 20px rgba(0, 86, 210, 0.5));
    transition: all 0.3s ease;
}

header.scrolled .logo {
    height: 80px; /* Normal size when scrolling for UX */
}

.logo:hover img {
    transform: scale(1.05);
}

header.scrolled .logo {
    color: var(--primary);
}

.lang-selector {
    display: flex;
    gap: 10px;
}

.lang-btn {
    padding: 5px 12px;
    border: 1px solid var(--white);
    background: transparent;
    color: var(--white);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.85rem;
}

header.scrolled .lang-btn {
    border-color: var(--primary);
    color: var(--primary);
}

.lang-btn.active {
    background: var(--accent);
    color: var(--dark);
    border-color: var(--accent);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    color: var(--white);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(rgba(0,0,0,0.4), rgba(0,0,0,0.4)), url('../images/hero.png');
    background-size: cover;
    background-position: center;
    transition: transform 0.5s ease-out;
}

.hero:hover .hero-bg {
    transform: scale(1.05);
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 800px;
    padding: 0 20px;
}

.hero h1 {
    font-size: 4.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    text-shadow: 0 4px 10px rgba(0,0,0,0.3);
    animation: fadeInUp 1s ease;
}

.hero p {
    font-size: 1.5rem;
    margin-bottom: 3rem;
    opacity: 0.9;
    animation: fadeInUp 1.2s ease;
}

/* Services */
.services {
    padding: 100px 10%;
    background: var(--light);
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 10px;
}

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

.service-card {
    background: var(--white);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: all 0.4s;
    text-align: center;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.service-card i {
    font-size: 3rem;
    color: var(--secondary);
    margin-bottom: 20px;
}

/* Contact */
.contact {
    padding: 80px 10%;
    text-align: center;
    background: var(--primary);
    color: var(--white);
}

.contact a {
    color: var(--accent);
    font-size: 1.8rem;
    text-decoration: none;
    font-weight: 700;
}

/* Animations */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

[data-lang-content] {
    display: none;
}

[data-lang-content].active-lang {
    display: block;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.8rem; }
    .hero p { font-size: 1.1rem; }
}