body {
    font-family: 'Noto Sans KR', sans-serif;
    margin: 0;
    padding: 0;
    color: #333;
    line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
    margin: 0;
    font-weight: 700;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* Header */
header {
    background-color: #fff;
    border-bottom: 1px solid #ddd;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 24px;
    color: #003366; /* Deep Blue */
}

.logo .sub {
    font-size: 14px;
    color: #666;
    margin-left: 10px;
    font-weight: 400;
}

nav ul {
    display: flex;
    gap: 30px;
}

nav a {
    font-size: 16px;
    font-weight: 500;
    color: #444;
}

nav a:hover {
    color: #003366;
}

/* Hero Section */
.hero {
    background: linear-gradient(rgba(0, 51, 102, 0.8), rgba(0, 51, 102, 0.8)), url('../images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    color: #fff;
    padding: 150px 0;
    text-align: center;
}

/* Placeholder for background image */
.hero {
    background-color: #003366; 
}

.hero h2 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero p {
    font-size: 18px;
    margin-bottom: 10px;
    opacity: 0.9;
}

.hero .desc {
    margin-bottom: 40px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: #D32F2F; /* Red Accent */
    color: #fff;
    font-weight: 700;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #b71c1c;
}

/* Sections */
.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 32px;
    color: #003366;
    margin-bottom: 20px;
}

.section-desc {
    text-align: center;
    margin-bottom: 60px;
    color: #666;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Features */
.features {
    display: flex;
    justify-content: space-between;
    gap: 30px;
    text-align: center;
}

.feature-item {
    flex: 1;
    padding: 30px;
    border: 1px solid #eee;
    border-radius: 8px;
}

.feature-item h4 {
    font-size: 20px;
    color: #003366;
    margin-bottom: 15px;
}

/* Business Grid */
.bg-light {
    background-color: #f9f9f9;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.card {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.card h4 {
    font-size: 18px;
    color: #333;
    margin-bottom: 10px;
    border-bottom: 2px solid #D32F2F;
    display: inline-block;
    padding-bottom: 5px;
}

/* Responsive Design */
@media (max-width: 768px) {
    /* Header & Nav */
    header .container {
        flex-direction: column;
        gap: 15px;
    }
    
    nav ul {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .lang-switch {
        margin-top: 10px;
        text-align: center;
    }

    /* Hero */
    .hero {
        padding: 80px 0;
    }
    .hero h2 {
        font-size: 32px;
    }
    .hero p {
        font-size: 16px;
    }

    /* Sections */
    .section {
        padding: 40px 0;
    }
    .section-title {
        font-size: 26px;
    }

    /* Features (About) */
    .features {
        flex-direction: column;
        gap: 20px;
    }

    /* Grid (Business) */
    .grid {
        grid-template-columns: 1fr;
    }

    /* Subpages */
    .greeting-box, .step-box, .biz-item, .biz-item:nth-child(even) {
        flex-direction: column;
    }
    
    .greeting-img, .biz-img {
        width: 100%;
        height: 250px;
        margin-bottom: 20px;
    }

    .step-item::after {
        display: none; /* Hide arrows on mobile */
    }
    
    .org-row {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }
}