:root {

    --navy: #0B1F3A;
    --gold: #C9A227;
    --white: #FFFFFF;
    --dark: #161616;
    --light: #F5F7FA;
}

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

body {

    margin: 0;
    font-family: Arial, sans-serif;
    background: var(--white);
    color: var(--dark);
    line-height: 1.6;
}

.container {

    width: 90%;
    max-width: 1200px;
    margin: auto;
}

header {

    background: var(--navy);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-wrapper {

    display: flex;
    justify-content: space-between;
    align-items: center;

    height: 80px;
}

.logo img {
    height: 60px;   /* ¿øÇÏ´Â ³ôÀÌ */
    width: auto;    /* ºñÀ² À¯Áö */
}

nav ul {

    list-style: none;
    display: flex;
    gap: 25px;
}

nav a {

    color: white;
    margin-left: 20px;
    text-decoration: none;
}

.lang-switch {

    color: var(--gold);
    font-weight: bold;
}

.hero {

    position: relative;
    min-height: 90vh;

    background:
    linear-gradient(rgba(11,31,58,.8),
    rgba(11,31,58,.8)),
    url("../images/hero.jpg");

    background-size: cover;
    background-position: center;

    display: flex;
    align-items: center;
    justify-content: center;

    text-align: center;
}

.hero-content {

    max-width: 900px;
    color: white;
}

.hero h1 {

    font-size: 64px;
    line-height: 1.1;
    margin-bottom: 20px;
}

.hero p {

    font-size: 20px;
    margin-bottom: 35px;
}

.hero-buttons {

    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.btn {

    padding: 14px 30px;
    text-decoration: none;
    border-radius: 4px;
}

.btn-gold {

    background: var(--gold);
    color: white;
}

.btn-outline {

    border: 1px solid white;
    color: white;
}

.featured {

    padding: 100px 0;
}

.featured h2 {

    text-align: center;
    margin-bottom: 50px;
}

.section{
    padding:90px 0;
}

.bg-light{
    background:#f5f7fa;
}

.section-title{
    text-align:center;
    margin-bottom:50px;
}

.page-banner{
    background:linear-gradient(
        rgba(11,31,58,.9),
        rgba(11,31,58,.9)
    ),
    url("../assets/images/ndpr-oxide.jpg");

    background-size:cover;
    background-position:center;

    color:#fff;

    text-align:center;

    padding:140px 0;
}

.product-category{
    color:#C9A227;
    letter-spacing:2px;
    font-size:14px;
}

.spec-table{
    width:100%;
    border-collapse:collapse;
}

.spec-table td{
    border:1px solid #ddd;
    padding:15px;
}

.applications-grid{
    display:grid;
    grid-template-columns:
    repeat(auto-fit,minmax(250px,1fr));
    gap:20px;
}

.app-card{
    background:#fff;
    padding:25px;
    text-align:center;
    border:1px solid #ddd;
}

.doc-grid{
    display:grid;
    grid-template-columns:
    repeat(auto-fit,minmax(250px,1fr));
    gap:20px;
}

.doc-card{
    background:#fff;
    padding:25px;
    text-align:center;
    border:1px solid #ddd;
}

.product-grid {

    display: grid;
    grid-template-columns:
    repeat(auto-fit, minmax(250px,1fr));

    gap: 25px;
}

.product-card {

    text-decoration:none;
    color:var(--dark);
    font-weight:600;
    display:block;
}

.product-card:hover {

    color:var(--gold);
}

.page-banner{

    background:var(--navy);

    color:white;

    padding:120px 0;

    text-align:center;
}

.product-overview{

    padding:80px 0;
}

.about {

    background: var(--light);
    padding: 100px 0;
}

.about-grid {

    margin-top: 40px;

    display: grid;
    grid-template-columns:
    repeat(auto-fit, minmax(250px,1fr));

    gap: 30px;
}

.contact {

    padding: 100px 0;
}

.contact h2 {

    text-align: center;
    margin-bottom: 40px;
}

form {

    max-width: 700px;
    margin: auto;

    display: flex;
    flex-direction: column;
    gap: 15px;
}

input,
textarea {

    padding: 15px;
    border: 1px solid #ccc;
}

button {

    background: var(--gold);
    color: white;
    border: none;
    padding: 15px;
    cursor: pointer;
}

footer {

    background: var(--navy);
    color: white;
    text-align: center;

    padding: 50px 0;
}

@media(max-width:768px){

    nav {
        display:none;
    }

    .hero h1 {
        font-size:40px;
    }

    .hero p {
        font-size:16px;
    }
}