@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard.min.css");

:root {
    --primary-color: #002347;
    /* Deep Navy */
    --accent-color: #D4AF37;
    /* Gold */
    --text-light: #ffffff;
    --text-dark: #333333;
    --bg-light: #f8f9fa;
    --transition: all 0.3s ease;
}

body {
    margin: 0;
    font-family: 'Pretendard', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--bg-light);
}

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

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

/* Header & Nav */
header {
    background: var(--primary-color);
    padding: 1rem 5%;
    position: fixed;
    width: 90%;
    /* Per user spec, though 100% box-sizing might be better, sticking to 90% + padding 5% = 100% width technically if box-sizing border-box is used on header? User didn't specify box-sizing * in their snippet but likely implied. I will add global box-sizing. */
    width: 100%;
    /* Overriding to 100% for safety with padding-box */
    box-sizing: border-box;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

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

.logo {
    color: var(--accent-color);
    font-size: 1.5rem;
    font-weight: bold;
    letter-spacing: 2px;
}

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

nav ul li a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

nav ul li a:hover {
    color: var(--accent-color);
}

/* Hero Section */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(0, 35, 71, 0.7), rgba(0, 35, 71, 0.7)), url('https://placehold.co/1920x1080/002347/D4AF37?text=KPROS+CORP&v=2');
    /* Placeholder for Nano Banana */
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-light);
    padding-top: 80px;
}

.hero-content {
    max-width: 800px;
    padding: 0 1rem;
    animation: fadeInUp 1s ease-out;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-content h1 span {
    color: var(--accent-color);
}

.hero-sub {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.description {
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto 2rem;
    opacity: 0.9;
    color: #e0e0e0;
}

.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    margin: 0 0.5rem;
    transition: 0.3s;
    cursor: pointer;
}

.btn.primary {
    background: var(--accent-color);
    color: var(--primary-color);
}

.btn.secondary {
    border: 2px solid var(--text-light);
    color: var(--text-light);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* Features Section */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 5rem 10%;
    background: var(--bg-light);
    max-width: 1400px;
    margin: 0 auto;
}

.feature-item {
    text-align: center;
    padding: 2.5rem 2rem;
    background: white;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    border-radius: 10px;
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-10px);
}

.feature-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

/* Products Section (Preserved for functionality) */
.products-section {
    padding: 5rem 10%;
    background-color: white;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
}

.tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.tab-btn {
    padding: 0.8rem 2rem;
    border: 2px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    font-weight: 600;
    cursor: pointer;
    border-radius: 5px;
    transition: var(--transition);
}

.tab-btn.active,
.tab-btn:hover {
    background: var(--primary-color);
    color: var(--accent-color);
}

.product-gallery {
    display: none;
    animation: fadeIn 0.5s ease;
}

.product-gallery.active {
    display: block;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.product-card {
    background: var(--bg-light);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.product-image {
    height: 250px;
    background-color: #ddd;
    background-size: cover;
    background-position: center;
}

.product-card h3 {
    padding: 1.5rem 1.5rem 0.5rem;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.product-card p {
    padding: 0 1.5rem 1.5rem;
    color: #666;
    font-size: 0.9rem;
}

.btn-download {
    display: block;
    width: calc(100% - 3rem);
    margin: 0 1.5rem 1.5rem;
    padding: 0.8rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-download:hover {
    background-color: #003366;
}

/* Promotion Section (Preserved) */
.promotion-section {
    padding: 5rem 10%;
    background: var(--bg-light);
}

.promotion-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.promo-card {
    background: var(--primary-color);
    color: white;
    padding: 3rem;
    border-radius: 10px;
    text-align: left;
}

.promo-card h3 {
    color: var(--accent-color);
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background: #111;
    color: #777;
    font-size: 0.9rem;
}

/* Contact Section (merged into footer area or separate?) User didn't specify styles, keeping minimal compatibility */
.contact-section {
    padding: 4rem 10%;
    text-align: center;
    background: white;
}

.contact-section h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Mobile Responsive */
@media (max-width: 768px) {

    .features,
    .product-grid,
    .promotion-grid {
        grid-template-columns: 1fr;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    nav ul {
        display: none;
        /* Needs JS toggle */
    }
}