:root {
    --primary-yellow: #f2a900;
    --primary-yellow-hover: #d19200;
    --dark-bg: #111111;
    --darker-bg: #0a0a0a;
    --charcoal-bg: #1f1f1f;
    --text-light: #f5f5f5;
    --text-dark: #111;
    --text-muted: #888888;
    --border-color: #333333;
}

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

body {
    font-family: 'Outfit', 'Montserrat', sans-serif;
    color: var(--text-light);
    background-color: var(--dark-bg);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
.text-yellow {
    color: var(--primary-yellow);
}

.text-dark {
    color: var(--text-dark);
}

.text-light {
    color: var(--text-light);
}

.text-muted {
    color: var(--text-muted);
}

.icon-yellow {
    stroke: var(--primary-yellow);
    width: 48px;
    height: 48px;
    margin-bottom: 1.5rem;
}

/* Layout */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 5%;
}

.section {
    padding: 8rem 0;
}

.section-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 2rem;
    letter-spacing: -1px;
    line-height: 1.2;
}

.header-center {
    text-align: center;
    margin-bottom: 4rem;
}

.header-center h2 {
    font-size: 3.5rem;
}

.subtitle {
    font-size: 1.25rem;
    font-weight: 300;
}

.mb-5 {
    margin-bottom: 5rem;
}

/* Backgrounds */
.dark-bg {
    background-color: var(--dark-bg);
}

.darker-bg {
    background-color: var(--darker-bg);
}

.bg-charcoal {
    background-color: var(--charcoal-bg);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.bg-yellow {
    background-color: var(--primary-yellow);
}

/* Buttons */
.primary-btn {
    display: inline-block;
    background-color: var(--primary-yellow);
    color: var(--text-dark);
    padding: 1rem 2.5rem;
    text-decoration: none;
    font-weight: 700;
    border-radius: 4px;
    transition: background 0.3s;
    text-transform: uppercase;
    font-size: 1rem;
}

.primary-btn:hover {
    background-color: #fff;
    color: var(--text-dark);
}

.secondary-btn {
    display: inline-block;
    background-color: transparent;
    border: 1px solid rgba(255, 255, 255, 0.4);
    color: #fff;
    padding: 1rem 2.5rem;
    text-decoration: none;
    font-weight: 600;
    border-radius: 4px;
    transition: all 0.3s;
    text-transform: uppercase;
}

.secondary-btn:hover {
    border-color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

.dark-btn {
    display: inline-block;
    background-color: var(--dark-bg);
    color: var(--text-light);
    padding: 1.2rem 3rem;
    text-decoration: none;
    font-weight: 800;
    border-radius: 4px;
    transition: background 0.3s;
    text-transform: uppercase;
    font-size: 1.1rem;
}

.dark-btn:hover {
    background-color: var(--text-dark);
    color: var(--primary-yellow);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(20, 20, 20, 0.6);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 90px;
}

.logo {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    font-weight: 900;
    color: #fff;
    letter-spacing: 2px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sub-logo {
    font-weight: 400;
    color: var(--primary-yellow);
    font-size: 0.9rem;
    letter-spacing: 3px;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: color 0.3s;
}

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

.btn-outline {
    border: 1px solid var(--primary-yellow);
    padding: 0.6rem 1.5rem;
    border-radius: 30px;
    color: var(--primary-yellow) !important;
}

.btn-outline:hover {
    background: var(--primary-yellow);
    color: #000 !important;
}

/* Hero */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: url('https://images.unsplash.com/photo-1486406146926-c627a92ad1ab?q=80&w=2070&auto=format&fit=crop') center/cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(10, 10, 10, 0.9) 0%, rgba(31, 31, 31, 0.7) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 900px;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(242, 169, 0, 0.1);
    color: var(--primary-yellow);
    border: 1px solid rgba(242, 169, 0, 0.3);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 2px;
    font-weight: 600;
    margin-bottom: 2rem;
    border-radius: 20px;
}

.hero-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 5rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -2px;
}

.hero-title .highlight {
    color: var(--primary-yellow);
}

.hero-subtitle {
    font-size: 1.3rem;
    color: #ccc;
    font-weight: 300;
    line-height: 1.8;
    margin-bottom: 3rem;
}

.hero-subtitle strong {
    color: #fff;
    font-weight: 600;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.scroll-down {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8rem;
    letter-spacing: 2px;
    font-weight: 400;
    text-transform: uppercase;
    animation: float 2s infinite ease-in-out;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0) translateX(-50%);
    }

    50% {
        transform: translateY(10px) translateX(-50%);
    }
}

/* Tech Section */
.split-layout {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    border-radius: 0;
    overflow: hidden;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.8);
}

.left-col,
.right-col {
    padding: 6rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.lead-text {
    font-size: 1.6rem;
    font-weight: 600;
    margin-bottom: 2.5rem;
    font-family: 'Montserrat', sans-serif;
}

.desc {
    font-size: 1.1rem;
    color: #bbb;
    line-height: 1.8;
}

.desc strong {
    color: #fff;
    font-weight: 600;
}

.tech-stats {
    gap: 3rem;
}

.stat-item {
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.stat-item:last-child {
    border: none;
    padding-bottom: 0;
}

.stat-icon {
    stroke: #111;
    width: 32px;
    height: 32px;
    margin-bottom: 1rem;
}

.stat-item h3 {
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    font-family: 'Montserrat', sans-serif;
}

.stat-item p {
    font-size: 1.05rem;
    font-weight: 500;
    color: #444;
}

/* Benefits */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
    margin-bottom: 2rem;
}

.feature-card {
    background: var(--charcoal-bg);
    padding: 4rem 3rem;
    border: 1px solid var(--border-color);
    transition: transform 0.4s, border-color 0.4s;
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-yellow);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

.feature-card h3 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #fff;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 1.05rem;
    line-height: 1.7;
}

/* Products */
.product-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.product-item {
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.4s;
}

.product-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.8);
    border-color: #555;
}

.product-img {
    height: 350px;
    background-color: #333;
}

.block-sidewalk {
    background: url('https://images.unsplash.com/photo-1584485542478-43ec7f753c25?q=80&w=2000&auto=format&fit=crop') center/cover;
}

.block-roadway {
    background: url('https://images.unsplash.com/photo-1580918737233-0c46aee281cc?q=80&w=2000&auto=format&fit=crop') center/cover;
}

.product-body {
    padding: 4rem 3rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.product-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
}

.product-desc {
    color: #bbb;
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
}

.specs {
    list-style: none;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
}

.specs li {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1rem;
    color: #ccc;
    margin-bottom: 1rem;
}

.specs li i {
    stroke: var(--primary-yellow);
    width: 20px;
    height: 20px;
    opacity: 0.8;
}

.specs strong {
    color: #fff;
    font-weight: 600;
    min-width: 100px;
}

/* Designs */
.type-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.type-card {
    background: var(--charcoal-bg);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    text-align: center;
}

.type-visual {
    height: 120px;
    background: #333;
    margin-bottom: 1.5rem;
    opacity: 0.5;
    position: relative;
    overflow: hidden;
}

/* Mocking patterns */
.type-1 {
    background: repeating-linear-gradient(0deg, #444, #444 1px, transparent 1px, transparent 20px), repeating-linear-gradient(90deg, #444, #444 1px, transparent 1px, transparent 20px);
}

.type-2 {
    background: repeating-linear-gradient(0deg, #444, #444 1px, transparent 1px, transparent 30px), repeating-linear-gradient(90deg, #444, #444 1px, transparent 1px, transparent 60px);
}

.type-3 {
    background: radial-gradient(circle, transparent 20%, #444 20%, #444 80%, transparent 80%, transparent), radial-gradient(circle, transparent 20%, #444 20%, #444 80%, transparent 80%, transparent) 25px 25px;
    background-size: 50px 50px;
}

.type-4 {
    background: repeating-linear-gradient(90deg, #444, #444 5px, transparent 5px, transparent 40px);
}

.type-5 {
    background: repeating-linear-gradient(45deg, #444, #444 2px, transparent 2px, transparent 15px);
}

.type-6 {
    background: repeating-linear-gradient(-45deg, #444, #444 2px, transparent 2px, transparent 20px);
}

.type-7 {
    background: repeating-radial-gradient(circle, #444, #444 2px, transparent 2.5px, transparent 10px);
}

.type-card h4 {
    font-size: 1rem;
    color: #aaa;
    font-weight: 500;
}

/* Footer */
.footer {
    background-color: #000;
    padding: 5rem 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-logo {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 1.5rem;
    letter-spacing: 2px;
}

.footer-info {
    font-size: 0.95rem;
    color: #666;
    line-height: 1.8;
}

/* Video Comparison */
.video-compare-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-top: 3rem;
}

.video-box {
    background: #000;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-color);
    transition: transform 0.3s;
}

.video-label {
    padding: 1rem;
    text-align: center;
    font-weight: 600;
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.video-placeholder {
    height: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: #111;
    position: relative;
    border-bottom: 4px solid transparent;
}

.highlight-box {
    border-color: var(--primary-yellow);
    box-shadow: 0 0 30px rgba(242, 169, 0, 0.15);
    transform: scale(1.02);
}

.highlight-box .video-placeholder {
    border-bottom: 4px solid var(--primary-yellow);
    background: linear-gradient(180deg, #111 0%, rgba(242, 169, 0, 0.05) 100%);
}

.video-placeholder video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

.video-placeholder i,
.video-placeholder span {
    z-index: 2;
}

@media (max-width: 1024px) {
    .split-layout {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 4rem;
    }

    .product-showcase {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 3rem;
    }

    .nav-links {
        display: none;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

}

/* Applications Grid (Premium Glassmorphism) */
.applications-section {
    position: relative;
    padding: 8rem 0;
    overflow: hidden;
}

.applications-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(242, 169, 0, 0.05) 0%, transparent 60%);
    z-index: 0;
    pointer-events: none;
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    position: relative;
    z-index: 1;
}

.app-card {
    background: rgba(25, 25, 25, 0.6);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 2.5rem 2rem;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    cursor: pointer;
    text-decoration: none;
    color: var(--text-light);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.app-card:hover {
    transform: translateY(-10px) scale(1.02);
    border-color: rgba(242, 169, 0, 0.5);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), inset 0 0 20px rgba(242, 169, 0, 0.05);
    background: rgba(30, 30, 30, 0.8);
}

.app-card-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--primary-yellow), #ffd700);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: transform 0.4s;
}

.app-card:hover .app-card-icon {
    transform: scale(1.2);
}

.app-card-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    font-family: 'Montserrat', sans-serif;
    line-height: 1.3;
}
.app-card-title.ko-text {
    font-family: 'Noto Sans KR', sans-serif;
}

.app-card-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: all 0.4s ease;
}

.app-card:hover .app-card-desc {
    opacity: 1;
    max-height: 100px;
    margin-top: 1rem;
}

/* Premium Glow Effect for CTA */
.btn-glow {
    position: relative;
    overflow: hidden;
    z-index: 1;
}
.btn-glow::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.3s;
    z-index: -1;
    transform: scale(0.5);
}
.btn-glow:hover::after {
    opacity: 1;
    transform: scale(1);
    animation: pulseGlow 1.5s infinite alternate;
}

@keyframes pulseGlow {
    0% { transform: scale(0.9); opacity: 0.5; }
    100% { transform: scale(1.1); opacity: 0.8; }
}