:root {
    --bg-color: #050505;
    --surface-color: #111111;
    --surface-hover: #1a1a1a;
    --primary-gold: #D4AF37;
    --gold-light: #F3E5AB;
    --gold-dark: #aa8c2c;
    --text-main: #f0f0f0;
    --text-muted: #a0a0a0;
    --gradient-gold: linear-gradient(135deg, var(--gold-light), var(--primary-gold), var(--gold-dark));
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

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

h1, h2, h3, .logo-text {
    font-family: 'Playfair Display', serif;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography & Utilities */
.highlight {
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.mt-4 {
    margin-top: 2rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    font-weight: 600;
    border-radius: 4px;
    transition: var(--transition);
    cursor: pointer;
    font-family: 'Montserrat', sans-serif;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.9rem;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    z-index: -1;
}

.btn:hover::before {
    left: 0;
}

.btn-primary {
    background: var(--gradient-gold);
    color: #000;
    border: none;
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(212, 175, 55, 0.5);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--primary-gold);
    border: 1px solid var(--primary-gold);
}

.btn-outline:hover {
    background: rgba(212, 175, 55, 0.1);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(5, 5, 5, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    padding: 10px 0;
    background: rgba(5, 5, 5, 0.95);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.5);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    color: var(--primary-gold);
}

.logo i {
    font-size: 1.8rem;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links a {
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-gold);
    transition: var(--transition);
}

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

.nav-links a:hover::after, .nav-links a.active::after {
    width: 100%;
}

.nav-links a.active {
    color: var(--primary-gold);
}

.menu-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--primary-gold);
    cursor: pointer;
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, transparent 0%, var(--bg-color) 100%), 
                url('https://images.unsplash.com/photo-1508514177221-188b1cf16e9d?q=80&w=2072&auto=format&fit=crop') center/cover no-repeat;
    opacity: 0.4;
    z-index: -2;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(5,5,5,0.9) 0%, rgba(5,5,5,0.4) 100%);
    z-index: -1;
}

.sun-glow {
    position: absolute;
    top: 20%;
    right: 10%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(212,175,55,0.15) 0%, transparent 70%);
    border-radius: 50%;
    z-index: -1;
    animation: pulse 4s infinite alternate;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.8; }
    100% { transform: scale(1.2); opacity: 1; }
}

.hero-content {
    max-width: 800px;
}

.hero-title {
    font-size: 4.5rem;
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 4px;
    color: var(--primary-gold);
    margin-bottom: 15px;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: 20px;
}

/* Features Section */
.features {
    padding: 100px 0;
    background-color: var(--surface-color);
}

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

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.divider {
    width: 60px;
    height: 3px;
    background: var(--gradient-gold);
    margin: 0 auto;
    border-radius: 2px;
}

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

.feature-card {
    background: var(--bg-color);
    padding: 40px 30px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid rgba(212, 175, 55, 0.1);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-gold);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: rgba(212, 175, 55, 0.3);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.icon-wrapper {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: rgba(212, 175, 55, 0.05);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--primary-gold);
    transition: var(--transition);
}

.feature-card:hover .icon-wrapper {
    background: var(--gradient-gold);
    color: #000;
    transform: rotateY(360deg);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
}

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

/* Services Section */
.services {
    padding: 100px 0;
    background: var(--bg-color);
}

.service-banner {
    display: flex;
    background: linear-gradient(135deg, var(--surface-color) 0%, rgba(30, 30, 30, 1) 100%);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid rgba(212, 175, 55, 0.1);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

.service-content {
    flex: 1;
    padding: 60px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.service-content h2 {
    font-size: 2.2rem;
    margin-bottom: 30px;
    color: var(--primary-gold);
}

.service-steps {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 30px;
}

.step {
    font-weight: 600;
    padding: 8px 16px;
    background: rgba(212, 175, 55, 0.1);
    border-radius: 30px;
    border: 1px solid rgba(212, 175, 55, 0.2);
    color: var(--gold-light);
}

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

.service-content p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.service-image {
    flex: 1;
    background: url('https://images.unsplash.com/photo-1592833159155-c62df1b65634?q=80&w=2069&auto=format&fit=crop') center/cover;
    position: relative;
    min-height: 400px;
}

.glow-panel {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(212,175,55,0.2) 0%, transparent 60%);
}

/* Footer */
footer {
    background: #000;
    padding: 80px 0 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    margin-bottom: 20px;
}

.footer-brand p {
    color: var(--text-muted);
    max-width: 300px;
}

.footer-contact h3 {
    font-family: 'Montserrat', sans-serif;
    color: var(--primary-gold);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.footer-contact p {
    color: var(--text-muted);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-contact i {
    color: var(--primary-gold);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Products Section */
.products {
    padding: 100px 0;
    background: var(--surface-color);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.product-card {
    background: var(--bg-color);
    border-radius: 12px;
    border: 1px solid rgba(212, 175, 55, 0.1);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-10px);
    border-color: rgba(212, 175, 55, 0.3);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.product-img-wrapper {
    position: relative;
    width: 100%;
    height: 250px;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.product-img-wrapper img {
    max-width: 80%;
    max-height: 80%;
    object-fit: contain;
    transition: var(--transition);
}

.product-card:hover .product-img-wrapper img {
    transform: scale(1.05);
}

.brand-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--gradient-gold);
    color: #000;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 20px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

.product-info {
    padding: 25px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.product-info h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--primary-gold);
    font-family: 'Montserrat', sans-serif;
}

.product-specs {
    list-style: none;
    flex: 1;
}

.product-specs li {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 10px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.product-specs li i {
    font-size: 0.5rem;
    color: var(--primary-gold);
    margin-top: 6px;
}

.product-specs li strong {
    color: var(--text-main);
}

/* Zalo Floating Button */
.zalo-floating-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
    background: #0068ff;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 5px 15px rgba(0, 104, 255, 0.4);
    transition: var(--transition);
    text-decoration: none;
}

.zalo-floating-btn:hover {
    transform: translateY(-5px) scale(1.1);
    box-shadow: 0 8px 25px rgba(0, 104, 255, 0.6);
}

.zalo-icon-wrapper {
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
    font-family: sans-serif;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

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

.fade-in-scroll {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.fade-in-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 992px) {
    .hero-title { font-size: 3.5rem; }
    .service-banner { flex-direction: column; }
}

@media (max-width: 768px) {
    .nav-links, .nav-btn { display: none; }
    .menu-toggle { display: block; }
    .hero-title { font-size: 2.8rem; }
    .hero-actions { flex-direction: column; }
    .btn { width: 100%; text-align: center; }
    .footer-content { flex-direction: column; }
}