:root {
    /* Glass Liquid Colors - Cool Palette */
    --color-primary: #3B82F6;
    --color-secondary: #10B981;
    --color-accent: #8B5CF6;
    --color-bg-dark: #0F172A;
    --color-bg-darker: #020617;
    --color-bg-glass: rgba(30, 41, 59, 0.4);
    --color-text-primary: #F1F5F9;
    --color-text-secondary: #CBD5E1;
    --color-text-muted: #94A3B8;
    --color-border-glass: rgba(148, 163, 184, 0.2);
    --color-success: #10B981;
    --color-warning: #F59E0B;

    /* Gradients - Cool & Vibrant */
    --gradient-primary: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 50%, #10B981 100%);
    --gradient-hero: linear-gradient(180deg, #0F172A 0%, #020617 100%);
    --gradient-glass: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    --gradient-liquid: radial-gradient(circle at 30% 50%, rgba(59, 130, 246, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(139, 92, 246, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 50% 80%, rgba(16, 185, 129, 0.2) 0%, transparent 50%);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;

    /* Border Radius */
    --radius-sm: 0.75rem;
    --radius-md: 1.25rem;
    --radius-lg: 1.75rem;
    --radius-xl: 2.5rem;

    /* Shadows */
    --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    --shadow-glow-blue: 0 0 60px rgba(59, 130, 246, 0.4);
    --shadow-glow-purple: 0 0 60px rgba(139, 92, 246, 0.4);
    --shadow-glow-green: 0 0 60px rgba(16, 185, 129, 0.3);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--color-bg-darker);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-liquid);
    z-index: -1;
    animation: liquidMove 15s ease-in-out infinite;
}

@keyframes liquidMove {

    0%,
    100% {
        opacity: 0.6;
        transform: scale(1);
    }

    50% {
        opacity: 0.8;
        transform: scale(1.1);
    }
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Glass Effect Utility */
.glass {
    background: var(--color-bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--color-border-glass);
    box-shadow: var(--shadow-glass);
}

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

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(16, 185, 129, 0.1) 0%, transparent 50%);
    animation: pulse 10s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 0.6;
        transform: scale(1);
    }

    50% {
        opacity: 1;
        transform: scale(1.05);
    }
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border-glass);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(15, 23, 42, 0.8);
    box-shadow: var(--shadow-glass);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

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

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

/* Hero Content */
.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding-top: var(--spacing-3xl);
}

.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(59, 130, 246, 0.2);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 100px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    animation: slideDown 0.6s ease;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.2);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

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

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease 0.2s both;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 20px rgba(59, 130, 246, 0.5));
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease 0.4s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-3xl);
    animation: fadeInUp 0.8s ease 0.6s both;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-blue);
}

.btn-secondary {
    background: rgba(59, 130, 246, 0.1);
    color: white;
    border: 1px solid var(--color-border-glass);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--color-primary);
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
}

/* Stats */
.stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-3xl);
    animation: fadeInUp 0.8s ease 0.8s both;
}

.stat-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: rgba(59, 130, 246, 0.05);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-glass);
    min-width: 150px;
    transition: all var(--transition-base);
}

.stat-item:hover {
    transform: translateY(-5px);
    background: rgba(59, 130, 246, 0.1);
    box-shadow: var(--shadow-glass);
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-xs);
}

/* Hero Image */
.hero-image {
    margin-top: var(--spacing-3xl);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease 1s both;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), var(--shadow-glow-blue);
    border: 1px solid var(--color-border-glass);
}

/* Pricing Section */
.pricing-section {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
}

/* Pricing Grid */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.pricing-card {
    position: relative;
    background: rgba(30, 41, 59, 0.4);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--color-border-glass);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-glass);
}

.pricing-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-glass);
    border-radius: var(--radius-xl);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: -1;
}

.pricing-card:hover {
    transform: translateY(-10px);
    border-color: rgba(59, 130, 246, 0.5);
    box-shadow: var(--shadow-glow-blue);
}

.pricing-card:hover::before {
    opacity: 1;
}

.pricing-card.featured {
    border: 2px solid rgba(59, 130, 246, 0.5);
    background: rgba(59, 130, 246, 0.08);
    box-shadow: var(--shadow-glow-blue);
}

.pricing-card.featured::before {
    opacity: 0.5;
}

.featured-badge {
    position: absolute;
    top: -12px;
    right: var(--spacing-lg);
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 100px;
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.plan-name {
    font-size: var(--font-size-2xl);
    font-weight: 700;
}

.plan-badge {
    background: rgba(16, 185, 129, 0.2);
    color: var(--color-success);
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.plan-badge.special {
    background: rgba(245, 158, 11, 0.2);
    color: var(--color-warning);
    border-color: rgba(245, 158, 11, 0.3);
}

/* Price Comparison */
.price-comparison {
    margin-bottom: var(--spacing-xl);
}

.official-price,
.our-price {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(15, 23, 42, 0.3);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-glass);
}

.price-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.price-value {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    display: flex;
    align-items: baseline;
    gap: 0.25rem;
}

.price-value.strikethrough {
    color: var(--color-text-muted);
    text-decoration: line-through;
    font-size: var(--font-size-xl);
}

.price-value.highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.5));
}

.currency {
    font-size: inherit;
}

.million {
    font-size: var(--font-size-lg);
    margin-left: 0.25rem;
}

.period {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

.price-vnd,
.price-yearly,
.price-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-xs);
}

.savings {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-success);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(16, 185, 129, 0.15);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

/* Features */
.features {
    margin-bottom: var(--spacing-xl);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.feature-item:hover {
    color: var(--color-text-primary);
    transform: translateX(5px);
}

.check-icon {
    flex-shrink: 0;
}

.btn-card {
    width: 100%;
    text-align: center;
    background: var(--gradient-primary);
    color: white;
    padding: 1rem;
    font-weight: 600;
    position: relative;
}

.btn-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-blue);
}

/* Contact Section */
.contact-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, transparent 0%, rgba(59, 130, 246, 0.05) 100%);
}

.contact-content {
    text-align: center;
}

.contact-title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.contact-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
}

.contact-methods {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg) var(--spacing-xl);
    background: rgba(30, 41, 59, 0.4);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--color-border-glass);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--color-text-primary);
    transition: all var(--transition-base);
    min-width: 280px;
    box-shadow: var(--shadow-glass);
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow-blue);
}

.contact-card.zalo:hover {
    border-color: rgba(0, 104, 255, 0.5);
    box-shadow: 0 8px 32px rgba(0, 104, 255, 0.4);
}

.contact-card.telegram:hover {
    border-color: rgba(0, 136, 204, 0.5);
    box-shadow: 0 8px 32px rgba(0, 136, 204, 0.4);
}

.contact-icon {
    flex-shrink: 0;
}

.contact-details {
    text-align: left;
}

.contact-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.contact-value {
    font-size: var(--font-size-lg);
    font-weight: 700;
}

/* Trust Badges */
.trust-badges {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    flex-wrap: wrap;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(59, 130, 246, 0.05);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-glass);
    transition: all var(--transition-base);
}

.trust-item:hover {
    background: rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
}

/* Footer */
.footer {
    padding: var(--spacing-2xl) 0;
    border-top: 1px solid var(--color-border-glass);
    background: rgba(15, 23, 42, 0.3);
    backdrop-filter: blur(20px);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 700;
}

.footer-text {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin-left: auto;
        margin-right: auto;
    }

    .stats {
        gap: var(--spacing-xl);
    }
}

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

    .section-title {
        font-size: var(--font-size-3xl);
    }

    .contact-title {
        font-size: var(--font-size-3xl);
    }

    .stats {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .hero-image {
        margin-top: var(--spacing-2xl);
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .nav-links {
        gap: var(--spacing-md);
    }

    .contact-methods {
        flex-direction: column;
        align-items: center;
    }

    .contact-card {
        width: 100%;
        max-width: 400px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }

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

    .pricing-card {
        padding: var(--spacing-lg);
    }

    .stat-number {
        font-size: var(--font-size-3xl);
    }
}

/* Animations */
@keyframes float {

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

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

.pricing-card {
    animation: fadeInUp 0.6s ease both;
}

.pricing-card:nth-child(1) {
    animation-delay: 0.1s;
}

.pricing-card:nth-child(2) {
    animation-delay: 0.2s;
}

.pricing-card:nth-child(3) {
    animation-delay: 0.3s;
}

/* Floating particles effect */
@keyframes float-particle {

    0%,
    100% {
        transform: translateY(0) translateX(0);
        opacity: 0.3;
    }

    50% {
        transform: translateY(-20px) translateX(10px);
        opacity: 0.6;
    }
}