/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* ChatGPT Theme Colors - Emerald/Teal */
    --primary-color: #10b981; /* emerald-500 */
    --primary-dark: #059669; /* emerald-600 */
    --primary-light: #34d399; /* emerald-400 */
    --secondary-color: #14b8a6; /* teal-500 */
    --secondary-dark: #0f766e; /* teal-600 */
    --secondary-light: #5eead4; /* teal-300 */
    --accent-color: #f59e0b; /* amber-500 */
    
    /* Background Colors - Light Mode */
    --bg-primary: linear-gradient(135deg, #ecfdf5 0%, #f0fdfa 100%); /* emerald-50 to teal-50 */
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-hero: linear-gradient(135deg, #064e3b 0%, #134e4a 100%); /* emerald-900 to teal-800 */
    --bg-section: #f8fafc; /* gray-50 */
    
    /* Text Colors */
    --text-primary: #1f2937; /* gray-800 */
    --text-secondary: #6b7280; /* gray-500 */
    --text-light: #ffffff;
    --text-muted: #9ca3af; /* gray-400 */
    
    /* Border and Shadow */
    --border-color: #e5e7eb; /* gray-200 */
    --border-light: #f3f4f6; /* gray-100 */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: linear-gradient(135deg, #111827 0%, #064e3b 100%); /* gray-900 to emerald-900 */
    --bg-secondary: #1f2937; /* gray-800 */
    --bg-card: #374151; /* gray-700 */
    --bg-hero: linear-gradient(135deg, #000000 0%, #064e3b 100%); /* black to emerald-900 */
    --bg-section: #1f2937; /* gray-800 */
    
    --text-primary: #f9fafb; /* gray-50 */
    --text-secondary: #d1d5db; /* gray-300 */
    --text-muted: #9ca3af; /* gray-400 */
    
    --border-color: #4b5563; /* gray-600 */
    --border-light: #374151; /* gray-700 */
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: var(--transition);
    overflow-x: hidden;
}

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

/* Header Styles */
.header {
    background: var(--bg-secondary);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.top-bar {
    background: var(--bg-hero);
    color: var(--text-light);
    padding: 10px 0;
    font-size: 14px;
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.contact-info {
    display: flex;
    gap: 25px;
    align-items: center;
}

.contact-info a {
    color: var(--text-light);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    opacity: 0.9;
}

.contact-info a:hover {
    opacity: 1;
    color: var(--primary-light);
    transform: translateY(-1px);
}

.contact-info i {
    font-size: 12px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.language-currency {
    display: flex;
    gap: 10px;
}

.language-currency a {
    color: var(--text-light);
    text-decoration: none;
    padding: 6px 12px;
    border-radius: 6px;
    transition: var(--transition);
    font-size: 13px;
    font-weight: 500;
}

.language-currency a:hover {
    background: rgba(255, 255, 255, 0.1);
}

.theme-btn {
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 16px;
    cursor: pointer;
    padding: 10px;
    border-radius: 50%;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.theme-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: scale(1.1);
}

.theme-btn i {
    transition: var(--transition);
}

.user-balance {
    color: var(--text-light);
    font-weight: 600;
    background: rgba(255, 255, 255, 0.1);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
}

.auth-buttons {
    display: flex;
    gap: 12px;
}

.btn-login, .btn-register {
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: var(--text-light);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    font-size: 14px;
}

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

.btn-login:hover, .btn-register:hover {
    background: var(--text-light);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Navigation */
.navbar {
    padding: 20px 0;
    position: relative;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-brand a {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo {
    height: 50px;
    width: auto;
    object-fit: contain;
    border-radius: 8px;
}

.brand-text {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 35px;
    align-items: center;
}

.nav-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition);
    position: relative;
    padding: 8px 0;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.nav-actions {
    display: flex;
    gap: 15px;
}

.btn-primary, .btn-secondary {
    padding: 12px 24px;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    background: var(--bg-hero);
    color: var(--text-light);
    padding: 100px 0;
    position: relative;
    overflow: hidden;
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text .badge {
    background: var(--accent-color);
    color: white;
    padding: 8px 16px;
    border-radius: 25px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    display: inline-block;
    margin-bottom: 25px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.hero-text h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 25px;
    background: linear-gradient(135deg, #ffffff, var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text .highlight {
    color: var(--primary-light);
    text-shadow: 0 0 20px rgba(52, 211, 153, 0.5);
}

.hero-text p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
    line-height: 1.7;
}

.pricing-tabs {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.pricing-tabs .tab {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    flex: 1;
    min-width: 150px;
    backdrop-filter: blur(10px);
}

.pricing-tabs .tab:hover,
.pricing-tabs .tab.active {
    background: rgba(255, 255, 255, 0.2);
    border-color: var(--primary-light);
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.pricing-tabs .tab.popular::before {
    content: 'Phổ biến';
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-color);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 10px;
    font-weight: 700;
}

.pricing-tabs .period {
    display: block;
    font-size: 14px;
    opacity: 0.8;
    margin-bottom: 8px;
    font-weight: 500;
}

.pricing-tabs .price {
    display: block;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-light);
    margin-bottom: 5px;
}

.pricing-tabs .description {
    display: block;
    font-size: 12px;
    color: var(--accent-color);
    font-weight: 500;
}

.hero-actions {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.btn-cta {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 18px 35px;
    border-radius: 15px;
    text-decoration: none;
    font-weight: 700;
    font-size: 16px;
    transition: var(--transition);
    box-shadow: var(--shadow-xl);
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn-cta:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-2xl);
}

.btn-compare {
    background: transparent;
    color: var(--text-light);
    border: 2px solid rgba(255, 255, 255, 0.3);
    padding: 18px 35px;
    border-radius: 15px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn-compare:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-light);
    transform: translateY(-2px);
}

.trust-indicators {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    opacity: 0.9;
}

.trust-item i {
    color: var(--primary-light);
    font-size: 16px;
}

/* Hero Visual */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-image {
    position: relative;
    width: 350px;
    height: 350px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chatgpt-icon {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-2xl);
    animation: float 6s ease-in-out infinite;
    position: relative;
    z-index: 2;
}

.chatgpt-icon i {
    font-size: 80px;
    color: white;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
}

.floating-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    padding: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    animation: floatCard 4s ease-in-out infinite;
}

.floating-card i {
    color: var(--primary-light);
    font-size: 16px;
}

.card-1 {
    top: 20%;
    left: -20%;
    animation-delay: 0s;
}

.card-2 {
    top: 60%;
    right: -20%;
    animation-delay: 1s;
}

.card-3 {
    bottom: 20%;
    left: 10%;
    animation-delay: 2s;
}

@keyframes floatCard {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-15px) rotate(2deg); }
}

/* Activity Feed */
.activity-feed {
    grid-column: 1 / -1;
    margin-top: 60px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 30px;
}

.activity-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.activity-header h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 600;
}

.activity-header i {
    color: var(--primary-light);
}

.live-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-light);
}

.pulse {
    width: 8px;
    height: 8px;
    background: var(--primary-light);
    border-radius: 50%;
    animation: pulse 1.5s infinite;
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-height: 200px;
    overflow-y: auto;
}

.activity-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 14px;
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-item .user {
    font-weight: 600;
    color: var(--primary-light);
}

.activity-item .time {
    opacity: 0.7;
    font-size: 12px;
}

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

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Pricing Section */
.pricing {
    padding: 100px 0;
    background: var(--bg-section);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.pricing-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 40px 30px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    position: relative;
    border: 2px solid transparent;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-color);
}

.pricing-card.popular {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.pricing-card.premium {
    border-color: var(--accent-color);
}

.popular-badge, .premium-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    padding: 8px 20px;
    border-radius: 25px;
    font-size: 12px;
    font-weight: 700;
    color: white;
    display: flex;
    align-items: center;
    gap: 5px;
}

.popular-badge {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.premium-badge {
    background: linear-gradient(135deg, var(--accent-color), #f97316);
}

.discount-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--accent-color);
    color: white;
    padding: 6px 12px;
    border-radius: 15px;
    font-size: 11px;
    font-weight: 700;
}

.pricing-header {
    text-align: center;
    margin-bottom: 30px;
}

.plan-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.plan-icon i {
    font-size: 24px;
    color: white;
}

.pricing-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.price {
    margin-bottom: 10px;
}

.original-price {
    font-size: 16px;
    color: var(--text-muted);
    text-decoration: line-through;
    display: block;
    margin-bottom: 5px;
}

.amount {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
}

.period {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.plan-description {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 10px;
}

.pricing-features {
    margin-bottom: 30px;
}

.pricing-features ul {
    list-style: none;
    padding: 0;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    font-size: 15px;
    color: var(--text-primary);
}

.pricing-features i {
    color: var(--primary-color);
    font-size: 14px;
    width: 16px;
}

.btn-pricing {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 12px;
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-pricing {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.btn-pricing.featured {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    box-shadow: var(--shadow-lg);
}

.btn-pricing.premium {
    background: linear-gradient(135deg, var(--accent-color), #f97316);
}

.btn-pricing:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.feature-card {
    background: var(--bg-card);
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
}

.feature-icon i {
    font-size: 32px;
    color: white;
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Testimonials Section */
.testimonials {
    padding: 100px 0;
    background: var(--bg-section);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.testimonial-card {
    background: var(--bg-card);
    padding: 30px;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.testimonial-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.avatar {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
}

.customer-info h4 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.rating {
    display: flex;
    gap: 2px;
}

.rating i {
    color: var(--accent-color);
    font-size: 14px;
}

.testimonial-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-style: italic;
}

/* FAQ Section */
.faq {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.faq-list {
    max-width: 800px;
    margin: 60px auto 0;
}

.faq-item {
    background: var(--bg-card);
    border-radius: 15px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-question {
    padding: 25px 30px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--bg-section);
}

.faq-question h4 {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 16px;
}

.faq-question i {
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 30px 25px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--bg-hero);
    color: var(--text-light);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

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

.footer-logo {
    height: 40px;
    width: auto;
    margin-bottom: 15px;
}

.footer-brand h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--primary-light);
}

.footer-brand p {
    opacity: 0.8;
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

.footer-section h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--primary-light);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 10px;
}

.footer-section a {
    color: var(--text-light);
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition);
}

.footer-section a:hover {
    opacity: 1;
    color: var(--primary-light);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    opacity: 0.8;
}

.contact-item i {
    color: var(--primary-light);
    width: 16px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-links {
    display: flex;
    gap: 25px;
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--primary-light);
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: var(--bg-card);
    margin: 5% auto;
    border-radius: 20px;
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-2xl);
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 30px 30px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.tab-buttons {
    display: flex;
    gap: 5px;
    background: var(--bg-section);
    padding: 5px;
    border-radius: 10px;
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    color: var(--text-secondary);
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
}

.close-btn {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    padding: 5px;
    border-radius: 50%;
}

.close-btn:hover {
    color: var(--text-primary);
    background: var(--bg-section);
}

.modal-body {
    padding: 30px;
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 14px;
    transition: var(--transition);
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.btn-submit {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 10px;
    font-weight: 700;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Topup Modal */
.amount-selection h4 {
    margin-bottom: 20px;
    color: var(--text-primary);
    font-weight: 600;
}

.amount-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 25px;
}

.amount-btn {
    padding: 15px;
    border: 2px solid var(--border-color);
    background: var(--bg-secondary);
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    color: var(--text-primary);
}

.amount-btn:hover,
.amount-btn.selected {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
}

.qr-payment {
    text-align: center;
}

.qr-container {
    margin: 30px 0;
    display: flex;
    justify-content: center;
}

.qr-container img {
    max-width: 250px;
    border-radius: 15px;
    box-shadow: var(--shadow-md);
}

.payment-info {
    background: var(--bg-section);
    padding: 20px;
    border-radius: 15px;
    margin: 20px 0;
    text-align: left;
}

.info-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 14px;
}

.info-item strong {
    color: var(--text-primary);
}

.payment-note {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid var(--accent-color);
    border-radius: 10px;
    padding: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
}

.payment-note i {
    color: var(--accent-color);
    font-size: 16px;
}

.payment-note p {
    margin: 0;
    font-size: 14px;
    color: var(--text-secondary);
}

/* Chat Widget */
.chat-widget {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 9999;
}

.chat-toggle {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-xl);
    transition: var(--transition);
    position: relative;
}

.chat-toggle:hover {
    transform: scale(1.1);
}

.chat-toggle i {
    color: white;
    font-size: 24px;
}

.chat-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--accent-color);
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
}

.chat-window {
    position: absolute;
    bottom: 80px;
    right: 0;
    width: 350px;
    height: 500px;
    background: var(--bg-card);
    border-radius: 20px;
    box-shadow: var(--shadow-2xl);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h4 {
    font-weight: 600;
    margin: 0;
}

.chat-close {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 16px;
    padding: 5px;
    border-radius: 50%;
    transition: var(--transition);
}

.chat-close:hover {
    background: rgba(255, 255, 255, 0.1);
}

.chat-messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.message-content {
    background: var(--bg-section);
    padding: 12px 15px;
    border-radius: 15px;
    max-width: 80%;
    font-size: 14px;
    line-height: 1.4;
}

.bot-message .message-content {
    background: var(--primary-color);
    color: white;
}

.chat-quick-replies {
    padding: 15px 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    border-top: 1px solid var(--border-color);
}

.quick-reply {
    padding: 8px 12px;
    background: var(--bg-section);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    cursor: pointer;
    font-size: 12px;
    transition: var(--transition);
    color: var(--text-primary);
}

.quick-reply:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.chat-input {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 10px;
}

.chat-input input {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 25px;
    font-size: 14px;
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.chat-input input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.chat-input button {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    transition: var(--transition);
}

.chat-input button:hover {
    background: var(--primary-dark);
}

/* Notification */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10001;
    background: var(--bg-card);
    border-radius: 10px;
    box-shadow: var(--shadow-xl);
    padding: 15px 20px;
    display: none;
    align-items: center;
    gap: 10px;
    min-width: 300px;
    border-left: 4px solid var(--primary-color);
}

.notification.success {
    border-left-color: var(--primary-color);
}

.notification.error {
    border-left-color: #ef4444;
}

.notification.warning {
    border-left-color: var(--accent-color);
}

.notification.info {
    border-left-color: #3b82f6;
}

.notification-icon {
    font-size: 18px;
}

.notification.success .notification-icon {
    color: var(--primary-color);
}

.notification.error .notification-icon {
    color: #ef4444;
}

.notification.warning .notification-icon {
    color: var(--accent-color);
}

.notification.info .notification-icon {
    color: #3b82f6;
}

.notification-text {
    color: var(--text-primary);
    font-weight: 500;
}

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 60px;
        text-align: center;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .hero-image {
        width: 300px;
        height: 300px;
    }
    
    .chatgpt-icon {
        width: 150px;
        height: 150px;
    }
    
    .chatgpt-icon i {
        font-size: 60px;
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-card);
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        border-radius: 0 0 15px 15px;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-actions {
        display: none;
    }
    
    .hero-text h1 {
        font-size: 2.5rem;
    }
    
    .pricing-tabs {
        flex-direction: column;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .trust-indicators {
        justify-content: center;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .pricing-card.popular {
        transform: none;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .chat-window {
        width: 300px;
        height: 450px;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
    }
    
    .amount-buttons {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 60px 0;
    }
    
    .hero-text h1 {
        font-size: 2rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .pricing {
        padding: 60px 0;
    }
    
    .features {
        padding: 60px 0;
    }
    
    .testimonials {
        padding: 60px 0;
    }
    
    .faq {
        padding: 60px 0;
    }
    
    .chat-widget {
        bottom: 20px;
        right: 20px;
    }
    
    .chat-toggle {
        width: 50px;
        height: 50px;
    }
    
    .chat-toggle i {
        font-size: 20px;
    }
    
    .chat-window {
        width: calc(100vw - 40px);
        height: 400px;
        right: -15px;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

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

.text-right {
    text-align: right;
}

.hidden {
    display: none;
}

.visible {
    display: block;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-section);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Selection Styling */
::selection {
    background: var(--primary-color);
    color: white;
}

::-moz-selection {
    background: var(--primary-color);
    color: white;
}

/* Focus Styling */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .header,
    .chat-widget,
    .modal,
    .notification {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #000000;
        --text-primary: #000000;
        --text-secondary: #333333;
        --bg-card: #ffffff;
        --border-color: #000000;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}