/* ===== CSS VARIABLES - VIBRANT COLOR SCHEME ===== */
        :root {
            /* Vibrant Pink Palette */
            --color-primary: #E91E63;
            --color-primary-dark: #AD1457;
            --color-primary-light: #FF4081;
            --color-primary-lighter: #F8BBD9;
            --color-primary-subtle: #FCE4EC;
            
            /* Vibrant Secondary Colors */
            --color-secondary: #FF4081;
            --color-accent: #E91E63;
            --color-accent-light: #F8BBD9;
            
            /* Professional Neutral Palette */
            --color-white: #FFFFFF;
            --color-cream: #FEFEFE;
            --color-gray-25: #FCFCFC;
            --color-gray-50: #F9F9FB;
            --color-gray-100: #F4F4F6;
            --color-gray-200: #E8E8EC;
            --color-gray-300: #D1D1D8;
            --color-gray-400: #9999A1;
            --color-gray-500: #68697A;
            --color-gray-600: #4B4C63;
            --color-gray-700: #3C3D56;
            --color-gray-800: #2E2F42;
            --color-gray-900: #1F1F2E;
            --color-charcoal: #191A28;
            
            /* Vibrant Status Colors */
            --color-success: #4CAF50;
            --color-warning: #FF9800;
            --color-error: #F44336;
            --color-info: #2196F3;
            
            /* Vibrant Gradients */
            --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
            --gradient-subtle: linear-gradient(135deg, var(--color-primary-subtle) 0%, var(--color-white) 100%);
            --gradient-hero: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 50%, var(--color-secondary) 100%);
            --gradient-soft: linear-gradient(180deg, var(--color-primary-lighter) 0%, rgba(255, 64, 129, 0.3) 100%);
            --gradient-minimal: linear-gradient(135deg, rgba(233, 30, 99, 0.08) 0%, rgba(255, 64, 129, 0.05) 100%);
            --gradient-vibrant: linear-gradient(45deg, #E91E63, #FF4081, #E91E63);
            
            /* Enhanced Shadows with Pink Tint */
            --shadow-xs: 0 1px 2px 0 rgba(233, 30, 99, 0.04);
            --shadow-sm: 0 1px 3px 0 rgba(233, 30, 99, 0.08), 0 1px 2px 0 rgba(233, 30, 99, 0.04);
            --shadow-md: 0 4px 6px -1px rgba(233, 30, 99, 0.1), 0 2px 4px -1px rgba(233, 30, 99, 0.06);
            --shadow-lg: 0 10px 15px -3px rgba(233, 30, 99, 0.1), 0 4px 6px -2px rgba(233, 30, 99, 0.05);
            --shadow-xl: 0 20px 25px -5px rgba(233, 30, 99, 0.1), 0 10px 10px -5px rgba(233, 30, 99, 0.04);
            --shadow-2xl: 0 25px 50px -12px rgba(233, 30, 99, 0.2);
            --shadow-soft: 0 8px 32px 0 rgba(233, 30, 99, 0.15);
            --shadow-glow: 0 0 20px rgba(233, 30, 99, 0.3);
            
            /* Enhanced Typography */
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            --font-weight-thin: 100;
            --font-weight-extralight: 200;
            --font-weight-light: 300;
            --font-weight-normal: 400;
            --font-weight-medium: 500;
            --font-weight-semibold: 600;
            --font-weight-bold: 700;
            --font-weight-extrabold: 800;
            --font-weight-black: 900;
            
            /* Professional Spacing */
            --spacing-xs: 0.375rem;
            --spacing-sm: 0.75rem;
            --spacing-md: 1.25rem;
            --spacing-lg: 2rem;
            --spacing-xl: 3rem;
            --spacing-2xl: 4rem;
            --spacing-3xl: 6rem;
            --spacing-4xl: 8rem;
            
            /* Modern Border Radius */
            --radius-xs: 0.25rem;
            --radius-sm: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.5rem;
            --radius-2xl: 2rem;
            --radius-3xl: 3rem;
            --radius-full: 9999px;
            
            /* Smooth Transitions */
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
        }

        /* ===== RESET & BASE STYLES ===== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            overflow-x: hidden;
        }

        body {
            font-family: var(--font-family);
            line-height: 1.7;
            color: var(--color-gray-700);
            background-color: var(--color-white);
            overflow-x: hidden;
            font-weight: var(--font-weight-normal);
            letter-spacing: -0.01em;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

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

        button {
            border: none;
            background: none;
            cursor: pointer;
            font-family: inherit;
        }

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

        @media (min-width: 768px) {
            .container {
                padding: 0 var(--spacing-xl);
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding: 0 var(--spacing-2xl);
            }
        }

        .text-gradient {
            background: var(--gradient-primary);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: var(--font-weight-semibold);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: var(--spacing-sm);
            padding: var(--spacing-md) var(--spacing-xl);
            border-radius: var(--radius-full);
            font-weight: var(--font-weight-medium);
            font-size: 0.95rem;
            line-height: 1.2;
            transition: all var(--transition-normal);
            cursor: pointer;
            border: none;
            text-decoration: none;
            letter-spacing: -0.01em;
            backdrop-filter: blur(8px);
            position: relative;
            overflow: hidden;
        }

        .btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
            transition: left var(--transition-normal);
        }

        .btn:hover::before {
            left: 100%;
        }

        .btn-primary {
            background: var(--gradient-primary);
            color: var(--color-white);
            box-shadow: var(--shadow-lg);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-glow);
            filter: brightness(1.1);
        }

        .btn-secondary {
            background: var(--color-white);
            color: var(--color-primary);
            border: 1.5px solid var(--color-primary-light);
            box-shadow: var(--shadow-sm);
        }

        .btn-secondary:hover {
            background: var(--gradient-subtle);
            color: var(--color-primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            border-color: var(--color-primary);
        }

        .btn-ghost {
            background: rgba(255, 255, 255, 0.15);
            color: var(--color-white);
            border: 1px solid rgba(255, 255, 255, 0.25);
            backdrop-filter: blur(20px);
        }

        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.25);
            border-color: rgba(255, 255, 255, 0.4);
            transform: translateY(-2px);
        }

        /* ===== COOKIE CONSENT BANNER ===== */
        .cookie-banner {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: var(--color-white);
            border-top: 1px solid var(--color-gray-200);
            box-shadow: var(--shadow-lg);
            padding: var(--spacing-lg);
            z-index: 9999;
            transform: translateY(100%);
            transition: transform var(--transition-normal);
        }

        .cookie-banner.show {
            transform: translateY(0);
        }

        .cookie-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-lg);
            flex-wrap: wrap;
        }

        .cookie-text {
            flex: 1;
            min-width: 300px;
            font-size: 0.9rem;
            color: var(--color-gray-600);
        }

        .cookie-buttons {
            display: flex;
            gap: var(--spacing-sm);
        }

        /* ===== BACK TO TOP BUTTON ===== */
        .back-to-top {
            position: fixed;
            bottom: var(--spacing-lg);
            right: var(--spacing-lg);
            width: 50px;
            height: 50px;
            background: var(--gradient-primary);
            color: var(--color-white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: var(--shadow-lg);
            cursor: pointer;
            transition: all var(--transition-normal);
            opacity: 0;
            visibility: hidden;
            z-index: 1000;
        }

        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-glow);
        }

        /* ===== TOAST NOTIFICATIONS ===== */
        .toast-container {
            position: fixed;
            top: var(--spacing-lg);
            right: var(--spacing-lg);
            z-index: 9999;
        }

        .toast {
            background: var(--color-white);
            border: 1px solid var(--color-gray-200);
            border-left: 4px solid var(--color-primary);
            border-radius: var(--radius-md);
            padding: var(--spacing-md);
            box-shadow: var(--shadow-lg);
            margin-bottom: var(--spacing-sm);
            transform: translateX(400px);
            transition: transform var(--transition-normal);
            max-width: 300px;
        }

        .toast.show {
            transform: translateX(0);
        }

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

        .toast.error {
            border-left-color: var(--color-error);
        }

        /* ===== IMPROVED HEADER ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(20px) saturate(180%);
            border-bottom: 1px solid rgba(233, 30, 99, 0.08);
            transition: all var(--transition-normal);
            padding: 0;
        }

        .header.scrolled {
            background: rgba(255, 255, 255, 0.98);
            box-shadow: var(--shadow-md);
            border-bottom-color: rgba(233, 30, 99, 0.12);
        }

        .header-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 80px;
            padding: 0 var(--spacing-lg);
        }

        @media (min-width: 768px) {
            .header-content {
                padding: 0 var(--spacing-xl);
            }
        }

        @media (min-width: 1024px) {
            .header-content {
                padding: 0 var(--spacing-2xl);
            }
        }

        .logo {
            display: flex;
            align-items: center;
            gap: var(--spacing-md);
            font-size: 1.5rem;
            font-weight: var(--font-weight-bold);
            color: var(--color-primary);
            letter-spacing: -0.02em;
        }

        .logo-icon {
            width: 120px;
            height: 48px;
            border-radius: var(--radius-xl);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-white);
            font-size: 1.2rem;
            box-shadow: var(--shadow-md);
        }

        .nav {
            display: none;
            gap: var(--spacing-2xl);
        }

        @media (min-width: 1024px) {
            .nav {
                display: flex;
            }
        }

        .nav-link {
            font-weight: var(--font-weight-medium);
            color: var(--color-gray-600);
            transition: all var(--transition-normal);
            position: relative;
            font-size: 1rem;
            letter-spacing: -0.01em;
            padding: var(--spacing-sm) 0;
        }

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

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            right: 50%;
            height: 2px;
            background: var(--gradient-primary);
            border-radius: var(--radius-full);
            transition: all var(--transition-normal);
        }

        .nav-link:hover::after {
            left: 0;
            right: 0;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: var(--spacing-lg);
        }

        /* ===== IMPROVED LANGUAGE DROPDOWN ===== */
        .language-dropdown {
            position: relative;
        }

        .language-trigger {
            display: flex;
            align-items: center;
            gap: var(--spacing-xs);
            padding: var(--spacing-sm) var(--spacing-md);
            background: var(--color-gray-50);
            border: 1.5px solid var(--color-gray-200);
            border-radius: var(--radius-lg);
            font-size: 0.9rem;
            font-weight: var(--font-weight-medium);
            color: var(--color-gray-700);
            cursor: pointer;
            transition: all var(--transition-normal);
            min-width: 80px;
            justify-content: center;
        }

        .language-trigger:hover {
            background: var(--color-white);
            border-color: var(--color-primary-light);
            color: var(--color-primary);
        }
        .language-dropdown-menu {
            position: absolute;
            top: 100%;
            right: 0;
            margin-top: var(--spacing-xs);
            background: var(--color-white);
            border: 1.5px solid var(--color-gray-200);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            opacity: 0;
            visibility: hidden;
            transform: translateY(-10px);
            transition: all var(--transition-normal);
            min-width: 120px; /* Hoặc giá trị phù hợp hơn, ví dụ 150px hay 180px tùy tên ngôn ngữ */
            z-index: 100;
            max-height: 70vh; /* Giới hạn chiều cao tối đa, ví dụ 70% chiều cao viewport */
            overflow-y: auto; /* Hiển thị thanh cuộn dọc khi nội dung vượt quá max-height */
        }

        .language-dropdown.active .language-dropdown-menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .language-option {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            padding: var(--spacing-sm) var(--spacing-md);
            font-size: 0.9rem;
            font-weight: var(--font-weight-medium);
            color: var(--color-gray-700);
            cursor: pointer;
            transition: all var(--transition-fast);
            border-radius: var(--radius-md);
            margin: 2px;
        }

        .language-option:hover {
            background: var(--color-gray-50);
            color: var(--color-primary);
        }

        .language-option.active {
            background: var(--gradient-subtle);
            color: var(--color-primary);
        }

        .flag {
            width: 20px;
            height: 20px;
            border-radius: var(--radius-xs);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
        }

        /* ===== MOBILE MENU ===== */
        .mobile-menu-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            color: var(--color-primary);
            font-size: 1.6rem;
            border-radius: var(--radius-lg);
            background: var(--color-gray-50);
            border: 1.5px solid var(--color-gray-200);
            transition: all var(--transition-normal);
        }

        .mobile-menu-btn:hover {
            background: var(--color-white);
            border-color: var(--color-primary-light);
        }

        @media (min-width: 1024px) {
            .mobile-menu-btn {
                display: none;
            }
        }

        .mobile-menu {
            position: fixed;
            top: 80px;
            left: 0;
            right: 0;
            background: var(--color-white);
            border-bottom: 1px solid var(--color-gray-200);
            box-shadow: var(--shadow-lg);
            opacity: 0;
            visibility: hidden;
            transform: translateY(-20px);
            transition: all var(--transition-normal);
            z-index: 999;
        }

        .mobile-menu.active {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .mobile-nav {
            display: flex;
            flex-direction: column;
            padding: var(--spacing-lg);
            gap: var(--spacing-sm);
        }

        .mobile-nav-link {
            padding: var(--spacing-md);
            color: var(--color-gray-700);
            font-weight: var(--font-weight-medium);
            font-size: 1.1rem;
            border-radius: var(--radius-lg);
            transition: all var(--transition-normal);
        }

        .mobile-nav-link:hover {
            background: var(--color-gray-50);
            color: var(--color-primary);
        }

        .mobile-nav-cta {
            margin-top: var(--spacing-md);
            padding-top: var(--spacing-md);
            border-top: 1px solid var(--color-gray-200);
        }

        /* ===== HERO SECTION ===== */
        .hero {
            background: var(--gradient-hero);
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            padding-top: 80px;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url("data:image/svg+xml,%3Csvg width='120' height='120' viewBox='0 0 120 120' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Ccircle cx='12' cy='12' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
            animation: float 30s ease-in-out infinite;
        }

        .hero::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
                        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
                        radial-gradient(circle at 40% 80%, rgba(255, 255, 255, 0.06) 0%, transparent 50%);
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px) rotate(0deg); }
            33% { transform: translateY(-10px) rotate(60deg); }
            66% { transform: translateY(5px) rotate(120deg); }
        }

        .hero-content {
            display: grid;
            grid-template-columns: 1fr;
            gap: var(--spacing-4xl);
            align-items: center;
            position: relative;
            z-index: 3;
            padding: var(--spacing-4xl) 0;
        }

        @media (min-width: 1024px) {
            .hero-content {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-3xl);
            }
        }

        .hero-text {
            text-align: center;
            color: var(--color-white);
        }

        @media (min-width: 1024px) {
            .hero-text {
                text-align: left;
            }
        }

        .hero-title {
            font-size: clamp(2.5rem, 5vw, 4.5rem);
            font-weight: var(--font-weight-bold);
            line-height: 1.15;
            margin-bottom: var(--spacing-lg);
            letter-spacing: -0.025em;
        }

        .hero-subtitle {
            font-size: 1.125rem;
            font-weight: var(--font-weight-normal);
            margin-bottom: var(--spacing-2xl);
            opacity: 0.92;
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.7;
            letter-spacing: -0.01em;
        }

        @media (min-width: 1024px) {
            .hero-subtitle {
                margin-left: 0;
                margin-right: 0;
                font-size: 1.2rem;
            }
        }

        .hero-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-md);
            justify-content: center;
            margin-bottom: var(--spacing-2xl);
        }

        @media (min-width: 1024px) {
            .hero-buttons {
                justify-content: flex-start;
            }
        }

        .hero-stats {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: var(--spacing-lg);
            flex-wrap: wrap;
        }

        @media (min-width: 1024px) {
            .hero-stats {
                justify-content: flex-start;
            }
        }

        .hero-rating {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            font-size: 0.95rem;
            font-weight: var(--font-weight-medium);
        }

        .stars {
            display: flex;
            color: #FFD93D;
            filter: drop-shadow(0 2px 4px rgba(255, 217, 61, 0.2));
        }

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

        .phone-mockup {
            width: 300px;
            height: 600px;
            background: linear-gradient(145deg, #2a2a2a, #1a1a1a);
            border-radius: 48px;
            padding: 12px;
            box-shadow: var(--shadow-2xl), 
                        inset 0 1px 0 rgba(255, 255, 255, 0.1);
            position: relative;
            transform: rotate(-3deg);
            transition: all var(--transition-slow);
        }

        .phone-mockup:hover {
            transform: rotate(0deg) scale(1.02);
        }

        .phone-mockup::before {
            content: '';
            position: absolute;
            top: -20px;
            left: -20px;
            right: -20px;
            bottom: -20px;
            background: radial-gradient(circle at center, rgba(233, 30, 99, 0.2) 0%, transparent 70%);
            border-radius: inherit;
            z-index: -1;
            opacity: 0;
            transition: opacity var(--transition-slow);
        }

        .phone-mockup:hover::before {
            opacity: 1;
        }

        .phone-screen {
            width: 100%;
            height: 100%;
            background: var(--gradient-primary);
            border-radius: 36px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            color: var(--color-white);
            position: relative;
            overflow: hidden;
        }

        .phone-bg-pattern {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            opacity: 0.08;
            background: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23ffffff' fill-opacity='0.4'%3E%3Cpath d='M20 20c0-5.5-4.5-10-10-10s-10 4.5-10 10 4.5 10 10 10 10-4.5 10-10z'/%3E%3C/g%3E%3C/svg%3E") repeat;
        }

        .phone-content {
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .phone-icon {
            font-size: 4.5rem;
            margin-bottom: var(--spacing-lg);
            animation: pulse 3s ease-in-out infinite;
            filter: drop-shadow(0 4px 8px rgba(255, 255, 255, 0.2));
        }

        @keyframes pulse {
            0%, 100% { 
                transform: scale(1); 
                opacity: 1;
            }
            50% { 
                transform: scale(1.08); 
                opacity: 0.9;
            }
        }

        .phone-title {
            font-size: 1.6rem;
            font-weight: var(--font-weight-semibold);
            margin-bottom: var(--spacing-sm);
            letter-spacing: -0.02em;
        }

        .phone-subtitle {
            font-size: 1rem;
            opacity: 0.85;
            margin-bottom: var(--spacing-xl);
            font-weight: var(--font-weight-normal);
        }

        .phone-controls {
            display: flex;
            gap: var(--spacing-sm);
            justify-content: center;
            align-items: center;
        }

        .control-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.4);
            transition: all var(--transition-normal);
        }

        .control-dot.active {
            background: var(--color-white);
            width: 28px;
            border-radius: 14px;
            box-shadow: 0 2px 8px rgba(255, 255, 255, 0.3);
        }


       

        /* ===== STATS SECTION ===== */
        .stats {
            padding: var(--spacing-4xl) 0;
            background: var(--gradient-minimal);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: var(--spacing-xl);
            text-align: center;
        }

        .stat-item {
            background: var(--color-white);
            padding: var(--spacing-2xl) var(--spacing-lg);
            border-radius: var(--radius-2xl);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--color-gray-200);
            transition: all var(--transition-normal);
            position: relative;
            overflow: hidden;
        }

        .stat-item::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: var(--gradient-subtle);
            transition: left var(--transition-slow);
            z-index: 1;
        }

        .stat-item:hover::before {
            left: 0;
        }

        .stat-item:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-soft);
            border-color: var(--color-primary-light);
        }

        .stat-item > * {
            position: relative;
            z-index: 2;
        }

        .stat-number {
            font-size: 3.5rem;
            font-weight: var(--font-weight-bold);
            margin-bottom: var(--spacing-sm);
            line-height: 1;
            letter-spacing: -0.02em;
        }

        .stat-label {
            font-size: 1.125rem;
            font-weight: var(--font-weight-medium);
            color: var(--color-gray-600);
            letter-spacing: -0.01em;
        }

        /* ===== SCREENSHOT CAROUSEL WITH IMAGES ===== */
        .screenshot-section {
            padding: var(--spacing-4xl) 0;
            background: var(--color-gray-900);
            color: var(--color-white);
            overflow: hidden;
        }

        .screenshot-carousel {
            display: flex;
            gap: var(--spacing-lg);
            animation: slide 25s infinite linear;
            width: calc(280px * 10);
        }

        @keyframes slide {
            0% { transform: translateX(0); }
            100% { transform: translateX(calc(-280px * 5)); }
        }

        .screenshot-item {
            width: 280px;
            height: 560px;
            background: linear-gradient(145deg, #2a2a2a, #1a1a1a);
            border-radius: 40px;
            padding: 10px;
            flex-shrink: 0;
            position: relative;
        }

        .screenshot-screen {
            width: 100%;
            height: 100%;
            border-radius: 30px;
            overflow: hidden;
            position: relative;
        }

        .screenshot-image {
            width: 100%;
            height: 100%;
            object-fit: cover;
            background: var(--gradient-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-white);
            font-size: 1.1rem;
            font-weight: var(--font-weight-semibold);
        }

        /* ===== FEATURES SECTION ===== */
        .features {
            padding: var(--spacing-4xl) 0;
            background: var(--color-white);
        }

        .section-header {
            text-align: center;
            margin-bottom: var(--spacing-4xl);
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }

        .section-title {
            font-size: clamp(2rem, 4vw, 3.5rem);
            font-weight: var(--font-weight-bold);
            margin-bottom: var(--spacing-lg);
            color: var(--color-gray-800);
            line-height: 1.2;
            letter-spacing: -0.025em;
        }

        .section-subtitle {
            font-size: 1.2rem;
            color: var(--color-gray-600);
            max-width: 650px;
            margin: 0 auto;
            line-height: 1.7;
            font-weight: var(--font-weight-normal);
            letter-spacing: -0.01em;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: var(--spacing-2xl);
        }

        .feature-card {
            background: var(--color-white);
            padding: var(--spacing-2xl);
            border-radius: var(--radius-2xl);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--color-gray-200);
            text-align: center;
            transition: all var(--transition-normal);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--gradient-subtle);
            opacity: 0;
            transition: opacity var(--transition-normal);
            z-index: 1;
        }

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

        .feature-card:hover {
            transform: translateY(-12px);
            box-shadow: var(--shadow-soft);
            border-color: var(--color-primary-light);
        }

        .feature-card > * {
            position: relative;
            z-index: 2;
        }

        .feature-icon {
            width: 88px;
            height: 88px;
            margin: 0 auto var(--spacing-xl);
            background: var(--gradient-primary);
            border-radius: var(--radius-2xl);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-white);
            font-size: 2.2rem;
            box-shadow: var(--shadow-lg);
            transition: all var(--transition-normal);
        }

        .feature-card:hover .feature-icon {
            transform: scale(1.05);
            box-shadow: var(--shadow-glow);
        }

        .feature-title {
            font-size: 1.5rem;
            font-weight: var(--font-weight-semibold);
            margin-bottom: var(--spacing-md);
            color: var(--color-gray-800);
            letter-spacing: -0.01em;
        }

        .feature-description {
            color: var(--color-gray-600);
            line-height: 1.7;
            font-size: 1rem;
            letter-spacing: -0.005em;
        }

        /* ===== FAQ SECTION ===== */
        .faq {
            padding: var(--spacing-4xl) 0;
            background: var(--color-gray-50);
        }

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

        .faq-item {
            background: var(--color-white);
            border-radius: var(--radius-lg);
            margin-bottom: var(--spacing-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-gray-200);
            overflow: hidden;
        }

        .faq-question {
            padding: var(--spacing-lg);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: var(--font-weight-semibold);
            color: var(--color-gray-800);
            transition: all var(--transition-normal);
        }

        .faq-question:hover {
            color: var(--color-primary);
            background: var(--color-gray-50);
        }

        .faq-icon {
            transition: transform var(--transition-normal);
        }

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

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

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

        .faq-answer-content {
            padding: 0 var(--spacing-lg) var(--spacing-lg);
            color: var(--color-gray-600);
            line-height: 1.7;
        }

        /* ===== IMPROVED TESTIMONIALS SLIDER ===== */
        .testimonials {
            padding: var(--spacing-4xl) 0;
            background: var(--color-gray-900);
            color: var(--color-white);
            position: relative;
            overflow: hidden;
        }

        .testimonials::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Ccircle cx='8' cy='8' r='1'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
        }

        .testimonials .section-title {
            color: var(--color-white);
        }

        .testimonials .section-subtitle {
            color: var(--color-gray-300);
        }

        .testimonials-slider {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }

        .testimonials-container {
            overflow: hidden;
            position: relative;
            margin: 0 -var(--spacing-lg);
            padding: 0 var(--spacing-lg);
        }

        .testimonials-track {
            display: flex;
            transition: transform 0.5s ease-in-out;
            gap: var(--spacing-lg);
        }

        .testimonial-card {
            min-width: calc(100% - var(--spacing-lg));
            max-width: 500px;
            background: rgba(255, 255, 255, 0.08);
            padding: var(--spacing-2xl);
            border-radius: var(--radius-2xl);
            border: 1px solid rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(20px) saturate(180%);
            transition: all var(--transition-normal);
            flex-shrink: 0;
            box-sizing: border-box;
        }

        @media (min-width: 768px) {
            .testimonial-card {
                min-width: calc(50% - var(--spacing-lg)/2);
            }
        }

        @media (min-width: 1024px) {
            .testimonial-card {
                min-width: calc(33.333% - var(--spacing-lg)*2/3);
            }
        }

        .testimonial-card:hover {
            transform: translateY(-8px);
            background: rgba(255, 255, 255, 0.12);
            border-color: rgba(255, 255, 255, 0.2);
            box-shadow: var(--shadow-soft);
        }

        .testimonial-content {
            font-size: 1rem;
            line-height: 1.6;
            margin-bottom: var(--spacing-lg);
            font-style: italic;
            font-weight: var(--font-weight-normal);
            letter-spacing: -0.01em;
            color: var(--color-gray-100);
            display: -webkit-box;
            -webkit-line-clamp: 4;
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        @media (min-width: 768px) {
            .testimonial-content {
                font-size: 1.05rem;
                line-height: 1.65;
            }
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: var(--spacing-md);
        }

        .author-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--gradient-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: var(--font-weight-semibold);
            font-size: 1.2rem;
            box-shadow: var(--shadow-md);
            flex-shrink: 0;
        }

        .author-info {
            min-width: 0;
            flex: 1;
        }

        .author-info h4 {
            font-weight: var(--font-weight-semibold);
            margin-bottom: 2px;
            font-size: 1rem;
            color: var(--color-white);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .author-info p {
            color: var(--color-gray-400);
            font-size: 0.85rem;
            font-weight: var(--font-weight-normal);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .testimonials-controls {
            display: flex;
            justify-content: center;
            gap: var(--spacing-md);
            margin-top: var(--spacing-2xl);
        }

        .testimonial-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: var(--color-white);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            cursor: pointer;
            transition: all var(--transition-normal);
        }

        .testimonial-btn:hover {
            background: rgba(255, 255, 255, 0.2);
            border-color: rgba(255, 255, 255, 0.3);
            transform: scale(1.05);
        }

        .testimonials-dots {
            display: flex;
            justify-content: center;
            gap: var(--spacing-sm);
            margin-top: var(--spacing-lg);
        }

        .testimonial-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.3);
            cursor: pointer;
            transition: all var(--transition-normal);
        }

        .testimonial-dot.active {
            background: var(--color-white);
            transform: scale(1.2);
        }

        /* ===== SOCIAL PROOF SECTION ===== */
        .social-proof {
            padding: var(--spacing-2xl) 0;
            background: var(--color-white);
            border-top: 1px solid var(--color-gray-200);
            border-bottom: 1px solid var(--color-gray-200);
        }

        .awards-grid {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: var(--spacing-2xl);
            flex-wrap: wrap;
        }

        .award-badge {
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
            padding: var(--spacing-sm) var(--spacing-md);
            background: var(--color-gray-50);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-gray-200);
            font-size: 0.9rem;
            color: var(--color-gray-600);
            font-weight: var(--font-weight-medium);
        }

        .award-icon {
            font-size: 1.2rem;
            color: var(--color-primary);
        }

        /* ===== CTA SECTION ===== */
        .cta {
            padding: var(--spacing-4xl) 0;
            background: var(--gradient-primary);
            color: var(--color-white);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(circle at 30% 40%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
                        radial-gradient(circle at 80% 10%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
                        radial-gradient(circle at 40% 80%, rgba(255, 255, 255, 0.06) 0%, transparent 50%);
        }

        .cta > .container > * {
            position: relative;
            z-index: 2;
        }

        .cta-title {
            font-size: clamp(2rem, 4vw, 3.5rem);
            font-weight: var(--font-weight-bold);
            margin-bottom: var(--spacing-lg);
            line-height: 1.2;
            letter-spacing: -0.02em;
        }

        .cta-subtitle {
            font-size: 1.2rem;
            margin-bottom: var(--spacing-2xl);
            opacity: 0.92;
            font-weight: var(--font-weight-normal);
            letter-spacing: -0.01em;
        }

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

        .cta-single {
            margin: 0 auto;
        }

        .app-store-btn {
            display: flex;
            align-items: center;
            gap: var(--spacing-md);
            padding: var(--spacing-sm) var(--spacing-2xl);
            background: rgba(255, 255, 255, 0.95);
            color: var(--color-gray-800);
            border-radius: var(--radius-xl);
            font-weight: var(--font-weight-semibold);
            transition: all var(--transition-normal);
            box-shadow: var(--shadow-lg);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        .app-store-btn:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-soft);
            background: var(--color-white);
        }

        .app-store-btn i {
            font-size: 1.75rem;
        }

        .cta-features {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: var(--spacing-xl);
            font-size: 1rem;
            opacity: 0.9;
            font-weight: var(--font-weight-medium);
        }

        /* ===== NEWSLETTER SECTION ===== */
        .newsletter {
            padding: var(--spacing-2xl) 0;
            background: var(--color-gray-900);
            color: var(--color-white);
        }

        .newsletter-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-2xl);
            flex-wrap: wrap;
        }

        .newsletter-text h3 {
            font-size: 1.5rem;
            font-weight: var(--font-weight-semibold);
            margin-bottom: var(--spacing-xs);
        }

        .newsletter-text p {
            color: var(--color-gray-300);
            font-size: 0.95rem;
        }

        .newsletter-form {
            display: flex;
            gap: var(--spacing-sm);
            min-width: 300px;
        }

        .newsletter-input {
            flex: 1;
            padding: var(--spacing-md);
            border: 1px solid var(--color-gray-600);
            border-radius: var(--radius-lg);
            background: var(--color-gray-800);
            color: var(--color-white);
            font-size: 0.95rem;
        }

        .newsletter-input::placeholder {
            color: var(--color-gray-400);
        }

        .newsletter-btn {
            padding: var(--spacing-md) var(--spacing-lg);
            background: var(--gradient-primary);
            color: var(--color-white);
            border: none;
            border-radius: var(--radius-lg);
            font-weight: var(--font-weight-medium);
            cursor: pointer;
            transition: all var(--transition-normal);
        }

        .newsletter-btn:hover {
            box-shadow: var(--shadow-glow);
        }

        /* ===== FOOTER ===== */
        .footer {
            background: var(--color-charcoal);
            color: var(--color-white);
            padding: var(--spacing-4xl) 0 var(--spacing-2xl);
            position: relative;
        }

        .footer::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent 0%, var(--color-primary-light) 50%, transparent 100%);
        }

        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: var(--spacing-2xl);
            margin-bottom: var(--spacing-2xl);
        }

        .footer-section h3 {
            font-size: 1.25rem;
            font-weight: var(--font-weight-semibold);
            margin-bottom: var(--spacing-lg);
            color: var(--color-primary-light);
            letter-spacing: -0.01em;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: var(--spacing-sm);
        }

        .footer-links a {
            color: var(--color-gray-300);
            transition: all var(--transition-normal);
            font-weight: var(--font-weight-normal);
            letter-spacing: -0.005em;
        }

        .footer-links a:hover {
            color: var(--color-primary-light);
            transform: translateX(4px);
        }

        .social-links {
            display: flex;
            gap: var(--spacing-md);
            margin-top: var(--spacing-lg);
        }

        .social-link {
            width: 44px;
            height: 44px;
            background: var(--gradient-primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-white);
            transition: all var(--transition-normal);
            font-size: 1.1rem;
            box-shadow: var(--shadow-sm);
        }

        .social-link:hover {
            transform: scale(1.1) translateY(-2px);
            box-shadow: var(--shadow-glow);
        }

        .footer-bottom {
            padding-top: var(--spacing-xl);
            border-top: 1px solid var(--color-gray-700);
            text-align: center;
            color: var(--color-gray-400);
            font-size: 0.95rem;
            letter-spacing: -0.005em;
        }

        /* ===== RESPONSIVE UTILITIES ===== */
        @media (max-width: 767px) {
            .hide-mobile {
                display: none;
            }

            .testimonials-container {
                overflow: visible; 
                margin-left: 0;   
                margin-right: 0; 
            }

            .testimonials-track {
                flex-direction: column;
                align-items: stretch;   
                gap: 0;                
                transform: none !important;
            }

            .testimonial-card {
                width: 100%;             /* Card chiếm 100% chiều rộng của track */
                min-width: unset;        /* Gỡ bỏ min-width từ desktop/tablet để card có thể co giãn */
                max-width: 100%;         /* Gỡ bỏ max-width từ desktop/tablet */
                margin-left: auto;       /* Đảm bảo card được căn giữa (thường không cần thiết khi width 100%) */
                margin-right: auto;
                margin-bottom: var(--spacing-lg); /* Tạo khoảng cách giữa các card theo chiều dọc */
                flex-shrink: 1;          /* Cho phép card co lại nếu cần, mặc định là 0 cho slider */
            }

            .testimonial-card:last-child {
                margin-bottom: 0;        /* Bỏ margin dưới cho card cuối cùng */
            }

            /* Ẩn các nút điều khiển và chấm của slider trên màn hình nhỏ */
            .testimonials-controls,
            .testimonials-dots {
                display: none !important; /* Dùng !important để đảm bảo ghi đè */
            }
            /* === END: Chuyển Testimonials sang dạng dọc trên mobile === */
            
            .live-stats {
                position: relative;
                margin-bottom: var(--spacing-lg);
            }
        }

        @media (min-width: 768px) {
            .hide-desktop {
                display: none;
            }
        }

        /* ===== ANIMATION CLASSES ===== */
        .fade-in-up {
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.6s ease-out;
        }

        .fade-in-up.animate {
            opacity: 1;
            transform: translateY(0);
        }

        .fade-in-left {
            opacity: 0;
            transform: translateX(-30px);
            transition: all 0.6s ease-out;
        }

        .fade-in-left.animate {
            opacity: 1;
            transform: translateX(0);
        }

        .fade-in-right {
            opacity: 0;
            transform: translateX(30px);
            transition: all 0.6s ease-out;
        }

        .fade-in-right.animate {
            opacity: 1;
            transform: translateX(0);
        }

        /* ===== LOADING STATES ===== */
        .loading {
            opacity: 0.7;
            pointer-events: none;
        }

        .spinner {
            width: 20px;
            height: 20px;
            border: 2px solid transparent;
            border-top: 2px solid currentColor;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* ===== SKELETON LOADING ===== */
        .skeleton {
            background: linear-gradient(90deg, var(--color-gray-200) 25%, var(--color-gray-100) 50%, var(--color-gray-200) 75%);
            background-size: 200% 100%;
            animation: loading 1.5s infinite;
        }

        @keyframes loading {
            0% { background-position: 200% 0; }
            100% { background-position: -200% 0; }
        }