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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            overflow-x: hidden;
            background: linear-gradient(180deg, #0a0a2e 0%, #16213e 50%, #1a1a3a 100%);
            min-height: 100vh;
            position: relative;
        }

        /* Animated stars background */
        .stars {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 1;
        }

        .star {
            position: absolute;
            background: white;
            border-radius: 50%;
            animation: twinkle 3s infinite;
        }

        .star:nth-child(odd) {
            animation-delay: 1.5s;
        }

        @keyframes twinkle {
            0%, 100% { opacity: 0.3; transform: scale(1); }
            50% { opacity: 1; transform: scale(1.2); }
        }

        /* Floating decorative elements */
        .decorative {
            position: absolute;
            color: #ff6b9d;
            font-size: 24px;
            animation: float 6s ease-in-out infinite;
        }

        .decorative:nth-child(even) {
            animation-delay: 3s;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px) rotate(0deg); }
            50% { transform: translateY(-20px) rotate(180deg); }
        }



        /* Mountain silhouette */
        .mountains {
            position: absolute;
            bottom: 0;
            width: 100%;
            height: 200px;
            background: linear-gradient(to right, 
                #1a1a3a 0%, #2d2d5a 25%, #1a1a3a 50%, #2d2d5a 75%, #1a1a3a 100%);
            clip-path: polygon(
                0% 100%, 
                0% 70%, 
                10% 60%, 
                20% 65%, 
                30% 45%, 
                40% 50%, 
                50% 30%, 
                60% 40%, 
                70% 25%, 
                80% 35%, 
                90% 40%, 
                100% 20%, 
                100% 100%
            );
            z-index: 2;
        }

        /* Main container */
        .container {
            position: relative;
            z-index: 10;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        /* Profile section */
        .profile-section {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 20px;
            padding: 40px;
            display: flex;
            align-items: center;
            gap: 40px;
            margin-bottom: 40px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
            max-width: 900px;
            width: 100%;
        }

        .avatar {
            width: 150px;
            height: 150px;
            border-radius: 25px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 60px;
            color: white;
            flex-shrink: 0;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            position: relative;
            cursor: pointer;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .avatar:hover {
            transform: scale(1.05);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
        }

        .avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 25px;
        }

        .avatar-upload-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: opacity 0.3s ease;
            border-radius: 25px;
            color: white;
            font-size: 14px;
            font-weight: 600;
            text-align: center;
            flex-direction: column;
            gap: 5px;
        }

        .avatar:hover .avatar-upload-overlay {
            opacity: 1;
        }

        .upload-icon {
            font-size: 24px;
            margin-bottom: 5px;
        }

        #avatarInput {
            display: none;
        }

        .profile-info {
            flex: 1;
        }

        .name-section {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 10px;
        }

        .name {
            font-size: 2.5rem;
            font-weight: 700;
            color: white;
            font-style: italic;
        }

        .verified {
            width: 24px;
            height: 24px;
            background: #1da1f2;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 16px;
        }

        .title {
            color: #ff6b9d;
            font-size: 1.2rem;
            font-weight: 500;
            margin-bottom: 20px;
        }

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

        .social-link {
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            text-decoration: none;
            transition: all 0.3s ease;
        }

        .social-link:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: translateY(-2px);
        }

        /* Contact info section */
        .contact-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            max-width: 900px;
            width: 100%;
        }

        .contact-card {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 15px;
            padding: 25px;
            display: flex;
            align-items: center;
            gap: 15px;
            transition: all 0.3s ease;
        }

        .contact-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
        }

        .contact-icon {
            width: 50px;
            height: 50px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: white;
        }

        .contact-icon.email { background: linear-gradient(135deg, #667eea, #764ba2); }
        .contact-icon.website { background: linear-gradient(135deg, #f093fb, #f5576c); }
        .contact-icon.phone { background: linear-gradient(135deg, #4facfe, #00f2fe); }
        .contact-icon.location { background: linear-gradient(135deg, #43e97b, #38f9d7); }

        .contact-info h3 {
            color: #ccc;
            font-size: 0.9rem;
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 5px;
        }

        .contact-info p {
            color: white;
            font-size: 1.1rem;
            font-weight: 600;
        }

        /* Welcome message */
        .welcome-message {
            text-align: center;
            margin-top: 40px;
            color: #ffd700;
            font-size: 1.3rem;
            font-weight: 500;
        }

        .highlight {
            color: #00d4ff;
            font-weight: 700;
        }

        /* Payment section styles */
        .payment-section {
            margin-top: 30px;
            text-align: center;
            max-width: 1200px;
            width: 100%;
        }

        .payment-header {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            color: white;
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .underline {
            width: 100px;
            height: 4px;
            background: linear-gradient(90deg, #ff6b35, #f7931e);
            margin: 0 auto 40px;
            border-radius: 2px;
        }

        .payment-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
            padding: 0 20px;
        }

        .payment-card {
            background: rgba(30, 30, 50, 0.8);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 20px;
            padding: 30px;
            text-align: center;
            position: relative;
            transition: all 0.3s ease;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
        }

        .payment-card:hover {
            transform: translateY(-8px);
            border-color: rgba(255, 255, 255, 0.3);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
        }

        .bank-icon {
            width: 60px;
            height: 60px;
            margin: 0 auto 20px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
        }

        .bank-name {
            color: white;
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 15px;
        }

        .account-name {
            color: #bbb;
            font-size: 1rem;
            font-weight: 500;
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .account-number {
            color: white;
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 20px;
            font-family: 'Courier New', monospace;
        }

        .copy-btn {
            background: linear-gradient(135deg, #4facfe, #00f2fe);
            color: white;
            border: none;
            padding: 12px 30px;
            border-radius: 25px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(79, 172, 254, 0.3);
        }

        .copy-btn:hover {
            background: linear-gradient(135deg, #00f2fe, #4facfe);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(79, 172, 254, 0.4);
        }

        .copy-btn:active {
            transform: translateY(0);
        }
        .qr-btn {
    background: linear-gradient(135deg, #ff6b6b, #f94d6a);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-left: 10px;
    box-shadow: 0 5px 15px rgba(249, 77, 106, 0.3);
    position: relative;
    overflow: hidden;
}

/* Hiệu ứng hover: đổi màu + nổi lên */
.qr-btn:hover {
    background: linear-gradient(135deg, #f94d6a, #ff6b6b);
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 20px rgba(249, 77, 106, 0.5);
}

/* Hiệu ứng click */
.qr-btn:active {
    transform: translateY(0) scale(0.97);
}

/* Hiệu ứng sáng quét ngang */
.qr-btn::before {
    content: "";
    position: absolute;
    top: 0;
    left: -75px;
    width: 50px;
    height: 100%;
    background: rgba(255, 255, 255, 0.4);
    transform: skewX(-25deg);
    transition: left 0.5s ease;
}

.qr-btn:hover::before {
    left: 125%;
}
/* QR Modal styles */
.qr-modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0; top: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    align-items: center;
    justify-content: center;
}

.qr-modal-content {
    background: #fff;
    padding: 20px 30px;
    border-radius: 20px;
    text-align: center;
    max-width: 320px;
    width: 90%;
    animation: zoomIn 0.3s ease;
    position: relative;
}

.qr-modal-content h3 {
    margin-bottom: 15px;
    color: #333;
    font-size: 1.2rem;
    font-weight: 700;
}

.qr-modal-content img {
    width: 250px;
    border-radius: 12px;
    margin-bottom: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

.close-btn {
    position: absolute;
    top: 12px; right: 15px;
    font-size: 24px;
    color: #333;
    cursor: pointer;
    transition: 0.3s;
}

.close-btn:hover {
    color: #ff4d4d;
}

/* Download button */
.download-btn {
    display: inline-block;
    background: linear-gradient(135deg, #43e97b, #38f9d7);
    color: white;
    padding: 10px 20px;
    border-radius: 25px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
}

.download-btn:hover {
    background: linear-gradient(135deg, #38f9d7, #43e97b);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(56, 249, 215, 0.4);
}

@keyframes zoomIn {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}



        /* Decorative elements on payment cards */
        .decorative-flower {
            position: absolute;
            top: 15px;
            right: 15px;
            color: #ff6b9d;
            font-size: 20px;
            animation: rotate 4s linear infinite;
        }

        .decorative-star {
            position: absolute;
            top: 15px;
            right: 15px;
            color: #ffd700;
            font-size: 18px;
            animation: pulse 2s ease-in-out infinite;
        }

        .decorative-flower.small {
            font-size: 16px;
            top: 20px;
            right: 20px;
        }

        @keyframes rotate {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        @keyframes pulse {
            0%, 100% { opacity: 0.6; transform: scale(1); }
            50% { opacity: 1; transform: scale(1.1); }
        }

        .coin-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, #ffd700, #ffed4e);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            animation: bounce 2s infinite;
        }

        @keyframes bounce {
            0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
            40% { transform: translateY(-10px); }
            60% { transform: translateY(-5px); }
        }

        /* Footer styles */
        .footer {
            background: linear-gradient(135deg, rgba(0, 0, 0, 0.9) 0%, rgba(26, 26, 58, 0.9) 100%);
            backdrop-filter: blur(20px);
            border-top: 2px solid rgba(255, 215, 0, 0.3);
            color: #fff;
            text-align: center;
            padding: 25px 20px;
            font-size: 1rem;
            font-weight: 500;
            position: relative;
            z-index: 10;
            margin-top: 60px;
            box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.3);
            letter-spacing: 0.5px;
        }

        .footer a {
            color: #ffd700;
            text-decoration: none;
            font-weight: 700;
            transition: all 0.3s ease;
            padding: 5px 10px;
            border-radius: 20px;
            background: rgba(255, 215, 0, 0.1);
            border: 1px solid rgba(255, 215, 0, 0.3);
        }

        .footer a:hover {
            color: #fff;
            background: linear-gradient(135deg, #ffd700, #ffed4e);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(255, 215, 0, 0.4);
            text-decoration: none;
        }

        /* Responsive design */
        @media (max-width: 768px) {
            body {
                font-size: 14px;
                overflow-x: hidden;
            }

            .container {
                padding: 20px 15px;
                min-height: auto;
            }

            .profile-section {
                flex-direction: column;
                text-align: center;
                padding: 20px 15px;
                gap: 20px;
            }

            .avatar {
                width: 120px;
                height: 120px;
            }

            .avatar img {
                width: 100%;
                height: 100%;
            }

            .name {
                font-size: 1.8rem;
                margin-bottom: 10px;
            }

            .title {
                font-size: 1rem;
                margin-bottom: 15px;
            }

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

            .social-link {
                width: 45px;
                height: 45px;
                font-size: 1.2rem;
            }

            .contact-grid {
                grid-template-columns: 1fr;
                gap: 15px;
                margin-top: 30px;
            }

            .contact-card {
                padding: 20px 15px;
                flex-direction: row;
                align-items: center;
                gap: 15px;
            }

            .contact-icon {
                width: 50px;
                height: 50px;
                font-size: 1.5rem;
                flex-shrink: 0;
            }

            .contact-info h3 {
                font-size: 1rem;
                margin-bottom: 5px;
            }

            .contact-info p {
                font-size: 0.9rem;
            }

            .welcome-message {
                font-size: 1rem;
                padding: 20px 15px;
                margin-top: 30px;
            }

            .payment-section {
                margin-top: 30px;
            }

            .payment-header {
                font-size: 1.3rem;
                margin-bottom: 20px;
            }

            .payment-grid {
                grid-template-columns: 1fr;
                gap: 15px;
            }

            .payment-card {
                padding: 20px 15px;
                flex-direction: row;
                align-items: center;
                gap: 15px;
            }

            .bank-icon {
                width: 50px;
                height: 50px;
                flex-shrink: 0;
            }

            .bank-icon img {
                width: 100%;
                height: 100%;
            }

            .payment-info h3 {
                font-size: 1.1rem;
                margin-bottom: 5px;
            }

            .payment-info p {
                font-size: 0.9rem;
            }

            .footer {
                padding: 20px 15px;
                font-size: 0.9rem;
                margin-top: 40px;
            }
            
            .footer a {
                padding: 4px 8px;
                font-size: 0.85rem;
            }

            /* Hide decorative elements on mobile for better performance */
            .decorative {
                display: none;
            }


        }

        /* Extra small devices */
        @media (max-width: 480px) {
            .container {
                padding: 15px 10px;
            }

            .profile-section {
                padding: 15px 10px;
            }

            .name {
                font-size: 1.6rem;
            }

            .avatar {
                width: 100px;
                height: 100px;
            }

            .contact-card {
                padding: 15px 10px;
            }

            .payment-card {
                padding: 15px 10px;
            }

            .welcome-message {
                padding: 15px 10px;
                font-size: 0.9rem;
            }
        }

        /* Education Timeline Styles */
        .education-section {
            padding: 60px 20px;
            max-width: 1200px;
            margin: 0 auto;
            position: relative;
            z-index: 10;
        }

        .education-title {
            text-align: center;
            color: #fff;
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 50px;
            text-transform: uppercase;
            letter-spacing: 2px;
            background: linear-gradient(135deg, #ff6b9d, #4facfe);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .timeline-container {
            position: relative;
            max-width: 800px;
            margin: 0 auto;
            background: rgba(0, 0, 0, 0.8);
            backdrop-filter: blur(20px);
            border-radius: 20px;
            padding: 40px;
            border: 2px solid rgba(255, 107, 157, 0.3);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
        }

        .timeline {
            position: relative;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 30px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: linear-gradient(180deg, #4facfe, #ff6b9d);
        }

        .timeline-item {
            position: relative;
            margin-bottom: 40px;
            padding-left: 80px;
        }

        .timeline-item:last-child {
            margin-bottom: 0;
        }

        .timeline-icon {
            position: absolute;
            left: 0;
            top: 0;
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, #4facfe, #ff6b9d);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 10px 20px rgba(79, 172, 254, 0.3);
            border: 3px solid rgba(255, 255, 255, 0.2);
        }

        .timeline-icon::before {
            content: '🎓';
            font-size: 24px;
        }

        .timeline-content {
            background: rgba(255, 255, 255, 0.05);
            border-radius: 15px;
            padding: 25px;
            border: 1px solid rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
        }

        .timeline-date {
            display: inline-block;
            background: linear-gradient(135deg, #4facfe, #ff6b9d);
            color: white;
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 15px;
            box-shadow: 0 5px 15px rgba(79, 172, 254, 0.3);
        }

        .timeline-date::before {
            content: '📅 ';
            margin-right: 5px;
        }

        .timeline-institution {
            color: #fff;
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 10px;
            background: linear-gradient(135deg, #ff6b9d, #4facfe);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .timeline-description {
            color: #ccc;
            font-size: 1rem;
            line-height: 1.6;
            margin: 0;
        }

        @media (max-width: 768px) {
            .education-section {
                padding: 40px 15px;
            }
            
            .education-title {
                font-size: 2rem;
                margin-bottom: 30px;
            }
            
            .timeline-container {
                padding: 25px;
            }
            
            .timeline-item {
                padding-left: 70px;
            }
            
            .timeline-icon {
                width: 50px;
                height: 50px;
            }
            
            .timeline-icon::before {
                font-size: 20px;
            }
            
            .timeline-institution {
                font-size: 1.1rem;
            }
            
            .timeline-description {
                font-size: 0.9rem;
            }
        }

        @media (max-width: 480px) {
            .education-title {
                font-size: 1.5rem;
            }
            
            .timeline-container {
                padding: 20px;
            }
            
            .timeline-item {
                padding-left: 60px;
            }
            
            .timeline-icon {
                width: 45px;
                height: 45px;
            }
            
            .timeline-content {
                padding: 20px;
            }
        }
    

 @-webkit-keyframes my { 0% { color: #ffd700; } 50% { color: #fff; } 100% { color: #ffd700; } } @-moz-keyframes my { 0% { color: #008080; } 50% { color: #fff; } 100% { color: #008080; } } @-o-keyframes my { 0% { color: #0000FF; } 50% { color: #fff; } 100% { color: #0000FF; } } @keyframes my { 0% { color: #808000; } 50% { color: #fff; } 100% { color: #808000; } } .tet { background:#00000; font-size:18px; font-weight:bold; -webkit-animation: my 700ms infinite; -moz-animation: my 700ms infinite; -o-animation: my 700ms infinite; animation: my 700ms infinite; } 


        .music-btn {
            position: absolute;
            top: 20px;
            right: 20px;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: linear-gradient(135deg, #4facfe, #00f2fe);
            border: none;
            color: white;
            font-size: 20px;
            cursor: pointer;
            box-shadow: 0 8px 25px rgba(79, 172, 254, 0.4);
            transition: all 0.3s ease;
            z-index: 10;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .music-btn:hover {
            transform: scale(1.1);
            box-shadow: 0 12px 35px rgba(79, 172, 254, 0.6);
        }

        .music-btn:active {
            transform: scale(0.95);
        }

        @media (max-width: 768px) {
            .music-btn {
                top: 15px;
                right: 15px;
                width: 50px;
                height: 50px;
                font-size: 16px;
            }
        }