body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
    background: url(../images/bgpc.png) no-repeat center center fixed;
    background-size: cover;
}

.main-header {
    /* Nền header dạng trắng mờ, hiệu ứng blur, đổ bóng xanh nhạt */
    background: rgba(255, 255, 255, 0.50);
    box-shadow: 0px 4px 7px 0px rgba(3, 98, 128, 0.20);
    backdrop-filter: blur(4.5px);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.main-header-container {
    height: 100%;
}

.logo {
    max-height: 50px;
    width: auto;
}

nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

nav a {
    text-decoration: none;
    color: white;
    padding: 10px 20px;
    border-radius: 50px;
    font-weight: bold;
}

.login-btn, .register-btn {
    background: linear-gradient(to bottom, #71E6FF, #00A3C6);
    color: white; /* Make sure text is visible */
    border: none;
    font-size: 12px;
    padding: 8px 14px;
    margin-top: 10px;
}

.main-content {
    text-align: center;
    padding: 20px 15px 60px;
}

.main-title-img {
    max-width: 500px;
    width: 100%;
}

.main-description {
    color: #000;
    text-align: center;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.5;
    max-width: 800px;
    margin: 0 auto 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.download-section {
    width: 100%;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    flex-direction: column;
    gap: 1rem;
}

.intro-img {
    max-width: 500px;
    width: 100%;
}

.download-section .row {
    width: 100%;
    max-width: 600px;
}

.home-btn-link {
    position: relative;
    display: block;
}

.home-btn-link img {
    max-width: 400px;
    margin: 10px auto;
    height: auto;
}

.blinking-container .blink-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: auto;
}


/* Info Section */
.info-section {
    padding: 0 15px;
    margin: 0px auto 40px;
}

.info-content {
    background-color: rgba(255, 255, 255, 0.8);
    border: 3px solid white;
    border-radius: 25px;
    padding: 20px;
    max-width: 1100px;
    margin: 0 auto;
}

.info-title-img {
    max-width: 100%;
    width: 500px;
}

.info-heading {
    color: #02A9DC; 
    font-weight: 700; 
    font-size: 18px; 
    margin-bottom: 8px;
    margin-top: 20px;
}

.info-text {
    color: #191919; 
    font-size: 16px; 
    font-weight: 500; 
    margin-bottom: 12px;
    text-align: justify;
}

.footer-text {
    color: #02A9DC; 
    font-weight: 700; 
    font-size: 20px; 
    text-align: center; 
    margin-top: 20px;
}

/* Responsive Styles */
@media (max-width: 768px) {
    .main-header {
        padding: 10px 15px;
    }

    .logo {
        max-height: 40px;
    }

    nav a {
        padding: 8px 12px;
        font-size: 14px;
    }
    
    .main-content {
        padding: 20px 15px 60px;
    }

    .main-description {
        font-size: 14px;
    }

    .info-content {
        padding: 15px;
    }

    .info-heading {
        font-size: 16px;
    }

    .info-text {
        font-size: 14px;
    }

    .footer-text {
        font-size: 18px;
    }

    .download-section {
        gap: 0;

    }

    .info-section {
        padding: 0;
    }
}

@media (max-width: 576px) {
    .logo {
        max-height: 35px;
    }

    nav a {
        padding: 6px 10px;
        font-size: 12px;
    }

    .main-header .container {
        gap: 10px;
    }

    .download-section .row {
        gap: 1rem;
    }

    .main-description {
        font-size: 12px;
    }

    .info-heading {
        font-size: 15px;
    }

    .info-text {
        font-size: 13px;
    }

    .footer-text {
        font-size: 16px;
    }
}