body {
    margin: 0;
    background-color: #1d273e;
    font-family: 'Orbitron', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

.loading-container {
    text-align: center;
    animation: fadeInContainer 1s ease-out forwards;
}

.checkmark {
    width: 120px;
    height: 120px;
    stroke: url(#checkGrad);
    stroke-width: 4;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.checkmark__circle {
    stroke: #e6e6e6;
    stroke-dasharray: 166;
    stroke-dashoffset: 166;
    animation: strokeCircle 0.8s ease-out forwards;
}

.checkmark__check {
    stroke-dasharray: 48;
    stroke-dashoffset: 48;
    animation: strokeCheck 0.4s 0.8s ease-out forwards;
}

@keyframes strokeCircle {
    to {
        stroke-dashoffset: 0;
    }
}

@keyframes strokeCheck {
    to {
        stroke-dashoffset: 0;
    }
}

.logo-glow {
    margin-top: 8px;
    font-size: 35px;
    background: linear-gradient(to right, #007BFF, #FF6F00);
    background-clip: text;
    -webkit-text-fill-color: transparent;
    opacity: 0;
    transform: scale(0.95);
    animation: fadeInText 0.6s ease-out 1.3s forwards, glow 2s ease-in-out infinite alternate;
}

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

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

@keyframes fadeInText {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes glow {
    from {
        text-shadow: 0 0 5px rgba(0, 123, 255, 0.4);
    }

    to {
        text-shadow: 0 0 15px rgba(255, 111, 0, 0.8);
    }
}

/* Loader fade-out animation */
.fade-out {
    opacity: 0;
    transition: opacity 0.6s ease-out;
}

/* Loader container style (nếu chưa có) */
.loading-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #1d273e;
    /* hoặc màu nền app */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.6s ease-out;
}