:root {
    --bg-color: #121212;
    --text-color: #ffffff;
    --header-bg: #1e1e1e;
    --profile-bg: #3a3a3a;
    --button-bg: #00c4ef;
    --button-text: #ffffff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
    transition: background-color 0.3s, color 0.3s, width 0.3s, height 0.3s, backdrop-filter 0.3s, filter 0.3s, opacity 0.3s;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: 1rem 2rem;
    z-index: 1000;
    /* backdrop-filter: blur(10px); */
}

header h1 {
    font-size: 1.2rem;
    color: var(--text-color);
}

header nav a {
    color: var(--text-color);
    text-decoration: none;
    margin: 0 1rem;
}

header nav a:hover {
    text-decoration: underline;
}

main {
    padding: 2rem;
}

#bg {
    position: fixed;
    z-index: -1;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}

#bg>img {
    width: calc(100% + 4rem);
    height: calc(100% + 4rem);
    filter: brightness(0.5);
    object-fit: cover;
}

.box {
    border-radius: 20px;
    padding: 2rem;
    background-color: #ffffff1e;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    margin: 2rem auto;

}

footer {
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
}

.hide {
    opacity: 0 !important;
    background-color: transparent !important;
    box-shadow: none !important;
    /* pointer-events: none!important; */
}

/* Hiệu ứng xuất hiện mờ dần */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Hiệu ứng phóng to từ nhỏ đến lớn */
@keyframes scaleIn {
    from {
        transform: scale(0);
    }

    to {
        transform: scale(1);
    }
}

/* Hiệu ứng vẽ đường path */
@keyframes drawPath {
    to {
        stroke-dashoffset: 0;
    }
}

*::-webkit-scrollbar-track
{
	-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
	background-color: transparent;
}

*::-webkit-scrollbar
{
	width: 10px;
	background-color: #f5f5f500;
}

*::-webkit-scrollbar-thumb
{
	background-color: #a1a1a132;
	border: 2px solid #2f2f2f00;
}