* {
    margin: 0;
    padding: 0;
    font-family: "Poppins", sans-serif;
}

.main_box {
    background-image: url("photo.jpg");
    background-size: cover;
    height: 100vh;
}

/* Hamburger icon */
.btn_one i {
    color: white;
    font-size: 30px;
    font-weight: 700;
    line-height: 60px;
    position: absolute;
    left: 20px;
    cursor: pointer;
    opacity: 1;
    transition-property: font-size, opacity;
    transition-duration: 0.25s, 0.25s;
    transition-timing-function: ease-out, ease-out;
    transition-delay: 0s, 0.4s;
    /* fade-in after sidebar closes */
}

/* Sidebar */
.sidebar_menu {
    width: 300px;
    height: 100vh;
    position: fixed;
    left: -300px;
    /* hidden initially */
    background-color: transparent;
    box-shadow: 0 0 6px rgba(255, 255, 255, 0.5);
    transition: left 0.4s ease-in-out;
}

/* Logo */
.sidebar_menu .logo {
    position: absolute;
    width: 100%;
    line-height: 60px;
    margin-left: 10px;
    box-shadow: 0 0 4px rgba(255, 255, 255, 0.5);
}

.sidebar_menu .logo a {
    position: absolute;
    left: 20px;
    /* aligned with menu items */
    color: white;
    text-decoration: none;
    font-size: 20px;
    font-weight: 500;
    transition: left 0.4s ease-in-out;
}

/* Close icon */
.sidebar_menu .btn_two i {
    color: grey;
    font-size: 25px;
    line-height: 60px;
    position: absolute;
    left: 270px;
    cursor: pointer;
    opacity: 0;
    transition-property: font-size, opacity;
    transition-duration: 0.25s, 0.25s;
    transition-timing-function: ease-out, ease-out;
    transition-delay: 0s, 0.15s;
}

/* Menu section */
.sidebar_menu .menu {
    width: 100%;
    position: absolute;
    top: 80px;
}

.sidebar_menu .menu ul {
    list-style: none;
}

.sidebar_menu .menu li {
    padding: 15px 20px;
    display: flex;
    align-items: center;
    transition: box-shadow 0.3s ease-in-out;
}

.sidebar_menu .menu i,
.sidebar_menu .menu a {
    color: white;
    font-size: 20px;
    text-decoration: none;
}

.menu i {
    padding-right: 10px;
}

/* Social media */
.social_media {
    font-size: 20px;
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
}

.social_media ul {
    list-style: none;
    display: flex;
    gap: 10px;
}

.social_media i {
    color: white;
    opacity: 0.5;
    cursor: pointer;
    transition-property: opacity, transform;
    transition-duration: 0.3s, 0.3s;
    transition-timing-function: ease, ease;
}

/* Checkbox */
#check {
    display: none;
}

/* Hover effects */
.menu li:hover {
    box-shadow: 0 0 6px rgba(255, 255, 255, 0.5);
}

.btn_one i:hover {
    font-size: 35px;
}

.btn_two i:hover {
    font-size: 30px;
}

.social_media i:hover {
    opacity: 1;
    transform: scale(1.2);
}

/* Sidebar open state */
#check:checked~.sidebar_menu {
    left: 0;
}

/* Hide hamburger when open */
#check:checked~.btn_one i {
    opacity: 0;
    transition-delay: 0s, 0s;   /* no delay for hiding */
    pointer-events: none;
}

/* Show close icon when open */
#check:checked~.sidebar_menu .btn_two i {
    opacity: 1;
}