header.pc {
    display: none;
}
header.m {
    display: flex;
}

@media (min-width: 740px) {
    header.pc {
        display: flex;
    }
    header.m {
        display: none;
    }
}

header.pc,
header.m {
    align-items: center;
    justify-content: space-between;
    padding: 1rem 32px;
    background: var(--bg-1);
    box-shadow: var(--shadow);
}

@media (min-width: 1000px) {
    header.pc,
    header.m {
        padding-left: 10%;
        padding-right: 10%;
    }
}

header .logo {
    height: 40px;
    width: auto;
}

header.pc nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

header nav a {
    position: relative;
    text-decoration: none;
    color: var(--col-txt);
}

header nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 2px;
    background: currentColor;
    transition: width 0.3s ease;
}

header nav a:hover::after {
    width: 100%;
}

header.m {
    position: relative;
}

header.m .icon-tabler-menu-2 {
    cursor: pointer;
    color: var(--color-1);
}

header.m .icon-tabler-menu-2 .line-top,
header.m .icon-tabler-menu-2 .line-middle,
header.m .icon-tabler-menu-2 .line-bottom {
    transform-box: fill-box;
    transform-origin: center;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

header.m .icon-tabler-menu-2.open .line-top {
    transform: translateY(6px) rotate(45deg);
}

header.m .icon-tabler-menu-2.open .line-middle {
    opacity: 0;
}

header.m .icon-tabler-menu-2.open .line-bottom {
    transform: translateY(-6px) rotate(-45deg);
}

header.m nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1rem;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: 1rem 2rem;
    background: var(--bg-1);
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
}

header.m nav.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}