/* UI effects split from style.css */

/* Custom nav open button (btn_navOpen) */
#btn_navOpen.hamburger-menu {
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 8px;
    padding: 10px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1002;
    display: none;
    /* 기본적으로 숨김 (데스크탑) */
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
}

#btn_navOpen.hamburger-menu b {
    display: grid;
    grid-auto-flow: row;
    gap: 4px;
    font-size: 0;
    /* 텍스트 숨김(아이콘만) */
    line-height: 0;
}

#btn_navOpen.hamburger-menu b span {
    display: block;
    width: 18px;
    height: 2px;
    background: #111;
    border-radius: 999px;
    transform-origin: center;
    transition: background 0.25s ease, transform 0.35s ease, width 0.25s ease;
}

/* middle bar slightly shorter */
#btn_navOpen.hamburger-menu b span:nth-child(2) {
    width: 12px;
    justify-self: end;
}

/* Hover: invert span colors + flip middle bar */
/* #btn_navOpen.hamburger-menu:hover {
    background: rgba(17, 17, 17, 0.92);
    border-color: rgba(255, 255, 255, 0.18);
    transform: translateY(-1px);
} */

/* active state: transform to X */
#btn_navOpen.hamburger-menu.is-active b span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
    background: #fff;
}

#btn_navOpen.hamburger-menu.is-active b span:nth-child(2) {
    opacity: 0;
    transform: translateX(10px);
}

#btn_navOpen.hamburger-menu.is-active b span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
    background: #fff;
}

#btn_navOpen.hamburger-menu.is-active b span {
    background: #fff;
}

#btn_navOpen.hamburger-menu.is-active {
    background: transparent;
    border-color: rgba(255, 255, 255, 0.2);
}

#btn_navOpen.hamburger-menu:hover b span:nth-child(2) {
    width: 18px;
    transform: translateX(0);
}

#btn_navOpen.hamburger-menu:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 152, 40, 0.35);
    border-color: rgba(255, 152, 40, 0.55);
}