/* ===== JustKid Nav (jk-nav.css) ===== */
:root {
    --jk-accent-green: #656d4a95;
    --jk-text: #2c2c2c;
    --jk-border: #e0e0e0;
    /* use site-level nav alpha token if available (falls back to .95) */
    --jk-bg: rgba(249,247,243, var(--nav-bg, 0.95));
    --jk-nav-h: 100px;
    /* menu animation variables */
    --jk-menu-duration: 0.45s;
    --jk-menu-ease: cubic-bezier(.22,.9,.24,1);
    --jk-initial-delay: 0.12s;
    --jk-stagger: 0.08s;
    --jk-overlay: rgba(0,0,0,0.05);
    /* closing specific (slower for links) */
    --jk-close-duration: 0.75s;
    --jk-container-close: 0.08s;
}

.jk-nav {
    position: fixed;
    inset: 0 0 auto 0;
    height: var(--jk-nav-h);
    background: var(--jk-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--jk-border);
    z-index: 1000;
}

.jk-nav, .jk-menu, .jk-link {
    font-family: var(--font-display);
}

.jk-nav__inner {
    max-width: 1200px;
    margin: 0 auto;
    height: 100%;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.jk-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
    text-decoration: none;
}

.jk-brand__logo {
    width: 70px;
    height: 70px;
    object-fit: contain;
}

.jk-brand__text {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--jk-accent-green);
}

/* menu */
.jk-menu {
    display: flex;
    gap: 3rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

    .jk-menu li {
        display: block;
        visibility: visible;
        opacity: 1;
    }

        .jk-menu li:first-child {
            display: block !important;
            visibility: visible !important;
            opacity: 1 !important;
        }

.jk-link {
    color: var(--jk-text);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: color .2s ease;
    display: inline-block;
    visibility: visible;
    opacity: 1;
    font-size: 1rem;
}

    .jk-link:first-child {
        display: inline-block !important;
        visibility: visible !important;
        opacity: 1 !important;
    }

    .jk-link:hover {
        color: var(--jk-accent-green);
    }

    /* active 狀態（指定顏色文字 + 底線） */
    .jk-link.is-active {
        color: #3C5314;
    }

        .jk-link.is-active::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: -6px;
            height: 2px;
            background: #3C5314;
        }

/* hamburger */
.jk-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    position: relative;
    width: 25px;
    height: 21px;
}

    .jk-toggle span {
        width: 25px;
        height: 3px;
        background: var(--jk-text);
        transition: all .3s ease;
        position: absolute;
        left: 0;
    }

        .jk-toggle span:nth-child(1) {
            top: 0;
        }

        .jk-toggle span:nth-child(2) {
            top: 9px;
        }

        .jk-toggle span:nth-child(3) {
            top: 18px;
        }

    .jk-toggle.is-open span:nth-child(1) {
        top: 9px;
        transform: rotate(45deg);
    }

    .jk-toggle.is-open span:nth-child(2) {
        opacity: 0;
    }

    .jk-toggle.is-open span:nth-child(3) {
        top: 9px;
        transform: rotate(-45deg);
    }

/* 占位，避免內容被 fixed nav 蓋住 */
.jk-offset {
    height: 0;
}

/* RWD */
@media (max-width: 640px) {
    .jk-toggle {
        display: flex;
        z-index: 1002;
        position: relative;
    }

    .jk-nav {
        transition: background 0.4s ease, backdrop-filter 0.4s ease;
    }

        .jk-nav.menu-open {
            position: fixed;
            top: 0;
            right: 0;
            left: 0;
            bottom: 0;
            height: 100vh;
            /* use same nav alpha token so mobile menu consistency follows --nav-bg */
            background: rgba(249,247,243, var(--nav-bg, 0.98));
            backdrop-filter: blur(10px);
            border-bottom: none;
            z-index: 1001;
            transition: background 1s ease, backdrop-filter 1s ease;
        }

            .jk-nav.menu-open .jk-nav__inner {
                height: var(--jk-nav-h);
            }

    .jk-menu {
        position: fixed;
        top: var(--jk-nav-h);
        right: 0;
        left: 0;
        bottom: 0;
        background: transparent;
        display: flex;
        flex-direction: column;
        justify-content: space-evenly;
        align-items: center;
        gap: 0;
        padding: 2rem;
        z-index: 1001;
        overflow-y: auto;
        opacity: 0;
        visibility: hidden;
        /* 從整個選單頂端滑下 */
        transform: translateY(-100%);
        transform-origin: top;
        /* 使用變數化的速度與 easing */
        transition: opacity var(--jk-menu-duration) var(--jk-menu-ease), transform var(--jk-menu-duration) var(--jk-menu-ease), visibility var(--jk-menu-duration) var(--jk-menu-ease);
    }

        .jk-menu.is-open {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
            transition: opacity var(--jk-menu-duration) var(--jk-menu-ease), transform var(--jk-menu-duration) var(--jk-menu-ease), visibility var(--jk-menu-duration) var(--jk-menu-ease);
        }

    .jk-link {
        padding: 0;
        font-size: 1.5rem;
        line-height: 1.6;
        text-align: center;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        border-bottom: none;
        opacity: 0;
        /* 改為垂直進場，讓出/收更直覺 */
        transform: translateY(-18px);
        transition: opacity calc(var(--jk-menu-duration) / 2) var(--jk-menu-ease), transform calc(var(--jk-menu-duration) / 2) var(--jk-menu-ease);
    }

    /* 開啟時各項由上往下依序出現 */
    .jk-menu.is-open .jk-link {
        animation: slideInLink var(--jk-menu-duration) var(--jk-menu-ease) forwards;
    }

    .jk-link.is-active::after {
        width: 100%;
    }

    .jk-menu.is-open .jk-link:nth-child(1) {
        animation-delay: calc(var(--jk-initial-delay) + var(--jk-stagger) * 0);
    }

    .jk-menu.is-open .jk-link:nth-child(2) {
        animation-delay: calc(var(--jk-initial-delay) + var(--jk-stagger) * 1);
    }

    .jk-menu.is-open .jk-link:nth-child(3) {
        animation-delay: calc(var(--jk-initial-delay) + var(--jk-stagger) * 2);
    }

    .jk-menu.is-open .jk-link:nth-child(4) {
        animation-delay: calc(var(--jk-initial-delay) + var(--jk-stagger) * 3);
    }

    .jk-menu.is-open .jk-link:nth-child(5) {
        animation-delay: calc(var(--jk-initial-delay) + var(--jk-stagger) * 4);
    }

    .jk-menu.is-open .jk-link:nth-child(6) {
        animation-delay: calc(var(--jk-initial-delay) + var(--jk-stagger) * 5);
    }
}

@keyframes slideInLink {
    from {
        opacity: 0;
        transform: translateY(-18px);
    }

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

/* 收回時連結從下到上依序淡出並向右移動 */
@keyframes slideOutLink {
    from {
        opacity: 1;
        transform: translateY(0);
    }

    to {
        opacity: 0;
        transform: translateY(-18px);
    }
}

@media (max-width: 640px) {
    /* 收合時先讓連結反向播放（reverse），使用較慢的速度讓文字收回更明顯 */
    .jk-menu.is-closing .jk-link {
        animation: slideInLink var(--jk-close-duration) var(--jk-menu-ease) reverse forwards;
    }
        /* 反序延遲：讓底部的連結先消失 */
        .jk-menu.is-closing .jk-link:nth-child(6) {
            animation-delay: calc(var(--jk-stagger) * 0);
        }

        .jk-menu.is-closing .jk-link:nth-child(5) {
            animation-delay: calc(var(--jk-stagger) * 1);
        }

        .jk-menu.is-closing .jk-link:nth-child(4) {
            animation-delay: calc(var(--jk-stagger) * 2);
        }

        .jk-menu.is-closing .jk-link:nth-child(3) {
            animation-delay: calc(var(--jk-stagger) * 3);
        }

        .jk-menu.is-closing .jk-link:nth-child(2) {
            animation-delay: calc(var(--jk-stagger) * 4);
        }

        .jk-menu.is-closing .jk-link:nth-child(1) {
            animation-delay: calc(var(--jk-stagger) * 5);
        }

    /* 在連結收回期間，container 不移動，等文字完全收回後才快速直接收起 */

    /* 背景板直接快速收回（無拖移，文字消失後瞬間滑離） */
    .jk-menu.is-closing-container {
        opacity: 0;
        visibility: hidden;
        transform: translateY(-100%);
        transition: opacity var(--jk-container-close) ease-out, transform var(--jk-container-close) ease-out, visibility var(--jk-container-close);
    }
}

/* subtle overlay to darken page behind the menu like Apple store */
.jk-nav::after {
    content: "";
    position: fixed;
    inset: 0;
    background: var(--jk-overlay);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--jk-menu-duration) var(--jk-menu-ease);
    z-index: 1000; /* behind .jk-nav.menu-open (1001) so nav remains above */
}

.jk-nav.menu-open::after {
    opacity: 1;
}