/* ==========================================================================
   PALM TREE WORKSHOPS — Burger / Overlay Menu CSS
   Full-screen olive-green overlay. Left: nav links. Right: sub-items.
   Reference: onlab.ch two-column expand pattern.
   ========================================================================== */

/* ──────────────────────────────────────────────
   OVERLAY WRAPPER
────────────────────────────────────────────── */
.ptw-menu-overlay {
    position: fixed;
    inset: 0;
    z-index: 950;
    background-color: var(--ptw-green);
    color: var(--ptw-white);

    display: grid;
    grid-template-rows: var(--ptw-header-height) 1fr;
    grid-template-columns: 1fr 1fr;

    /* Hidden state */
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity var(--ptw-duration-slow) var(--ptw-ease),
                visibility var(--ptw-duration-slow) var(--ptw-ease),
                transform var(--ptw-duration-slow) var(--ptw-ease);
    pointer-events: none;
}

.ptw-menu-overlay.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: all;
}


/* ──────────────────────────────────────────────
   CLOSE BUTTON (top-right, inside overlay)
────────────────────────────────────────────── */
.ptw-menu-close {
    position: absolute;
    top: calc( (var(--ptw-header-height) - 32px) / 2 );
    right: var(--ptw-gap-md);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--ptw-white);
    background: none;
    border: none;
    cursor: pointer;
    opacity: 0.8;
    transition: opacity var(--ptw-duration) var(--ptw-ease);
}

.ptw-menu-close:hover {
    opacity: 1;
}


/* ──────────────────────────────────────────────
   MENU LOGO (top-left, inside overlay)
────────────────────────────────────────────── */
.ptw-menu-logo {
    position: absolute;
    top: calc( (var(--ptw-header-height) - 32px) / 2 );
    left: var(--ptw-gap-md);
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--ptw-white);
    text-decoration: none;
}

.ptw-menu-logo img,
.ptw-menu-logo svg {
    width: 28px;
    height: 28px;
    filter: brightness(0) invert(1);
}

.ptw-menu-logo__text {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: var(--ptw-tracking-wide);
    text-transform: uppercase;
    line-height: 1.3;
}


/* ──────────────────────────────────────────────
   NAV AREA (left column, starts below header row)
────────────────────────────────────────────── */
.ptw-menu-nav {
    grid-column: 1 / 2;
    grid-row: 2 / 3;
    padding: var(--ptw-gap-lg) var(--ptw-gap-md);
    display: flex;
    align-items: flex-start;
    overflow-y: auto;
}

.ptw-overlay-nav-list {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0;
}


/* ──────────────────────────────────────────────
   NAV ITEMS
────────────────────────────────────────────── */
.ptw-nav-item {
    border-bottom: 1px solid rgba(255,255,255,0.12);
}

.ptw-nav-item:first-child {
    border-top: 1px solid rgba(255,255,255,0.12);
}

.ptw-nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0;
    font-size: var(--ptw-text-md);
    font-weight: 400;
    color: rgba(255,255,255,0.55);
    text-decoration: none;
    transition: color var(--ptw-duration) var(--ptw-ease);
    cursor: pointer;
}

.ptw-nav-link:hover,
.ptw-nav-item.is-active > .ptw-nav-link {
    color: var(--ptw-white);
    opacity: 1;
}

/* Arrow indicator for expandable items */
.ptw-nav-arrow {
    font-size: var(--ptw-text-md);
    opacity: 0.5;
    transition: transform var(--ptw-duration) var(--ptw-ease),
                opacity var(--ptw-duration) var(--ptw-ease);
    display: inline-block;
    margin-left: var(--ptw-gap-sm);
}

.ptw-nav-item.is-active .ptw-nav-arrow {
    transform: rotate(90deg);
    opacity: 1;
}


/* ──────────────────────────────────────────────
   SUB-MENU (right column — workshop list)
────────────────────────────────────────────── */
.ptw-menu-submenu-panel {
    grid-column: 2 / 3;
    grid-row: 2 / 3;
    padding: var(--ptw-gap-lg) var(--ptw-gap-md);
    border-left: 1px solid rgba(255,255,255,0.12);
    overflow-y: auto;

    /* Hidden by default, shown when a parent item is active */
    opacity: 0;
    transform: translateX(12px);
    transition: opacity var(--ptw-duration) var(--ptw-ease),
                transform var(--ptw-duration) var(--ptw-ease);
    pointer-events: none;
}

.ptw-menu-submenu-panel.is-visible {
    opacity: 1;
    transform: translateX(0);
    pointer-events: all;
}

.ptw-submenu {
    display: flex;
    flex-direction: column;
    gap: var(--ptw-gap-sm);
    list-style: none;
}

.ptw-submenu li a {
    font-size: var(--ptw-text-sm);
    color: rgba(255,255,255,0.65);
    line-height: var(--ptw-leading-body);
    transition: color var(--ptw-duration) var(--ptw-ease);
}

.ptw-submenu li a:hover {
    color: var(--ptw-white);
    opacity: 1;
}

/* Separator between sections in submenu (e.g. Upcoming → Past) */
.ptw-submenu__section-label {
    font-size: var(--ptw-text-xs);
    font-weight: 700;
    letter-spacing: var(--ptw-tracking-xwide);
    text-transform: uppercase;
    color: rgba(255,255,255,0.35);
    margin-top: var(--ptw-gap-md);
    margin-bottom: var(--ptw-gap-xs);
}

.ptw-submenu__section-label:first-child {
    margin-top: 0;
}


/* ──────────────────────────────────────────────
   STAGGER ANIMATION — nav items
────────────────────────────────────────────── */
.ptw-nav-item {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.3s var(--ptw-ease),
                transform 0.3s var(--ptw-ease),
                border-color 0s;
}

.ptw-menu-overlay.is-open .ptw-nav-item {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delays — JS also sets these via dataset */
.ptw-menu-overlay.is-open .ptw-nav-item:nth-child(1)  { transition-delay: 0.05s; }
.ptw-menu-overlay.is-open .ptw-nav-item:nth-child(2)  { transition-delay: 0.10s; }
.ptw-menu-overlay.is-open .ptw-nav-item:nth-child(3)  { transition-delay: 0.15s; }
.ptw-menu-overlay.is-open .ptw-nav-item:nth-child(4)  { transition-delay: 0.20s; }
.ptw-menu-overlay.is-open .ptw-nav-item:nth-child(5)  { transition-delay: 0.25s; }
.ptw-menu-overlay.is-open .ptw-nav-item:nth-child(6)  { transition-delay: 0.30s; }
.ptw-menu-overlay.is-open .ptw-nav-item:nth-child(7)  { transition-delay: 0.35s; }
.ptw-menu-overlay.is-open .ptw-nav-item:nth-child(8)  { transition-delay: 0.40s; }
.ptw-menu-overlay.is-open .ptw-nav-item:nth-child(9)  { transition-delay: 0.45s; }


/* ──────────────────────────────────────────────
   RESPONSIVE — single column on mobile
────────────────────────────────────────────── */
@media (max-width: 768px) {
    .ptw-menu-overlay {
        grid-template-columns: 1fr;
    }
    .ptw-menu-nav {
        grid-column: 1 / 2;
    }
    .ptw-menu-submenu-panel {
        display: none; /* Sub-menu shown inline on mobile */
    }
    .ptw-submenu {
        padding-left: var(--ptw-gap-md);
        display: none;
    }
    .ptw-nav-item.is-active .ptw-submenu {
        display: flex;
    }
    .ptw-nav-link {
        font-size: var(--ptw-text-base);
    }
}