/* ============================================
   CPM Category Dropdown - Frontend CSS v6
   
   Z-INDEX 層級：
   手機: 頁首(自有) > 選單(100001) > 遮罩blur(100000) > 頁面
   桌機: 頁首(自有) > 選單(999, 不穿過header) > 頁面
   
   Nav 完全不設 z-index / position
   ============================================ */

:root {
    --cpm-dd-radius: 8px;
    --cpm-dd-bg: #ffffff;
    --cpm-dd-text: #333333;
    --cpm-dd-hover-bg: #f0f7ff;
    --cpm-dd-hover-text: #0066cc;
    --cpm-dd-icon-size: 20px;
    --cpm-dd-font-size: 14px;
    --cpm-dd-menu-width: 220px;
    --cpm-dd-shadow: 0 8px 32px rgba(0,0,0,0.12);
}

/* ---- Nav (不設 position / z-index) ---- */
.cpm-cat-dropdown-nav {
    width: 100%;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans TC", "Microsoft JhengHei", sans-serif;
    -webkit-tap-highlight-color: transparent;
}

.cpm-cat-dropdown-nav *,
.cpm-cat-dropdown-nav *::before,
.cpm-cat-dropdown-nav *::after {
    box-sizing: border-box;
}

.cpm-cat-dropdown-wrapper {
    max-width: var(--theme-content-max-width, var(--ct-container-max-width, 1290px));
    margin: 0 auto;
    padding: 0;
}

.cpm-cat-dropdown-menu {
    list-style: none;
    margin: 0;
    padding: 12px 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.cpm-cat-dropdown-item {
    list-style: none;
    flex: 1 1 calc(50% - 4px);
    max-width: calc(50% - 4px);
    min-width: 0;
}

/* ---- Trigger Button ---- */
.cpm-cat-dropdown-trigger {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    width: 100%;
    padding: 10px 12px;
    border: 1.5px solid rgba(0,0,0,0.1);
    border-radius: var(--cpm-dd-radius);
    background: var(--cpm-dd-bg);
    color: var(--cpm-dd-text);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    line-height: 1.3;
    font-family: inherit;
    transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s;
    min-height: 44px;
    position: relative;
    overflow: hidden;
    touch-action: manipulation;
    -webkit-user-select: none;
    user-select: none;
}

.cpm-cat-dropdown-trigger:active {
    transform: scale(0.97);
    background: var(--cpm-dd-hover-bg);
}

.cpm-cat-dropdown-trigger[aria-expanded="true"] {
    background: var(--cpm-dd-hover-bg);
    color: var(--cpm-dd-hover-text);
    border-color: var(--cpm-accent, #4A90D9);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.cpm-trigger-icon {
    font-size: 16px !important;
    width: 16px !important;
    height: 16px !important;
    line-height: 1 !important;
    color: var(--cpm-accent, #4A90D9);
    flex-shrink: 0;
}

.cpm-trigger-text {
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
}

.cpm-trigger-arrow {
    font-size: 11px !important;
    width: 11px !important;
    height: 11px !important;
    line-height: 1 !important;
    opacity: 0.4;
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.cpm-cat-dropdown-trigger[aria-expanded="true"] .cpm-trigger-arrow {
    transform: rotate(180deg);
    opacity: 0.7;
}

/* ================================================
   BACKDROP (手機專用，桌機隱藏)
   z-index: 100000
   ================================================ */
#cpm-dd-backdrop {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 100000;
    background: rgba(0,0,0,0.4);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

#cpm-dd-backdrop.cpm-backdrop-visible {
    opacity: 1;
    visibility: visible;
}

/* 桌機完全不顯示遮罩 */
@media (min-width: 769px) {
    #cpm-dd-backdrop {
        display: none !important;
    }
}

/* ================================================
   SUBMENU - 手機預設：底部面板
   z-index: 100001 (由 JS inline 設定)
   ================================================ */
.cpm-cat-submenu {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100001;
    transform: translateY(100%);
    transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1);
    max-height: 75vh;
    pointer-events: none;
}

.cpm-cat-submenu.cpm-submenu-visible {
    transform: translateY(0);
    pointer-events: auto;
}

.cpm-submenu-inner {
    background: var(--cpm-dd-bg);
    border-radius: 20px 20px 0 0;
    box-shadow: 0 -4px 30px rgba(0,0,0,0.18);
    padding: 0;
    padding-bottom: calc(env(safe-area-inset-bottom, 20px) + 60px);
    overflow: hidden;
    max-height: 75vh;
    display: flex;
    flex-direction: column;
}

.cpm-sheet-handle {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 0 4px;
    cursor: grab;
    flex-shrink: 0;
}

.cpm-sheet-handle-bar {
    width: 36px;
    height: 4px;
    border-radius: 2px;
    background: #d0d0d0;
}

.cpm-sheet-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 20px 14px;
    border-bottom: 1px solid rgba(0,0,0,0.06);
    flex-shrink: 0;
}

.cpm-sheet-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 17px;
    font-weight: 700;
    color: var(--cpm-dd-text);
}

.cpm-sheet-title-icon {
    font-size: 20px !important;
    width: 20px !important;
    height: 20px !important;
    color: var(--cpm-accent, #4A90D9);
}

.cpm-sheet-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border: none;
    background: #f0f0f0;
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    color: #666;
    transition: background 0.15s;
    touch-action: manipulation;
    line-height: 1;
}

.cpm-sheet-close:active {
    background: #ddd;
}

.cpm-sheet-content {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    padding: 8px 12px 16px;
    flex: 1;
}

/* ---- Submenu Links ---- */
.cpm-submenu-link {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    color: var(--cpm-dd-text);
    text-decoration: none;
    border-radius: 14px;
    font-size: 15px;
    transition: background 0.15s ease;
    min-height: 52px;
    -webkit-user-select: none;
    user-select: none;
    touch-action: manipulation;
}

.cpm-submenu-link:active {
    background: var(--cpm-dd-hover-bg);
    color: var(--cpm-dd-hover-text);
}

.cpm-submenu-link:hover {
    text-decoration: none;
    color: var(--cpm-dd-text);
}

.cpm-submenu-link + .cpm-submenu-link {
    border-top: 1px solid rgba(0,0,0,0.04);
}

.cpm-submenu-icon {
    font-size: 22px !important;
    width: 22px !important;
    height: 22px !important;
    line-height: 1 !important;
    flex-shrink: 0;
    color: var(--cpm-accent, #999);
}

.cpm-submenu-icon-img {
    width: 28px;
    height: 28px;
    object-fit: contain;
    flex-shrink: 0;
    border-radius: 6px;
}

.cpm-submenu-text {
    flex: 1;
    font-weight: 500;
    line-height: 1.3;
}

/* ================================================
   SMALL PHONE (< 380px)
   ================================================ */
@media (max-width: 380px) {
    .cpm-cat-dropdown-wrapper { padding: 0; }
    .cpm-cat-dropdown-menu { gap: 6px; padding: 10px 0; }
    .cpm-cat-dropdown-trigger { padding: 8px 10px; font-size: 12px; min-height: 40px; gap: 4px; }
    .cpm-trigger-icon { font-size: 14px!important; width: 14px!important; height: 14px!important; }
    .cpm-trigger-arrow { font-size: 10px!important; width: 10px!important; height: 10px!important; }
    .cpm-submenu-link { padding: 12px 14px; font-size: 14px; gap: 12px; min-height: 48px; }
}

/* ================================================
   TABLET (481px - 768px)
   ================================================ */
@media (min-width: 481px) and (max-width: 768px) {
    .cpm-cat-dropdown-wrapper { padding: 0; }
    .cpm-cat-dropdown-menu { gap: 10px; padding: 14px 0; }
    .cpm-cat-dropdown-item { flex: 1 1 calc(33.33% - 7px); max-width: calc(33.33% - 7px); }
    .cpm-cat-dropdown-trigger { padding: 11px 16px; font-size: 14px; }
}

/* ================================================
   DESKTOP (769px+)
   ================================================ */
@media (min-width: 769px) {

    .cpm-cat-dropdown-nav {
        padding: 16px 0;
    }

    .cpm-cat-dropdown-wrapper {
        padding: 0;
    }

    .cpm-style-horizontal .cpm-cat-dropdown-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 12px;
        padding: 0;
    }

    .cpm-style-horizontal .cpm-cat-dropdown-item {
        flex: 1 1 0;
        max-width: none;
        min-width: 0;
    }

    .cpm-style-vertical .cpm-cat-dropdown-menu {
        flex-direction: column;
        gap: 4px;
        max-width: 300px;
        padding: 0;
    }

    .cpm-style-vertical .cpm-cat-dropdown-item {
        flex: 0 0 auto;
        max-width: none;
    }

    .cpm-cat-dropdown-trigger {
        display: flex;
        width: 100%;
        padding: 12px 28px;
        border-radius: var(--cpm-dd-radius);
        border-width: 2px;
        font-size: 15px;
        justify-content: center;
        gap: 8px;
    }

    .cpm-cat-dropdown-trigger:hover,
    .cpm-cat-dropdown-trigger:focus,
    .cpm-cat-dropdown-trigger[aria-expanded="true"] {
        background: var(--cpm-dd-hover-bg);
        color: var(--cpm-dd-hover-text);
        border-color: var(--cpm-accent, #4A90D9);
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    }

    .cpm-cat-dropdown-trigger:active {
        transform: translateY(0);
    }

    .cpm-trigger-icon {
        font-size: 20px !important;
        width: 20px !important;
        height: 20px !important;
    }

    .cpm-trigger-arrow {
        font-size: 14px !important;
        width: 14px !important;
        height: 14px !important;
        margin-left: 2px;
    }

    /* 桌機版 submenu: JS 會用 inline style 設 position:fixed + 座標
       CSS 只控制顯示/隱藏動畫 */
    /* 桌機：li 設 relative，submenu absolute 在下方 */
    .cpm-cat-dropdown-item {
        position: relative;
    }

    .cpm-cat-submenu {
        position: absolute;
        top: 100%;
        left: 0;
        margin-top: 6px;
        z-index: 49;
        transform: none;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.2s ease, visibility 0.2s ease;
        width: auto;
        min-width: 220px;
        max-width: 320px;
    }

    .cpm-cat-submenu.cpm-submenu-visible {
        opacity: 1;
        visibility: visible;
        transform: none;
    }

    .cpm-submenu-inner {
        border-radius: var(--cpm-dd-radius);
        box-shadow: var(--cpm-dd-shadow);
        border: 1px solid rgba(0,0,0,0.06);
        padding: 8px;
        padding-bottom: 8px;
        max-height: 400px;
        overflow-y: auto;
        overscroll-behavior: contain;
        background: var(--cpm-dd-bg);
    }

    .cpm-sheet-handle,
    .cpm-sheet-header {
        display: none;
    }

    .cpm-sheet-content {
        overflow: visible;
        padding: 0;
    }

    .cpm-submenu-link {
        gap: 10px;
        padding: 11px 16px;
        border-radius: calc(var(--cpm-dd-radius) - 2px);
        font-size: 14px;
        min-height: auto;
    }

    .cpm-submenu-link:hover {
        background: var(--cpm-dd-hover-bg);
        color: var(--cpm-dd-hover-text);
        padding-left: 20px;
    }

    .cpm-submenu-link:hover .cpm-submenu-icon {
        color: var(--cpm-accent, var(--cpm-dd-hover-text));
    }

    .cpm-submenu-icon {
        font-size: var(--cpm-dd-icon-size) !important;
        width: var(--cpm-dd-icon-size) !important;
        height: var(--cpm-dd-icon-size) !important;
    }

    .cpm-submenu-icon-img {
        width: var(--cpm-dd-icon-size);
        height: var(--cpm-dd-icon-size);
        border-radius: 4px;
    }
}

/* ================================================
   ACCESSIBILITY / MOTION / PRINT
   ================================================ */
.cpm-cat-dropdown-trigger:focus-visible,
.cpm-submenu-link:focus-visible {
    outline: 2px solid var(--cpm-accent, #4A90D9);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    .cpm-cat-dropdown-trigger,
    .cpm-cat-submenu,
    .cpm-submenu-link {
        transition: none !important;
    }
}

@media print {
    .cpm-cat-dropdown-nav { display: none; }
}