/* =========================================================================
   2. 導覽列與選單 (NAV & DROPDOWN)
   ========================================================================= */
.header-nav-row { padding: 12px 0; }
nav { display: flex; justify-content: center; gap: 20px; align-items: center; flex-wrap: wrap; }

.nav-item-wrapper {
    position: relative;
    display: inline-block;
}

.nav-cat-btn { 
    background: none;
    border: none;
    outline: none;
    cursor: pointer;
    color: #515154; 
    font-weight: 500; 
    font-size: 15px; 
    padding: 6px 14px; 
    border-radius: 12px;
    display: inline-flex; 
    align-items: center;
    gap: 6px;
    transition: all 0.25s ease;
    text-decoration: none;
    font-family: inherit;
}

.nav-cat-btn:hover { 
    color: #0071e3; 
    background-color: transparent;
}

.nav-cat-btn .arrow-icon {
    font-size: 11px;
    color: #86868b;
    transition: transform 0.3s cubic-bezier(0.25, 1, 0.5, 1), color 0.3s ease;
}

.nav-item-wrapper.active .nav-cat-btn {
    color: #0071e3;
    background-color: transparent;
}

.nav-item-wrapper.active .arrow-icon {
    transform: rotate(180deg);
    color: #0071e3;
}

.nav-dropdown-card {
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(234, 234, 234, 0.9);
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    display: none;
    flex-direction: column;
    padding: 8px;
    min-width: 170px;
    opacity: 0;
    transition: opacity 0.25s ease, transform 0.25s ease;
    pointer-events: none;
}

.nav-dropdown-card.active {
    display: flex;
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.nav-main-all-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 9px 12px;
    border-radius: 10px;
    color: #0071e3;
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    border-bottom: 1px solid #f5f5f7;
    margin-bottom: 4px;
    transition: background-color 0.2s ease;
}

.nav-main-all-link:hover {
    background-color: #eef4fc;
}

.nav-sub-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    border-radius: 10px;
    color: #1d1d1f;
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.nav-sub-item:hover {
    background-color: #f5f5f7;
    color: #0071e3;
    font-weight: 500;
}

.nav-cat-btn span,
.nav-main-all-link span,
.nav-sub-item span {
    display: inline-block;
    position: relative;
    z-index: 2;
    transition: transform 0.2s cubic-bezier(0.25, 1, 0.5, 1), color 0.4s ease;
}

@media (hover: hover) {
    .icon-btn:hover i { color: #0071e3 !important; transform: scale(0.88) translateY(2px); }
    .nav-cat-btn:hover span,
    .nav-main-all-link:hover span,
    .nav-sub-item:hover span { color: #0071e3 !important; transform: scale(0.88) translateY(2px) !important; }
}

.icon-btn:active, .icon-btn.watermark-active { color: #0071e3 !important; }
.icon-btn:active i, .icon-btn.watermark-active i,
.nav-cat-btn:active span, .nav-cat-btn.watermark-active span,
.nav-main-all-link:active span, .nav-main-all-link.watermark-active span,
.nav-sub-item:active span, .nav-sub-item.watermark-active span {
    color: #0071e3 !important;
    transform: scale(0.88) translateY(2px) !important;
}