/* assets/css/header.css */

/* Sticky Header Backdrop */
.glass-header {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all 0.3s ease;
}

.glass-header.scrolled {
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    background-color: rgba(255, 255, 255, 0.95);
}

.glass-header.scrolled .header-inner {
    height: 3.5rem; /* ~ h-14 */
}

/* Nav Item Hover State */
.nav-link {
    position: relative;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.2s ease;
}

.nav-link:hover {
    background-color: rgba(var(--p), 0.05);
    color: var(--p);
}

/* Shared Dropdown Viewport */
.dropdown-viewport {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    width: auto;
    height: auto;
    background: white;
    border-radius: 1rem;
    box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    border: 1px border-slate-100;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(10px) scale(0.95);
    transition: transform 0.3s cubic-bezier(0.2, 1, 0.2, 1), 
                opacity 0.2s ease, 
                left 0.3s cubic-bezier(0.2, 1, 0.2, 1),
                width 0.3s cubic-bezier(0.2, 1, 0.2, 1),
                height 0.3s cubic-bezier(0.2, 1, 0.2, 1);
    z-index: 100;
}

/* Mouse Bridge: tạo vùng đệm vô hình để chuột không bị "rời" khỏi menu khi di chuyển từ trên xuống */
.dropdown-viewport::before {
    content: '';
    position: absolute;
    top: -20px;
    left: 0;
    right: 0;
    height: 20px;
    background: transparent;
}

.dropdown-viewport.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0) scale(1);
}

.viewport-content {
    min-width: 250px;
    padding: 1rem;
    transition: opacity 0.2s ease;
}

.viewport-content.hidden {
    display: none;
}

/* Arrow indicator */
.viewport-arrow {
    position: absolute;
    top: -6px;
    left: 50%;
    transform: translateX(-50%) rotate(45deg);
    width: 12px;
    height: 12px;
    background: white;
    border-left: 1px solid rgba(0,0,0,0.05);
    border-top: 1px solid rgba(0,0,0,0.05);
    transition: left 0.3s cubic-bezier(0.2, 1, 0.2, 1);
}

/* Mobile Menu Fullscreen */
#mobile-menu-overlay {
    position: fixed;
    inset: 0;
    background: white;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-20px);
    transition: all 0.4s cubic-bezier(0.2, 1, 0.2, 1);
}

#mobile-menu-overlay.is-active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
}

.mobile-nav-item {
    border-bottom: 1px solid #f1f5f9;
}

.mobile-nav-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: #1e293b;
}

/* Animations */
@keyframes slideDown {
    from { transform: translateY(-10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.animate-slide-down {
    animation: slideDown 0.3s ease forwards;
}