/* ============================================
   CRYSTAL FACILITY SOLUTIONS - NAVIGATION
   Premium Glassmorphic Nav with Transparent Mobile Dropdown
   ============================================ */

/* ============================================
   MAIN NAVIGATION BAR
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: transparent;
    backdrop-filter: blur(0px);
    z-index: var(--z-nav);
    transition: all var(--transition-slow) var(--ease-in-out);
    border-bottom: 1px solid transparent;
}

.nav::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0.4) 0%, transparent 100%);
    opacity: 1;
    transition: opacity var(--transition-slow) ease;
    pointer-events: none;
}

.nav.scrolled {
    height: var(--nav-height-scrolled);
    background: rgba(16, 26, 42, 0.72);
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    border-bottom-color: rgba(124, 179, 66, 0.25);
    box-shadow:
        0 4px 30px rgba(0, 0, 0, 0.25),
        0 0 40px rgba(124, 179, 66, 0.08);
}

.nav.scrolled::before {
    opacity: 0;
}

.nav-content {
    max-width: var(--container-max-width-lg);
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 2;
}

/* ============================================
   LOGO
   ============================================ */
.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    position: relative;
    transition: transform var(--transition-fast) ease;
}

.logo:hover {
    transform: scale(1.05);
}

.logo img {
    height: 82px;
    width: auto;
    display: block;
    filter: drop-shadow(0 0 20px rgba(124, 179, 66, 0.3));
    transition: all var(--transition-fast) ease;
}

.nav.scrolled .logo img {
    height: 48px;
    filter: drop-shadow(0 0 15px rgba(124, 179, 66, 0.5));
}

.logo::after {
    content: '';
    position: absolute;
    inset: -10px;
    background: radial-gradient(circle, rgba(124, 179, 66, 0.3) 0%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-fast) ease;
    z-index: -1;
    filter: blur(10px);
}

.logo:hover::after {
    opacity: 1;
}

/* ============================================
   DESKTOP NAV LINKS
   ============================================ */
.nav-links {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    margin: 0;
    padding: 0;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.9);
    font-weight: var(--font-weight-medium);
    font-size: 0.95rem;
    padding: 0.6rem 1.2rem;
    border-radius: var(--border-radius-full);
    transition: all var(--transition-fast) var(--ease-in-out);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.02em;
}

.nav-links a::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
                rgba(124, 179, 66, 0.3) 0%,
                transparent 60%);
    opacity: 0;
    transition: opacity var(--transition-fast) ease;
}

.nav-links a:hover::before {
    opacity: 1;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--cfs-green), transparent);
    transition: all var(--transition-fast) ease;
    transform: translateX(-50%);
    box-shadow: 0 0 10px var(--cfs-green);
}

.nav-links a:hover,
.nav-links a:focus-visible {
    color: var(--white);
    transform: translateY(-2px);
    text-shadow: 0 0 20px rgba(124, 179, 66, 0.5);
}

.nav-links a:hover::after,
.nav-links a:focus-visible::after {
    width: 80%;
}

.nav-links a.active {
    background: rgba(124, 179, 66, 0.15);
    border: 1px solid rgba(124, 179, 66, 0.4);
    color: var(--cfs-green);
    font-weight: var(--font-weight-semibold);
}

.nav-links a.active::after {
    display: none;
}

/* ============================================
   NAV DROPDOWN MENU
   ============================================ */
.nav-dropdown {
    position: relative;
}

.dropdown-trigger {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.9);
    font-weight: var(--font-weight-medium);
    font-size: 0.95rem;
    padding: 0.6rem 1.2rem;
    border-radius: var(--border-radius-full);
    cursor: pointer;
    font-family: inherit;
    letter-spacing: 0.02em;
    transition: all var(--transition-fast) var(--ease-in-out);
    position: relative;
    overflow: hidden;
}

.dropdown-trigger:hover,
.dropdown-trigger:focus-visible {
    color: var(--white);
    transform: translateY(-2px);
    text-shadow: 0 0 20px rgba(124, 179, 66, 0.5);
}

.dropdown-trigger::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--cfs-green), transparent);
    transition: all var(--transition-fast) ease;
    transform: translateX(-50%);
    box-shadow: 0 0 10px var(--cfs-green);
}

.dropdown-trigger:hover::after,
.dropdown-trigger:focus-visible::after {
    width: 80%;
}

.dropdown-arrow {
    font-size: 0.7rem;
    transition: transform 0.3s ease;
    opacity: 0.7;
}

/* Show dropdown on hover OR when expanded */
.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu,
.dropdown-trigger[aria-expanded="true"] ~ .dropdown-menu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}

.nav-dropdown:hover .dropdown-arrow,
.nav-dropdown:focus-within .dropdown-arrow,
.dropdown-trigger[aria-expanded="true"] .dropdown-arrow {
    transform: rotate(180deg);
    opacity: 1;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    min-width: 200px;
    background: rgba(16, 26, 42, 0.95);
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    border: 1px solid rgba(124, 179, 66, 0.25);
    border-radius: 12px;
    padding: 0.5rem;
    list-style: none;
    margin: 0;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all 0.3s ease;
    box-shadow:
        0 10px 40px rgba(0, 0, 0, 0.4),
        0 0 30px rgba(124, 179, 66, 0.1);
    z-index: 1000;
}

/* Dropdown caret arrow */
.dropdown-menu::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 50%;
    transform: translateX(-50%) rotate(45deg);
    width: 12px;
    height: 12px;
    background: rgba(16, 26, 42, 0.95);
    border-top: 1px solid rgba(124, 179, 66, 0.25);
    border-left: 1px solid rgba(124, 179, 66, 0.25);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: 0.75rem 1.25rem;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.3s ease;
    white-space: nowrap;
    text-decoration: none;
    position: relative;
}

.dropdown-menu a:hover,
.dropdown-menu a:focus-visible {
    background: rgba(124, 179, 66, 0.15);
    color: var(--cfs-green);
    transform: translateX(4px);
}

.dropdown-menu a.active {
    background: rgba(124, 179, 66, 0.2);
    color: var(--cfs-green);
    font-weight: 600;
}

/* Left green accent bar */
.dropdown-menu a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 0;
    height: 50%;
    background: var(--cfs-green);
    transition: width 0.3s ease;
    transform: translateY(-50%);
    border-radius: 0 3px 3px 0;
}

.dropdown-menu a:hover::before,
.dropdown-menu a:focus-visible::before,
.dropdown-menu a.active::before {
    width: 3px;
}

/* ============================================
   NAV CTA BUTTON
   ============================================ */
.nav-cta {
    margin-left: var(--spacing-4);
    padding: 0.7rem 1.5rem;
    background: linear-gradient(135deg, var(--cfs-green), var(--cfs-dark-green));
    border: none;
    border-radius: var(--border-radius-full);
    color: var(--white);
    font-weight: var(--font-weight-semibold);
    font-size: 0.9rem;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-fast) ease;
    box-shadow: 0 4px 15px rgba(124, 179, 66, 0.3);
}

.nav-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transform: translateX(-100%);
    transition: transform var(--transition-slow) ease;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(124, 179, 66, 0.4);
}

.nav-cta:hover::before {
    transform: translateX(100%);
}

/* ============================================
   MOBILE MENU BUTTON (HAMBURGER)
   ============================================ */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    width: 48px;
    height: 48px;
    padding: 0;
    cursor: pointer;
    position: relative;
    z-index: calc(var(--z-nav) + 2);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-fast) ease;
}

.mobile-menu-btn:hover {
    background: rgba(124, 179, 66, 0.1);
}

.mobile-menu-btn:focus-visible {
    box-shadow: var(--focus-ring);
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--white);
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    transition: all var(--transition-fast) var(--ease-in-out);
    box-shadow: 0 0 10px rgba(124, 179, 66, 0.5);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--white);
    left: 50%;
    transform: translateX(-50%);
    transition: all var(--transition-fast) var(--ease-in-out);
    box-shadow: 0 0 10px rgba(124, 179, 66, 0.5);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

/* Hamburger → X Animation */
.mobile-menu-btn[aria-expanded="true"] .hamburger {
    background: transparent;
    box-shadow: none;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger::before {
    top: 0;
    transform: translateX(-50%) rotate(45deg);
}

.mobile-menu-btn[aria-expanded="true"] .hamburger::after {
    top: 0;
    transform: translateX(-50%) rotate(-45deg);
}

/* ============================================
   MOBILE NAVIGATION - TRANSPARENT DROPDOWN
   ============================================
   CRITICAL: Container uses pointer-events: none
   so clicks pass through to page. Only children
   (links/buttons) catch clicks via pointer-events: auto.
   ============================================ */
.mobile-nav {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: transparent;
    z-index: calc(var(--z-nav) - 1);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1.5rem var(--container-padding) 2rem;
    /* Let clicks pass through empty space */
    pointer-events: none;
    /* Animation */
    transform: translateY(-20px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast) ease;
}

/* Adjust position when nav is scrolled */
.nav.scrolled ~ .mobile-nav {
    top: var(--nav-height-scrolled);
}

/* Open state */
.mobile-nav.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    /* Container still doesn't catch clicks */
    pointer-events: none;
}

/* Mobile nav items - glassmorphic cards with stronger blur */
.mobile-nav a,
.mobile-nav .btn-primary {
    /* Items DO catch clicks */
    pointer-events: auto;
    font-size: 1.1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--white);
    text-decoration: none;
    padding: 1rem 3rem;
    width: 100%;
    max-width: 280px;
    text-align: center;
    border-radius: var(--border-radius-xl);
    /* Stronger background + blur for readability over busy images */
    background: rgba(10, 22, 40, 0.75);
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.08);
    transition: all var(--transition-fast) ease;
    opacity: 0;
    transform: translateY(-10px);
    position: relative;
}

/* Staggered entrance animation */
.mobile-nav.active a,
.mobile-nav.active .btn-primary {
    opacity: 1;
    transform: translateY(0);
}

.mobile-nav a:nth-child(1) { transition-delay: 0.05s; }
.mobile-nav a:nth-child(2) { transition-delay: 0.1s; }
.mobile-nav a:nth-child(3) { transition-delay: 0.15s; }
.mobile-nav a:nth-child(4) { transition-delay: 0.2s; }
.mobile-nav a:nth-child(5) { transition-delay: 0.25s; }

/* Hover / Active states */
.mobile-nav a:hover,
.mobile-nav a:focus,
.mobile-nav a.active {
    color: var(--cfs-green);
    background: rgba(16, 30, 50, 0.9);
    border-color: rgba(124, 179, 66, 0.4);
    box-shadow:
        0 8px 32px rgba(124, 179, 66, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Left green accent bar */
.mobile-nav a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 0;
    height: 50%;
    background: var(--cfs-green);
    transition: width var(--transition-fast) ease;
    transform: translateY(-50%);
    border-radius: 0 3px 3px 0;
    box-shadow: 0 0 10px var(--cfs-green);
}

.mobile-nav a:hover::before,
.mobile-nav a:focus::before,
.mobile-nav a.active::before {
    width: 4px;
}

/* Mobile CTA Button */
.mobile-nav .btn-primary {
    margin-top: 0.5rem;
    color: var(--white);
    background: rgba(10, 22, 40, 0.85);
    border: 1px solid rgba(124, 179, 66, 0.3);
    border-radius: var(--border-radius-full);
    cursor: pointer;
    transition-delay: 0.3s;
    box-shadow:
        0 4px 20px rgba(124, 179, 66, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.mobile-nav .btn-primary:hover {
    background: rgba(16, 35, 55, 0.95);
    border-color: rgba(124, 179, 66, 0.5);
    box-shadow:
        0 8px 32px rgba(124, 179, 66, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .nav {
        height: var(--nav-height-scrolled);
    }

    .nav-links,
    .nav-cta,
    .dropdown-menu {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .logo img {
        height: 60px;
    }

    .mobile-nav {
        top: var(--nav-height-scrolled);
        padding: 1.25rem 1.5rem 1.5rem;
    }

    .mobile-nav a,
    .mobile-nav .btn-primary {
        font-size: var(--font-size-base);
        padding: 0.875rem 2.5rem;
        max-width: 260px;
    }
}

/* ============================================
   REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    .nav,
    .nav::before,
    .logo,
    .logo img,
    .nav-links a,
    .nav-cta,
    .hamburger,
    .hamburger::before,
    .hamburger::after,
    .mobile-nav,
    .mobile-nav a,
    .mobile-nav .btn-primary {
        transition: none !important;
        animation: none !important;
    }

    .mobile-nav a,
    .mobile-nav .btn-primary {
        opacity: 1;
        transform: none;
    }
}

/* ============================================
   HIGH CONTRAST MODE
   ============================================ */
@media (prefers-contrast: high) {
    .nav.scrolled {
        background: var(--dark);
        border-bottom-color: var(--cfs-green);
    }

    .mobile-nav a,
    .mobile-nav .btn-primary {
        border-width: 2px;
    }

    .nav-links a.active {
        border-width: 2px;
    }
}