/* ===================================
   WORLD-CLASS NAVIGATION STYLES
   ================================= */

/* Enhanced Header */
.header {
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

    .header.scrolled {
        background: rgba(0, 0, 0, 0.95);
        border-bottom-color: rgba(255, 255, 255, 0.12);
    }

.header-container {
    max-width: 72rem;
    margin: 0 auto;
    padding: 0.75rem 1rem;
}

@media (min-width: 640px) {
    .header-container {
        padding: 0.75rem 1.5rem;
    }
}

.header-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Enhanced Logo */
.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
    transition: transform 0.2s ease;
}

    .logo:hover {
        transform: scale(1.02);
    }

.logo-img {
    height: 48px;
    width: auto;
}

/* Enhanced Desktop Navigation */
.desktop-nav {
    display: none;
    align-items: center;
    gap: 2rem;
}

@media (min-width: 768px) {
    .desktop-nav {
        display: flex;
    }
}

.nav-group {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-separator {
    width: 1px;
    height: 1.25rem;
    background: rgba(255, 255, 255, 0.1);
}

.nav-item {
    position: relative;
}

/* Enhanced Nav Links */
.nav-link {
    color: rgb(209, 213, 219);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    font-weight: 500;
    position: relative;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.875rem;
}

    .nav-link:hover {
        color: white;
        background: rgba(255, 255, 255, 0.05);
    }

    .nav-link:focus-visible {
        outline: 2px solid rgba(255, 255, 255, 0.6);
        outline-offset: 2px;
    }

    .nav-link .chevron {
        width: 1rem;
        height: 1rem;
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

.nav-item[data-open="true"] .chevron {
    transform: rotate(180deg);
}

/* World-Class Dropdown Menu - Consistent Width for All */
.dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    background: rgba(8, 8, 8, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 0.75rem;
    padding: 1.25rem;
    width: 38rem; /* Consistent width for all dropdowns */
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 1000;
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(255, 255, 255, 0.05), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.nav-item[data-open="true"] .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* Responsive dropdown sizing - consistent scaling */
@media (max-width: 1200px) {
    .dropdown-menu {
        width: 36rem;
    }
}

@media (max-width: 1024px) {
    .dropdown-menu {
        width: 32rem;
    }
}

@media (max-width: 768px) {
    .dropdown-menu {
        width: 28rem;
        left: 0;
        transform: translateX(0) translateY(-8px);
    }

    .nav-item[data-open="true"] .dropdown-menu {
        transform: translateX(0) translateY(0);
    }
}

@media (max-width: 640px) {
    .dropdown-menu {
        width: calc(100vw - 2rem);
        left: 1rem;
        right: 1rem;
    }
}

/* Grid layouts - flexible for different content */
.dropdown-grid {
    display: grid;
    gap: 2rem;
}

    /* Single column layout for simpler dropdowns */
    .dropdown-grid.single-column {
        grid-template-columns: 1fr;
    }

    /* Two column layout for complex dropdowns */
    .dropdown-grid.two-column {
        grid-template-columns: 1fr 1fr;
    }

    /* Three column layout for extensive dropdowns */
    .dropdown-grid.three-column {
        grid-template-columns: 1fr 1fr 1fr;
    }

/* Responsive grid adjustments */
@media (max-width: 768px) {
    .dropdown-grid.two-column,
    .dropdown-grid.three-column {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

.dropdown-section-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: white;
    margin-bottom: 0.75rem;
    letter-spacing: -0.025em;
    padding-bottom: 0.375rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.dropdown-links {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

/* Enhanced Dropdown Links */
.dropdown-link {
    color: rgb(156, 163, 175);
    text-decoration: none;
    font-size: 0.8rem;
    padding: 0.625rem 0.75rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    line-height: 1.3;
    display: block;
    border-radius: 0.5rem;
    position: relative;
    overflow: hidden;
}

    .dropdown-link::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
        opacity: 0;
        transition: opacity 0.3s ease;
    }

    .dropdown-link:hover::before {
        opacity: 1;
    }

    .dropdown-link:hover {
        color: white;
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    }

.dropdown-link-title {
    font-weight: 500;
    color: rgb(209, 213, 219);
    margin-bottom: 0.125rem;
    transition: color 0.3s ease;
    position: relative;
    z-index: 1;
    font-size: 0.85rem;
}

.dropdown-link:hover .dropdown-link-title {
    color: white;
}

.dropdown-link-description {
    font-size: 0.7rem;
    color: rgb(107, 114, 128);
    line-height: 1.25;
    position: relative;
    z-index: 1;
}

/* Enhanced Buttons */
.nav-buttons {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-login {
    color: rgb(209, 213, 219);
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: none;
    border: none;
    cursor: pointer;
    text-decoration: none;
    border-radius: 0.375rem;
}

    .btn-login:hover {
        color: white;
        background: rgba(255, 255, 255, 0.05);
    }

.btn-signup {
    background: linear-gradient(135deg, #ffffff 0%, #f3f4f6 100%);
    color: black;
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 0.375rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    cursor: pointer;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

    .btn-signup::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
        opacity: 0;
        transition: opacity 0.3s ease;
    }

    .btn-signup:hover::before {
        opacity: 1;
    }

    .btn-signup:hover {
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(255, 255, 255, 0.2);
    }

    .btn-signup span {
        position: relative;
        z-index: 1;
    }

/* Enhanced Mobile Navigation */
.mobile-nav {
    display: block;
}

@media (min-width: 768px) {
    .mobile-nav {
        display: none;
    }
}

.hamburger {
    color: white;
    padding: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
    border-radius: 0.375rem;
    transition: all 0.3s ease;
    position: relative;
}

    .hamburger:hover {
        background: rgba(255, 255, 255, 0.05);
    }

.hamburger-lines {
    display: flex;
    flex-direction: column;
    gap: 3px;
    width: 20px;
    height: 15px;
}

.hamburger-line {
    width: 100%;
    height: 2px;
    background: white;
    border-radius: 1px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center;
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: translateY(5px) rotate(45deg);
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: translateY(-5px) rotate(-45deg);
}

/* Enhanced Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    transform: translateY(0);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    visibility: hidden;
    z-index: 999;
    max-height: calc(100vh - 80px);
    overflow-y: auto;
}

    .mobile-menu.active {
        transform: translateY(-100%);
        opacity: 1;
        visibility: visible;
    }

.mobile-menu-content {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.mobile-accordion {
    border: none;
    background: none;
}

    .mobile-accordion summary {
        list-style: none;
        cursor: pointer;
        padding: 1rem;
        color: white;
        font-weight: 600;
        border-radius: 0.75rem;
        transition: all 0.3s ease;
        background: rgba(255, 255, 255, 0.03);
        border: 1px solid rgba(255, 255, 255, 0.08);
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

        .mobile-accordion summary::after {
            content: '+';
            font-size: 1.25rem;
            transition: transform 0.3s ease;
        }

    .mobile-accordion[open] summary::after {
        transform: rotate(45deg);
    }

    .mobile-accordion summary:hover {
        background: rgba(255, 255, 255, 0.08);
    }

.mobile-nav-links {
    padding: 1rem 0 0 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.mobile-nav-link {
    color: rgb(156, 163, 175);
    text-decoration: none;
    padding: 0.75rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    display: block;
}

    .mobile-nav-link:hover {
        color: white;
        background: rgba(255, 255, 255, 0.05);
    }

.mobile-link-title {
    font-weight: 500;
    color: rgb(209, 213, 219);
    transition: color 0.3s ease;
}

.mobile-nav-link:hover .mobile-link-title {
    color: white;
}

.mobile-link-description {
    font-size: 0.75rem;
    color: rgb(107, 114, 128);
    line-height: 1.3;
}

/* Scroll Indicator */
.scroll-indicator {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, #ffffff 0%, #9ca3af 100%);
    z-index: 1001;
    transition: width 0.1s ease;
}

/* Enhanced Focus States */
.nav-link:focus-visible,
.dropdown-link:focus-visible,
.btn-login:focus-visible,
.btn-signup:focus-visible,
.mobile-accordion summary:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.6);
    outline-offset: 2px;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

/* Backdrop for mobile menu */
.mobile-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 998;
}

    .mobile-backdrop.active {
        opacity: 1;
        visibility: visible;
    }

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    .nav-link,
    .dropdown-menu,
    .mobile-menu,
    .hamburger-line,
    .btn-signup,
    .btn-login {
        transition: none;
    }

    .dropdown-link:hover {
        transform: none;
    }

    .btn-signup:hover {
        transform: none;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .dropdown-menu {
        border-color: rgba(255, 255, 255, 0.3);
    }

    .nav-link:focus-visible,
    .dropdown-link:focus-visible {
        outline-color: white;
        outline-width: 3px;
    }
}

/* Dark mode optimizations */
@media (prefers-color-scheme: dark) {
    .header {
        background: rgba(0, 0, 0, 0.95);
    }

    .dropdown-menu {
        background: rgba(5, 5, 5, 0.98);
    }
}