/* Header Component Styles */
.header {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(15px);
    padding: 1.2rem 0;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
    border-bottom: 1px solid rgba(102, 126, 234, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: #667eea;
    letter-spacing: -0.5px;
}

.logo a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

.logo a:hover {
    color: #5a67d8;
    transform: scale(1.05);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
}

/* Dropdown */
.dropdown-toggle {
    cursor: pointer;
}
.dropdown .dropdown-menu {
    list-style: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(12px);
    margin: 0.35rem 0 0;
    padding: 0.5rem 0.4rem 0.7rem;
    border: 1px solid rgba(102,126,234,0.15);
    border-radius: 12px;
    box-shadow: 0 8px 28px -4px rgba(0,0,0,0.16);
    min-width: 240px;
    opacity: 0;
    transform: translateY(-6px);
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.3s ease;
    z-index: 50;
}
.dropdown[aria-expanded="true"] > .dropdown-menu,
.dropdown.open > .dropdown-menu {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
.dropdown-menu li a.nav-link {
    display: block;
    padding: 0.55rem 0.85rem;
    font-size: 0.9rem;
    border-radius: 6px;
    background: transparent;
    box-shadow: none;
    color: #111;
    text-decoration: none;
}
.dropdown-menu li a.nav-link:visited { color: #111; }
.dropdown-menu li a.nav-link:focus { background: rgba(102,126,234,0.15); color: #000; }
.dropdown-menu li a.nav-link:hover {
    transform: none;
    /* Ensure dropdown hover text remains visible (override generic .nav-link:hover) */
    background: rgba(102,126,234,0.12);
    color: #000;
    box-shadow: none;
}
@media (max-width: 900px) {
    .dropdown .dropdown-menu {
        position: static;
        box-shadow: none;
        border: none;
        background: transparent;
        padding: 0.25rem 0 0.5rem;
        margin: 0;
        transform: none !important;
        opacity: 1 !important;
        pointer-events: auto;
        min-width: 0;
    }
    .dropdown-menu li a.nav-link {
        padding-left: 1.5rem;
    }
}

.nav-link {
    text-decoration: none;
    color: #4a5568;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.75rem 1.25rem;
    border-radius: 6px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-block;
    position: relative;
    letter-spacing: 0.25px;
}

.nav-link:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.nav-link:active {
    transform: translateY(0);
}

/* Active link styling */
.nav-link.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.25);
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    left: -999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
    background: #667eea;
    color: #fff;
    padding: 0.75rem 1rem;
    border-radius: 4px;
    z-index: 200;
}
.skip-link:focus {
    left: 1rem;
    top: 1rem;
    width: auto;
    height: auto;
}

/* Mobile nav toggle */
.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 6px;
    transition: background 0.3s ease;
}
.nav-toggle:focus-visible {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}
.nav-toggle:hover {
    background: rgba(102,126,234,0.08);
}
.nav-toggle-bar {
    display: block;
    width: 24px;
    height: 3px;
    background: #4a5568;
    margin: 4px 0;
    border-radius: 2px;
    transition: transform 0.4s ease, opacity 0.3s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Collapsible behavior */
@media (max-width: 900px) {
    .nav-toggle { display: inline-block; }
    .nav-menu[data-collapsible="true"] {
        position: absolute;
        right: 1rem;
        top: 100%;
        background: rgba(255,255,255,0.97);
        backdrop-filter: blur(12px);
        padding: 0.75rem 0.75rem 1rem;
        margin-top: 0.75rem;
        flex-direction: column;
        gap: 0.25rem;
        border: 1px solid rgba(102,126,234,0.15);
        border-radius: 12px;
        box-shadow: 0 8px 28px -4px rgba(0,0,0,0.18);
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        transform: translateY(-8px);
        transition: max-height 0.5s ease, opacity 0.35s ease, transform 0.4s ease;
        width: min(260px, 90vw);
    }
    .nav-menu[data-open="true"] {
        max-height: 600px;
        opacity: 1;
        transform: translateY(0);
    }
    .nav-link { display: block; }
}

/* Refined hover/active focus ring */
.nav-link:focus-visible {
    outline: 2px solid #764ba2;
    outline-offset: 2px;
}

/* Subtle gradient border glow on header */
.header {
    border-bottom: 1px solid rgba(102,126,234,0.15);
    box-shadow: 0 4px 18px -6px rgba(0,0,0,0.08);
}

/* Focus styles for accessibility */
.nav-link:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* Mobile responsive for header */
@media (max-width: 768px) {
    .header {
        padding: 1rem 0;
    }
    
    .nav {
        flex-direction: column;
        gap: 1.2rem;
        padding: 0 1rem;
    }
    
    .logo {
        font-size: 1.6rem;
        text-align: center;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }
    
    .nav-link {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .nav-menu {
        flex-direction: column;
        align-items: center;
        width: 100%;
    }
    
    .nav-link {
        width: auto;
        min-width: 140px;
        text-align: center;
    }
}