/*
========================================
Header And Navigation Styles
Owns: navbar, logo, dropdowns, mobile menu.
Keep header-specific changes here instead of styles.css.
========================================
*/

.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-xs);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-light);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-icon {
    font-size: 28px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 36px;
    list-style: none;
}

.nav-links[hidden] {
    display: none !important;
}

.nav-links > li {
    position: relative;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-color);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
}

.nav-dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.nav-dropdown-toggle::before {
    content: '';
    width: 7px;
    height: 7px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    margin-top: -4px;
    order: 2;
    transition: transform var(--transition-fast);
}

.nav-dropdown.is-open > .nav-dropdown-toggle::before {
    transform: rotate(225deg);
    margin-top: 2px;
}

.nav-submenu {
    position: absolute;
    top: calc(100% + 14px);
    left: 0;
    min-width: 220px;
    list-style: none;
    margin: 0;
    padding: 8px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: #fff;
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    transform: translateY(6px);
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
    z-index: 1100;
}

.nav-submenu li {
    margin: 0;
}

.nav-submenu a {
    display: block;
    padding: 9px 10px;
    border-radius: 8px;
    font-size: 14px;
}

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

.nav-submenu a:hover,
.nav-submenu a.active {
    background: #eff6ff;
    color: var(--primary-color);
}

.nav-dropdown:hover .nav-submenu,
.nav-dropdown:focus-within .nav-submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-buttons {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
}

.mobile-menu-btn:hover {
    background-color: var(--background-color);
}

.mobile-menu-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

body.no-scroll {
    overflow: hidden;
}

@media (max-width: 768px) {
    .navbar .container {
        height: 64px;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background-color: var(--surface-color);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--border-color);
        max-height: calc(100vh - 64px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links > li {
        width: 100%;
    }

    .nav-dropdown .nav-submenu {
        position: static;
        opacity: 0;
        visibility: hidden;
        transform: none;
        margin-top: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
        padding: 0 0 0 12px;
        min-width: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-fast), opacity var(--transition-fast), margin-top var(--transition-fast), visibility var(--transition-fast);
    }

    .nav-dropdown.is-open .nav-submenu {
        opacity: 1;
        visibility: visible;
        margin-top: 8px;
        max-height: 600px;
    }

    .nav-dropdown .nav-submenu a {
        padding: 8px 0;
        border-radius: 0;
    }

    .nav-dropdown .nav-submenu a:hover,
    .nav-dropdown .nav-submenu a.active {
        background: transparent;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .nav-buttons {
        display: none;
    }
}

/* Mega-menu base styles */
.nav-mega .mega-menu {
    display: flex;
    gap: 24px;
    padding: 18px;
    background: #fff;
    border-radius: 12px;
    box-shadow: var(--shadow-xl);
    position: absolute;
    top: calc(100% + 14px);
    left: 0;
    z-index: 1200;
    width: max(760px, 60vw);
}
.nav-mega .mega-column {
    min-width: 160px;
}
.nav-mega .mega-column h4.mega-heading { margin: 0 0 6px; font-size: 15px; }
.nav-mega .mega-column .mega-sub { margin: 0 0 8px; font-size: 13px; color: var(--text-muted); }
.nav-mega .mega-column ul { list-style: none; margin: 0; padding: 0; }
.nav-mega .mega-column ul li a { display: block; padding: 6px 0; color: var(--text-secondary); }

/* Mobile overrides: stack columns and allow scrolling */
@media (max-width: 768px) {
    .nav-mega .mega-menu {
        position: static;
        width: auto;
        box-shadow: none;
        background: transparent;
        padding: 8px 12px 18px 12px;
        display: block;
        margin-left: 0;
    }

    .nav-mega .mega-column {
        display: block;
        width: 100%;
        padding: 8px 0;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-mega .mega-column:last-child { border-bottom: 0; }

    /* Ensure mega menu area itself can scroll if very tall */
    .nav-mega .mega-menu {
        max-height: calc(100vh - 120px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }
}