/* ===================================
   Header — Sticky Nav + Mobile Menu
   =================================== */

/* Beta top banner */
.beta-top-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: calc(var(--z-header) + 1);
    background: var(--color-teal);
    color: var(--white);
    text-align: center;
    padding: 8px 16px;
    font-size: var(--text-sm);
    font-weight: 600;
    line-height: 1.4;
}

@media (max-width: 768px) {
    .beta-top-banner { font-size: var(--text-xs); padding: 6px 12px; }
}

/* Logo BETA badge */
.logo-beta-badge {
    background: var(--color-teal);
    color: var(--white);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 2px 8px;
    border-radius: 4px;
}

.header {
    position: fixed;
    top: 36px;
    left: 0;
    right: 0;
    z-index: var(--z-header);
    background: rgba(245, 243, 237, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: box-shadow var(--duration-fast) ease,
                background-color var(--duration-fast) ease;
}

.header.is-scrolled {
    box-shadow: 0 1px 8px rgba(44, 46, 42, 0.06);
    background: rgba(245, 243, 237, 0.95);
}

/* Nav layout */
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.logo-icon {
    height: 48px;
    width: auto;
    object-fit: contain;
}

/* Nav links */
.nav-links {
    display: flex;
    gap: var(--space-8);
}

.nav-links a {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: color var(--duration-fast) ease;
}

.nav-links a:hover {
    color: var(--color-text);
}

/* Header CTA */
.header .btn-primary {
    flex-shrink: 0;
}

/* Mobile menu button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background-color: var(--color-charcoal);
    border-radius: 2px;
    transition: all 0.3s var(--ease-out);
}

.mobile-menu-btn.is-active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-btn.is-active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Nav dropdown */
.nav-dropdown-trigger {
    position: relative;
}

.nav-dropdown-label {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: color var(--duration-fast) ease;
}

.nav-dropdown-label svg {
    transition: transform var(--duration-fast) ease;
}

.nav-dropdown-trigger:hover .nav-dropdown-label,
.nav-dropdown-trigger.is-open .nav-dropdown-label {
    color: var(--color-text);
}

.nav-dropdown-trigger:hover .nav-dropdown-label svg,
.nav-dropdown-trigger.is-open .nav-dropdown-label svg {
    transform: rotate(180deg);
}

.nav-dropdown {
    position: absolute;
    top: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 300px;
    background: var(--color-cream);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--space-3);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-fast) ease,
                visibility var(--duration-fast) ease,
                transform var(--duration-fast) ease;
    transform: translateX(-50%) translateY(4px);
    z-index: 100;
}

.nav-dropdown::before {
    content: '';
    position: absolute;
    top: -12px;
    left: 0;
    right: 0;
    height: 12px;
}

.nav-dropdown-trigger:hover .nav-dropdown,
.nav-dropdown-trigger.is-open .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.nav-dropdown__item {
    display: block;
    padding: var(--space-3) var(--space-4);
    border-radius: 8px;
    transition: background var(--duration-fast) ease;
}

.nav-dropdown__item:hover {
    background: rgba(8, 145, 178, 0.06);
}

.nav-dropdown__item + .nav-dropdown__item {
    margin-top: 2px;
}

.nav-dropdown__title {
    display: block;
    color: var(--color-text);
    font-size: var(--text-sm);
    font-weight: 600;
    line-height: 1.3;
}

.nav-dropdown__desc {
    display: block;
    color: var(--color-text-muted);
    font-size: 12px;
    font-weight: 400;
    line-height: 1.4;
    margin-top: 2px;
}

.nav-dropdown__item:hover .nav-dropdown__title {
    color: var(--color-teal);
}

/* Mobile menu */
@media (max-width: 768px) {
    .nav-links,
    .header .btn-primary {
        display: none;
    }

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

    .nav.is-open .nav-links {
        display: flex;
        position: absolute;
        top: 72px; /* relative to .nav, not affected by banner offset */
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-cream);
        padding: var(--space-6);
        gap: var(--space-4);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
    }

    .nav.is-open .nav-links a,
    .nav.is-open .nav-dropdown-label {
        font-size: var(--text-base);
        padding: var(--space-2) 0;
    }

    .nav-dropdown-trigger {
        position: static;
    }

    .nav-dropdown {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        min-width: 0;
        background: none;
        border: none;
        border-radius: 0;
        padding: 0;
        box-shadow: none;
        display: none;
    }

    .nav-dropdown-trigger.is-open .nav-dropdown {
        display: block;
        padding-left: var(--space-4);
    }

    .nav-dropdown::before {
        display: none;
    }

    .nav-dropdown__item {
        padding: var(--space-1) 0;
        border-radius: 0;
    }

    .nav-dropdown__item + .nav-dropdown__item {
        margin-top: 0;
    }

    .nav-dropdown__desc {
        display: none;
    }

    .nav-dropdown__title {
        font-weight: 500;
    }

    .nav.is-open .btn-primary {
        display: inline-flex;
        margin-top: var(--space-2);
    }
}