/* ── Accent line - top-of-page brand signal ── */
.ba-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-dark) 50%, var(--color-primary) 100%);
    z-index: 1;
}

/* ── Header ── */
.ba-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    height: var(--header-height);
    box-shadow: 0 1px 4px rgba(0,0,0,0.06), 0 6px 20px rgba(0,0,0,0.04);
}

.ba-header__inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    gap: var(--space-8);
}

/* Logo */
.ba-logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none !important;
}
.ba-logo:hover { text-decoration: none !important; }

.ba-logo__icon {
    height: 44px;
    width: auto;
}

.ba-logo__wordmark {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.ba-logo__top {
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    color: var(--color-text);
}

.ba-logo__bottom {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--color-text-muted);
}

/* Navigation */
.ba-nav { flex: 1; display: flex; justify-content: flex-start; }

.ba-menu {
    list-style: none;
    display: flex;
    gap: 4px;
    margin: 0;
    padding: 0;
}

/* ── Top-level nav links - uppercase, authoritative ── */
.ba-menu > .ba-menu-item > a {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 8px 16px;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-text);
    border-radius: var(--radius-md);
    white-space: nowrap;
    text-decoration: none;
    position: relative;
    transition: color 0.2s, background 0.2s;
}

.ba-menu > .ba-menu-item > a:hover {
    color: var(--color-primary-dark);
    background: var(--color-bg-alt);
    text-decoration: none !important;
}

.ba-submenu .ba-menu-item > a:hover {
    text-decoration: none !important;
}

/* Active page - teal underline indicator */
.ba-menu > .ba-menu-item--active > a {
    color: var(--color-primary-dark);
}
.ba-menu > .ba-menu-item--active > a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 16px;
    right: 16px;
    height: 2.5px;
    background: var(--color-primary);
    border-radius: 2px;
}

/* ── Dropdown arrows ── */

/* Top-level chevron down */
svg.ba-menu-arrow {
    display: inline-block !important;
    width: 10px !important;
    height: 10px !important;
    min-width: 10px;
    min-height: 10px;
    flex-shrink: 0;
    vertical-align: middle;
    transition: transform 0.25s ease, opacity 0.2s;
    opacity: 0.4;
}
.ba-menu-item > a:hover svg.ba-menu-arrow {
    opacity: 0.8;
}

/* Submenu chevron right */
svg.ba-menu-arrow--sub {
    margin-left: auto;
    opacity: 0.3;
}
.ba-submenu .ba-menu-item > a:hover svg.ba-menu-arrow--sub {
    opacity: 0.7;
}

/* ── Dropdown ── */
.ba-menu-item--has-children {
    position: relative;
}

.ba-submenu {
    position: absolute;
    top: calc(100% + 6px);
    left: -8px;
    min-width: 240px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 30px rgba(0,0,0,0.1), 0 2px 8px rgba(0,0,0,0.04);
    padding: 6px;
    list-style: none;
    z-index: 100;

    /* Smooth open animation */
    visibility: hidden;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
}

.ba-menu-item--has-children:hover > .ba-submenu,
.ba-menu-item--has-children:focus-within > .ba-submenu {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
}

.ba-menu-item--has-children:hover > a svg.ba-menu-arrow {
    transform: rotate(180deg);
    opacity: 0.8;
}

/* Dropdown items */
.ba-submenu .ba-menu-item > a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 9px 14px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text);
    border-radius: var(--radius-md);
    text-transform: none;
    letter-spacing: 0;
    transition: color 0.15s, background 0.15s;
}
.ba-submenu .ba-menu-item > a:hover {
    background: var(--color-trust-bg);
    color: var(--color-primary-dark);
}

/* Nested submenus */
.ba-submenu .ba-menu-item--has-children > .ba-submenu {
    top: -6px;
    left: calc(100% + 4px);
}

/* ── Hamburger ── */
.ba-hamburger {
    display: none;
    background: none;
    border: 1px solid var(--color-border);
    cursor: pointer;
    padding: 7px;
    color: var(--color-text);
    border-radius: var(--radius-md);
    transition: background 0.15s, border-color 0.15s;
}
.ba-hamburger:hover {
    background: var(--color-bg-alt);
    border-color: var(--color-text-light);
}

/* ── Hamburger animation (lines → X) ── */
.ba-hamburger__line {
    transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.2s ease;
    transform-origin: center;
}
.ba-hamburger[aria-expanded="true"] .ba-hamburger__line--top {
    transform: translateY(6px) rotate(45deg);
}
.ba-hamburger[aria-expanded="true"] .ba-hamburger__line--mid {
    opacity: 0;
    transform: scaleX(0);
}
.ba-hamburger[aria-expanded="true"] .ba-hamburger__line--bot {
    transform: translateY(-6px) rotate(-45deg);
}

/* ── Desktop: hide mobile-only elements ── */
.ba-nav-header { display: none; }
.ba-nav-overlay { display: none; }
.ba-nav-close { display: none; }

/* ── Mobile ── */
@media (max-width: 900px) {
    .ba-header::before { height: 2px; }

    .ba-header {
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        background: #fff;
    }

    .ba-logo__icon { height: 36px; }
    .ba-logo__top { font-size: 0.85rem; }
    .ba-logo__bottom { font-size: 0.62rem; }

    .ba-hamburger {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 42px;
        height: 42px;
        padding: 0;
        border: none;
        border-radius: var(--radius-md);
        z-index: 1001;
    }

    /* ── Overlay backdrop ── */
    .ba-nav-overlay {
        position: fixed;
        inset: 0;
        background: rgba(15,23,42,0.4);
        z-index: 998;
        display: none;
    }
    .ba-nav-overlay.ba-nav-overlay--visible {
        display: block;
    }

    /* ── Slide-in panel from LEFT ── */
    .ba-nav {
        position: fixed;
        top: 0;
        left: 0;
        right: auto;
        bottom: 0;
        width: 300px;
        max-width: 82vw;
        background: #fff;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        padding: 0;
        z-index: 999;
        border-right: 1px solid var(--color-border);
        box-shadow: 8px 0 40px rgba(0,0,0,0.1);

        transform: translateX(-100%);
        will-change: transform;
        transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
        display: block;
    }

    .ba-nav.ba-nav--open {
        transform: translateX(0);
    }

    /* ── Panel header with logo + close ── */
    .ba-nav-header {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 20px 20px 16px;
        border-bottom: 1px solid var(--color-border);
        background: linear-gradient(180deg, var(--color-trust-bg) 0%, #fff 100%);
    }
    .ba-nav-header__logo {
        height: 32px;
        width: auto;
    }
    .ba-nav-header__brand {
        flex: 1;
        display: flex;
        flex-direction: column;
        gap: 1px;
    }
    .ba-nav-header__title {
        font-size: 0.82rem;
        font-weight: 800;
        letter-spacing: -0.01em;
        color: var(--color-text);
        line-height: 1.1;
    }
    .ba-nav-header__sub {
        font-size: 0.65rem;
        font-weight: 500;
        color: var(--color-text-muted);
        letter-spacing: 0.01em;
    }
    .ba-nav-close {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 32px;
        height: 32px;
        background: none;
        border: none;
        border-radius: var(--radius-full);
        cursor: pointer;
        color: var(--color-text-muted);
        transition: background 0.15s, color 0.15s;
        flex-shrink: 0;
    }
    .ba-nav-close:hover {
        background: var(--color-bg-alt);
        color: var(--color-text);
    }
    .ba-nav-close svg {
        display: block;
    }

    /* ── Menu items ── */
    .ba-menu {
        flex-direction: column;
        gap: 0;
        padding: 12px 0 32px;
    }

    /* Section label for top-level */
    .ba-menu > .ba-menu-item > a {
        display: flex;
        align-items: center;
        gap: 6px;
        padding: 13px 20px;
        font-size: 0.88rem;
        font-weight: 600;
        text-transform: none;
        letter-spacing: -0.005em;
        border-radius: 0;
        color: var(--color-text);
        position: relative;
        transition: background 0.15s, color 0.15s;
    }
    .ba-menu > .ba-menu-item > a:hover {
        background: var(--color-bg-alt);
        color: var(--color-primary-dark);
    }

    /* Arrow pushed to right */
    .ba-menu > .ba-menu-item > a svg.ba-menu-arrow {
        margin-left: auto;
        width: 12px !important;
        height: 12px !important;
        opacity: 0.3;
    }

    /* Active item */
    .ba-menu > .ba-menu-item--active > a {
        color: var(--color-primary-dark);
        background: var(--color-trust-bg);
    }
    .ba-menu > .ba-menu-item--active > a::before {
        content: '';
        position: absolute;
        left: 0;
        top: 4px;
        bottom: 4px;
        width: 3px;
        background: var(--color-primary);
        border-radius: 0 3px 3px 0;
    }
    .ba-menu > .ba-menu-item--active > a::after { display: none; }

    /* Divider between top-level groups */
    .ba-menu > .ba-menu-item + .ba-menu-item::before {
        content: '';
        display: block;
        height: 1px;
        background: var(--color-border);
        margin: 4px 20px;
    }

    /* ── Expanded parent styling ── */
    .ba-menu > .ba-menu-item--has-children.ba-menu-item--expanded > a {
        color: var(--color-primary-dark);
        font-weight: 700;
    }

    /* ── Submenu accordion ── */
    .ba-submenu {
        position: static;
        box-shadow: none;
        border: none;
        border-radius: 0;
        padding: 0;
        min-width: 0;
        background: transparent;
        transform: none;
        visibility: visible;
        opacity: 1;

        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-out;
    }

    .ba-menu-item--has-children.ba-menu-item--expanded > .ba-submenu {
        max-height: 2000px;
        transition: max-height 0.35s ease-in;
    }

    /* Arrow rotation */
    .ba-menu-item--has-children > a svg.ba-menu-arrow {
        transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.2s;
    }
    .ba-menu-item--has-children.ba-menu-item--expanded > a svg.ba-menu-arrow {
        transform: rotate(180deg);
        opacity: 0.6;
    }

    /* Submenu items */
    .ba-submenu .ba-menu-item > a {
        padding: 10px 20px 10px 38px;
        font-size: 0.84rem;
        font-weight: 400;
        color: var(--color-text-muted);
        border-bottom: none;
        border-radius: 0;
        position: relative;
        transition: background 0.15s, color 0.15s;
    }
    .ba-submenu .ba-menu-item > a::before {
        content: '';
        position: absolute;
        left: 22px;
        top: 50%;
        width: 4px;
        height: 4px;
        border-radius: 50%;
        background: var(--color-border);
        transform: translateY(-50%);
        transition: background 0.15s;
    }
    .ba-submenu .ba-menu-item > a:hover {
        color: var(--color-primary-dark);
        background: var(--color-trust-bg);
    }
    .ba-submenu .ba-menu-item > a:hover::before {
        background: var(--color-primary);
    }

    /* Nested submenu (level 2+) */
    .ba-submenu .ba-submenu {
        background: var(--color-bg-alt);
        border-radius: var(--radius-md);
        margin: 2px 12px 6px 30px;
    }
    .ba-submenu .ba-submenu .ba-menu-item > a {
        padding: 9px 14px 9px 22px;
        font-size: 0.8rem;
        color: var(--color-text-muted);
    }
    .ba-submenu .ba-submenu .ba-menu-item > a::before {
        left: 10px;
        width: 3px;
        height: 3px;
    }

    /* Bottom padding for safe area (iPhone notch) */
    .ba-nav::after {
        content: '';
        display: block;
        height: env(safe-area-inset-bottom, 20px);
    }
}