/* ==========================================================
   Purified LLC — Header & Navigation
   File: header.css
   Purpose: Top bar, sticky header, desktop nav, mobile menu
   ========================================================== */

/* ------------------------------
   Top Information Bar
------------------------------ */

.top-bar {
    position: relative;
    z-index: calc(var(--z-header) + 1);
    background: var(--color-primary-800);
    color: var(--color-white);
    font-size: var(--font-size-sm);
}

.top-bar-inner {
    min-height: 42px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

.top-bar a,
.top-bar span {
    color: rgba(255, 255, 255, 0.92);
    font-weight: 600;
}

.top-bar a {
    margin-right: var(--space-6);
}

.top-bar a:hover {
    color: var(--color-white);
}

.top-bar .top-right,
.top-bar-inner > div:last-child {
    display: flex;
    align-items: center;
    gap: var(--space-5);
}

/* ------------------------------
   Main Header
------------------------------ */

.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid rgba(220, 228, 239, 0.75);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    transition:
        background var(--transition-base),
        box-shadow var(--transition-base),
        border-color var(--transition-base);
}

.site-header.is-scrolled {
    background: rgba(255, 255, 255, 0.98);
    border-color: rgba(220, 228, 239, 1);
    box-shadow: var(--shadow-sm);
}

.header-container {
    min-height: 82px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-6);
}

/* ------------------------------
   Brand
------------------------------ */

.brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--color-primary-800);
    text-decoration: none;
    min-width: max-content;
}

.brand-mark {
    width: 52px;
    height: 52px;
    display: grid;
    place-items: center;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    color: var(--color-white);
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 800;
    line-height: 1;
    box-shadow: 0 12px 25px rgba(10, 77, 140, 0.22);
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.brand-text strong {
    font-family: var(--font-heading);
    font-size: 1.9rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    color: var(--color-primary-800);
}

.brand-text small {
    margin-top: 4px;
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-muted);
}

/* ------------------------------
   Desktop Navigation
------------------------------ */

.navigation ul {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    list-style: none;
}

.navigation a {
    position: relative;
    display: inline-flex;
    align-items: center;
    min-height: 42px;
    color: var(--color-text);
    font-size: var(--font-size-sm);
    font-weight: 700;
    text-decoration: none;
}

.navigation a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 5px;
    width: 100%;
    height: 2px;
    background: var(--color-success-500);
    border-radius: var(--radius-pill);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-base);
}

.navigation a:hover {
    color: var(--color-primary-700);
}

.navigation a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* ------------------------------
   Header CTA
------------------------------ */

.header-cta {
    white-space: nowrap;
    padding-inline: var(--space-6);
}

/* ------------------------------
   Mobile Menu Button
------------------------------ */

.mobile-menu-button {
    width: 46px;
    height: 46px;
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    border-radius: var(--radius-sm);
    background: var(--color-background-soft);
    border: 1px solid var(--color-border);
}

.mobile-menu-button span {
    width: 24px;
    height: 2.5px;
    display: block;
    border-radius: var(--radius-pill);
    background: var(--color-primary-800);
    transition: transform var(--transition-base),
                opacity var(--transition-base);
}

.mobile-menu-button[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}

.mobile-menu-button[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-button[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* ------------------------------
   Responsive Header
------------------------------ */

@media (max-width: 1080px) {
    .navigation ul {
        gap: var(--space-4);
    }

    .brand-text small {
        display: none;
    }
}

@media (max-width: 980px) {
    .top-bar-inner {
        justify-content: center;
        text-align: center;
        flex-wrap: wrap;
        padding-block: var(--space-2);
    }

    .top-bar a {
        margin-right: var(--space-3);
    }

    .header-container {
        min-height: 74px;
    }

    .navigation {
        position: absolute;
        top: 100%;
        left: var(--container-padding);
        right: var(--container-padding);
        display: none;
        padding: var(--space-4);
        background: var(--color-white);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-md);
    }

    .navigation.is-open {
        display: block;
        animation: mobileMenuIn var(--transition-base) both;
    }

    .navigation ul {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }

    .navigation a {
        min-height: 48px;
        padding-inline: var(--space-4);
        border-radius: var(--radius-sm);
    }

    .navigation a:hover {
        background: var(--color-background-soft);
    }

    .navigation a::after {
        display: none;
    }

    .header-cta {
        display: none;
    }

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

@media (max-width: 640px) {
    .top-bar {
        font-size: 0.78rem;
    }

    .top-bar-inner {
        gap: var(--space-2);
    }

    .top-bar-inner > div {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--space-2);
    }

    .top-bar a,
    .top-bar span {
        margin: 0;
    }

    .brand-mark {
        width: 44px;
        height: 44px;
        font-size: 1.5rem;
        border-radius: 11px;
    }

    .brand-text strong {
        font-size: 1.42rem;
    }

    .header-container {
        min-height: 68px;
    }
}

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

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