/* ============================================================
   Header V4 — Shared chrome (base layout, navbar, drawer,
   search overlay, all-categories dropdown, disclaimer).
   Loaded by any page using the V4 design system.
   ============================================================ */

/* === BASE === */
.v4-body {
    font-family: 'DM Sans', system-ui, -apple-system, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: var(--surface-default);
    color: var(--color-neutral-700);
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}
.v4-main { width: 100%; }
.v4-container {
    max-width: var(--max-container);
    margin: 0 auto;
    padding-left: 20px;
    padding-right: 20px;
}
@media (min-width: 768px) {
    .v4-container { padding-left: 40px; padding-right: 40px; }
}

/* === NAVBAR === */
.v4-nav-wrapper {
    position: sticky;
    top: 0;
    z-index: 40;
    width: 100%;
}
.v4-nav {
    position: relative;
    z-index: 10;
    width: 100%;
    background: var(--color-neutral-0);
    transition: background var(--duration-base), border-color var(--duration-base);
}
.v4-nav--scrolled {
    border-bottom: 1px solid var(--color-neutral-200);
}
.v4-nav__inner {
    max-width: var(--max-container);
    margin: 0 auto;
    display: flex;
    align-items: center;
    height: 64px;
    gap: 24px;
    padding: 0 20px;
}
@media (min-width: 768px) {
    .v4-nav__inner { padding: 0 40px; }
}
.v4-nav__logo { flex-shrink: 0; }
.v4-nav__logo img { height: 28px; width: auto; }
.v4-nav__desktop {
    display: none;
    flex: 1;
    align-items: center;
    justify-content: flex-end;
}
@media (min-width: 1024px) {
    .v4-nav__desktop { display: flex; }
}
.v4-nav__links {
    display: flex;
    align-items: center;
    gap: 24px;
}
.v4-nav__link {
    font-size: var(--text-body-sm);
    font-weight: 500;
    color: var(--color-neutral-500);
    text-decoration: none;
    transition: color var(--duration-base);
    background: none;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 0;
}
.v4-nav__link:hover { color: var(--color-neutral-800); }
.v4-nav__link svg { transition: transform var(--duration-base); }

.v4-nav__mobile {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: auto;
}
@media (min-width: 1024px) {
    .v4-nav__mobile { display: none; }
}
.v4-nav__icon-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-neutral-500);
    transition: color var(--duration-base);
    border-radius: var(--radius-sm);
}
.v4-nav__icon-btn:hover { color: var(--color-neutral-800); }

/* Mobile drawer */
.v4-mobile-drawer {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: var(--color-neutral-0);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.v4-mobile-drawer--hidden { display: none; }
.v4-mobile-drawer__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    padding: 0 20px;
    border-bottom: 1px solid var(--color-neutral-100);
    flex-shrink: 0;
}
.v4-mobile-drawer__body {
    flex: 1;
    overflow-y: auto;
}
.v4-mobile-drawer__item {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 14px 20px;
    border: none;
    border-bottom: 1px solid var(--color-neutral-100);
    background: none;
    font-size: var(--text-body-sm);
    font-weight: 500;
    color: var(--color-neutral-700);
    cursor: pointer;
    text-decoration: none;
    text-align: left;
    transition: background var(--duration-fast);
}
.v4-mobile-drawer__item:hover { background: var(--color-neutral-50); }
.v4-mobile-drawer__item span { flex: 1; }

/* Search overlay */
.v4-search-overlay {
    position: fixed;
    inset: 0;
    z-index: 38;
    background: rgba(19, 30, 41, 0.5);
}
.v4-search-bar {
    position: fixed;
    left: 0;
    right: 0;
    z-index: 39;
    background: var(--color-neutral-0);
    border-bottom: 1px solid var(--color-neutral-200);
    padding: 12px 20px;
}
@media (min-width: 768px) {
    .v4-search-bar {
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 12px 40px;
    }
}
.v4-search-bar form {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    max-width: 672px;
}
.v4-search-bar__input-wrap { position: relative; flex: 1; }
.v4-search-bar__icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-neutral-400);
    pointer-events: none;
}
.v4-search-bar input {
    width: 100%;
    padding: 12px 16px 12px 44px;
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--radius-full);
    font-size: var(--text-body);
    color: var(--color-neutral-700);
    background: var(--color-neutral-0);
    outline: none;
    transition: border-color var(--duration-base), box-shadow var(--duration-base);
    font-family: inherit;
}
.v4-search-bar input::placeholder { color: var(--color-neutral-400); }
.v4-search-bar input:focus {
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px rgba(131, 66, 234, 0.2);
}

/* === ALL CATEGORIES DROPDOWN === */
.v4-allcats {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 640px;
    background: var(--color-neutral-0);
    border: 1px solid var(--color-neutral-100);
    border-radius: var(--radius-md);
    box-shadow: 0 24px 48px rgba(0,0,0,.08), 0 12px 16px rgba(0,0,0,.05);
    padding: 16px;
    z-index: 50;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
}
.v4-allcats--hidden { display: none; }
.v4-allcats__inner { max-width: 100%; }
.v4-allcats__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
}
.v4-allcats__item {
    display: block;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: var(--text-body-sm);
    font-weight: 500;
    color: var(--color-neutral-600);
    text-decoration: none;
    transition: background var(--duration-fast), color var(--duration-fast);
}
.v4-allcats__item:hover {
    background: var(--color-primary-50);
    color: var(--color-primary-700);
}
.v4-nav__caret {
    transition: transform var(--duration-base);
}
.v4-nav__caret--open {
    transform: rotate(180deg);
}

/* === DISCLAIMER === */
.v4-disclaimer {
    width: 100%;
    background: var(--color-neutral-100);
    padding: 12px 20px;
    text-align: center;
    min-height: 36px;
    transition: opacity 200ms ease;
    border-bottom: 1px solid var(--color-neutral-200);
}
.v4-disclaimer--hidden {
    opacity: 0;
    pointer-events: none;
}
@media (min-width: 768px) {
    .v4-disclaimer { padding: 12px 40px; }
}
.v4-disclaimer p {
    max-width: var(--max-container);
    margin: 0 auto;
    font-size: var(--text-caption);
    color: var(--color-neutral-500);
    line-height: 1;
}
.v4-disclaimer a {
    color: var(--color-primary-500);
    text-underline-offset: 2px;
    font-weight: 500;
}
.v4-disclaimer a:hover { color: var(--color-primary-700); }