/*
 * Westtree · Mega Menu + Header Search
 */

/* ============================================================
 * Mega Menu container
 * ============================================================ */
.ar-has-mega { position: relative; }

/* 统一所有导航项为 inline-flex，保证带下拉的按钮与其他项垂直对齐 */
.ar-nav .ar-nav__link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.ar-nav__link--parent {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.ar-nav__link--parent svg {
    transition: transform var(--dur-fast) var(--ease-out);
    flex-shrink: 0;
}
.ar-has-mega.is-open > .ar-nav__link--parent svg {
    transform: rotate(180deg);
}
.ar-has-mega.is-open > .ar-nav__link {
    color: var(--color-primary);
}

.ar-mega {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: min(720px, 92vw);
    margin-top: 12px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-modal);
    overflow: hidden;
}
.ar-has-mega.is-open .ar-mega { display: block; }

.ar-mega__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    padding: var(--space-6);
}
/* Docs 下拉更宽，避免类型名称换行导致不均衡 */
.ar-mega--docs {
    width: min(880px, 94vw);
}
.ar-mega--docs .ar-mega__grid {
    grid-template-columns: 1.6fr 1fr;
}
.ar-mega--docs .ar-mega__list a {
    align-items: flex-start;
    flex-direction: column;
    gap: 2px;
}
.ar-mega--docs .ar-mega__model-name { white-space: nowrap; }

.ar-mega__col { min-width: 0; }
.ar-mega__title {
    font-size: var(--text-caption);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    color: var(--color-text-tertiary);
    margin: 0 0 var(--space-3);
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--color-border);
}
.ar-mega__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.ar-mega__list li { margin: 0; }
.ar-mega__list a {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--text-body-s);
    transition: all var(--dur-fast) var(--ease-out);
}
.ar-mega__list a:hover {
    color: var(--color-primary);
    background: var(--color-bg);
}
.ar-mega__model-name { color: inherit; font-weight: var(--weight-medium); }
.ar-mega__model-price {
    font-family: var(--font-mono);
    font-size: var(--text-caption);
    color: var(--color-primary);
    white-space: nowrap;
}

.ar-mega__foot {
    display: flex;
    justify-content: flex-end;
    padding: var(--space-3) var(--space-6);
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-alt);
}
.ar-mega__cta {
    color: var(--color-primary);
    text-decoration: none;
    font-size: var(--text-body-s);
    font-weight: var(--weight-semibold);
}
.ar-mega__cta:hover { text-decoration: underline; }

/* ============================================================
 * Header search
 * ============================================================ */
.ar-header__search { position: relative; }
.ar-header__search-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--dur-fast) var(--ease-out);
}
.ar-header__search-toggle:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}
.ar-header__search-box {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: min(360px, 88vw);
    z-index: var(--z-modal);
}
.ar-header__search-box input {
    width: 100%;
    height: 44px;
    padding: 0 var(--space-4);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: var(--text-body-s);
    box-shadow: var(--shadow-lg);
}
.ar-header__search-box input:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* ============================================================
 * Mobile (drawer)
 * ============================================================ */
@media (max-width: 900px) {
    .ar-has-mega { position: static; }
    .ar-mega {
        position: static;
        transform: none;
        width: 100%;
        margin: var(--space-2) 0 0;
        box-shadow: none;
        border-radius: var(--radius-md);
        border-color: var(--color-border);
    }
    .ar-mega__grid,
    .ar-mega--docs .ar-mega__grid {
        grid-template-columns: 1fr;
        gap: var(--space-5);
        padding: var(--space-4);
    }
    .ar-mega__foot { padding: var(--space-3) var(--space-4); }
}