/* ===== 头部导航样式 ===== */
.header {
    position: sticky;
    top: 0;
    background: var(--white);
    box-shadow: var(--shadow-sm);
    z-index: var(--z-sticky);
    height: var(--header-height);
}
.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}
.header__logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.header__logo-icon {
    width: 36px;
    height: 36px;
}
.header__logo-text {
    font-size: 1.25rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--coral-blue), var(--coral-orange));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
}
.header__nav {
    display: flex;
    align-items: center;
    gap: 4px;
}
.header__nav-link {
    padding: 8px 14px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--dark-gray);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    white-space: nowrap;
}
.header__nav-link:hover,
.header__nav-link--active {
    color: var(--coral-blue);
    background: var(--coral-blue-light);
}
.header__right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}
.header__search {
    position: relative;
}
.header__search-input {
    width: 220px;
    padding: 8px 36px 8px 14px;
    border: 2px solid var(--light-gray);
    border-radius: 20px;
    font-size: 0.875rem;
    outline: none;
    transition: all var(--transition-normal);
    background: var(--ivory);
}
.header__search-input:focus {
    border-color: var(--coral-blue);
    background: var(--white);
    width: 280px;
}
.header__search-icon {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: #90A4AE;
    font-size: 0.875rem;
    pointer-events: none;
}
.header__search-results {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    max-height: 360px;
    overflow-y: auto;
    display: none;
    z-index: var(--z-dropdown);
}
.header__search-results--visible {
    display: block;
}
.header__search-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    transition: background var(--transition-fast);
    cursor: pointer;
}
.header__search-item:hover {
    background: var(--coral-blue-light);
}
.header__search-item img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    object-fit: cover;
}
.header__search-item-info {
    flex: 1;
    min-width: 0;
}
.header__search-item-title {
    font-size: 0.875rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.header__search-item-cat {
    font-size: 0.75rem;
    color: #90A4AE;
}
.header__search-empty {
    padding: 20px;
    text-align: center;
    color: #90A4AE;
    font-size: 0.875rem;
}

.header__hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    cursor: pointer;
}
.header__hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--dark-gray);
    border-radius: 1px;
    transition: all var(--transition-normal);
}
.header__hamburger--active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.header__hamburger--active span:nth-child(2) {
    opacity: 0;
}
.header__hamburger--active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    z-index: var(--z-fixed);
    padding: 20px;
    overflow-y: auto;
}
.mobile-nav--visible {
    display: block;
}
.mobile-nav__link {
    display: block;
    padding: 14px 16px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark-gray);
    border-bottom: 1px solid var(--light-gray);
    transition: color var(--transition-fast);
}
.mobile-nav__link:hover,
.mobile-nav__link--active {
    color: var(--coral-blue);
}
.mobile-nav__search {
    margin-bottom: 16px;
}
.mobile-nav__search-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--light-gray);
    border-radius: var(--radius-md);
    font-size: 1rem;
    outline: none;
}
.mobile-nav__search-input:focus {
    border-color: var(--coral-blue);
}

@media (max-width: 1024px) {
    .header__nav {
        display: none;
    }
    .header__search {
        display: none;
    }
    .header__hamburger {
        display: flex;
    }
}
@media (max-width: 767px) {
    .header__logo-text {
        font-size: 1rem;
    }
    .header__logo-icon {
        width: 28px;
        height: 28px;
    }
}