/**
 * component-header.css - 顶部导航栏
 * 导航、搜索弹窗、用户下拉菜单
 */

/* ==============================
   顶部导航（透明玻璃效果）
   ============================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(15, 23, 42, 0.35);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    z-index: 100;
    transition: all 0.3s ease;
}

/* 滚动时增加背景不透明度 */
.site-header.scrolled {
    background: rgba(15, 23, 42, 0.6);
    border-bottom-color: rgba(255, 255, 255, 0.12);
}

.dark .site-header {
    background: rgba(0, 0, 0, 0.35);
    border-bottom-color: rgba(255, 255, 255, 0.06);
}

.dark .site-header.scrolled {
    background: rgba(0, 0, 0, 0.6);
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

.header-inner {
    display: flex;
    align-items: center;
    height: 100%;
    gap: 32px;
}

.logo a {
    font-size: 1.25rem;
    font-weight: 700;
    color: #ffffff;
}

.main-nav {
    display: flex;
    gap: 24px;
    flex: 1;
    align-items: center;
}

.main-nav > a,
.main-nav .dropdown-toggle {
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 500;
    position: relative;
    padding: 4px 0;
    display: flex;
    align-items: center;
    gap: 4px;
}

.main-nav > a::after,
.main-nav .dropdown-toggle::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    border-radius: var(--radius-full);
    transition: width 0.2s ease;
}

.main-nav > a:hover,
.main-nav .dropdown-toggle:hover {
    color: rgba(255, 255, 255, 0.8);
}

.main-nav > a:hover::after,
.main-nav .dropdown-toggle:hover::after {
    width: 100%;
}

/* 分类下拉菜单 */
.nav-dropdown {
    position: relative;
}

.dropdown-toggle svg {
    color: #ffffff;
    transition: transform 0.2s ease;
}

.nav-dropdown:hover .dropdown-toggle svg {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: -8px;
    min-width: 160px;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.25s ease;
    z-index: 200;
}

.dropdown-menu::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 16px;
    width: 12px;
    height: 12px;
    background: rgba(15, 23, 42, 0.7);
    border-left: 1px solid rgba(255, 255, 255, 0.12);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    transform: rotate(45deg);
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* 独立页面链接 — 与 nav 一致样式 */
.main-nav > a {
    color: #ffffff;
}

.dropdown-menu a {
    display: block;
    padding: 8px 12px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    transition: all 0.15s ease;
}

.dropdown-menu a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

.dropdown-menu a::after {
    display: none;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: #ffffff;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #ffffff;
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
}

/* ==============================
   搜索下拉
   ============================== */
.search-dropdown {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.25s ease;
}

.search-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.search-form-inline {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 0 10px;
}

.search-input-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon-inside {
    position: absolute;
    left: 14px;
    color: rgba(255, 255, 255, 0.4);
    pointer-events: none;
    transition: color 0.2s ease;
}

.search-input-wrapper:focus-within .search-icon-inside {
    color: rgba(255, 255, 255, 0.7);
}

.search-input-inline {
    width: 100%;
    padding: 10px 14px 10px 42px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.06);
    color: #ffffff;
    font-size: 0.95rem;
    outline: none;
    transition: all 0.2s ease;
}

.search-input-inline::placeholder {
    color: rgba(255, 255, 255, 0.35);
}

.search-input-inline:focus {
    border-color: rgba(99, 102, 241, 0.5);
    background: rgba(255, 255, 255, 0.1);
}

.search-submit-inline {
    padding: 10px 22px;
    background: var(--accent-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: opacity 0.2s ease;
    white-space: nowrap;
}

.search-submit-inline:hover {
    opacity: 0.9;
}

/* 热门搜索 */
.search-hot {
    padding: 4px 0 14px;
}

.search-hot-title {
    display: block;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.4);
    font-weight: 500;
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.search-hot-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.search-hot-tag {
    display: inline-block;
    padding: 5px 14px;
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.8rem;
    text-decoration: none;
    transition: all 0.2s ease;
}

.search-hot-tag:hover {
    background: rgba(255, 255, 255, 0.14);
    border-color: rgba(255, 255, 255, 0.2);
    color: #ffffff;
}

.search-hot-empty {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.25);
}

/* ==============================
   用户下拉菜单
   ============================== */
.user-dropdown .dropdown-menu {
    right: 0;
    left: auto;
    min-width: 180px;
}

.user-dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-menu-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 12px 4px;
}

.user-menu-info img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.user-menu-name {
    font-weight: 600;
    color: #ffffff;
    font-size: 0.875rem;
}

.user-menu-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: 6px 8px;
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all 0.15s ease;
}

.user-menu-item svg {
    flex-shrink: 0;
    color: rgba(255, 255, 255, 0.6);
}

.user-menu-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

.user-menu-item:hover svg {
    color: #ffffff;
}

.user-menu-item.logout {
    color: #f87171;
}

.user-menu-item.logout svg {
    color: #f87171;
}

.user-menu-item.logout:hover {
    background: rgba(248, 113, 113, 0.1);
    color: #fca5a5;
}

.user-menu-item.logout:hover svg {
    color: #fca5a5;
}

/* 用户下拉箭头 */
.user-dropdown .dropdown-toggle::after {
    display: none;
}

/* 发文章按钮 */
.write-post-btn {
    color: #ffffff;
}

.write-post-btn:hover {
    background: rgba(99, 102, 241, 0.3);
    color: #ffffff;
}