/* ====================================================================
   云界论坛 · 头部 / 导航 / 用户下拉 / 主题切换（v2 现代通透版）
   在 style.css 之后引入，覆盖旧头部样式。
   ==================================================================== */

/* ---------- 顶栏容器 ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    background: rgba(255, 255, 255, 0.86);
    border-bottom: 1px solid var(--border);
    backdrop-filter: saturate(160%) blur(12px);
    -webkit-backdrop-filter: saturate(160%) blur(12px);
    transition: background-color var(--transition), border-color var(--transition);
}

[data-theme="dark"] .site-header,
:root:not([data-theme="light"]) .site-header {
    background: rgba(24, 24, 27, 0.82);
}

.header-top {
    background: transparent;
    border-bottom: none;
}

.header-top-inner {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--space-5);
    height: var(--header-height);
    min-width: 0;
}

/* ---------- 品牌区 ---------- */
.brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--text);
    flex-shrink: 0;
}

.brand:hover {
    color: var(--text);
}

.brand-logo {
    width: 34px;
    height: 34px;
    display: block;
    transition: transform var(--transition);
}

.brand:hover .brand-logo {
    transform: scale(1.05) rotate(-4deg);
}

.brand-info {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}

.brand-name {
    font-size: var(--text-lg);
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.02em;
}

.brand-slogan {
    font-size: var(--text-xs);
    color: var(--text-3);
    margin-top: 2px;
    font-weight: 400;
}

/* ---------- 主导航（居中） ---------- */
.main-nav {
    display: flex;
    justify-content: center;
}

.nav-list {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
    margin: 0;
    padding: 4px;
    background: var(--surface-2);
    border-radius: var(--radius-full);
}

.nav-link {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-2);
    transition: all var(--transition);
    border: 1px solid transparent;
}

.nav-link:hover {
    background: var(--surface);
    color: var(--text);
    box-shadow: var(--shadow-sm);
}

.nav-link.active {
    background: var(--surface);
    color: var(--brand);
    box-shadow: var(--shadow-sm);
    font-weight: 600;
}

.nav-link-primary {
    background: var(--brand);
    color: var(--brand-contrast);
}

.nav-link-primary:hover {
    background: var(--brand-hover);
    color: var(--brand-contrast);
    box-shadow: 0 4px 12px var(--brand-glow);
}

.nav-link-admin {
    color: var(--brand);
}

/* ---------- 工具区 ---------- */
.header-tools {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-shrink: 0;
}

/* ---------- 搜索框 ---------- */
.header-search {
    display: flex;
    align-items: center;
    background: var(--surface-2);
    border: 1px solid transparent;
    border-radius: var(--radius-full);
    padding: 0 var(--space-1) 0 var(--space-3);
    height: 36px;
    width: 200px;
    max-width: 28vw;
    transition: all var(--transition);
}

.header-search:focus-within {
    background: var(--surface);
    border-color: var(--brand);
    box-shadow: 0 0 0 3px var(--brand-glow);
    width: 240px;
}

.header-search-input {
    flex: 1;
    min-width: 0;
    border: none;
    background: transparent;
    outline: none;
    font-size: var(--text-sm);
    color: var(--text);
    padding: 0 var(--space-2);
    height: 100%;
}

.header-search-input::placeholder {
    color: var(--text-4);
}

.header-search-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    color: var(--text-3);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
}

.header-search-btn:hover {
    background: var(--surface-3);
    color: var(--brand);
}

/* ---------- 主题切换按钮 ---------- */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: none;
    background: var(--surface-2);
    color: var(--text-2);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
}

.theme-toggle:hover {
    background: var(--surface-3);
    color: var(--brand);
}

.theme-toggle:active {
    transform: scale(0.94);
}

.theme-toggle .theme-icon-sun,
.theme-toggle .theme-icon-moon {
    transition: opacity var(--transition), transform var(--transition);
}

.theme-toggle .theme-icon-moon {
    display: none;
}

[data-theme="dark"] .theme-toggle .theme-icon-sun {
    display: none;
}

[data-theme="dark"] .theme-toggle .theme-icon-moon {
    display: block;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .theme-toggle .theme-icon-sun {
        display: none;
    }
    :root:not([data-theme="light"]) .theme-toggle .theme-icon-moon {
        display: block;
    }
}

/* ---------- 用户入口 ---------- */
.header-user {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 3px 10px 3px 3px;
    border-radius: var(--radius-full);
    color: var(--text-2);
    background: var(--surface-2);
    border: 1px solid transparent;
    transition: all var(--transition);
    cursor: pointer;
}

.header-user:hover {
    background: var(--surface);
    border-color: var(--border);
    color: var(--text);
}

.header-user-avatar {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    object-fit: cover;
    background: var(--brand);
    color: var(--brand-contrast);
    flex-shrink: 0;
}

.header-user-avatar-text {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xs);
    font-weight: 700;
}

.header-user-name {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-2);
    max-width: 110px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-dropdown-caret {
    color: var(--text-4);
    transition: transform var(--transition);
    flex-shrink: 0;
}

.header-user[aria-expanded="true"] .user-dropdown-caret {
    transform: rotate(180deg);
}

.user-dropdown {
    position: relative;
}

/* ---------- 用户下拉面板（v2：通透卡片式） ---------- */
.user-dropdown-panel {
    position: fixed;
    z-index: var(--z-dropdown);
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--space-3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px) scale(0.98);
    transform-origin: top right;
    transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s;
    width: 280px;
    max-width: calc(100vw - 2rem);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

[data-theme="dark"] .user-dropdown-panel,
:root:not([data-theme="light"]) .user-dropdown-panel {
    background: rgba(39, 39, 42, 0.96);
}

.user-dropdown-panel.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

/* 头部资料卡 */
.user-dropdown-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2);
}

.user-dropdown-avatar {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    object-fit: cover;
    background: var(--brand);
    color: var(--brand-contrast);
    flex-shrink: 0;
}

.user-dropdown-meta {
    min-width: 0;
}

.user-dropdown-name {
    font-size: var(--text-base);
    font-weight: 700;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-dropdown-role {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--text-xs);
    color: var(--text-3);
    margin-top: 2px;
    flex-wrap: wrap;
}

.user-dropdown-uid {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.6875rem;
    color: var(--text-secondary);
    background: var(--surface-2);
    padding: 0.0625rem 0.375rem;
    border-radius: var(--radius-sm);
}

.user-dropdown-role-sep {
    color: var(--border);
}

/* 统计区：简洁横向 */
.user-dropdown-panel .user-dropdown-stats {
    display: flex;
    justify-content: space-between;
    gap: var(--space-1);
    padding: var(--space-3) var(--space-2);
    margin: 0 var(--space-1);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--surface);
}

.user-dropdown-stat {
    flex: 1;
    text-align: center;
}

.user-dropdown-stat-num {
    display: block;
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--text);
    line-height: 1.2;
}

.user-dropdown-stat-label {
    display: block;
    font-size: var(--text-xs);
    color: var(--text-3);
    margin-top: 2px;
}

/* 消息/收藏 Tab */
.user-dropdown-panel .user-dropdown-tabs {
    display: flex;
    gap: var(--space-2);
    margin: var(--space-3) 0;
}

.user-dropdown-tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: var(--space-2);
    border-radius: var(--radius);
    font-size: var(--text-sm);
    color: var(--text-2);
    background: transparent;
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.user-dropdown-tab:hover {
    border-color: var(--brand);
    color: var(--brand);
    background: var(--brand-soft);
}

.user-dropdown-tab-label {
    font-weight: 500;
}

.user-dropdown-tab-count {
    color: var(--text-3);
    font-size: var(--text-xs);
}

/* 菜单项列表（强制横向图标+文字，覆盖旧 style.css 的 grid 竖排） */
.user-dropdown-panel .user-dropdown-menu {
    display: flex !important;
    flex-direction: column !important;
    gap: 2px !important;
    padding: 0 !important;
    margin: var(--space-2) 0;
}

.user-dropdown-panel .user-dropdown-menu-item {
    display: flex !important;
    flex-direction: row !important;
    align-items: center !important;
    gap: var(--space-3) !important;
    padding: var(--space-2) var(--space-3) !important;
    border-radius: var(--radius) !important;
    color: var(--text-2) !important;
    font-size: var(--text-sm) !important;
    text-align: left !important;
    transition: all var(--transition) !important;
    position: relative !important;
}

.user-dropdown-panel .user-dropdown-menu-item:hover {
    background: var(--brand-soft) !important;
    color: var(--brand) !important;
}

.user-dropdown-panel .user-dropdown-menu-item-admin {
    color: var(--brand) !important;
    background: rgba(99, 102, 241, 0.06) !important;
}

.user-dropdown-panel .user-dropdown-menu-item-admin:hover {
    background: var(--brand) !important;
    color: var(--brand-contrast) !important;
}

.user-dropdown-panel .user-dropdown-menu-item svg {
    color: var(--text-3);
    flex-shrink: 0;
    width: 18px;
    height: 18px;
}

.user-dropdown-panel .user-dropdown-menu-item:hover svg {
    color: var(--brand);
}

.user-dropdown-menu-badge {
    margin-left: auto;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    background: var(--danger);
    color: #fff;
    font-size: 11px;
    font-weight: 600;
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

/* 退出按钮 */
.user-dropdown-logout {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: var(--space-2) var(--space-3);
    margin-top: var(--space-2);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-2);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: all var(--transition);
    cursor: pointer;
}

.user-dropdown-logout:hover {
    background: var(--danger-light);
    border-color: transparent;
    color: var(--danger);
}

/* ---------- 移动端菜单按钮 ---------- */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 36px;
    height: 36px;
    padding: 0 8px;
    background: var(--surface-2);
    border: 1px solid transparent;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition);
}

.nav-toggle:hover {
    background: var(--surface-3);
}

.nav-toggle-bar {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--text-2);
    border-radius: 2px;
    transition: all var(--transition);
    margin: 0 auto;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* ---------- 移动端响应式 ---------- */
@media (max-width: 920px) {
    .header-top-inner {
        gap: var(--space-4);
    }

    .main-nav {
        display: none;
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        z-index: var(--z-drawer);
        background: var(--surface);
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-slow);
    }

    .main-nav.open {
        display: block;
        max-height: 80vh;
    }

    .main-nav .nav-list {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-1);
        background: transparent;
        padding: var(--space-3) var(--space-4);
        border-radius: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .header-search {
        width: 160px;
        max-width: 36vw;
    }

    .header-search:focus-within {
        width: 190px;
    }
}

@media (max-width: 768px) {
    .header-search {
        display: none;
    }

    .header-user-name {
        display: none;
    }

    .brand-slogan {
        display: none;
    }

    .nav-link {
        padding: var(--space-3) var(--space-4);
        border-radius: var(--radius);
    }

    .nav-link:hover,
    .nav-link.active {
        box-shadow: none;
    }
}

@media (max-width: 480px) {
    .brand-name {
        font-size: var(--text-base);
    }
}