/* 导航栏基础样式 */
:root {
    --nav-height: 48px;
    --nav-auth-cta-width: 132px;
    --nav-auth-cta-width-sm: 96px;
}
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--layer-blur-bg);
    backdrop-filter: saturate(180%) blur(var(--backdrop-blur));
    -webkit-backdrop-filter: saturate(180%) blur(var(--backdrop-blur));
    border-bottom: 1px solid var(--color-border);
    transition: background-color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    /* Stabilize layout across theme switches without clipping popovers */
    /* Avoid 'paint' containment which clips absolutely-positioned dropdowns */
    contain: layout style;
    /* Enable container queries for overflow-free, CSS-only nav collapsing */
    container-type: inline-size;
    container-name: nav;
    overflow: visible;
}

/* Logo样式 */
.nav-logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--color-text);
    -webkit-tap-highlight-color: transparent;
}

.logo-img {
    display: block;
    width: 28px;
    height: 28px;
    flex: 0 0 28px;
    margin-right: 8px;
    transition: transform 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.logo-text {
    font-size: 17px;
    font-weight: 600;
    letter-spacing: -0.022em;
}

/* 主导航菜单 */
.nav-menu {
    display: flex;
    gap: 32px;
    margin: 0 48px;
    flex: 1 1 auto;
    min-width: 0; /* allow menu to shrink without wrapping container */
    justify-content: center;
    flex-wrap: nowrap;            /* keep in one row */
    overflow: visible;            /* no horizontal scroll; CSS collapse plan moves items to More */
}

/* Light mode: compact the menu footprint (links have background + padding) */
html[data-theme="light"] .nav-menu {
    gap: 24px;
}

/* More dropdown defaults hidden; revealed by generated container-query collapse CSS. */
.nav-more { display: none; }
.nav-more .dropdown-item { display: none; }
.nav-more .dropdown-item.label { display: none; }

.nav-menu::-webkit-scrollbar { display: none; }

.nav-logo, .nav-actions { flex: 0 0 auto; }

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    flex: 0 0 auto;               /* prevent flex shrinking overlap */
    padding: 8px 0;
    transition: color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
    letter-spacing: -0.016em;
    -webkit-tap-highlight-color: transparent;
    white-space: nowrap; /* prevent line breaks on theme switch */
    display: inline-flex;          /* 确保图标与文字沿中线对齐 */
    align-items: center;
    gap: 6px;
    line-height: 1.2;             /* 提供更充裕的行高，避免图标视觉裁切 */
}

.nav-link:hover {
    color: var(--color-accent);
}

/* 下拉菜单样式 */
.nav-dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    touch-action: manipulation;
}

.nav-icon {
    display: inline-block;
    flex: 0 0 auto;
    color: currentColor;
}

.dropdown-toggle .nav-icon-chevron,
.dropdown-toggle i {
    width: 12px;
    height: 12px;
    transition: transform 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.dropdown-toggle.active .nav-icon-chevron,
.dropdown-toggle.active i {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--layer-blur-bg-strong);
    backdrop-filter: saturate(180%) blur(var(--backdrop-blur));
    -webkit-backdrop-filter: saturate(180%) blur(var(--backdrop-blur));
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 8px 0;
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(-10px);
    will-change: transform, opacity;
    transition: all 0.18s cubic-bezier(0.28, 0.11, 0.32, 1);
    box-shadow: var(--shadow-lg);
    margin-top: 8px;
}

/* Label inside More dropdown to group children of collapsed dropdowns */
.dropdown-item.label {
    font-weight: 600;
    color: var(--color-text);
    cursor: default;
    pointer-events: none;
    opacity: 0.9;
}

.dropdown-menu.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}

.dropdown-item {
    display: block;
    color: var(--color-text);
    text-decoration: none;
    padding: 8px 16px;
    font-size: 14px;
    letter-spacing: -0.016em;
    transition: background-color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
    -webkit-tap-highlight-color: transparent;
}

.dropdown-item:hover {
    background-color: var(--surface-hover);
    color: var(--color-accent);
}

/* 移动版下拉菜单样式 */
.mobile-dropdown {
    border-bottom: 1px solid var(--color-border);
}

.mobile-dropdown:last-child {
    border-bottom: none;
}

.mobile-dropdown .dropdown-toggle {
    justify-content: space-between;
}

.mobile-dropdown-menu {
    max-height: 0;
    overflow: hidden;
    background: var(--surface-overlay);
    transition: max-height 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.mobile-dropdown-menu.active {
    max-height: 300px;
}

.mobile-dropdown-item {
    display: block;
    color: var(--color-text);
    text-decoration: none;
    padding: 12px 24px 12px 48px;
    font-size: 15px;
    letter-spacing: -0.020em;
    transition: background-color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
    -webkit-tap-highlight-color: transparent;
    border-left: 2px solid transparent;
}

.mobile-dropdown-item:hover {
    background-color: var(--surface-hover);
    border-left-color: var(--color-accent);
    color: var(--color-accent);
}

/* 右侧操作区 */
.nav-actions {
    display: flex;
    align-items: center;
    /* 进一步收紧右侧集群间距 */
    gap: 12px;
}

.site-theme-selector {
    height: 32px;
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 3px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--surface-subtle);
    flex: 0 0 auto;
}

.site-theme-selector--drawer {
    display: none;
}

.site-theme-option {
    width: 24px;
    height: 24px;
    display: inline-grid;
    place-items: center;
    border: 0;
    border-radius: 6px;
    background: transparent;
    padding: 0;
    cursor: pointer;
    color: var(--color-text);
    transition: background 0.2s, box-shadow 0.2s, transform 0.2s;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.site-theme-option:hover,
.site-theme-option:focus-visible {
    background: color-mix(in srgb, var(--color-accent) 14%, transparent);
    outline: none;
}

.site-theme-option:focus-visible {
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 28%, transparent);
}

.site-theme-option[aria-pressed="true"],
html:not([data-site-theme]) .site-theme-option[data-site-theme-option="default"],
html[data-site-theme="default"] .site-theme-option[data-site-theme-option="default"],
html[data-site-theme="brand-blue"] .site-theme-option[data-site-theme-option="brand-blue"] {
    background: color-mix(in srgb, var(--color-accent) 18%, transparent);
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--color-accent) 55%, transparent);
}

.site-theme-option:active {
    transform: scale(0.96);
}

.site-theme-swatch {
    width: 14px;
    height: 14px;
    display: block;
    border-radius: 50%;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.32), 0 0 0 1px rgba(0, 0, 0, 0.18);
}

.site-theme-swatch--default {
    background: linear-gradient(135deg, #ff2d55 0%, #ff577e 58%, #d70040 100%);
}

.site-theme-swatch--brand-blue {
    background: linear-gradient(135deg, #007aff 0%, #3a95ff 52%, #2563eb 100%);
}

/* Ensure language selector starts right cluster; keep fixed spacing before auth CTA */
.nav-actions .language-selector { order: 9900; margin-left: auto; margin-right: var(--nav-actions-gap-after-lang, 8px); }
.nav-actions .nav-auth-island,
.nav-actions .dashboard-btn,
.nav-actions .login-btn { order: 9999; }

/* Auth CTA keeps the same reserved slot while session runtime resolves. */
.nav-actions .nav-auth-island,
.nav-actions .login-btn,
.nav-actions .dashboard-btn.btn-primary {
    flex: 0 0 var(--nav-auth-cta-width);
    width: var(--nav-auth-cta-width);
    min-width: var(--nav-auth-cta-width);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-actions .nav-auth-island {
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.nav-actions .nav-auth-island[data-auth-state="pending"] {
    pointer-events: none;
}

.nav-actions .nav-auth-island .login-btn,
.nav-actions .nav-auth-island .dashboard-btn.btn-primary {
    flex-basis: 100%;
    width: 100%;
    min-width: 100%;
}

/* Login CTA：与 Dashboard 和语言选择器等高（32px），视觉对齐 */
.nav-actions .login-btn {
    height: 32px;
    padding: 0 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    line-height: 1;
    /* 统一为小圆角 */
    border-radius: var(--radius-sm);
}

/* Dashboard 主按钮：与 Login 和语言选择器等高（32px），视觉对齐 */
.nav-actions .btn,
.nav-actions .dashboard-btn {
    height: 32px;
    padding: 0 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    line-height: 1; /* 保证垂直居中 */
    /* 统一使用全站按钮的胶囊圆角（由 .btn 定义为 980px） */
}

/* 顶部 Dashboard 按钮：使用主题主色，但回归小圆角（与早期样式一致） */
.nav-actions .dashboard-btn { border-radius: var(--radius-sm); }
.nav-actions .dashboard-btn.btn-primary {
    /* 仅保留交互细节，颜色等继承 base.css 的 .btn/.btn-primary */
    transition: transform 0.2s cubic-bezier(0.28, 0.11, 0.32, 1);
}
/* hover/active 的位移小一点，避免导航高度抖动 */
.nav-actions .dashboard-btn.btn-primary:hover { transform: translateY(-0.5px); }
.nav-actions .dashboard-btn.btn-primary:active { transform: translateY(0); }

/* 在导航条上 hover/active 略微减小位移，避免高度抖动 */
.nav-actions .btn-primary:hover {
    transform: translateY(-0.5px);
}

/* Theme toggle button (defined once; see bottom for theme-switching rule) */

/* 语言选择器 */
.language-selector {
    position: relative;
    display: inline-flex;
    align-items: center;
    height: 32px;
    padding: 0 8px;
    /* 与导航右上 Dashboard 按钮一致的小圆角 */
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--layer-blur-bg);
    backdrop-filter: saturate(180%) blur(24px);
    -webkit-backdrop-filter: saturate(180%) blur(24px);
    transition: background-color 0.2s cubic-bezier(0.28, 0.11, 0.32, 1), box-shadow 0.2s cubic-bezier(0.28, 0.11, 0.32, 1), border-color 0.2s cubic-bezier(0.28, 0.11, 0.32, 1), opacity 0.2s cubic-bezier(0.28, 0.11, 0.32, 1);
}
.language-selector .icon-globe{
    color: var(--color-text);
    opacity: 0.85;
    margin-right: 6px;
    width: 14px;
    height: 14px;
}
.language-selector select {
    background: transparent !important;
    border: 0;
    /* 选择器内核也使用与 Dashboard 一致的小圆角 */
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-size: 14px;
    font-weight: 500;
    height: 100%;
    padding: 0 24px 0 6px;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23fff' d='M6 8L2 4h8z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 6px center;
    transition: all 0.2s cubic-bezier(0.28, 0.11, 0.32, 1);
    letter-spacing: -0.016em;
    outline: none;
    /* Fix width to avoid jitter across languages; allow override via CSS var */
    width: var(--lang-select-width, 12ch);
    min-width: var(--lang-select-width, 12ch);
    max-width: var(--lang-select-width, 12ch);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Overlay short language code (used on small screens) */
.language-selector .lang-code {
    display: none;
}

/* 语言选择器下拉选项的磨砂效果 */
.language-selector select option {
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--color-text);
    padding: 8px 12px;
}

/* Light mode language selector */
html[data-theme="light"] .language-selector {
    background: var(--layer-blur-bg);
    backdrop-filter: saturate(180%) blur(24px);
    -webkit-backdrop-filter: saturate(180%) blur(24px);
    border: 1px solid var(--color-border);
}
html[data-theme="light"] .language-selector select { color: var(--color-text); background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%231d1d1f' d='M6 8L2 4h8z'/%3E%3C/svg%3E"); }
html[data-theme="light"] .language-selector .icon-globe { color: var(--color-text); opacity: 0.9; }

/* 亮色模式下拉选项的磨砂效果 */
html[data-theme="light"] .language-selector select option {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--color-text);
}

/* Keep select transparent to preserve frosted glass; move hover effects to container */
.language-selector select:hover { background-color: transparent; box-shadow: none; }
.language-selector:hover,
.language-selector:focus-within {
    background: var(--surface-hover);
    border-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

/* Light theme: hover/focus uses blue border (no opacity changes) */
html[data-theme="light"] .language-selector:hover,
html[data-theme="light"] .language-selector:focus-within {
    border-color: var(--color-accent);
}

/* Hover/focus: make language selector text/icon blue */
.language-selector:hover .icon-globe,
.language-selector:focus-within .icon-globe,
.language-selector:hover select,
.language-selector:focus-within select,
.language-selector:hover .lang-code,
.language-selector:focus-within .lang-code {
    color: var(--color-accent);
}

/* WebKit: ensure select text fill follows color */
.language-selector:hover select,
.language-selector:focus-within select {
    -webkit-text-fill-color: var(--color-accent);
}

/* Light mode: explicitly override any light-theme color rules */
html[data-theme="light"] .language-selector:hover .icon-globe,
html[data-theme="light"] .language-selector:focus-within .icon-globe,
html[data-theme="light"] .language-selector:hover select,
html[data-theme="light"] .language-selector:focus-within select,
html[data-theme="light"] .language-selector:hover .lang-code,
html[data-theme="light"] .language-selector:focus-within .lang-code {
    color: var(--color-accent);
    -webkit-text-fill-color: var(--color-accent);
}

/* Focus ring: 深色模式保留高亮，浅色模式下取消粉色描边 */
html[data-theme="dark"] .language-selector select:focus-visible {
    outline: 2px solid transparent;
    box-shadow: 0 0 0 3px var(--accent-tint-20);
}

html[data-theme="light"] .language-selector select:focus-visible {
    outline: none;
    box-shadow: none;
}

/* Mobile: full-width selector inside mobile menu */
.mobile-menu .language-selector select {
    width: 100%;
    min-width: 0;
    max-width: none;
}

@media (max-width: 768px) {
  .language-selector select {
    /* Slightly smaller fixed width on mobile */
    width: var(--lang-select-width-sm, 8ch);
    min-width: var(--lang-select-width-sm, 8ch);
    max-width: var(--lang-select-width-sm, 8ch);
  }
  /* Smaller fixed spacing between language selector and CTA on mobile */
  .nav-actions .language-selector { margin-right: var(--nav-actions-gap-after-lang-sm, 8px); }
}

/* 登录按钮 */
.login-btn {
    background: var(--color-accent);
    color: var(--color-text);
    text-decoration: none;
    padding: 8px 20px;
    border-radius: 980px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
    letter-spacing: -0.016em;
    -webkit-tap-highlight-color: transparent;
}

.login-btn:hover {
    background: var(--color-accent-strong);
    transform: translateY(-1px);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    padding: 12px;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.menu-icon {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    position: relative;
    transition: background-color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.menu-icon::before,
.menu-icon::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: transform 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.menu-icon::before {
    top: -6px;
}

.menu-icon::after {
    bottom: -6px;
}

/* 移动端菜单打开状态 */
.mobile-menu-btn.active .menu-icon {
    background: transparent;
}

.mobile-menu-btn.active .menu-icon::before {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-btn.active .menu-icon::after {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* 移动端菜单 */
.mobile-menu {
    display: none;
    position: fixed;
    top: calc(var(--nav-height) + var(--lang-rec-banner-height, 0px));
    left: 0;
    right: 0;
    background: var(--layer-blur-bg-strong);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-top: 1px solid var(--color-border);
    padding: 8px 0;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.mobile-menu.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.mobile-menu-content {
    display: flex;
    flex-direction: column;
    padding: 0;
}

.mobile-link {
    color: var(--color-text);
    text-decoration: none;
    font-size: 17px;
    padding: 12px 24px;
    letter-spacing: -0.022em;
    position: relative;
    -webkit-tap-highlight-color: transparent;
    transition: background-color 0.3s cubic-bezier(0.28, 0.11, 0.32, 1);
}

.mobile-link.mobile-theme-toggle {
    width: 100%;
    background: transparent;
    border: 0;
    text-align: left;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    padding: 12px 24px;
    font-size: 17px;
    letter-spacing: -0.022em;
    min-height: 49.5px;
}

.mobile-theme-toggle-icons {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    opacity: 0.9;
    margin-left: 12px;
}

.mobile-theme-palette {
    width: 100%;
    min-height: 49.5px;
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    color: var(--color-text);
    padding: 10px 24px;
    font-size: 17px;
    letter-spacing: -0.022em;
    position: relative;
}

.mobile-theme-palette::after {
    content: '';
    position: absolute;
    left: 24px;
    right: 24px;
    bottom: 0;
    height: 1px;
    background: var(--color-border);
}

.mobile-theme-palette-label {
    min-width: 0;
}

.mobile-link::after {
    content: '';
    position: absolute;
    left: 24px;
    right: 24px;
    bottom: 0;
    height: 1px;
    background: var(--color-border);
}

.mobile-link:hover {
    background-color: var(--surface-subtle);
}

.mobile-language {
    padding: 12px 24px;
}

.mobile-language select {
    width: 100%;
    background: var(--layer-blur-bg);
    backdrop-filter: saturate(180%) blur(var(--backdrop-blur));
    -webkit-backdrop-filter: saturate(180%) blur(var(--backdrop-blur));
    border: 1px solid var(--color-border);
    border-radius: 12px;
    color: var(--color-text);
    font-size: 17px;
    font-weight: 500;
    height: 40px;
    padding: 0 40px 0 16px;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23fff' d='M6 8L2 4h8z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    letter-spacing: -0.022em;
}

/* 移动端语言选择器下拉选项的磨砂效果 */
.mobile-language select option {
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--color-text);
    padding: 12px 16px;
}

/* 响应式设计 - iPad */
@media (max-width: 1068px) {
    .nav-container {
        padding: 0 20px;
    }

    .nav-menu {
        gap: 22px;
        margin: 0 24px;
    }
}

/* Narrow desktop / large tablet: reduce spacing & font size to avoid crowding */
@media (max-width: 980px) {
    .nav-menu { gap: 18px; margin: 0 20px; }
    .nav-link { font-size: 13px; }
}

/* 响应式设计 - iPhone */
@media (max-width: 734px) {
    /* 移动端导航高度更小 */
    :root { --nav-height: 44px; }
    .nav-container {
        padding: 0 16px;
        height: var(--nav-height);
        justify-content: space-between;
        width: 100%;
    }

    .nav-menu {
        display: none;
    }

    .nav-actions {
        display: flex;
        gap: 16px;
        align-items: center;
    }

    /* Mobile: move theme toggle into drawer menu (override generic `.theme-toggle { display: inline-flex; }`). */
    .theme-toggle.theme-toggle--header { display: none; }
    .site-theme-selector--header { display: none; }
    .mobile-theme-palette { display: flex; }
    .mobile-theme-palette .site-theme-selector--drawer { display: inline-flex; }

    /* Show compact code overlay in top bar on small screens */
    .nav-actions .language-selector { display: inline-flex; position: relative; }
    .language-selector .lang-code {
        display: inline-block;
        position: absolute;
        left: 24px; /* roughly after globe icon + gap */
        top: 0;
        bottom: 0;
        display: flex;
        align-items: center;
        pointer-events: none;
        font-size: 12px;
        color: var(--color-text);
	    }
	    html[data-theme="light"] .language-selector .lang-code { color: var(--color-text); }
	    /* Make selected text transparent so overlay code is visible */
	    .language-selector select { color: transparent; text-shadow: none; -webkit-text-fill-color: transparent; }
	    /* Light mode overrides select text color; re-hide it on mobile */
	    html[data-theme="light"] .language-selector select { color: transparent; -webkit-text-fill-color: transparent; }
	    /* Narrower width for code */
	    .language-selector select {
	        width: var(--lang-select-code-width, 6ch);
	        min-width: var(--lang-select-code-width, 6ch);
	        max-width: var(--lang-select-code-width, 6ch);
	        padding: 4px 20px 4px 6px;
	        font-size: 12px;
	        background-position: right 6px center;
	    }

    .language-selector select {
        padding: 4px 24px 4px 8px;
        font-size: 12px;
        background-position: right 6px center;
        /* Slightly narrower on small screens for space efficiency */
        width: var(--lang-select-width-sm, 10ch);
        min-width: var(--lang-select-width-sm, 10ch);
        max-width: var(--lang-select-width-sm, 10ch);
    }

    .login-btn {
        padding: 6px 16px;
        font-size: 12px;
    }

    .logo-img {
        width: 24px;
        height: 24px;
        flex-basis: 24px;
    }

    .logo-text {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
        padding: 8px;
        margin: 0;
    }

    .mobile-language { display: block; }
}

/* 响应式设计 - 小型iPhone */
@media (max-width: 374px) {
    .nav-container {
        padding: 0 12px;
    }

    .nav-actions {
        gap: 12px;
    }

    .language-selector select {
        padding: 4px 20px 4px 6px;
        font-size: 11px;
    }

    .login-btn {
        padding: 5px 12px;
        font-size: 11px;
    }
}

/* 添加到现有样式中 */
.nav-link[data-scroll-to],
.mobile-link[data-scroll-to] {
    cursor: pointer;
}

/* 当链接处于活动状态时的样式 */
.nav-link.active,
.mobile-link.active,
.dropdown-item.active,
.mobile-dropdown-item.active {
    color: var(--color-accent);
}

/* User Menu Styles */
.user-menu {
    position: relative;
}

.user-menu-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--color-accent);
    color: var(--color-text);
    border: none;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.28, 0.11, 0.32, 1);
    touch-action: manipulation;
}

/* 预留图标占位，避免字体晚加载引起的布局抖动 */
.user-menu-btn i {
    width: 12px;               /* 与图标尺寸匹配的固定宽度 */
    display: inline-block;
    text-align: center;
}

.user-menu-btn:hover {
    background: var(--color-accent-strong);
}

.user-email {
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-menu-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: var(--layer-blur-bg-strong);
    backdrop-filter: saturate(180%) blur(20px);
    border-radius: 12px;
    min-width: 200px;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    will-change: transform, opacity;
    transition: all 0.18s cubic-bezier(0.28, 0.11, 0.32, 1);
    z-index: 1000;
}

.user-menu-dropdown.active,
.user-menu-dropdown[data-site-ui-open="1"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--color-text);
    text-decoration: none;
    font-size: 14px;
    transition: background-color 0.2s ease;
}

.user-menu-item:hover {
    background: var(--surface-hover);
}

.user-menu-item i {
    width: 16px;
    text-align: center;
}

.user-menu-divider {
    height: 1px;
    background: var(--color-border);
    margin: 4px 0;
}

/* 响应式调整 */
@media (max-width: 734px) {
    .user-menu-btn {
        padding: 6px 12px;
        font-size: 12px;
    }

    .user-email {
        max-width: 120px;
    }
}

.theme-toggle {
    height: 32px;
    min-width: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 1px solid var(--color-border);
    background: var(--surface-subtle);
    color: var(--color-text);
    border-radius: var(--radius-sm); /* match Dashboard button */
    padding: 0 10px;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s, color 0.2s;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
    background: var(--surface-hover);
    border-color: var(--color-accent);
    color: var(--color-accent);
    outline: none;
}

.theme-toggle:focus-visible {
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 28%, transparent);
}

.theme-toggle .theme-toggle-icon {
    pointer-events: none;
    width: 16px;
    text-align: center;
    display: inline-block;
    flex: 0 0 16px;
}

.theme-toggle-icon-stack {
    display: inline-grid;
    place-items: center;
    width: 16px;
    height: 16px;
    flex: 0 0 16px;
    line-height: 1;
}

.theme-toggle-icon-stack .theme-toggle-icon {
    grid-area: 1 / 1;
    width: 16px;
    height: 16px;
    opacity: 0;
    visibility: hidden;
    display: block;
}

html:not([data-theme]) .theme-toggle-icon--sun,
html[data-theme="dark"] .theme-toggle-icon--sun,
html[data-theme="light"] .theme-toggle-icon--moon {
    opacity: 1;
    visibility: visible;
}

/* During theme switch, disable transitions inside nav to avoid layout flicker */
html.theme-switching .nav, html.theme-switching .nav * { transition: none !important; }
/* During language switch (pre-navigation), also disable transitions to avoid micro-jitters */
html.lang-switching .nav, html.lang-switching .nav * { transition: none !important; }

/* Language-specific typographic tweaks */
/* Slightly bolder for Japanese to improve readability */
html[lang="ja"] .nav-link,
html[lang="ja"] .dropdown-item,
html[lang="ja"] .mobile-link { font-weight: 600; }

/* 通用：在导航内的 Font Awesome 图标预留宽度，减少 FOUT/FOIT 造成的闪动 */
.nav .fa, .nav .fas, .nav .fab, .nav .far, .nav .fal {
    display: inline-block;
    width: 1em;        /* 以当前字号的 1em 预留占位 */
    text-align: center;
}

/* 业务可选：Discord 图标预留固定宽度（若存在） */
.nav-actions .nav-discord i { width: 18px; display: inline-block; }
.nav-actions .nav-discord {
    height: 32px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    overflow: visible;
    padding: 0 10px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--surface-subtle);
    transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}
.nav-actions .nav-discord svg { width: 1em; height: 1em; display: inline-block; vertical-align: middle; overflow: visible; }
.nav-actions .nav-discord:hover,
.nav-actions .nav-discord:focus-visible {
    background: var(--surface-hover);
    border-color: var(--color-accent);
    color: var(--color-accent);
    outline: none;
}

.nav-actions .nav-discord:focus-visible {
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 28%, transparent);
}

/* 小屏仅显示图标，隐藏导航栏中的“加入 Discord”文字 */
@media (max-width: 768px) {
  .nav-discord-text { display: none; }
}

/* 内联 SVG 图标的对齐与尺寸（用于下拉箭头） */
.icon-chevron { vertical-align: middle; }

/* Light mode navigation enhancements */
html[data-theme="light"] .nav {
    /* More translucent at page top to let the backdrop breathe through */
    background: rgba(255, 255, 255, 0.72);
    background: color-mix(in srgb, var(--color-bg) 62%, transparent);
    /* Remove the 1px “separator line” at the top of the page; re-add on scroll. */
    border-bottom: 1px solid transparent;
    box-shadow: none;
}

/* When scrolling, slightly increase opacity + add depth (matches iOS Safari feel) */
html[data-theme="light"] .nav.scrolled {
    background: rgba(255, 255, 255, 0.88);
    background: color-mix(in srgb, var(--color-bg) 84%, transparent);
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

/* Arabic typographic tweaks: avoid negative tracking */
html[dir="rtl"] .nav-link,
html[dir="rtl"] .dropdown-item,
html[dir="rtl"] .mobile-link,
html[dir="rtl"] .user-menu-item,
html[dir="rtl"] .user-email { letter-spacing: 0; }

html[data-theme="light"] .nav-link,
html[data-theme="light"] .mobile-link,
html[data-theme="light"] .dropdown-item,
html[data-theme="light"] .mobile-dropdown-item {
    color: var(--color-text);
}

html[data-theme="light"] .nav-link:hover,
html[data-theme="light"] .mobile-link:hover,
html[data-theme="light"] .dropdown-item:hover,
html[data-theme="light"] .mobile-dropdown-item:hover {
    color: var(--color-accent);
}

/* Light mode: nav-menu items use gray text by default; hover/active get blue-tinted background */
html[data-theme="light"] .nav-menu .nav-link {
    color: var(--color-muted);
    padding: 8px 8px;
    border-radius: 8px;
    transition: color 0.2s cubic-bezier(0.28, 0.11, 0.32, 1), background-color 0.2s cubic-bezier(0.28, 0.11, 0.32, 1);
}
html[data-theme="light"] .nav-menu .nav-link:hover,
html[data-theme="light"] .nav-menu .nav-link:focus-visible {
    color: var(--color-accent);
    background: rgba(0, 122, 255, 0.12);
    background: color-mix(in srgb, var(--color-accent) 16%, transparent);
}
html[data-theme="light"] .nav-menu .nav-link.active {
    color: var(--color-accent);
    background: rgba(0, 122, 255, 0.12);
    background: color-mix(in srgb, var(--color-accent) 16%, transparent);
}

html[data-theme="light"] .dropdown-item.active,
html[data-theme="light"] .mobile-dropdown-item.active {
    color: var(--color-accent);
    background: color-mix(in srgb, var(--color-accent) 12%, transparent);
}

html[data-theme="light"] .dropdown-menu,
html[data-theme="light"] .mobile-menu {
    background: rgba(255, 255, 255, 0.95);
    border-color: rgba(0, 0, 0, 0.06);
}

html[data-theme="light"] .login-btn {
    background: var(--color-accent);
    color: #ffffff;
}

html[data-theme="light"] .login-btn:hover {
    background: var(--color-accent-strong);
}

/* Ensure Dashboard CTA text is always visible in light mode (blue brand) */
html[data-theme="light"] .nav-actions .dashboard-btn.btn-primary {
    background: var(--color-accent);
    color: #ffffff;
}

html[data-theme="light"] .theme-toggle {
    border-color: rgba(0, 0, 0, 0.12);
    color: var(--color-text);
}

html[data-theme="light"] .theme-toggle:hover {
    background: rgba(0, 0, 0, 0.04);
    color: var(--color-accent);
}

html[data-theme="light"] .site-theme-selector {
    background: rgba(0, 0, 0, 0.03);
    border-color: rgba(0, 0, 0, 0.12);
}

html[data-theme="light"] .site-theme-option:hover,
html[data-theme="light"] .site-theme-option:focus-visible {
    background: color-mix(in srgb, var(--color-accent) 12%, transparent);
}

html[data-theme="light"] .mobile-theme-palette::after {
    background: rgba(0, 0, 0, 0.06);
}

html[data-theme="light"] .menu-icon,
html[data-theme="light"] .menu-icon::before,
html[data-theme="light"] .menu-icon::after {
    background: var(--color-text);
}

html[data-theme="light"] .mobile-link::after {
    background: rgba(0, 0, 0, 0.06);
}

html[data-theme="light"] .mobile-language select {
    background: var(--surface-overlay);
    color: var(--color-text);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%231d1d1f' d='M6 8L2 4h8z'/%3E%3C/svg%3E");
}

/* 亮色模式移动端下拉选项的磨砂效果 */
html[data-theme="light"] .mobile-language select option {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--color-text);
}

/* ===================== */
/* RTL minimal overrides */
/* ===================== */
/* Keep actions/login on the right in RTL (do NOT reverse container order) */
html[dir="rtl"] .nav-container { flex-direction: row; }
html[dir="rtl"] .logo-img { margin-right: 0; margin-left: 8px; }
html[dir="rtl"] .language-selector .icon-globe { margin-right: 0; margin-left: 6px; }
/* Keep user menu dropdown anchored to the right edge in RTL as well */
html[dir="rtl"] .user-menu-dropdown { right: 0; left: auto; }
/* Mobile dropdown indentation/border swap */
html[dir="rtl"] .mobile-dropdown-item { padding: 12px 48px 12px 24px; border-left: 0; border-right: 2px solid transparent; }
html[dir="rtl"] .mobile-dropdown-item:hover { border-right-color: var(--color-accent); }

@media (max-width: 734px) {
    .nav-actions .nav-auth-island,
    .nav-actions .login-btn,
    .nav-actions .dashboard-btn.btn-primary {
        flex-basis: var(--nav-auth-cta-width-sm);
        width: var(--nav-auth-cta-width-sm);
        min-width: var(--nav-auth-cta-width-sm);
    }
}