:root {
    --tv-color-bg: #000000;
    --tv-color-text: #ffffff;
    --tv-color-text-secondary: #b2b5be;
    --tv-color-brand: #2962ff;
    --tv-color-brand-hover: #1e53e5;
    --tv-color-border: #2a2e39;
    --tv-color-card-bg: #1e222d;
    --tv-color-card-hover: #2a2e39;
    --tv-font-family: -apple-system, BlinkMacSystemFont, "Trebuchet MS", Roboto, Ubuntu, sans-serif;
    --tv-header-height: 64px;

    /* Landing Page Compatibility Variables */
    --primary-color: #2962ff;
    --primary-hover: #1e53e5;
    --bg-color: #000000;
    --text-primary: #ffffff;
    --text-secondary: #b2b5be;
    --surface-color: #1e222d;
    --border-color: #2a2e39;
    --header-height: 64px;
}

:root[data-theme="light"] {
    --tv-color-bg: #ffffff;
    --tv-color-text: #111111;
    --tv-color-text-secondary: #5c5f6a;
    --tv-color-brand: #2962ff;
    --tv-color-brand-hover: #1e53e5;
    --tv-color-border: #e6e8ee;
    --tv-color-card-bg: #f6f7fb;
    --tv-color-card-hover: #eef0f6;

    /* Landing Page Compatibility Variables */
    --bg-color: #ffffff;
    --text-primary: #111111;
    --text-secondary: #5c5f6a;
    --surface-color: #f6f7fb;
    --border-color: #e6e8ee;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--tv-font-family);
    background-color: var(--tv-color-bg);
    color: var(--tv-color-text);
    line-height: 1.5;
}

/* New Landing Header (Homepage Reconstruction) */
.landing-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 5000;
    background: rgba(var(--bg-white-rgb, 0, 0, 0), 0.72);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.2s;
    height: var(--header-height);
}

:root[data-theme="light"] .landing-header {
    background: rgba(255, 255, 255, 0.82);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
    transition: opacity 0.2s;
}

.brand:hover {
    opacity: 0.8;
}

.brand-logo {
    width: 32px;
    height: 32px;
    background: var(--surface-color);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

:root:not([data-theme="light"]) .brand-logo img {
    filter: invert(1);
}

.brand-text {
    font-size: 16px;
    font-weight: 500;
}

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

.action-item {
    position: relative;
    display: flex;
    align-items: center;
}

.icon-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    padding: 0;
    outline: none;
}

.icon-btn:hover,
.icon-btn.active {
    background: rgba(128, 128, 128, 0.1);
    border-color: var(--border-color);
    color: var(--text-primary);
}

/* Dropdown Panel */
.dropdown-panel {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    min-width: 160px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    z-index: 10000;
    overflow: hidden;
    padding: 4px;
    animation: fadeIn 0.2s ease-out;
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown-section {
    display: flex;
    flex-direction: column;
}

.dropdown-title {
    padding: 8px 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}

.dropdown-item {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    width: 100%;
    text-align: left;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 14px;
    border-radius: 4px;
    transition: background-color 0.12s, color 0.12s;
}

.dropdown-item:hover {
    background-color: var(--tv-color-card-hover);
}

.dropdown-item:focus-visible {
    outline: 2px solid rgba(41, 98, 255, 0.6);
    outline-offset: 0;
    background-color: var(--tv-color-card-hover);
}

.dropdown-item.active {
    background: rgba(41, 98, 255, 0.1);
    color: var(--primary-color);
    font-weight: 500;
}

.dropdown-item.active:hover {
    background: rgba(41, 98, 255, 0.16);
}

.nav-item {
    font-size: 14px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-item:hover {
    color: var(--text-primary);
}

.btn-start-custom {
    background: #2563eb;
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 500;
    transition: background-color 0.2s;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
}

.btn-start-custom:hover {
    background: #1d4ed8;
}

/* Hide old header */
.tv-header {
    display: none;
}

.tv-main {
    padding-top: var(--header-height);
}

.tv-header__logo {
    color: var(--tv-color-text);
    text-decoration: none;
}

.tv-header__logo text {
    fill: currentColor;
}

.tv-header__left,
.tv-header__right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.tv-header__menu-container {
    display: none;
}

.tv-header__menu-btn,
.tv-header__user-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--tv-color-text);
    padding: 6px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
}

.tv-header__menu-btn svg,
.tv-header__user-btn svg {
    width: 18px;
    height: 18px;
}

.tv-header__search-btn {
    display: none !important;
}

.tv-header__menu-btn:hover,
.tv-header__user-btn:hover {
    background-color: rgba(255, 255, 255, 0.08);
}

:root[data-theme="light"] .tv-header__menu-btn:hover,
:root[data-theme="light"] .tv-header__user-btn:hover {
    background-color: rgba(0, 0, 0, 0.06);
}

.tv-header__logo svg {
    height: 20px;
}

.tv-theme-menu {
    position: relative;
}

.tv-theme-menu__btn {
    width: 32px;
    height: 32px;
    padding: 6px;
    border-radius: 10px;
    border: 1px solid rgba(0, 0, 0, 0.00);
    background: transparent;
    color: var(--tv-color-text);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

:root[data-theme="light"] .tv-theme-menu__btn {
    border: 1px solid rgba(0, 0, 0, 0.00);
    background: transparent;
}

.tv-theme-menu__btn:hover {
    background: rgba(0, 0, 0, 0.06);
}

:root[data-theme="light"] .tv-theme-menu__btn:hover {
    background: rgba(0, 0, 0, 0.06);
}

.tv-theme-menu__panel {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 220px;
    padding: 10px;
    border-radius: 14px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.18);
    display: none;
    z-index: 2000;
}

:root[data-theme="light"] .tv-theme-menu__panel {
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.18);
}

:root:not([data-theme="light"]) .tv-theme-menu__panel {
    border: 1px solid rgba(255, 255, 255, 0.10);
    background: rgba(0, 0, 0, 0.92);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.40);
}

.tv-theme-menu__panel.is-open {
    display: block;
}

.tv-theme-menu__title {
    font-size: 12px;
    font-weight: 700;
    color: var(--tv-color-text-secondary);
    padding: 6px 8px;
    margin-bottom: 4px;
}

.tv-theme-menu__divider {
    height: 1px;
    background: rgba(0, 0, 0, 0.08);
    margin: 8px 0;
}

:root:not([data-theme="light"]) .tv-theme-menu__divider {
    background: rgba(255, 255, 255, 0.10);
}

.tv-theme-menu__colors {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 8px 2px;
}

.tv-theme-menu__color {
    width: 18px;
    height: 18px;
    border-radius: 999px;
    border: 2px solid rgba(0, 0, 0, 0.08);
    background: var(--c, #2962ff);
    padding: 0;
    cursor: pointer;
}

.tv-theme-menu__color[data-color="#00897B"] {
    --c: #00897B;
}

.tv-theme-menu__color[data-color="#C62828"] {
    --c: #C62828;
}

.tv-theme-menu__color[data-color="#6D4C41"] {
    --c: #6D4C41;
}

.tv-theme-menu__color[data-color="#3949AB"] {
    --c: #3949AB;
}

.tv-theme-menu__color[data-color="#1E88E5"] {
    --c: #1E88E5;
}

.tv-theme-menu__color[data-color="#EF6C00"] {
    --c: #EF6C00;
}

.tv-theme-menu__color.tv-theme-menu__color--custom {
    --c: #111111;
}

:root:not([data-theme="light"]) .tv-theme-menu__color {
    border: 2px solid rgba(255, 255, 255, 0.14);
}

.tv-theme-menu__item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 10px;
    border-radius: 10px;
    border: 0;
    background: transparent;
    color: var(--tv-color-text);
    cursor: pointer;
}

.tv-theme-menu__item:hover {
    background: rgba(0, 0, 0, 0.06);
}

:root[data-theme="light"] .tv-theme-menu__item:hover {
    background: rgba(0, 0, 0, 0.06);
}

:root:not([data-theme="light"]) .tv-theme-menu__item:hover {
    background: rgba(255, 255, 255, 0.08);
}

.tv-theme-menu__item.is-selected {
    background: rgba(41, 98, 255, 0.14);
}

.tv-theme-menu__icon {
    color: var(--tv-color-text-secondary);
    display: flex;
    align-items: center;
}

.tv-theme-menu__label {
    font-size: 14px;
    font-weight: 600;
}

/* Main Content */
.tv-main {
    min-height: calc(100vh - var(--tv-header-height));
}

/* Hero Section */
.tv-hero {
    padding: 64px 16px 48px;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.tv-hero__title {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 32px;
    letter-spacing: -0.02em;
}

.tv-search-box {
    position: relative;
    max-width: 640px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
}

.tv-search-box__icon {
    color: var(--tv-color-text-secondary);
}

/* Categories Grid (Index Page) */
.tv-categories {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px 64px;
}

.tv-categories__grid--simplified {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    max-width: 1000px;
    margin: 0 auto;
}

.tv-card--large {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 48px 32px;
    background-color: var(--tv-color-card-bg);
    border-radius: 8px;
    text-decoration: none;
    color: var(--tv-color-text);
    transition: all 0.2s;
}

.tv-card--large:hover {
    background-color: var(--tv-color-card-hover);
    transform: translateY(-4px);
}

.tv-card--large .tv-card__icon {
    font-size: 48px;
    margin-bottom: 24px;
    color: var(--tv-color-text);
}

.tv-card--large .tv-card__title {
    font-size: 20px;
    margin-bottom: 12px;
    font-weight: 600;
    color: var(--tv-color-text);
}

.tv-card__desc {
    color: var(--tv-color-text-secondary);
    font-size: 16px;
    line-height: 1.5;
}

.tv-btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 24px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: background-color 0.2s;
}

.tv-btn--primary {
    background-color: var(--tv-color-brand);
    color: #fff;
}

.tv-btn--primary:hover {
    background-color: var(--tv-color-brand-hover);
}

/* Footer */
.tv-footer {
    padding: 24px 16px;
    border-top: 1px solid var(--tv-color-border);
    text-align: center;
    color: var(--tv-color-text-secondary);
    font-size: 14px;
}

.tv-footer__container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.tv-footer__links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tv-footer__link {
    color: var(--tv-color-text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

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

.tv-footer__separator {
    color: var(--tv-color-text-secondary);
    user-select: none;
}


/* Breadcrumbs */
.tv-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

.tv-breadcrumbs {
    padding: 24px 0;
    color: var(--tv-color-text-secondary);
    font-size: 14px;
}

.tv-breadcrumbs__link {
    color: var(--tv-color-text-secondary);
    text-decoration: none;
}

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

.tv-breadcrumbs__separator {
    margin: 0 8px;
}

.tv-breadcrumbs__current {
    color: var(--tv-color-text);
}

.tv-page-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 48px;
}

/* Knowledge Base Specific Styles */
.tv-kb-search-container {
    margin-bottom: 48px;
}

.tv-kb-search {
    position: relative;
    max-width: 100%;
}

.tv-kb-search__input {
    width: 100%;
    height: 48px;
    padding: 0 16px 0 48px;
    border: 1px solid var(--tv-color-border);
    border-radius: 4px;
    background-color: transparent;
    color: var(--tv-color-text);
    font-size: 16px;
    outline: none;
}

.tv-kb-search__input:focus {
    border-color: var(--tv-color-brand);
}

.tv-kb-search__icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--tv-color-text-secondary);
}

.tv-section-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 24px;
}

.tv-kb-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    padding-bottom: 64px;
    width: 100%;
}

.tv-kb-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    background-color: var(--tv-color-card-bg);
    border-radius: 6px;
    text-decoration: none;
    color: var(--tv-color-text);
    transition: all 0.2s;
    border: 1px solid transparent;
    /* Ensure border doesn't shift layout */
}

.tv-kb-card:hover {
    background-color: var(--tv-color-card-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    border-color: var(--tv-color-border);
}

.tv-kb-card__content {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tv-kb-card__title {
    font-size: 16px;
    font-weight: 600;
    margin: 0;
}

.tv-kb-card__count {
    font-size: 14px;
    color: var(--tv-color-text-secondary);
}

.tv-kb-card__icon {
    color: var(--tv-color-text-secondary);
}

/* Highlighted Card Style */
.tv-kb-card--highlight {
    background-color: #ffffff;
    color: #131722;
}

.tv-kb-card--highlight:hover {
    background-color: #f0f3fa;
}

.tv-kb-card--highlight .tv-kb-card__title {
    color: #131722;
}

.tv-kb-card--highlight .tv-kb-card__icon {
    color: #131722;
}

/* Support Request Page Styles */
.tv-contact-section {
    display: flex;
    justify-content: center;
    padding: 48px 0 96px;
}

.tv-contact-card {
    background-color: var(--tv-color-card-bg);
    border: 1px solid var(--tv-color-border);
    border-radius: 12px;
    padding: 64px 48px;
    max-width: 600px;
    width: 100%;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.tv-contact-card__icon {
    color: var(--tv-color-brand);
    margin-bottom: 32px;
}

.tv-contact-card__title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--tv-color-text);
}

.tv-contact-card__desc {
    font-size: 16px;
    color: var(--tv-color-text-secondary);
    margin-bottom: 32px;
    line-height: 1.6;
}

.tv-contact-card__email {
    font-size: 20px;
    font-weight: 600;
    color: var(--tv-color-text);
    margin-bottom: 48px;
    padding: 16px 32px;
    background-color: var(--tv-color-card-bg);
    border-radius: 8px;
    border: 1px dashed var(--tv-color-border);
}

.tv-btn--large {
    padding: 16px 48px;
    font-size: 18px;
}

@media (max-width: 768px) {
    .tv-kb-grid {
        grid-template-columns: 1fr;
    }
}

/* Knowledge Base Cards */
.tv-kb-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 32px;
}

.tv-kb-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--tv-color-card-bg);
    padding: 24px;
    border-radius: 8px;
    text-decoration: none;
    color: var(--tv-color-text);
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.tv-kb-card:hover {
    background-color: var(--tv-color-card-hover);
    border-color: var(--tv-color-border);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.tv-kb-card__content {
    flex: 1;
}

.tv-kb-card__title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--tv-color-text);
}

.tv-kb-card__count {
    font-size: 14px;
    color: var(--tv-color-text-secondary);
}

.tv-kb-card__icon {
    margin-left: 16px;
    color: var(--tv-color-text-secondary);
    transition: color 0.2s ease;
}

.tv-kb-card:hover .tv-kb-card__icon {
    color: var(--tv-color-brand);
}

/* Knowledge Base Search */
.tv-kb-search-container {
    max-width: 600px;
    margin: 32px auto;
}

.tv-kb-search {
    position: relative;
    display: flex;
    align-items: center;
    background-color: var(--tv-color-card-bg);
    border: 1px solid var(--tv-color-border);
    border-radius: 8px;
    padding: 12px 16px;
}

.tv-kb-search__icon {
    margin-right: 12px;
    color: var(--tv-color-text-secondary);
}

.tv-kb-search__input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--tv-color-text);
    font-size: 16px;
}

.tv-kb-search__input::placeholder {
    color: var(--tv-color-text-secondary);
}

/* 
   强制覆盖规则 
   Fix: 解决部分页面因内联样式导致卡片链接显示为蓝色的问题
*/
.tv-article__content a.tv-subcat-card,
.tv-subcat-card,
.tv-subcat-title,
.tv-article__content a.tv-article-link,
.tv-article-link {
    color: var(--tv-color-text) !important;
}

.tv-article__content a.tv-subcat-card:hover,
.tv-subcat-card:hover,
.tv-article__content a.tv-article-link:hover,
.tv-article-link:hover {
    color: var(--tv-color-text) !important;
}

.tv-subcat-count {
    color: var(--tv-color-text-secondary) !important;
}

/* Dropdown Menu Styles */
.tv-header__menu-container {
    position: relative;
    display: flex;
    align-items: center;
}

.tv-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--tv-color-card-bg);
    border: 1px solid var(--tv-color-border);
    border-radius: 4px;
    padding: 8px 0;
    min-width: 160px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    display: none;
    z-index: 1000;
    margin-top: 8px;
}

.tv-dropdown-menu--active {
    display: block;
}

.tv-dropdown-item {
    display: block;
    padding: 12px 16px;
    color: var(--tv-color-text);
    text-decoration: none;
    font-size: 14px;
    transition: background-color 0.2s;
}

.tv-dropdown-item:hover {
    background-color: var(--tv-color-card-hover);
    color: var(--tv-color-brand);
}

/* Support Visual Section */
.tv-support-visual {
    padding: 0 16px 64px;
    text-align: center;
    max-width: 1200px;
    margin: 0 auto;
}

.tv-support-svg {
    width: 100%;
    height: auto;
    background: transparent;
    border: none;
    box-shadow: none;
}

.tv-support-portal .container-jFs_Bzjj,
.tv-support-portal button.roundButton-FujgyDpN {
    display: none !important;
}

/* Search Results Dropdown Styles (for article pages) */
.tv-kb-search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--tv-color-card-bg, #fff);
    border: 1px solid var(--tv-color-border, #e0e3eb);
    border-radius: 8px;
    margin-top: 8px;
    max-height: 400px;
    overflow-y: auto;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

:root[data-theme="dark"] .tv-kb-search-results,
:root:not([data-theme="light"]) .tv-kb-search-results {
    background: var(--tv-color-card-bg, #1e222d);
    border-color: var(--tv-color-border, #363a45);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.tv-kb-search-results__header {
    padding: 12px 16px;
    border-bottom: 1px solid var(--tv-color-border, #e0e3eb);
    color: var(--tv-color-text-secondary, #787b86);
    font-size: 14px;
}

.tv-kb-search-results__list {
    padding: 8px 0;
}

.tv-kb-search-result {
    display: block;
    padding: 12px 16px;
    color: var(--tv-color-text, #111827);
    text-decoration: none;
    transition: background-color 0.2s;
}

.tv-kb-search-result:hover {
    background: rgba(0, 0, 0, 0.04);
}

:root[data-theme="dark"] .tv-kb-search-result:hover,
:root:not([data-theme="light"]) .tv-kb-search-result:hover {
    background: rgba(255, 255, 255, 0.05);
}

.tv-kb-search-result__title {
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 4px;
    color: var(--tv-color-text, #111827);
}

.tv-kb-search-result__title mark {
    background: #2962ff;
    color: #fff;
    padding: 0 2px;
    border-radius: 2px;
}

.tv-kb-search-result__category {
    font-size: 12px;
    color: var(--tv-color-text-secondary, #787b86);
}

.tv-kb-search-result__summary {
    font-size: 13px;
    color: var(--tv-color-text-secondary, #787b86);
    margin-top: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.tv-kb-search-no-results {
    padding: 24px 16px;
    text-align: center;
    color: var(--tv-color-text-secondary, #787b86);
    font-size: 14px;
}

/* 移动端导航栏适配 */
@media (max-width: 768px) {

    /* 头部容器调整 */
    .header-inner {
        padding: 0 12px;
    }

    /* 品牌 Logo 调整：隐藏文字，只留 Logo */
    .brand-text {
        display: none !important;
    }

    /* 操作区调整 */
    .header-actions {
        gap: 6px;
    }

    /* 导航项：隐藏文本，只留图标 */
    .nav-item span {
        display: none !important;
    }

    .nav-item {
        padding: 6px;
        font-size: 12px;
    }

    .nav-item svg {
        width: 20px;
        height: 20px;
    }

    /* 按钮调整 */
    .btn-start-custom span {
        display: none !important;
    }

    .btn-start-custom {
        padding: 6px 8px;
        margin-left: 2px;
    }

    .btn-start-custom svg {
        margin: 0;
        width: 20px;
        height: 20px;
    }

    /* 图标按钮大小调整 */
    .icon-btn {
        width: 32px;
        height: 32px;
    }

    /* 确保原来 hidden-mobile 的元素现在显示（但仅图标） */
    .hidden-mobile {
        display: flex !important;
    }
}

/* Knowledge base: NuvexLens Apple Flat treatment. */
.knowledge-base-page {
    --tv-color-bg: #ffffff;
    --tv-color-text: #1d1d1f;
    --tv-color-text-secondary: #6e6e73;
    --tv-color-brand: #0071e3;
    --tv-color-brand-hover: #0077ed;
    --tv-color-border: #d2d2d7;
    --tv-color-card-bg: transparent;
    --tv-color-card-hover: #f5f5f7;
    --bg-color: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --surface-color: #ffffff;
    --border-color: #d2d2d7;
    background: #ffffff;
    letter-spacing: 0;
}

:root:not([data-theme="light"]) .knowledge-base-page {
    --tv-color-bg: #000000;
    --tv-color-text: #f5f5f7;
    --tv-color-text-secondary: #a1a1a6;
    --tv-color-border: #38383a;
    --tv-color-card-bg: transparent;
    --tv-color-card-hover: #1c1c1e;
    --bg-color: #000000;
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --surface-color: #000000;
    --border-color: #38383a;
    background: #000000;
}

.knowledge-base-page .landing-header {
    position: sticky;
    background: var(--tv-color-bg);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    transition: none;
}

.knowledge-base-page .brand-logo {
    background: transparent;
}

.knowledge-base-page .dropdown-panel {
    background: var(--tv-color-bg);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    animation: none;
}

.knowledge-base-page .dropdown-title {
    letter-spacing: 0;
    text-transform: none;
}

.knowledge-base-page .tv-main {
    padding-top: 0;
}

.knowledge-base-page .tv-container {
    max-width: 1040px;
    padding: 0 24px;
}

.knowledge-base-page .tv-breadcrumbs {
    padding: 28px 0 12px;
    font-size: 13px;
}

.knowledge-base-page .tv-page-title {
    margin-bottom: 24px;
    font-size: 32px;
    line-height: 1.2;
    letter-spacing: 0;
}

.knowledge-base-page .tv-kb-search-container {
    position: relative;
    max-width: none;
    margin: 0 0 44px;
}

.knowledge-base-page .tv-kb-search {
    min-height: 46px;
    padding: 0 14px;
    background: transparent;
    border-color: var(--tv-color-border);
    border-radius: 8px;
    transition: border-color 120ms ease, box-shadow 120ms ease;
}

.knowledge-base-page .tv-kb-search:focus-within {
    border-color: var(--tv-color-brand);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.14);
}

.knowledge-base-page .tv-kb-search__icon {
    position: static;
    flex: 0 0 auto;
    margin-right: 10px;
    transform: none;
}

.knowledge-base-page .tv-kb-search__input {
    min-width: 0;
    height: 44px;
    padding: 0;
    border: 0;
    border-radius: 0;
    font-size: 15px;
}

.knowledge-base-page .tv-kb-search__input::-webkit-search-cancel-button {
    display: none;
}

.knowledge-base-page .tv-kb-search__clear {
    flex: 0 0 32px;
    width: 32px;
    height: 32px;
    align-items: center;
    justify-content: center;
    margin-right: -8px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--tv-color-text-secondary);
    cursor: pointer;
}

.knowledge-base-page .tv-kb-search__clear:hover {
    background: var(--tv-color-card-hover);
    color: var(--tv-color-text);
}

.knowledge-base-page :is(a, button):focus-visible {
    outline: 2px solid var(--tv-color-brand);
    outline-offset: 2px;
}

.knowledge-base-page .tv-kb-search__input:focus-visible {
    outline: none;
}

.knowledge-base-page .tv-section-title {
    margin-bottom: 12px;
    font-size: 17px;
    font-weight: 600;
}

.knowledge-base-page .tv-kb-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 32px;
    margin-top: 0;
    padding-bottom: 72px;
    border-top: 1px solid var(--tv-color-border);
}

.knowledge-base-page .tv-kb-card {
    min-height: 76px;
    padding: 14px 4px;
    background: transparent;
    border: 0;
    border-bottom: 1px solid var(--tv-color-border);
    border-radius: 0;
    transition: background-color 120ms ease;
}

.knowledge-base-page .tv-kb-card:hover {
    background: var(--tv-color-card-hover);
    border-color: var(--tv-color-border);
    box-shadow: none;
    transform: none;
}

.knowledge-base-page .tv-kb-card__content {
    gap: 2px;
}

.knowledge-base-page .tv-kb-card__title {
    margin: 0;
    font-size: 15px;
    line-height: 1.35;
    font-weight: 600;
}

.knowledge-base-page .tv-kb-card__count {
    font-size: 13px;
    font-variant-numeric: tabular-nums;
}

.knowledge-base-page .tv-kb-card__icon {
    flex: 0 0 24px;
    margin-left: 12px;
    transition: color 120ms ease;
}

.knowledge-base-page .tv-kb-card__icon svg {
    width: 20px;
    height: 20px;
}

.knowledge-base-page .tv-kb-search-results {
    background: var(--tv-color-bg);
    border-radius: 8px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.14);
}

.knowledge-base-page .tv-kb-search-result {
    transition: background-color 120ms ease;
}

.knowledge-base-page .tv-kb-search-result__title mark {
    background: rgba(0, 113, 227, 0.16);
    color: var(--tv-color-text);
}

@media (max-width: 768px) {
    .knowledge-base-page .tv-container {
        padding: 0 16px;
    }

    .knowledge-base-page .tv-page-title {
        font-size: 28px;
    }

    .knowledge-base-page .tv-kb-grid {
        grid-template-columns: 1fr;
    }

    .knowledge-base-page .tv-kb-card {
        min-height: 68px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .knowledge-base-page *,
    .knowledge-base-page *::before,
    .knowledge-base-page *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}

/* Knowledge category and article pages: shared Apple Flat treatment. */
.knowledge-detail-page {
    --tv-color-bg: #ffffff;
    --tv-color-text: #1d1d1f;
    --tv-color-text-secondary: #6e6e73;
    --tv-color-brand: #0071e3;
    --tv-color-brand-hover: #0077ed;
    --tv-color-border: #d2d2d7;
    --tv-color-card-bg: transparent;
    --tv-color-card-hover: #f5f5f7;
    --bg-color: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --surface-color: #ffffff;
    --border-color: #d2d2d7;
    background: #ffffff;
    letter-spacing: 0;
}

:root:not([data-theme="light"]) .knowledge-detail-page {
    --tv-color-bg: #000000;
    --tv-color-text: #f5f5f7;
    --tv-color-text-secondary: #a1a1a6;
    --tv-color-border: #38383a;
    --tv-color-card-bg: transparent;
    --tv-color-card-hover: #1c1c1e;
    --bg-color: #000000;
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --surface-color: #000000;
    --border-color: #38383a;
    background: #000000;
}

.knowledge-detail-page .landing-header {
    position: sticky;
    background: var(--tv-color-bg);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    transition: none;
}

.knowledge-detail-page .brand-logo {
    background: transparent;
}

.knowledge-detail-page .dropdown-panel,
.knowledge-detail-page .tv-breadcrumb-dropdown {
    background: var(--tv-color-bg);
    border-color: var(--tv-color-border);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    animation: none;
}

.knowledge-detail-page .dropdown-title {
    letter-spacing: 0;
    text-transform: none;
}

.knowledge-detail-page .tv-main {
    padding-top: 0;
}

.knowledge-detail-page .tv-container {
    max-width: 1040px;
    padding: 0 24px;
}

.knowledge-detail-page .tv-breadcrumbs {
    padding: 28px 0 12px;
    font-size: 13px;
}

.knowledge-detail-page .tv-article {
    max-width: 100%;
    padding: 0 0 72px;
}

.knowledge-article-page .tv-article {
    max-width: 760px;
}

.knowledge-detail-page .tv-page-title,
.knowledge-detail-page .tv-article__content > h1:first-child {
    margin: 0 0 28px;
    font-size: 32px;
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: 0;
}

.knowledge-detail-page .tv-article__content h2 {
    margin: 44px 0 12px;
    font-size: 20px;
    line-height: 1.3;
    font-weight: 600;
    letter-spacing: 0;
}

.knowledge-detail-page .tv-article__content h3 {
    font-size: 17px;
    letter-spacing: 0;
}

.knowledge-detail-page .nuvexlens-intro {
    margin: 0 0 36px;
    padding: 12px 0 12px 16px;
    background: transparent;
    border: 0;
    border-left: 2px solid var(--tv-color-brand);
    border-radius: 0;
    color: var(--tv-color-text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

.knowledge-detail-page .nuvexlens-intro strong {
    color: var(--tv-color-text);
}

.knowledge-detail-page .tv-subcat-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 32px;
    margin-top: 0;
    border-top: 1px solid var(--tv-color-border);
}

.knowledge-detail-page .tv-article__content a.tv-subcat-card,
.knowledge-detail-page .tv-subcat-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    min-height: 78px;
    padding: 14px 4px;
    background: transparent;
    border: 0;
    border-bottom: 1px solid var(--tv-color-border);
    border-radius: 0;
    box-shadow: none;
    transform: none;
    transition: background-color 120ms ease;
    color: var(--tv-color-text);
    text-decoration: none;
    box-sizing: border-box;
}

.knowledge-detail-page .tv-article__content a.tv-subcat-card:hover,
.knowledge-detail-page .tv-subcat-card:hover {
    background: var(--tv-color-card-hover);
    border-color: var(--tv-color-border);
    box-shadow: none;
    transform: none;
}

.knowledge-detail-page .tv-subcat-title {
    display: block;
    margin: 0;
    font-size: 15px;
    line-height: 1.4;
    font-weight: 600;
}

.knowledge-detail-page .tv-subcat-count {
    display: block;
    margin-top: 3px;
    font-size: 13px;
    font-variant-numeric: tabular-nums;
}

.knowledge-detail-page .tv-article-list {
    margin: 0;
    padding: 0;
    list-style: none;
    border-top: 1px solid var(--tv-color-border);
}

.knowledge-detail-page .tv-article-item {
    margin: 0;
    padding: 0;
    list-style: none;
}

.knowledge-detail-page .tv-article__content a.tv-article-link,
.knowledge-detail-page .tv-article-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    width: 100%;
    padding: 14px 4px;
    background: transparent;
    border: 0;
    border-bottom: 1px solid var(--tv-color-border);
    border-radius: 0;
    box-shadow: none;
    transform: none;
    transition: background-color 120ms ease;
    font-size: 15px;
    line-height: 1.45;
    font-weight: 600;
    text-decoration: none;
    box-sizing: border-box;
}

.knowledge-detail-page .tv-article-link::after {
    content: "\2192";
    flex: 0 0 auto;
    color: var(--tv-color-text-secondary);
    font-size: 17px;
    font-weight: 400;
}

.knowledge-detail-page .tv-article__content a.tv-article-link:hover,
.knowledge-detail-page .tv-article-link:hover {
    background: var(--tv-color-card-hover);
    border-color: var(--tv-color-border);
    box-shadow: none;
    transform: none;
}

.knowledge-category-page .tv-article__content > .tv-subcat-count {
    margin: 10px 4px 0;
    font-size: 13px;
    line-height: 1.4;
}

.knowledge-article-page .signal-figure {
    margin: 24px 0 32px;
}

.knowledge-article-page .signal-figure img {
    display: block;
    width: 100%;
    height: auto;
    border: 1px solid var(--tv-color-border);
    border-radius: 6px;
}

.knowledge-article-page .signal-figure figcaption {
    margin-top: 9px;
    color: var(--tv-color-text-secondary);
    font-size: 13px;
    line-height: 1.55;
}

.knowledge-detail-page .nuvexlens-home-btn {
    padding: 7px 12px;
    background: transparent;
    border: 1px solid var(--tv-color-border);
    border-radius: 6px;
    color: var(--tv-color-text) !important;
    font-size: 13px;
    font-weight: 500;
}

.knowledge-detail-page .nuvexlens-home-btn:hover {
    background: var(--tv-color-card-hover);
}

.knowledge-detail-page :is(a, button):focus-visible {
    outline: 2px solid var(--tv-color-brand);
    outline-offset: 2px;
}

.knowledge-detail-page .container-WDZ0PRNh:focus-within {
    border-color: var(--tv-color-brand);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.14);
}

.knowledge-detail-page .input-RUSovanF:focus-visible {
    outline: none;
}

@media (max-width: 768px) {
    .knowledge-detail-page .tv-container {
        padding: 0 16px;
    }

    .knowledge-detail-page .tv-page-title,
    .knowledge-detail-page .tv-article__content > h1:first-child {
        font-size: 28px;
    }

    .knowledge-detail-page .tv-subcat-grid {
        grid-template-columns: 1fr;
    }

    .knowledge-detail-page .tv-subcat-card {
        min-height: 68px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .knowledge-detail-page *,
    .knowledge-detail-page *::before,
    .knowledge-detail-page *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}