/**
 * 科技门户主题 - UI 增强样式层。
 *
 * 第二阶段 UI 提升专用，包含：
 * - 按钮与链接动效增强
 * - 卡片微交互优化
 * - 表单元素美化
 * - 文章详情页排版
 * - 侧栏组件统一
 * - 响应式体验优化
 */

/* ============================================================================
   2.1 按钮与链接动效增强
   ============================================================================ */

/* 按钮基础增强 - 添加 active 状态和更丰富的过渡效果 */
.portal-button {
    position: relative;
    overflow: hidden;
    font-weight: 500;
    letter-spacing: 0.02em;
    transition:
        transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1),
        background 0.25s ease,
        color 0.25s ease,
        border-color 0.25s ease,
        box-shadow 0.25s ease;
}

/* 悬浮时轻微上浮 + 阴影 */
.portal-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 123, 252, 0.2);
}

/* 点击时下压反馈 */
.portal-button:active {
    transform: translateY(0) scale(0.98);
    box-shadow: none;
    transition-duration: 0.1s;
}

/* 主色按钮悬浮加深 */
.portal-button--primary:hover {
    background: color-mix(in srgb, var(--tp-primary) 85%, #000);
    box-shadow: 0 6px 20px rgba(0, 123, 252, 0.35);
}

/* 幽灵按钮悬浮填充背景 */
.portal-button--ghost:hover {
    background: rgba(0, 123, 252, 0.08);
    border-color: var(--tp-primary);
    color: var(--tp-primary);
}

/* 轮廓按钮悬浮效果 */
.portal-button--outline:hover {
    border-color: var(--tp-primary);
    color: var(--tp-primary);
    background: rgba(0, 123, 252, 0.04);
}

/* Hero 区域按钮特殊处理 */
.portal-button--solid-light:hover {
    background: #f8fafc;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.15);
}

.portal-button--ghost-light:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.8);
}

/* 按钮涟漪效果（伪元素实现） */
.portal-button::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
    opacity: 0;
    transform: scale(0);
    transition: transform 0.4s ease, opacity 0.4s ease;
    pointer-events: none;
}

.portal-button:active::after {
    transform: scale(2.5);
    opacity: 1;
    transition-duration: 0s;
}

/* 行内链接增强 */
.portal-inline-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
    color: var(--tp-primary);
    transition: color 0.2s ease, gap 0.2s ease;
}

.portal-inline-link::after {
    content: '›';
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.portal-inline-link:hover {
    color: color-mix(in srgb, var(--tp-primary) 80%, #000);
}

.portal-inline-link:hover::after {
    transform: translateX(4px);
}

/* 下划线动画链接 */
.portal-link-underline {
    position: relative;
    display: inline-block;
}

.portal-link-underline::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--tp-primary);
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.portal-link-underline:hover::after {
    width: 100%;
}

/* 导航链接悬浮效果增强 */
.portal-nav__link {
    position: relative;
}

.portal-nav__link::before {
    display: none;
}

.portal-nav__item:hover > .portal-nav__link::before,
.portal-nav__item:focus-within > .portal-nav__link::before,
.portal-nav__item.is-active > .portal-nav__link::before {
    display: none;
}

/* 返回列表链接保持纯文字样式，避免文章页出现按钮化视觉。 */
.portal-back-link {
    gap: 8px;
    text-decoration: none;
    transition: color 0.2s ease;
}

.portal-back-link:hover {
    color: color-mix(in srgb, var(--tp-primary) 80%, #000);
}

.portal-back-link:focus-visible {
    outline: 2px solid var(--tp-primary);
    outline-offset: 3px;
    border-radius: 4px;
}

.portal-back-link__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    transition: transform 0.2s ease;
}

.portal-back-link:hover .portal-back-link__icon {
    transform: translateX(-2px);
}

.portal-banner--inner-clean h1,
.portal-section-title--plain h2 {
    margin-top: 0;
}

/* 首页节段标签 - 简约科技风格 */
.portal-section-title__eyebrow--feature,
.portal-section-title__eyebrow--highlight,
.portal-section-title__eyebrow--news {
    gap: 8px;
    padding: 0;
    border-radius: 0;
    border: 0;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0.06em;
    background: transparent;
    box-shadow: none;
    transition: color 0.25s ease;
}

.portal-section-title__eyebrow--feature::before,
.portal-section-title__eyebrow--highlight::before,
.portal-section-title__eyebrow--news::before {
    display: none;
}

/* 首页模块 - 深色调 */
.portal-section-title__eyebrow--feature {
    color: #334155;
}

.portal-section-title__eyebrow--feature:hover {
    color: #0f172a;
}

/* 内容精选 - 橙色调 */
.portal-section-title__eyebrow--highlight {
    color: #9a3412;
}

.portal-section-title__eyebrow--highlight:hover {
    color: #7c2d12;
}

/* 最新资讯 - 蓝色调 */
.portal-section-title__eyebrow--news {
    color: #0c4a6e;
}

.portal-section-title__eyebrow--news:hover {
    color: #0f4c81;
}

/* ============================================================================
   2.2 卡片微交互优化
   ============================================================================ */

/* 特性卡片悬浮效果 */
.portal-feature-card {
    position: relative;
    transition:
        transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
        box-shadow 0.3s ease,
        border-color 0.3s ease;
}

.portal-feature-card::before {
    display: none;
}

.portal-feature-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 28px rgba(15, 23, 42, 0.08);
}

/* 高亮卡片图片缩放效果 */
.portal-highlight-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.portal-highlight-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.08);
}

.portal-highlight-card__cover {
    overflow: hidden;
}

.portal-highlight-card__cover img {
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.portal-highlight-card:hover .portal-highlight-card__cover img {
    transform: scale(1.03);
}

/* 新闻卡片悬浮边框高亮 */
.portal-news-card {
    position: relative;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.portal-news-card::after {
    display: none;
}

.portal-news-card:hover {
    transform: none;
    box-shadow: none;
}

/* 文章流卡片悬浮效果 */
.portal-stream-card {
    position: relative;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.portal-stream-card:hover {
    transform: translateX(4px);
    border-left-color: var(--tp-primary);
}

.portal-stream-card h2 a {
    transition: color 0.2s ease;
}

.portal-stream-card:hover h2 a {
    color: var(--tp-primary);
}

/* 侧栏热门文章卡片 */
.portal-sidebar .portal-mini-card,
.portal-aside-block li {
    transition: background 0.2s ease, transform 0.2s ease;
}

.portal-sidebar .portal-mini-card:hover,
.portal-aside-block li:hover {
    background: rgba(0, 123, 252, 0.04);
    transform: translateX(4px);
}

/* ============================================================================
   2.3 表单元素美化
   ============================================================================ */

/* 输入框基础样式 */
.portal-input,
.portal-textarea,
input[type="text"],
input[type="email"],
input[type="url"],
input[type="password"],
input[type="search"],
textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    line-height: 1.5;
    color: var(--tp-text);
    background: var(--tp-surface);
    border: 1px solid var(--tp-border);
    border-radius: var(--tp-radius-sm, 6px);
    outline: none;
    transition:
        border-color 0.2s ease,
        box-shadow 0.2s ease,
        background 0.2s ease;
}

.portal-input:hover,
.portal-textarea:hover,
input[type="text"]:hover,
input[type="email"]:hover,
input[type="url"]:hover,
textarea:hover {
    border-color: color-mix(in srgb, var(--tp-border) 70%, var(--tp-primary));
}

.portal-input:focus,
.portal-textarea:focus,
input[type="text"]:focus,
input[type="email"]:focus,
input[type="url"]:focus,
input[type="password"]:focus,
input[type="search"]:focus,
textarea:focus {
    border-color: var(--tp-primary);
    box-shadow: 0 0 0 3px rgba(0, 123, 252, 0.12);
    background: #fff;
}

/* 输入框占位符样式 */
::placeholder {
    color: var(--tp-text-soft, #94a3b8);
    opacity: 0.7;
}

/* 文本域特殊处理 */
.portal-textarea,
textarea {
    min-height: 120px;
    resize: vertical;
}

/* 表单组布局 */
.portal-form-group {
    margin-bottom: 20px;
}

.portal-form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--tp-text);
}

/* 表单行内布局 */
.portal-form-row {
    display: flex;
    gap: 16px;
}

.portal-form-row > * {
    flex: 1;
}

/* 验证码输入组 */
.portal-captcha-group {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.portal-captcha-group input {
    flex: 1;
    max-width: 160px;
}

.portal-captcha-group img {
    height: 44px;
    border-radius: var(--tp-radius-sm, 6px);
    cursor: pointer;
    transition: opacity 0.2s ease;
}

.portal-captcha-group img:hover {
    opacity: 0.8;
}

/* 提交按钮样式 */
.portal-submit,
input[type="submit"],
button[type="submit"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-width: 120px;
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 500;
    color: #fff;
    background: var(--tp-primary);
    border: none;
    border-radius: var(--tp-radius-sm, 6px);
    cursor: pointer;
    transition:
        transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1),
        background 0.25s ease,
        box-shadow 0.25s ease;
}

.portal-submit:hover,
input[type="submit"]:hover,
button[type="submit"]:hover {
    background: color-mix(in srgb, var(--tp-primary) 85%, #000);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 123, 252, 0.3);
}

.portal-submit:active,
input[type="submit"]:active,
button[type="submit"]:active {
    transform: translateY(0) scale(0.98);
    box-shadow: none;
}

/* 表单错误状态 */
.portal-input--error,
.has-error input,
.has-error textarea {
    border-color: #ef4444;
}

.portal-input--error:focus,
.has-error input:focus,
.has-error textarea:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.12);
}

.portal-error-message {
    margin-top: 6px;
    font-size: 12px;
    color: #ef4444;
}

/* ============================================================================
   2.4 文章详情页排版优化
   ============================================================================ */

/* 文章头部区域 */
.portal-article-header {
    margin-bottom: 40px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--tp-border);
}

.portal-article-header h1 {
    margin: 0 0 20px;
    font-size: clamp(24px, 5vw, 36px);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.02em;
    color: var(--tp-dark);
}

/* 文章元信息 */
.portal-article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px 24px;
    font-size: 14px;
    color: var(--tp-text-soft);
}

.portal-article-meta__item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.portal-article-meta__item svg,
.portal-article-meta__item i {
    width: 16px;
    height: 16px;
    opacity: 0.7;
}

.portal-article-meta a {
    color: var(--tp-primary);
    transition: color 0.2s ease;
}

.portal-article-meta a:hover {
    color: color-mix(in srgb, var(--tp-primary) 80%, #000);
}

/* 文章封面图 */
.portal-article-cover {
    margin: 0 0 32px;
    border-radius: var(--tp-radius-lg, 18px);
    overflow: hidden;
}

.portal-article-cover img {
    width: 100%;
    height: auto;
    display: block;
}

/* 文章内容区排版 */
.portal-article-content {
    font-size: 16px;
    line-height: 1.8;
    color: var(--tp-text);
}

.portal-article-content h2 {
    margin: 48px 0 20px;
    padding-bottom: 12px;
    font-size: 24px;
    font-weight: 600;
    border-bottom: 1px solid var(--tp-border);
}

.portal-article-content h3 {
    margin: 36px 0 16px;
    font-size: 20px;
    font-weight: 600;
}

.portal-article-content h4 {
    margin: 28px 0 12px;
    font-size: 18px;
    font-weight: 600;
}

.portal-article-content p {
    margin: 0 0 20px;
}

.portal-article-content ul,
.portal-article-content ol {
    margin: 0 0 20px;
    padding-left: 24px;
}

.portal-article-content li {
    margin-bottom: 8px;
}

.portal-article-content blockquote {
    margin: 24px 0;
    padding: 16px 24px;
    background: var(--tp-surface-soft, #f9fcff);
    border-left: 4px solid var(--tp-primary);
    border-radius: 0 var(--tp-radius-sm, 6px) var(--tp-radius-sm, 6px) 0;
    font-style: italic;
    color: var(--tp-text-soft);
}

.portal-article-content blockquote p:last-child {
    margin-bottom: 0;
}

.portal-article-content pre {
    margin: 24px 0;
    padding: 20px;
    background: #1e293b;
    border-radius: var(--tp-radius-md, 10px);
    overflow-x: auto;
}

.portal-article-content code {
    font-family: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    font-size: 14px;
}

.portal-article-content p code,
.portal-article-content li code {
    padding: 2px 6px;
    background: rgba(0, 123, 252, 0.08);
    border-radius: 4px;
    color: var(--tp-primary);
}

.portal-article-content pre code {
    padding: 0;
    background: transparent;
    color: #e2e8f0;
}

.portal-article-content img {
    margin: 24px 0;
    border-radius: var(--tp-radius-md, 10px);
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
}

.portal-article-content table {
    width: 100%;
    margin: 24px 0;
    border-collapse: collapse;
    font-size: 14px;
}

.portal-article-content th,
.portal-article-content td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--tp-border);
}

.portal-article-content th {
    font-weight: 600;
    background: var(--tp-surface-soft, #f9fcff);
}

.portal-article-content tr:hover td {
    background: rgba(0, 123, 252, 0.02);
}

/* 文章底部操作区 */
.portal-article-footer {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--tp-border);
}

.portal-article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}

.portal-article-tags a {
    display: inline-flex;
    padding: 6px 14px;
    font-size: 13px;
    color: var(--tp-text-soft);
    background: var(--tp-surface-soft, #f9fcff);
    border-radius: 999px;
    transition: background 0.2s ease, color 0.2s ease;
}

.portal-article-tags a:hover {
    background: rgba(0, 123, 252, 0.1);
    color: var(--tp-primary);
}

/* 文章导航(上一篇/下一篇) - 扁平链接样式 */
.portal-article-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0;
    margin-top: 32px;
    border: 1px solid var(--tp-border);
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
    overflow: hidden;
}

.portal-article-nav__item {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 8px;
    min-height: 86px;
    padding: 18px 22px;
    text-decoration: none;
    transition: background 0.25s ease, color 0.25s ease;
}

.portal-article-nav__item:first-child {
    border-right: 1px solid var(--tp-border);
}

.portal-article-nav__item:hover {
    background: rgba(0, 123, 252, 0.06);
}

.portal-article-nav__item--prev {
    align-items: flex-start;
    text-align: left;
}

.portal-article-nav__item--next {
    align-items: flex-end;
    text-align: right;
}

.portal-article-nav__heading {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
    min-width: 0;
}

.portal-article-nav__item--next .portal-article-nav__heading {
    justify-content: flex-end;
}

.portal-article-nav__arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: color-mix(in srgb, var(--tp-primary) 82%, #1e293b);
    font-size: 18px;
    transition: transform 0.25s ease, color 0.25s ease;
}

.portal-article-nav__item:hover .portal-article-nav__arrow {
    color: var(--tp-primary);
}

.portal-article-nav__item--prev:hover .portal-article-nav__arrow {
    transform: translateX(-3px);
}

.portal-article-nav__item--next:hover .portal-article-nav__arrow {
    transform: translateX(3px);
}

.portal-article-nav__label {
    margin-bottom: 0;
    font-size: 11px;
    font-weight: 700;
    color: var(--tp-text-soft);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    transition: color 0.25s ease;
}

.portal-article-nav__item:hover .portal-article-nav__label {
    color: var(--tp-primary);
}

.portal-article-nav__title {
    font-size: 15px;
    font-weight: 600;
    color: var(--tp-text);
    line-height: 1.4;
    width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: color 0.25s ease;
}

.portal-article-nav__item--next .portal-article-nav__title {
    text-align: right;
}

.portal-article-nav__item:hover .portal-article-nav__title {
    color: var(--tp-primary);
}

.portal-article-nav__item--empty {
    opacity: 0.72;
    cursor: not-allowed;
    background: rgba(148, 163, 184, 0.08);
}

.portal-article-nav__item--empty:hover {
    background: transparent;
}

.portal-article-nav__item--empty .portal-article-nav__title {
    color: var(--tp-text-soft);
}

.portal-article-nav__item--empty .portal-article-nav__label {
    color: var(--tp-text-soft);
}

.portal-article-nav__item--empty .portal-article-nav__arrow {
    color: var(--tp-text-soft);
}

.portal-article-nav__item--empty:hover .portal-article-nav__arrow {
    transform: none;
}

/* ============================================================================
   2.5 侧栏组件样式统一
   ============================================================================ */

/* 侧栏容器 */
.portal-sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* 侧栏卡片基础样式 */
.portal-sidebar-card {
    padding: 24px;
    background: var(--tp-surface);
    border: 1px solid var(--tp-border);
    border-radius: var(--tp-radius-lg, 18px);
    transition: box-shadow 0.3s ease;
}

.portal-sidebar-card:hover {
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

/* 侧栏卡片标题 */
.portal-sidebar-card__title {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0 0 20px;
    padding-bottom: 14px;
    font-size: 16px;
    font-weight: 600;
    color: var(--tp-dark);
    border-bottom: 1px solid var(--tp-border);
}

.portal-sidebar-card__title::before {
    content: '';
    width: 4px;
    height: 18px;
    background: var(--tp-primary);
    border-radius: 2px;
}

/* 侧栏列表样式 */
.portal-sidebar-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.portal-sidebar-list li {
    padding: 12px 0;
    border-bottom: 1px dashed var(--tp-border);
}

.portal-sidebar-list li:last-child {
    padding-bottom: 0;
    border-bottom: none;
}

.portal-sidebar-list a {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--tp-text);
    transition: color 0.2s ease, transform 0.2s ease;
}

.portal-sidebar-list a:hover {
    color: var(--tp-primary);
    transform: translateX(4px);
}

/* 带序号的列表 */
.portal-sidebar-list--numbered {
    counter-reset: sidebar-item;
}

.portal-sidebar-list--numbered li {
    counter-increment: sidebar-item;
}

.portal-sidebar-list--numbered a::before {
    content: counter(sidebar-item);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    font-size: 12px;
    font-weight: 600;
    color: var(--tp-text-soft);
    background: var(--tp-surface-soft, #f9fcff);
    border-radius: 6px;
    flex-shrink: 0;
    transition: background 0.2s ease, color 0.2s ease;
}

.portal-sidebar-list--numbered li:nth-child(-n+3) a::before {
    background: var(--tp-primary);
    color: #fff;
}

.portal-sidebar-list--numbered a:hover::before {
    background: var(--tp-primary);
    color: #fff;
}

/* 标签云样式 */
.portal-sidebar-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.portal-sidebar-tags a {
    display: inline-flex;
    padding: 6px 12px;
    font-size: 13px;
    color: var(--tp-text-soft);
    background: var(--tp-surface-soft, #f9fcff);
    border-radius: 999px;
    transition: all 0.2s ease;
}

.portal-sidebar-tags a:hover {
    background: rgba(0, 123, 252, 0.1);
    color: var(--tp-primary);
    transform: translateY(-2px);
}

/* 分类列表带计数 */
.portal-sidebar-categories a {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.portal-sidebar-categories .count {
    font-size: 12px;
    color: var(--tp-text-soft);
    background: var(--tp-surface-soft, #f9fcff);
    padding: 2px 8px;
    border-radius: 999px;
}

/* 搜索框侧栏样式 */
.portal-sidebar-search {
    display: flex;
    gap: 8px;
}

.portal-sidebar-search input {
    flex: 1;
}

.portal-sidebar-search button {
    padding: 0 16px;
    background: var(--tp-primary);
    color: #fff;
    border: none;
    border-radius: var(--tp-radius-sm, 6px);
    cursor: pointer;
    transition: background 0.2s ease;
}

.portal-sidebar-search button:hover {
    background: color-mix(in srgb, var(--tp-primary) 85%, #000);
}

/* ============================================================================
   2.6 响应式体验优化
   ============================================================================ */

/* 触控设备优化 - 增大点击区域 */
@media (hover: none) and (pointer: coarse) {
    .portal-button {
        min-height: 48px;
        padding: 0 24px;
    }

    .portal-nav__link {
        padding: 12px 16px;
    }

    .portal-sidebar-list a {
        padding: 14px 0;
    }

    .portal-inline-link {
        padding: 8px 0;
    }

    /* 移动端禁用悬浮上浮效果，避免触控后保持状态 */
    .portal-button:hover,
    .portal-feature-card:hover,
    .portal-highlight-card:hover,
    .portal-news-card:hover {
        transform: none;
    }
}

/* 平板端调整 */
@media (max-width: 960px) {
    .portal-article-nav {
        grid-template-columns: 1fr;
    }

    .portal-article-nav__item {
        min-height: 0;
        padding: 16px 18px;
    }

    .portal-article-nav__item:first-child {
        border-right: none;
        border-bottom: 1px solid var(--tp-border);
    }

    .portal-article-nav__item--next {
        align-items: flex-start;
        text-align: left;
    }

    .portal-article-nav__item--next .portal-article-nav__heading {
        justify-content: flex-start;
    }

    .portal-article-nav__item--next .portal-article-nav__title {
        text-align: left;
    }

    .portal-form-row {
        flex-direction: column;
    }
}

/* 移动端调整 */
@media (max-width: 768px) {
    /* 文章标题缩小 */
    .portal-article-header h1 {
        font-size: 22px;
    }

    /* 文章内容区调整 */
    .portal-article-content {
        font-size: 15px;
    }

    .portal-article-content h2 {
        font-size: 20px;
        margin: 36px 0 16px;
    }

    .portal-article-content h3 {
        font-size: 18px;
    }

    /* 侧栏卡片调整 */
    .portal-sidebar-card {
        padding: 20px;
    }

    /* 按钮组垂直排列 */
    .portal-hero__actions {
        flex-direction: column;
        width: 100%;
    }

    .portal-hero__actions .portal-button {
        width: 100%;
    }

    /* 评论表单调整 */
    .portal-captcha-group {
        flex-wrap: wrap;
    }

    .portal-captcha-group input {
        max-width: 100%;
    }
}

/* 小屏幕手机 */
@media (max-width: 480px) {
    .portal-article-meta {
        flex-direction: column;
        gap: 8px;
    }

    .portal-article-tags a {
        padding: 5px 12px;
        font-size: 12px;
    }

    .portal-sidebar-tags {
        gap: 6px;
    }

    .portal-sidebar-tags a {
        padding: 5px 10px;
        font-size: 12px;
    }
}

/* 减少动画偏好支持 */
@media (prefers-reduced-motion: reduce) {
    .portal-button,
    .portal-feature-card,
    .portal-highlight-card,
    .portal-news-card,
    .portal-stream-card,
    .portal-inline-link,
    .portal-nav__link::before,
    .portal-link-underline::after {
        transition: none;
    }

    .portal-button:hover,
    .portal-feature-card:hover,
    .portal-highlight-card:hover,
    .portal-news-card:hover {
        transform: none;
    }

    .portal-highlight-card:hover .portal-highlight-card__cover img {
        transform: none;
    }
}