/**
 * 科技门户主题响应式样式。
 *
 * 按平板与移动端分段处理导航折叠、栅格收缩和页脚堆叠。
 */

/* 平板设备 */
@media (max-width: 1200px) {
    .portal-feature-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .portal-highlight-grid,
    .portal-news-grid,
    .portal-footer__guarantees,
    .portal-footer__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .portal-hero__inner,
    .portal-layout {
        grid-template-columns: minmax(0, 1fr);
    }

    .portal-layout {
        gap: 24px;
    }
}

/* 中小屏设备 */
@media (max-width: 960px) {
    .portal-header__inner {
        min-height: 78px;
        gap: 14px;
    }

    .portal-header__nav-shell {
        position: static;
        flex: 1;
        min-width: 0;
        margin-left: 0;
        padding: 0;
        border: 0;
        background: transparent;
        box-shadow: none;
    }

    .portal-header__nav-shell::before {
        display: none;
    }

    .portal-header.is-nav-open {
        background: rgba(255, 255, 255, 0.98);
        border-bottom-color: rgba(231, 237, 245, 0.86);
        box-shadow: 0 20px 48px rgba(15, 23, 42, 0.14);
    }

    .portal-header.is-nav-open .portal-brand__title,
    .portal-header.is-nav-open .portal-nav-toggle {
        color: var(--tp-dark);
    }

    .portal-header.is-nav-open .portal-brand__subtitle {
        color: rgba(102, 112, 133, 0.9);
    }

    .portal-header.is-nav-open .portal-brand__subtitle::before {
        background: color-mix(in srgb, var(--tp-primary) 58%, #d7e5f7);
    }

    .portal-header.is-nav-open .portal-nav-toggle {
        border-color: rgba(148, 163, 184, 0.24);
        background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(244, 248, 255, 0.82));
        box-shadow: 0 16px 28px rgba(15, 23, 42, 0.08);
    }

    .portal-nav-toggle {
        display: inline-flex;
        flex-shrink: 0;
        margin-left: 0;
    }

    .portal-nav {
        position: absolute;
        top: calc(100% + 12px);
        left: 16px;
        right: 16px;
        padding: 18px;
        border: 1px solid rgba(255, 255, 255, 0.76);
        background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(245, 249, 255, 0.95));
        border-radius: 24px;
        box-shadow: 0 30px 60px rgba(15, 23, 42, 0.16);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-12px) scale(0.98);
        transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
    }

    .portal-header--overlay .portal-nav,
    .portal-header.is-scrolled .portal-nav {
        border-color: rgba(255, 255, 255, 0.14);
        background: linear-gradient(180deg, rgba(15, 23, 42, 0.98), rgba(9, 14, 28, 0.95));
        box-shadow: 0 30px 60px rgba(2, 6, 23, 0.38);
    }

    /* 移动端菜单展开后应始终保持浅色面板，避免滚动态把按钮与菜单重新刷成深色方案。 */
    .portal-header.is-nav-open .portal-nav {
        border-color: rgba(255, 255, 255, 0.76);
        background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(245, 249, 255, 0.95));
        box-shadow: 0 30px 60px rgba(15, 23, 42, 0.16);
    }

    .portal-nav.is-open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0) scale(1);
    }

    .portal-nav__list {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .portal-nav__item {
        width: 100%;
        padding-right: 0;
    }

    .portal-nav__item.has-children {
        display: flex;
        flex-wrap: wrap;
        align-items: flex-start;
        gap: 10px;
    }

    .portal-nav__link {
        width: 100%;
        justify-content: space-between;
        min-height: 50px;
        padding: 0 18px;
        border-radius: 16px;
        background: rgba(255, 255, 255, 0.62);
        box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.76);
    }

    .portal-nav__item.has-children > .portal-nav__link {
        flex: 1 1 0;
        width: auto;
    }

    .portal-nav__link--parent::after {
        display: none;
    }

    .portal-nav__toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        flex: 0 0 50px;
        width: 50px;
        min-width: 50px;
        min-height: 50px;
        padding: 0;
        border: 0;
        border-radius: 16px;
        background: rgba(255, 255, 255, 0.62);
        box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.76);
        color: color-mix(in srgb, var(--tp-dark) 82%, #617088);
        cursor: pointer;
        transition: background var(--tp-transition), box-shadow var(--tp-transition), color var(--tp-transition), transform var(--tp-transition);
    }

    .portal-nav__toggle-icon {
        width: 8px;
        height: 8px;
        border-right: 1.5px solid currentColor;
        border-bottom: 1.5px solid currentColor;
        transform: rotate(45deg) translateY(-1px);
        transition: transform var(--tp-transition), opacity var(--tp-transition);
    }

    .portal-header--overlay .portal-nav__link,
    .portal-header.is-scrolled .portal-nav__link,
    .portal-header--overlay .portal-nav__toggle,
    .portal-header.is-scrolled .portal-nav__toggle {
        background: rgba(255, 255, 255, 0.06);
        box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
    }

    .portal-header.is-nav-open .portal-nav__link,
    .portal-header.is-nav-open .portal-nav__toggle {
        color: color-mix(in srgb, var(--tp-dark) 82%, #617088);
        background: rgba(255, 255, 255, 0.62);
        box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.76);
    }

    .portal-header.is-nav-open .portal-nav__item:hover > .portal-nav__link,
    .portal-header.is-nav-open .portal-nav__item:focus-within > .portal-nav__link,
    .portal-header.is-nav-open .portal-nav__toggle:hover,
    .portal-header.is-nav-open .portal-nav__toggle:focus-visible {
        color: var(--tp-dark);
        background: rgba(255, 255, 255, 0.88);
        box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.82), 0 10px 24px rgba(15, 23, 42, 0.08);
    }

    .portal-header.is-nav-open .portal-nav__item.is-active > .portal-nav__link {
        color: var(--tp-primary);
        background: transparent;
        box-shadow: none;
    }

    .portal-nav__submenu {
        position: static;
        min-width: 0;
        width: 100%;
        margin-top: 0;
        margin-left: 0;
        padding: 0;
        border: 0;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        visibility: hidden;
        transform: none;
        transition: max-height 0.24s ease, opacity 0.2s ease, margin-top 0.2s ease, padding-top 0.2s ease, visibility 0.2s ease;
    }

    .portal-nav__item.is-submenu-open > .portal-nav__submenu {
        margin-top: 10px;
        padding-top: 10px;
        max-height: 480px;
        opacity: 1;
        visibility: visible;
    }

    .portal-nav__item.is-submenu-open > .portal-nav__toggle .portal-nav__toggle-icon {
        transform: rotate(225deg) translateY(-1px);
    }

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

    .portal-nav__submenu-item + .portal-nav__submenu-item {
        margin-top: 6px;
    }

    .portal-nav__submenu-link {
        min-height: 40px;
        padding: 0 14px 0 38px;
        color: var(--tp-text-soft);
    }

    .portal-header--overlay .portal-nav__submenu-link,
    .portal-header.is-scrolled .portal-nav__submenu-link {
        color: rgba(255, 255, 255, 0.76);
    }

    .portal-header.is-nav-open .portal-nav__submenu-link {
        color: var(--tp-text-soft);
    }

    .portal-nav__submenu-item:hover .portal-nav__submenu-link,
    .portal-nav__submenu-item.is-active .portal-nav__submenu-link,
    .portal-nav__submenu-link:focus-visible {
        color: var(--tp-primary);
        background: transparent;
        transform: translateX(0);
    }

    .portal-header--overlay .portal-nav__submenu-item:hover .portal-nav__submenu-link,
    .portal-header--overlay .portal-nav__submenu-item.is-active .portal-nav__submenu-link,
    .portal-header--overlay .portal-nav__submenu-link:focus-visible,
    .portal-header.is-scrolled .portal-nav__submenu-item:hover .portal-nav__submenu-link,
    .portal-header.is-scrolled .portal-nav__submenu-item.is-active .portal-nav__submenu-link,
    .portal-header.is-scrolled .portal-nav__submenu-link:focus-visible {
        color: #ffffff;
    }

    .portal-header.is-nav-open .portal-nav__submenu-item:hover .portal-nav__submenu-link,
    .portal-header.is-nav-open .portal-nav__submenu-item.is-active .portal-nav__submenu-link,
    .portal-header.is-nav-open .portal-nav__submenu-link:focus-visible {
        color: var(--tp-primary);
    }

    .portal-nav__item::after {
        display: none;
    }

    .portal-header__actions {
        display: none;
    }

    .portal-comment-form__grid,
    .portal-neighbor,
    .portal-footer__bottom-inner {
        grid-template-columns: minmax(0, 1fr);
    }
}

/* 手机设备 */
@media (max-width: 768px) {
    .portal-container,
    .portal-body--inner .portal-container {
        width: min(100% - 32px, 100%);
    }

    .portal-hero {
        padding: 132px 0 84px;
    }

    .portal-section,
    .portal-banner {
        padding-top: 52px;
        padding-bottom: 52px;
    }

    .portal-section--features,
    .portal-section--highlights,
    .portal-section--news {
        padding-top: 32px;
        padding-bottom: 32px;
    }

    .portal-feature-grid,
    .portal-highlight-grid,
    .portal-news-grid,
    .portal-footer__guarantees,
    .portal-footer__grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .portal-section-title--split {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .portal-section--features .portal-feature-grid,
    .portal-section--highlights .portal-highlight-grid,
    .portal-section--news .portal-news-grid {
        gap: 16px;
    }

    .portal-hero__copy h1 {
        font-size: 36px;
    }

    .portal-hero__copy p {
        font-size: 16px;
    }

    .portal-highlight-card__body,
    .portal-news-card,
    .portal-stream-card,
    .portal-article,
    .portal-page-content,
    .portal-widget,
    .portal-empty-card {
        padding: 22px;
    }

    .portal-feature-card {
        padding: 20px 18px;
    }

    .portal-highlight-card__cover {
        aspect-ratio: 16 / 9.5;
    }

    .portal-highlight-card__body {
        gap: 12px;
        padding: 18px;
    }

    .portal-news-card {
        gap: 12px;
        padding: 16px 0 0;
    }

    .portal-brand {
        min-width: 0;
        max-width: calc(100% - 84px);
        padding-right: 0;
    }

    .portal-brand__title {
        font-size: 20px;
    }

    .portal-brand__subtitle::before {
        width: 18px;
    }

    .portal-article__header h1,
    .portal-banner h1,
    .portal-section-title h2 {
        font-size: 28px;
    }

    .portal-comment {
        grid-template-columns: minmax(0, 1fr);
    }

    .portal-comment--child {
        margin-left: 0;
    }

    .portal-section-title__eyebrow--feature,
    .portal-section-title__eyebrow--highlight,
    .portal-section-title__eyebrow--news {
        padding: 0;
    }
}

/* 小屏手机 */
@media (max-width: 480px) {
    .portal-hero__actions,
    .portal-header__inner {
        gap: 10px;
    }

    .portal-button,
    .portal-backtop,
    .portal-search__button {
        width: 100%;
    }

    .portal-hero__copy h1 {
        font-size: 30px;
    }

    .portal-body--home .portal-backtop {
        right: 16px;
        right: max(16px, env(safe-area-inset-right));
        bottom: 16px;
        bottom: max(16px, env(safe-area-inset-bottom));
        width: 48px;
        min-width: 48px;
        height: 48px;
        min-height: 48px;
        border-radius: 14px;
    }

    .portal-body--home .portal-backtop::before {
        top: 13px;
        width: 10px;
        height: 10px;
    }

    .portal-body--home .portal-backtop::after {
        top: 23px;
        height: 11px;
    }
}

/* ============================================================================
   UI 增强相关响应式补充
   ============================================================================ */

/* 平板端侧栏卡片调整 */
@media (max-width: 1200px) {
    .portal-sidebar-card {
        padding: 20px;
    }
}

/* 移动端侧栏组件优化 */
@media (max-width: 768px) {
    .portal-sidebar {
        gap: 16px;
    }

    .portal-sidebar-card {
        padding: 18px;
        border-radius: 12px;
    }

    .portal-sidebar-card__title {
        margin-bottom: 16px;
        padding-bottom: 12px;
        font-size: 15px;
    }

    .portal-sidebar-list li {
        padding: 10px 0;
    }

    .portal-sidebar-search {
        flex-direction: column;
    }

    .portal-sidebar-search button {
        width: 100%;
        padding: 12px;
    }

    /* 文章详情页调整 */
    .portal-article-header {
        margin-bottom: 28px;
        padding-bottom: 20px;
    }

    .portal-article-content {
        font-size: 15px;
    }

    .portal-article-content h2 {
        font-size: 20px;
        margin-top: 32px;
    }

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

    .portal-article-content pre {
        margin: 16px -18px;
        padding: 16px;
        border-radius: 0;
    }

    .portal-article-content blockquote {
        margin: 16px 0;
        padding: 12px 16px;
    }

    /* 评论区调整 */
    .portal-comments-section {
        margin-top: 32px;
    }

    .portal-comment-form__body textarea {
        min-height: 100px;
    }
}

/* 小屏手机进一步优化 */
@media (max-width: 480px) {
    .portal-sidebar-card {
        padding: 16px;
    }

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

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

    .portal-article-nav__item {
        padding: 14px 16px;
    }

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

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

    .portal-article-nav__title {
        font-size: 14px;
    }

}