/* ========================================
   学术交流平台 - 前台首页样式
   设计风格：典雅质朴
   主题色：#E6D9B8
   ======================================== */

:root {
    --color-primary: #E6D9B8;
    --color-primary-light: #F5EFE0;
    --color-primary-dark: #C4A76C;
    --color-dark: #3D3427;
    --color-text: #4A4035;
    --color-text-light: #7A6F62;
    --color-brown: #5B4A3F;
    --color-brown-medium: #8B7355;
    --color-white: #FFFFFF;
    --color-border: #D4C5A9;
    --color-shadow: rgba(61, 52, 39, 0.08);
    --color-accent-red: #B85C38;
}

* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    font-family: "PingFang SC", "Microsoft Yahei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-primary-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-brown);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover, a:focus {
    color: var(--color-primary-dark);
    text-decoration: none;
}

/* 模块一：首页 - 导航栏 ===== */
.navbar-default {
    background-color: rgba(61, 52, 39, 0.95);
    border-color: transparent;
    border-radius: 0;
    margin-bottom: 0;
    min-height: 60px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.navbar-default .navbar-brand {
    color: var(--color-primary);
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 2px;
    padding: 0 15px;
    height: 60px;
    line-height: 60px;
}

.navbar-default .navbar-brand:hover {
    color: var(--color-white);
}

.navbar-brand .navbar-logo {
    display: inline-block;
    height: 36px;
    width: auto;
    max-width: 200px;
    object-fit: contain;
    vertical-align: middle;
}

.navbar-default .navbar-nav > li > a {
    color: var(--color-primary);
    font-size: 15px;
    padding: 20px 18px;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

.navbar-default .navbar-nav > li > a:hover,
.navbar-default .navbar-nav > li > a:focus,
.navbar-default .navbar-nav > li.active > a {
    color: var(--color-white);
    background-color: rgba(230, 217, 184, 0.15);
}

.navbar-default .navbar-nav > li.active > a {
    border-bottom: 2px solid var(--color-primary);
}

.navbar-default .navbar-toggle {
    border-color: var(--color-primary);
    margin: 13px 15px;
}

.navbar-default .navbar-toggle .icon-bar {
    background-color: var(--color-primary);
}

.navbar-default .navbar-toggle:hover,
.navbar-default .navbar-toggle:focus {
    background-color: rgba(230, 217, 184, 0.15);
}

.navbar-default .navbar-collapse {
    border-color: rgba(230, 217, 184, 0.2);
}

/* 模块一：首页 - 轮播图 ===== */
.banner-carousel {
    margin-top: 60px;
}

.banner-item {
    position: relative;
    min-height: 520px;
    overflow: hidden;
}

.banner-item > img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(61, 52, 39, 0.85) 0%,
        rgba(91, 74, 63, 0.7) 40%,
        rgba(139, 115, 85, 0.4) 100%
    );
}

.banner-content {
    position: relative;
    z-index: 2;
    padding: 100px 0 80px;
    max-width: 600px;
}

.banner-label {
    display: inline-block;
    font-size: 13px;
    letter-spacing: 3px;
    color: var(--color-primary-dark);
    background: rgba(230, 217, 184, 0.15);
    border: 1px solid rgba(230, 217, 184, 0.3);
    padding: 4px 18px;
    border-radius: 2px;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.banner-content h1 {
    font-size: 44px;
    font-weight: 700;
    letter-spacing: 4px;
    margin: 0 0 20px;
    color: #FFFFFF;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.banner-desc {
    font-size: 15px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.8);
    margin: 0 0 35px;
}

.banner-btn {
    display: inline-block;
    padding: 12px 36px;
    background: var(--color-primary);
    color: var(--color-dark);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 2px;
    border-radius: 2px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.banner-btn:hover {
    background: var(--color-white);
    color: var(--color-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.banner-btn i {
    margin-left: 6px;
    transition: transform 0.3s ease;
}

.banner-btn:hover i {
    transform: translateX(4px);
}

.banner-carousel .carousel-control {
    width: 60px;
    height: 60px;
    top: 50%;
    bottom: auto;
    margin-top: -30px;
    background: rgba(61, 52, 39, 0.4);
    opacity: 0;
    transition: all 0.4s ease;
    border-radius: 2px;
}

.banner-carousel:hover .carousel-control {
    opacity: 1;
}

.banner-carousel .carousel-control:hover {
    background: rgba(61, 52, 39, 0.7);
}

.banner-carousel .carousel-control .glyphicon {
    font-size: 20px;
    color: var(--color-primary);
}

.banner-carousel .carousel-indicators {
    bottom: 30px;
}

.banner-carousel .carousel-indicators li {
    width: 40px;
    height: 3px;
    border: none;
    border-radius: 0;
    background-color: rgba(255, 255, 255, 0.3);
    margin: 0 4px;
    transition: all 0.4s ease;
}

.banner-carousel .carousel-indicators .active {
    width: 60px;
    background-color: var(--color-primary);
}

/* 模块一：首页 - 快速入口 ===== */
.quick-section {
    background: var(--color-white);
    padding: 0;
    position: relative;
    z-index: 2;
    margin-top: -40px;
}

.quick-section .container {
    position: relative;
    z-index: 2;
}

.quick-section .row {
    background: var(--color-white);
    border-radius: 6px;
    box-shadow: 0 10px 40px rgba(61, 52, 39, 0.12);
    overflow: hidden;
}

.quick-card {
    display: block;
    text-align: center;
    padding: 50px 20px 45px;
    background: var(--color-white);
    border-right: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

.quick-section .row > div:last-child .quick-card {
    border-right: none;
}

.quick-card:hover {
    background: var(--color-primary-light);
}

.quick-card:hover .quick-icon {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(196, 167, 108, 0.3);
}

.quick-icon {
    width: 60px;
    height: 60px;
    line-height: 60px;
    border-radius: 50%;
    margin: 0 auto 16px;
    transition: all 0.3s ease;
}

.quick-icon--search {
    background: linear-gradient(135deg, #8B7355, #C4A76C);
}
.quick-icon--calendar {
    background: linear-gradient(135deg, #B85C38, #E6D9B8);
}
.quick-icon--upload {
    background: linear-gradient(135deg, #5B4A3F, #8B7355);
}
.quick-icon--chat {
    background: linear-gradient(135deg, #3D3427, #5B4A3F);
}

.quick-icon i {
    font-size: 24px;
    color: #FFFFFF;
}

.quick-card h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-dark);
    margin: 0 0 4px;
    letter-spacing: 1px;
}

.quick-card p {
    font-size: 12px;
    color: var(--color-text-light);
    margin: 0;
}

/* ===== 通用板块标题 ===== */
.section {
    padding: 70px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-title {
    font-size: 28px;
    font-weight: 600;
    color: var(--color-dark);
    letter-spacing: 3px;
    margin: 0 0 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.title-decorate {
    display: inline-block;
    width: 30px;
    height: 2px;
    background: var(--color-primary-dark);
    vertical-align: middle;
}

.title-decorate:first-child {
    background: linear-gradient(90deg, transparent, var(--color-primary-dark));
}

.title-decorate:last-child {
    background: linear-gradient(90deg, var(--color-primary-dark), transparent);
}

.section-divider {
    width: 40px;
    height: 3px;
    background: var(--color-accent-red);
    margin: 0 auto 15px;
    border-radius: 2px;
}

.section-subtitle {
    font-size: 14px;
    color: var(--color-text-light);
    letter-spacing: 1px;
    margin: 0;
}

/* 模块一：首页 - 热门推荐 ===== */
.hot-section {
    background-color: var(--color-primary-light);
}

.hot-section .row {
    display: flex;
    flex-wrap: wrap;
}

.hot-section .row > [class*="col-"] {
    display: flex;
}

.hot-card {
    background: var(--color-white);
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
    margin-bottom: 25px;
    display: flex;
    flex-direction: column;
    width: 100%;
}

.hot-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(61, 52, 39, 0.12);
    border-color: var(--color-primary-dark);
}

.hot-card-img {
    position: relative;
    height: 160px;
    flex-shrink: 0;
    overflow: hidden;
}

.hot-card-img > img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.hot-card:hover .hot-card-img > img {
    transform: scale(1.08);
}

.hot-card-img--event {
    position: relative;
}

.hot-card-img::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(transparent, rgba(61, 52, 39, 0.4));
    pointer-events: none;
}

.hot-card-rank {
    position: absolute;
    top: 12px;
    left: 12px;
    width: 28px;
    height: 28px;
    line-height: 28px;
    text-align: center;
    background: var(--color-accent-red);
    color: #FFFFFF;
    font-size: 13px;
    font-weight: 700;
    border-radius: 2px;
    z-index: 2;
}

.hot-card-rank--event {
    background: var(--color-primary-dark);
    color: var(--color-dark);
    width: auto;
    padding: 0 10px;
    font-size: 11px;
    letter-spacing: 1px;
}

.hot-card-body {
    padding: 18px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.hot-tag {
    display: inline-block;
    font-size: 11px;
    padding: 2px 10px;
    border-radius: 2px;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 10px;
    width: fit-content;
}

.hot-tag--paper {
    background-color: var(--color-primary);
    color: var(--color-dark);
}

.hot-tag--recipe {
    background-color: #5B8C5A;
    color: #FFFFFF;
}

.hot-tag--folk {
    background-color: #C4A76C;
    color: var(--color-dark);
}

.hot-tag--patent {
    background-color: #8B5C9A;
    color: #FFFFFF;
}

.hot-tag--event {
    background-color: var(--color-accent-red);
    color: #FFFFFF;
}

.hot-card-body h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-dark);
    line-height: 1.5;
    margin: 0 0 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.hot-meta {
    font-size: 12px;
    color: var(--color-text-light);
    margin: 0;
    margin-top: auto;
    display: flex;
    gap: 16px;
}

.hot-meta span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* 模块一：首页 - 推荐新闻 ===== */
.news-section {
    background-color: var(--color-white);
}

.news-main-card {
    display: block;
    background: var(--color-primary-light);
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
    height: 100%;
}

.news-main-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(61, 52, 39, 0.12);
}

.news-main-img {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.news-main-img > img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.news-main-card:hover .news-main-img > img {
    transform: scale(1.05);
}

.news-main-img::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40%;
    background: linear-gradient(transparent, rgba(61, 52, 39, 0.3));
}

.news-main-body {
    padding: 24px;
}

.news-tag {
    display: inline-block;
    font-size: 12px;
    padding: 2px 12px;
    background-color: var(--color-accent-red);
    color: #FFFFFF;
    border-radius: 2px;
    font-weight: 600;
    margin-bottom: 12px;
}

.news-main-body h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-dark);
    margin: 0 0 12px;
    line-height: 1.4;
}

.news-main-body p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.7;
    margin: 0 0 18px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.news-date {
    font-size: 13px;
    color: var(--color-text-light);
}

.news-date i {
    margin-right: 4px;
}

.news-read-more {
    font-size: 13px;
    color: var(--color-primary-dark);
    font-weight: 600;
}

.news-read-more i {
    margin-left: 4px;
    transition: transform 0.3s ease;
}

.news-main-card:hover .news-read-more i {
    transform: translateX(4px);
}

.news-section .row {
    display: flex;
    align-items: stretch;
}

.news-section .row > [class*="col-"] {
    display: flex;
    flex-direction: column;
}

.news-list {
    background: var(--color-primary-light);
    border-radius: 6px;
    border: 1px solid var(--color-border);
    overflow: hidden;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.news-item {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

.news-item:last-child {
    border-bottom: none;
}

.news-item:hover {
    background-color: var(--color-primary);
    padding-left: 25px;
}

.news-tag-sm {
    display: inline-block;
    font-size: 11px;
    padding: 1px 8px;
    background-color: var(--color-primary);
    color: var(--color-dark);
    border-radius: 2px;
    font-weight: 600;
    white-space: nowrap;
    margin-right: 10px;
    flex-shrink: 0;
}

.news-item-title {
    flex: 1;
    font-size: 14px;
    color: var(--color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.news-date-sm {
    font-size: 12px;
    color: var(--color-text-light);
    margin-left: 12px;
    flex-shrink: 0;
}

.news-more-btn {
    display: block;
    text-align: center;
    padding: 14px;
    color: var(--color-primary-dark);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1px;
    border: 1px solid var(--color-border);
    border-top: none;
    border-radius: 0 0 6px 6px;
    transition: all 0.3s ease;
    margin-top: -1px;
}

.news-more-btn:hover {
    background: var(--color-primary);
    color: var(--color-dark);
}

.news-more-btn i {
    margin-left: 4px;
}

/* 模块一：首页 - 页脚 ===== */
.site-footer {
    background-color: var(--color-dark);
    color: var(--color-primary);
    padding: 50px 0 0;
}

.footer-brand {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--color-primary);
    margin-bottom: 15px;
}

.footer-desc {
    font-size: 14px;
    color: rgba(230, 217, 184, 0.6);
    line-height: 1.7;
    max-width: 350px;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 10px;
}

.footer-social a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(230, 217, 184, 0.1);
    color: var(--color-primary);
    font-size: 16px;
    transition: all 0.3s ease;
}

.footer-social a:hover {
    background: var(--color-primary);
    color: var(--color-dark);
    transform: translateY(-2px);
}

.site-footer h5 {
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 1px;
    margin: 0 0 18px;
    color: var(--color-primary);
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: rgba(230, 217, 184, 0.6);
    font-size: 14px;
    transition: all 0.3s ease;
    display: inline-block;
}

.footer-links a:hover {
    color: var(--color-primary);
    transform: translateX(4px);
}

.footer-bottom {
    border-top: 1px solid rgba(230, 217, 184, 0.1);
    margin-top: 35px;
    padding: 20px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(230, 217, 184, 0.4);
    margin: 0;
}

.footer-bottom a {
    color: rgba(230, 217, 184, 0.4);
}

.footer-bottom a:hover {
    color: var(--color-primary);
}

/* ===== 查看更多链接 ===== */
.more-link {
    display: inline-block;
    padding: 10px 30px;
    border: 2px solid var(--color-primary-dark);
    color: var(--color-primary-dark);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 1px;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.more-link:hover {
    background: var(--color-primary-dark);
    color: #FFFFFF;
}

.more-link i {
    margin-left: 6px;
    transition: transform 0.3s ease;
}

.more-link:hover i {
    transform: translateX(4px);
}

/* ===== 页脚联系方式 ===== */
.footer-contact li {
    display: flex;
    align-items: center;
    gap: 8px;
    color: rgba(230, 217, 184, 0.6);
    font-size: 13px;
}

.footer-contact li i {
    color: var(--color-primary-dark);
    font-size: 14px;
    width: 16px;
    text-align: center;
}

/* ===== 页脚移动端 ===== */
.site-footer .row > [class*="col-"] {
    margin-bottom: 30px;
}

.site-footer .row > [class*="col-"]:last-child {
    margin-bottom: 0;
}

@media (max-width: 991px) {
    .site-footer {
        padding: 40px 0 0;
    }

    .site-footer .row > [class*="col-"] {
        margin-bottom: 28px;
    }

    .site-footer .row > [class*="col-"]:last-child {
        margin-bottom: 0;
    }

    .footer-desc {
        max-width: 100%;
    }

    .footer-links {
        display: flex;
        flex-wrap: wrap;
        gap: 0;
    }

    .footer-links li {
        width: 50%;
        margin-bottom: 8px;
    }
}

@media (max-width: 767px) {
    .site-footer {
        padding: 30px 0 0;
    }

    .footer-brand {
        font-size: 18px;
        text-align: center;
        letter-spacing: 2px;
        margin-bottom: 12px;
    }

    .footer-desc {
        text-align: center;
        max-width: 100%;
        font-size: 13px;
        margin-bottom: 16px;
    }

    .footer-social {
        justify-content: center;
        margin-bottom: 8px;
    }

    .site-footer .row > [class*="col-"] {
        margin-bottom: 24px;
        padding-bottom: 24px;
        border-bottom: 1px solid rgba(230, 217, 184, 0.08);
    }

    .site-footer .row > [class*="col-"]:first-child {
        margin-bottom: 20px;
    }

    .site-footer .row > [class*="col-"]:last-child {
        margin-bottom: 0;
        padding-bottom: 0;
        border-bottom: none;
    }

    .site-footer h5 {
        font-size: 14px;
        margin-bottom: 14px;
        padding-bottom: 10px;
        border-bottom: 1px solid rgba(230, 217, 184, 0.1);
        letter-spacing: 2px;
    }

    .footer-links {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0;
    }

    .footer-links li {
        margin-bottom: 6px;
    }

    .footer-links a {
        font-size: 13px;
    }

    .footer-contact li {
        font-size: 12px;
        margin-bottom: 8px;
    }

    .footer-bottom {
        margin-top: 24px;
        padding: 16px 0;
    }

    .footer-bottom p {
        font-size: 12px;
        line-height: 1.8;
    }
}

@media (max-width: 480px) {
    .site-footer {
        padding: 24px 0 0;
    }

    .site-footer .row > [class*="col-"] {
        margin-bottom: 20px;
        padding-bottom: 20px;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .footer-links li {
        margin-bottom: 6px;
    }

    .footer-contact li {
        justify-content: center;
    }
}

/* ===== 响应式 ===== */
@media (max-width: 991px) {
    .banner-item {
        min-height: 400px;
    }
    .banner-content {
        padding: 80px 0 60px;
    }
    .banner-content h1 {
        font-size: 34px;
    }
    .news-main-card {
        margin-bottom: 25px;
    }
    .news-section .row {
        display: block;
    }
    .news-section .row > [class*="col-"] {
        display: block;
    }
    .news-list {
        flex: none;
        display: block;
    }
    .quick-card {
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }
    .quick-section .row > div:last-child .quick-card {
        border-bottom: none;
    }
}

@media (max-width: 767px) {
    .banner-item {
        min-height: 320px;
    }
    .banner-content {
        padding: 60px 0 40px;
    }
    .banner-content h1 {
        font-size: 26px;
        letter-spacing: 2px;
    }
    .banner-desc {
        font-size: 13px;
        display: none;
    }
    .banner-carousel .carousel-control {
        display: none;
    }
    .banner-label {
        font-size: 11px;
    }
    .quick-section {
        margin-top: -30px;
    }
    .quick-section .row {
        border-radius: 4px;
    }
    .section {
        padding: 50px 0;
    }
    .section-title {
        font-size: 22px;
    }
    .quick-card {
        padding: 24px 15px;
    }
    .quick-icon {
        width: 48px;
        height: 48px;
        line-height: 48px;
    }
    .quick-icon i {
        font-size: 20px;
    }
    .navbar-default .navbar-nav > li > a {
        padding: 10px 18px;
    }
    .navbar-default .navbar-nav > li.active > a {
        border-bottom: none;
    }
    .news-item {
        padding: 12px 15px;
    }
    .news-item-title {
        font-size: 13px;
    }
    .hot-card-img {
        height: 130px;
    }
}

/* ===== 空状态占位 ===== */
.empty-state {
    text-align: center;
    padding: 50px 20px;
    color: var(--color-text-light);
}

.empty-state i {
    font-size: 40px;
    color: var(--color-border);
    margin-bottom: 15px;
    display: block;
}

.empty-state p {
    font-size: 15px;
    margin: 0;
}

/* ===== 轮播图空状态 ===== */
.banner-placeholder {
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-primary-dark) 100%);
    padding: 100px 0;
    text-align: center;
}

.banner-placeholder i {
    font-size: 48px;
    color: rgba(230, 217, 184, 0.2);
    display: block;
    margin-bottom: 15px;
}

.banner-placeholder p {
    color: rgba(230, 217, 184, 0.3);
    font-size: 14px;
    letter-spacing: 1px;
    margin: 0;
}

/* ===== 图片占位 ===== */
.hot-card-img-placeholder,
.news-main-img-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-light);
    color: var(--color-text-light);
}

.hot-card-img-placeholder i {
    font-size: 28px;
}

.news-main-img-placeholder i {
    font-size: 36px;
}

/* ===== 置顶标签 ===== */
.news-tag-sm--top {
    background-color: var(--color-accent-red);
    color: #FFFFFF;
}

/* ===== 热门卡片链接 ===== */
.hot-card {
    display: block;
}

.hot-card:hover {
    text-decoration: none;
}