/* 模块二：论文模块 - 论文列表
   ========================================
   学术交流平台 - 论文模块样式
   设计风格：与首页一致的典雅质朴
   ======================================== */

/* ===== 主内容区 ===== */
.paper-main-section {
    padding: 40px 0 60px;
    background: var(--color-primary-light);
}

/* ===== 搜索区域 ===== */
.paper-search-box {
    background: var(--color-white);
    border-radius: 8px;
    box-shadow: 0 8px 30px rgba(61, 52, 39, 0.1);
    padding: 28px 30px 22px;
    margin-bottom: 20px;
    border: 1px solid rgba(212, 197, 169, 0.5);
}

.paper-search-bar {
    display: flex;
    gap: 0;
}

.search-input-wrap {
    flex: 1;
    position: relative;
}

.search-input-wrap i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-light);
    font-size: 16px;
}

.search-input {
    width: 100%;
    height: 48px;
    border: 2px solid var(--color-border);
    border-right: none;
    border-radius: 4px 0 0 4px;
    padding: 0 16px 0 44px;
    font-size: 14px;
    color: var(--color-text);
    background: var(--color-primary-light);
    transition: all 0.3s ease;
    outline: none;
}

.search-input:focus {
    border-color: var(--color-primary-dark);
    background: var(--color-white);
}

.search-input::placeholder {
    color: var(--color-text-light);
}

.search-btn {
    height: 48px;
    padding: 0 36px;
    background: linear-gradient(135deg, var(--color-brown), var(--color-brown-medium));
    color: var(--color-primary);
    border: none;
    border-radius: 0 4px 4px 0;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.search-btn:hover {
    background: linear-gradient(135deg, var(--color-dark), var(--color-brown));
    color: #FFFFFF;
    box-shadow: 0 4px 12px rgba(61, 52, 39, 0.25);
}

.search-tags {
    margin-top: 16px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.search-tags-label {
    font-size: 13px;
    color: var(--color-text-light);
    flex-shrink: 0;
}

.search-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1px;
    padding: 3px 12px;
    background: var(--color-primary-light);
    color: var(--color-brown-medium);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.search-tag:hover {
    background: var(--color-primary);
    color: var(--color-dark);
}

/* ===== 筛选栏 ===== */
.filter-bar {
    background: var(--color-white);
    border-radius: 8px;
    border: 1px solid rgba(212, 197, 169, 0.5);
    padding: 16px 24px;
    margin-bottom: 24px;
    box-shadow: 0 2px 8px rgba(61, 52, 39, 0.04);
}

/* ===== 论文列表 ===== */
.paper-list-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
    padding: 0 4px;
}

.paper-list-count {
    font-size: 14px;
    color: var(--color-text-light);
}

.paper-list-count strong {
    color: var(--color-accent-red);
    font-size: 16px;
}

/* ===== 论文卡片 ===== */
.paper-card {
    background: var(--color-white);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    margin-bottom: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.paper-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(61, 52, 39, 0.1);
    border-color: var(--color-primary-dark);
}

.paper-card-body {
    padding: 22px 24px;
}

.paper-card-top {
    display: flex;
    gap: 6px;
    margin-bottom: 10px;
}

.paper-tag {
    display: inline-block;
    font-size: 11px;
    padding: 2px 10px;
    border-radius: 2px;
    font-weight: 600;
    letter-spacing: 1px;
    color: #FFFFFF;
}

.paper-tag--clinical {
    background-color: var(--color-primary);
    color: #FFFFFF;
}

.paper-tag--pharmacology {
    background-color: #5B8C5A;
    color: #FFFFFF;
}

.paper-tag--herb {
    background-color: #8B7355;
    color: #FFFFFF;
}

.paper-tag--formula {
    background-color: #C4A76C;
    color: #FFFFFF;
}

.paper-tag--acupuncture {
    background-color: #7B6BA5;
    color: #FFFFFF;
}

.paper-tag--folk {
    background-color: #B85C38;
    color: #FFFFFF;
}

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

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

.paper-card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-dark);
    line-height: 1.6;
    margin: 0 0 10px;
    letter-spacing: 0.5px;
}

.paper-card-title a {
    color: inherit;
    transition: color 0.3s ease;
}

.paper-card-title a:hover {
    color: var(--color-primary-dark);
}

.paper-card-authors {
    font-size: 13px;
    color: var(--color-text-light);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.paper-card-authors i {
    margin-right: 4px;
    color: var(--color-primary-dark);
}

.paper-card-affiliation {
    font-size: 12px;
    color: var(--color-brown-medium);
    font-style: italic;
}

.paper-card-abstract {
    font-size: 13px;
    color: var(--color-text-light);
    line-height: 1.8;
    margin: 0 0 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.paper-card-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 14px;
}

.paper-card-keyword {
    display: inline-block;
    font-size: 11px;
    padding: 2px 8px;
    background: var(--color-primary-light);
    color: var(--color-brown-medium);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.paper-card-keyword:hover {
    background: var(--color-primary);
    color: var(--color-dark);
}

.paper-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 14px;
    border-top: 1px solid var(--color-border);
}

.paper-card-stats {
    display: flex;
    gap: 18px;
    font-size: 12px;
    color: var(--color-text-light);
}

.paper-card-stats span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.paper-card-stats i {
    font-size: 11px;
}

.paper-card-meta {
    display: flex;
    align-items: center;
    gap: 16px;
}

.paper-card-date {
    font-size: 12px;
    color: var(--color-text-light);
}

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

.paper-card-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary-dark);
    padding: 4px 14px;
    border: 1px solid var(--color-primary-dark);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.paper-card-btn:hover {
    background: var(--color-primary-dark);
    color: #FFFFFF;
}

/* ===== 右侧边栏 ===== */
.paper-sidebar-sticky {
    position: sticky;
    top: 80px;
}

.paper-sidebar-block {
    background: var(--color-white);
    border-radius: 8px;
    border: 1px solid rgba(212, 197, 169, 0.5);
    margin-bottom: 18px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(61, 52, 39, 0.04);
    transition: all 0.3s ease;
}

.paper-sidebar-block:hover {
    box-shadow: 0 4px 16px rgba(61, 52, 39, 0.08);
}

.paper-sidebar-block .sidebar-block-header {
    padding: 14px 18px;
    border-bottom: 1px solid var(--color-border);
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-white));
}

.paper-sidebar-block .sidebar-block-header h4 {
    margin: 0;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-dark);
    letter-spacing: 1px;
}

.paper-sidebar-block .sidebar-block-header h4 i {
    margin-right: 8px;
    color: var(--color-primary-dark);
}

.paper-sidebar-block .sidebar-stat-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.paper-sidebar-block .sidebar-stat-item {
    text-align: center;
    padding: 16px 10px;
    border-right: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.paper-sidebar-block .sidebar-stat-item:nth-child(2n) {
    border-right: none;
}

.paper-sidebar-block .sidebar-stat-item:nth-child(n+3) {
    border-bottom: none;
}

.paper-sidebar-block .sidebar-stat-num {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-dark);
    letter-spacing: 1px;
    margin-bottom: 2px;
}

.paper-sidebar-block .sidebar-stat-label {
    font-size: 11px;
    color: var(--color-text-light);
}

.paper-sidebar-block .sidebar-category-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.paper-sidebar-block .sidebar-category-list li a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 18px;
    color: var(--color-text);
    font-size: 13px;
    border-bottom: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

.paper-sidebar-block .sidebar-category-list li:last-child a {
    border-bottom: none;
}

.paper-sidebar-block .sidebar-category-list li a:hover {
    background: var(--color-primary-light);
    padding-left: 22px;
    color: var(--color-dark);
}

.paper-sidebar-block .sidebar-hot-list {
    padding: 6px 0;
}

.paper-sidebar-block .sidebar-hot-item {
    display: flex;
    align-items: flex-start;
    padding: 10px 18px;
    gap: 10px;
    transition: all 0.3s ease;
}

.paper-sidebar-block .sidebar-hot-item:hover {
    background: var(--color-primary-light);
}

.paper-sidebar-block .sidebar-hot-rank {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    font-size: 11px;
    font-weight: 700;
    background: var(--color-border);
    color: var(--color-text-light);
    border-radius: 2px;
    flex-shrink: 0;
    margin-top: 2px;
}

.paper-sidebar-block .sidebar-hot-rank.rank-1 {
    background: var(--color-accent-red);
    color: #FFFFFF;
}

.paper-sidebar-block .sidebar-hot-rank.rank-2 {
    background: var(--color-primary-dark);
    color: var(--color-dark);
}

.paper-sidebar-block .sidebar-hot-rank.rank-3 {
    background: var(--color-brown-medium);
    color: #FFFFFF;
}

.paper-sidebar-block .sidebar-hot-title {
    display: block;
    font-size: 12px;
    color: var(--color-text);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 2px;
}

.paper-sidebar-block .sidebar-hot-item:hover .sidebar-hot-title {
    color: var(--color-dark);
}

.paper-sidebar-block .sidebar-hot-meta {
    font-size: 11px;
    color: var(--color-text-light);
}

.paper-sidebar-block .sidebar-hot-meta i {
    margin-right: 3px;
}

/* ===== 响应式 ===== */
@media (max-width: 991px) {
    .paper-main-section {
        padding: 24px 0 40px;
    }

    .paper-search-box {
        padding: 20px 18px 16px;
    }

    .paper-card-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .paper-card-meta {
        width: 100%;
        justify-content: space-between;
    }

    .paper-card-affiliation {
        display: none;
    }

    .paper-sidebar-sticky {
        position: static;
    }
}

@media (max-width: 767px) {
    .paper-search-bar {
        flex-direction: column;
    }

    .search-input {
        border-right: 2px solid var(--color-border);
        border-radius: 4px;
    }

    .search-btn {
        border-radius: 4px;
        margin-top: 10px;
        height: 42px;
    }

    .filter-bar {
        padding: 12px 16px;
    }

    .filter-options {
        gap: 4px;
    }

    .paper-card-body {
        padding: 16px 18px;
    }

    .paper-card-title {
        font-size: 15px;
    }

    .paper-card-stats {
        gap: 12px;
    }
}