/* ========================================
   学术交流平台 - 用户中心样式
   设计风格：典雅质朴，与全站统一
   ======================================== */

/* 模块九：用户中心 - 整体布局 ===== */
.user-center-wrap {
    margin-top: 60px;
    min-height: calc(100vh - 60px);
    background: var(--color-primary-light);
}

.user-center-container {
    display: flex;
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 15px 60px;
    gap: 24px;
}

/* 模块九：用户中心 - 左侧边栏 ===== */
.user-sidebar {
    width: 220px;
    flex-shrink: 0;
}

.user-sidebar-card {
    background: var(--color-white);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.user-sidebar-header {
    padding: 28px 20px;
    text-align: center;
    background: linear-gradient(135deg, var(--color-dark), var(--color-brown));
    color: var(--color-primary);
}

.user-sidebar-avatar {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    border: 3px solid var(--color-primary);
    overflow: hidden;
    margin: 0 auto 10px;
}

.user-sidebar-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.user-sidebar-name {
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.user-sidebar-bio {
    font-size: 12px;
    color: rgba(230, 217, 184, 0.6);
    line-height: 1.4;
    margin: 0;
}

.user-sidebar-nav {
    list-style: none;
    padding: 8px 0;
    margin: 0;
}

.user-sidebar-nav li {
    margin: 0;
}

.user-sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    font-size: 14px;
    color: var(--color-text-light);
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.user-sidebar-nav a:hover {
    color: var(--color-dark);
    background: var(--color-primary-light);
    text-decoration: none;
}

.user-sidebar-nav a i {
    width: 18px;
    text-align: center;
    font-size: 14px;
}

.user-sidebar-nav li.active a {
    color: var(--color-dark);
    background: var(--color-primary);
    font-weight: 600;
    border-left-color: var(--color-primary-dark);
}

.user-sidebar-nav li.nav-divider {
    height: 1px;
    background: var(--color-border);
    margin: 8px 16px;
}

.user-sidebar-nav li.nav-logout a {
    color: var(--color-accent-red);
}

.user-sidebar-nav li.nav-logout a:hover {
    color: #a04030;
    background: rgba(184, 92, 56, 0.08);
}

/* 模块九：用户中心 - 右侧内容区 ===== */
.user-content {
    flex: 1;
    min-width: 0;
}

.user-content-card {
    background: var(--color-white);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.user-content-header {
    padding: 20px 28px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.user-content-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-dark);
    letter-spacing: 1px;
    margin: 0;
}

.user-content-body {
    padding: 28px;
}

/* 模块九：用户中心 - 个人中心首页 ===== */
.user-dashboard-welcome {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 28px;
}

.user-dashboard-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--color-primary);
    flex-shrink: 0;
}

.user-dashboard-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-dashboard-info h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-dark);
    letter-spacing: 1px;
    margin: 0 0 4px;
}

.user-dashboard-info p {
    font-size: 14px;
    color: var(--color-text-light);
    margin: 0;
}

.user-dashboard-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 28px;
}

.user-stat-item {
    text-align: center;
    padding: 20px 10px;
    background: var(--color-primary-light);
    border-radius: 6px;
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

.user-stat-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.user-stat-num {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 4px;
}

.user-stat-label {
    font-size: 13px;
    color: var(--color-text-light);
    letter-spacing: 0.5px;
}

.user-dashboard-shortcuts {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.user-shortcut-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 20px;
    background: var(--color-primary-light);
    border-radius: 6px;
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
    text-decoration: none;
}

.user-shortcut-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    border-color: var(--color-primary-dark);
    text-decoration: none;
}

.user-shortcut-icon {
    width: 44px;
    height: 44px;
    line-height: 44px;
    text-align: center;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    flex-shrink: 0;
}

.user-shortcut-icon i {
    font-size: 18px;
    color: var(--color-dark);
}

.user-shortcut-text h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-dark);
    letter-spacing: 0.5px;
    margin: 0 0 2px;
}

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

/* 模块九：用户中心 - 我的论文列表 ===== */
.user-paper-item {
    display: flex;
    align-items: center;
    padding: 18px 0;
    border-bottom: 1px solid var(--color-border);
    gap: 16px;
}

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

.user-paper-status {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    padding: 3px 12px;
    border-radius: 3px;
    letter-spacing: 0.5px;
    white-space: nowrap;
    min-width: 64px;
    text-align: center;
}

.user-paper-status--pending {
    background: #FFF3CD;
    color: #856404;
}

.user-paper-status--approved {
    background: #D4EDDA;
    color: #155724;
}

.user-paper-status--rejected {
    background: #F8D7DA;
    color: #721C24;
}

.user-paper-info {
    flex: 1;
    min-width: 0;
}

.user-paper-info h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-dark);
    margin: 0 0 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

.user-paper-meta span {
    margin-right: 16px;
}

.user-paper-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.user-paper-actions .btn-sm {
    font-size: 12px;
    padding: 4px 12px;
    border-radius: 3px;
}

/* 模块九：用户中心 - 收藏筛选 ===== */
.user-fav-filter {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}

.user-fav-filter-item {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-light);
    padding: 6px 16px;
    border-radius: 3px;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    text-decoration: none;
    cursor: pointer;
}

.user-fav-filter-item:hover {
    color: var(--color-dark);
    text-decoration: none;
}

.user-fav-filter-item.active {
    color: #fff;
    background: var(--color-dark);
}

/* 模块九：用户中心 - 我的收藏列表 ===== */
.user-fav-item {
    display: flex;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
    gap: 16px;
}

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

.user-fav-icon {
    width: 42px;
    height: 42px;
    line-height: 42px;
    text-align: center;
    border-radius: 50%;
    flex-shrink: 0;
    font-size: 16px;
}

.user-fav-icon--paper {
    background: var(--color-primary);
    color: var(--color-dark);
}

.user-fav-icon--activity {
    background: rgba(184, 92, 56, 0.12);
    color: var(--color-accent-red);
}

.user-fav-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    padding: 2px 10px;
    border-radius: 2px;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.user-fav-tag--paper, .user-fav-tag {
    background: var(--color-primary);
    color: var(--color-dark);
}

.user-fav-tag--activity {
    background: rgba(184, 92, 56, 0.12);
    color: var(--color-accent-red);
}

.user-fav-info {
    flex: 1;
    min-width: 0;
}

.user-fav-info h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-dark);
    margin: 0 0 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-fav-info h4 a {
    color: var(--color-dark);
    text-decoration: none;
    transition: color 0.3s ease;
}

.user-fav-info h4 a:hover {
    color: var(--color-primary-dark);
}

.user-fav-meta {
    font-size: 12px;
    color: var(--color-text-light);
}

.user-fav-meta span {
    margin-right: 16px;
}

.user-fav-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.user-fav-actions .btn-sm {
    font-size: 12px;
    padding: 4px 12px;
    border-radius: 3px;
}

.user-fav-remove {
    font-size: 13px;
    color: var(--color-text-light);
    cursor: pointer;
    padding: 6px 12px;
    border: 1px solid var(--color-border);
    border-radius: 3px;
    transition: all 0.3s ease;
    background: transparent;
    flex-shrink: 0;
}

.user-fav-remove:hover {
    color: var(--color-accent-red);
    border-color: var(--color-accent-red);
    background: rgba(184, 92, 56, 0.05);
}

/* 模块九：用户中心 - 下载记录 ===== */
.user-dl-table {
    width: 100%;
    border-collapse: collapse;
}

.user-dl-table th {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-brown);
    letter-spacing: 0.5px;
    padding: 12px 16px;
    text-align: left;
    background: var(--color-primary-light);
    border-bottom: 1px solid var(--color-border);
}

.user-dl-table td {
    font-size: 14px;
    color: var(--color-text);
    padding: 14px 16px;
    border-bottom: 1px solid var(--color-border);
}

.user-dl-table tr:last-child td {
    border-bottom: none;
}

.user-dl-table tr:hover td {
    background: var(--color-primary-light);
}

.user-dl-table td a {
    color: var(--color-dark);
    font-weight: 600;
    text-decoration: none;
    transition: color 0.3s ease;
}

.user-dl-table td a:hover {
    color: var(--color-primary-dark);
}

.user-dl-btn {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-dark);
    padding: 4px 14px;
    border: 1px solid var(--color-border);
    border-radius: 3px;
    letter-spacing: 0.5px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.user-dl-btn:hover {
    border-color: var(--color-primary-dark);
    background: var(--color-primary);
    color: var(--color-dark);
    text-decoration: none;
}

/* 模块九：用户中心 - 表单样式 ===== */
.user-form-group {
    margin-bottom: 20px;
}

.user-form-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-dark);
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.user-form-input {
    width: 100%;
    max-width: 420px;
    height: 40px;
    padding: 0 12px;
    font-size: 14px;
    color: var(--color-text);
    background: var(--color-primary-light);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    outline: none;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

.user-form-input:focus {
    border-color: var(--color-primary-dark);
}

.user-form-textarea {
    width: 100%;
    max-width: 420px;
    padding: 10px 12px;
    font-size: 14px;
    color: var(--color-text);
    background: var(--color-primary-light);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    outline: none;
    resize: vertical;
    min-height: 80px;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

.user-form-textarea:focus {
    border-color: var(--color-primary-dark);
}

.user-form-btn {
    display: inline-block;
    padding: 10px 28px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 1px;
    color: #FFFFFF;
    background: var(--color-dark);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.user-form-btn:hover {
    background: var(--color-primary-dark);
}

.user-form-btn--outline {
    background: transparent;
    color: var(--color-dark);
    border: 1px solid var(--color-border);
}

.user-form-btn--outline:hover {
    border-color: var(--color-dark);
    background: var(--color-primary-light);
}

/* 模块九：用户中心 - 登录/注册页 ===== */
.user-auth-page {
    margin-top: 60px;
    min-height: calc(100vh - 60px);
    background: var(--color-primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 15px;
}

.user-auth-card {
    width: 100%;
    max-width: 440px;
    background: var(--color-white);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.user-auth-header {
    padding: 32px 32px 0;
    text-align: center;
}

.user-auth-header h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-dark);
    letter-spacing: 2px;
    margin: 0 0 8px;
}

.user-auth-header p {
    font-size: 13px;
    color: var(--color-text-light);
    margin: 0;
}

.user-auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--color-border);
    margin: 24px 32px 0;
}

.user-auth-tab {
    flex: 1;
    text-align: center;
    padding: 12px 0;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-light);
    letter-spacing: 1px;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
    text-decoration: none;
}

.user-auth-tab:hover {
    color: var(--color-dark);
    text-decoration: none;
}

.user-auth-tab.active {
    color: var(--color-dark);
    border-bottom-color: var(--color-primary-dark);
}

.user-auth-body {
    padding: 28px 32px 32px;
}

.user-auth-body .form-group {
    margin-bottom: 18px;
}

.user-auth-body .form-group label {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-dark);
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.user-auth-body .form-control {
    height: 42px;
    border-radius: 4px;
    border: 1px solid var(--color-border);
    background: var(--color-primary-light);
    font-size: 14px;
    padding: 0 12px;
    transition: border-color 0.3s ease;
}

.user-auth-body .form-control:focus {
    border-color: var(--color-primary-dark);
    box-shadow: none;
}

.user-auth-btn {
    display: block;
    width: 100%;
    padding: 12px 0;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 2px;
    color: #FFFFFF;
    background: var(--color-dark);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.user-auth-btn:hover {
    background: var(--color-primary-dark);
}

.user-auth-link {
    display: block;
    text-align: center;
    padding: 12px;
    font-size: 14px;
    color: var(--color-text-light);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    margin-top: 12px;
    transition: all 0.3s ease;
    text-decoration: none;
}

.user-auth-link:hover {
    color: var(--color-dark);
    border-color: var(--color-primary-dark);
    text-decoration: none;
}

.user-auth-forgot {
    font-size: 13px;
    color: var(--color-primary-dark);
    cursor: pointer;
}

.user-auth-forgot:hover {
    color: var(--color-dark);
}

.user-auth-checkbox {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--color-text-light);
}

/* ===== 空状态 ===== */
.user-empty {
    text-align: center;
    padding: 60px 20px;
}

.user-empty i {
    font-size: 48px;
    color: var(--color-border);
    margin-bottom: 16px;
}

.user-empty p {
    font-size: 14px;
    color: var(--color-text-light);
    margin: 0;
}

/* ===== 移动端侧边栏 ===== */
.user-sidebar-toggle {
    display: none;
    position: fixed;
    right: 16px;
    bottom: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-dark);
    color: var(--color-primary);
    text-align: center;
    line-height: 48px;
    font-size: 20px;
    z-index: 999;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* ===== 响应式 ===== */
@media (max-width: 991px) {
    .user-center-container {
        flex-direction: column;
        padding: 20px 15px 40px;
    }

    .user-sidebar {
        width: 100%;
        display: none;
    }

    .user-sidebar.show {
        display: block;
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 1030;
        background: rgba(0, 0, 0, 0.5);
        padding: 20px;
        overflow-y: auto;
    }

    .user-sidebar.show .user-sidebar-card {
        max-width: 280px;
        margin: 0 auto;
    }

    .user-sidebar-toggle {
        display: block;
    }

    .user-dashboard-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .user-dashboard-shortcuts {
        grid-template-columns: 1fr;
    }

    .user-stat-num {
        font-size: 20px;
    }

    .user-content-body {
        padding: 20px;
    }

    .user-paper-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .user-paper-actions {
        align-self: flex-end;
    }

    .user-fav-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .user-fav-actions {
        align-self: flex-end;
    }

    .user-dl-table {
        font-size: 13px;
    }

    .user-dl-table th,
    .user-dl-table td {
        padding: 10px 8px;
    }
}

@media (max-width: 767px) {
    .user-dashboard-welcome {
        flex-direction: column;
        text-align: center;
    }

    .user-auth-card {
        max-width: 100%;
    }

    .user-auth-body {
        padding: 24px 20px 28px;
    }

    .user-auth-header {
        padding: 24px 20px 0;
    }

    .user-auth-tabs {
        margin: 20px 20px 0;
    }
}