/* 全局样式 - 极简黑白灰风格 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --black: #000000;
    --white: #ffffff;
    --gray-100: #f5f5f5;
    --gray-200: #eeeeee;
    --gray-300: #e0e0e0;
    --gray-400: #bdbdbd;
    --gray-500: #9e9e9e;
    --gray-600: #757575;
    --gray-700: #616161;
    --gray-800: #424242;
    --gray-900: #212121;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: var(--gray-900);
    background-color: var(--white);
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--white);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    max-width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--black);
    text-decoration: none;
    letter-spacing: 2px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--gray-600);
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--black);
}

/* 用户区域 */
.user-area {
    display: flex;
    align-items: center;
    gap: 15px;
}

.btn-auth {
    padding: 8px 18px;
    border: 1px solid var(--gray-300);
    background-color: var(--white);
    color: var(--gray-700);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 4px;
}

.btn-auth:hover {
    border-color: var(--black);
    color: var(--black);
}

.btn-auth.btn-primary {
    background-color: var(--black);
    color: var(--white);
    border-color: var(--black);
}

.btn-auth.btn-primary:hover {
    background-color: var(--gray-800);
}

.user-name {
    font-size: 0.9rem;
    color: var(--gray-600);
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
}

.modal-content {
    background-color: var(--white);
    padding: 45px;
    width: 100%;
    max-width: 400px;
    border-radius: 8px;
    position: relative;
    transform: translateY(-20px);
    transition: transform 0.3s ease;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.modal.show .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 18px;
    font-size: 1.6rem;
    color: var(--gray-400);
    cursor: pointer;
    transition: color 0.3s ease;
    background: none;
    border: none;
}

.modal-close:hover {
    color: var(--black);
}

#login-form h2,
#register-form h2 {
    font-size: 1.6rem;
    margin-bottom: 8px;
    color: var(--black);
}

.modal-subtitle {
    color: var(--gray-500);
    margin-bottom: 25px;
}

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

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--gray-800);
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--gray-300);
    border-radius: 4px;
    font-size: 0.9rem;
    color: var(--gray-800);
    background-color: var(--white);
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--black);
}

.btn-auth-full {
    width: 100%;
    padding: 12px;
    background-color: var(--black);
    color: var(--white);
    border: none;
    border-radius: 4px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-top: 8px;
}

.btn-auth-full:hover {
    background-color: var(--gray-800);
}

.modal-footer {
    text-align: center;
    margin-top: 20px;
    color: var(--gray-600);
    font-size: 0.85rem;
}

.modal-footer a {
    color: var(--black);
    text-decoration: none;
    font-weight: 500;
}

/* 主内容区 - 四列布局 */
.main-content {
    padding: 90px 20px 40px;
    min-height: calc(100vh - 100px);
}

.content-wrapper {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 1800px;
    margin: 0 auto;
}

.content-column {
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    overflow: hidden;
}

.column-header {
    background-color: var(--black);
    color: var(--white);
    padding: 20px;
    text-align: center;
}

.column-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 1px;
}

.column-body {
    padding: 20px;
    max-height: calc(100vh - 250px);
    overflow-y: auto;
}

/* 竖向卡片样式 */
.vertical-card {
    padding: 18px;
    border-bottom: 1px solid var(--gray-200);
    transition: all 0.3s ease;
    cursor: pointer;
}

.vertical-card:hover {
    background-color: var(--gray-100);
    padding-left: 25px;
}

.vertical-card:last-child {
    border-bottom: none;
}

.vertical-card .card-icon {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.vertical-card .card-number {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--gray-200);
    margin-bottom: 10px;
}

.vertical-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--black);
    margin-bottom: 8px;
}

.vertical-card p {
    font-size: 0.85rem;
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: 10px;
}

.card-tag {
    display: inline-block;
    padding: 2px 8px;
    background-color: var(--black);
    color: var(--white);
    font-size: 0.7rem;
    border-radius: 3px;
    margin-right: 5px;
}

/* 迷你资讯样式 */
.news-mini {
    padding: 12px 0;
    border-bottom: 1px solid var(--gray-200);
    cursor: pointer;
    transition: all 0.3s ease;
}

.news-mini:hover {
    padding-left: 10px;
    background-color: var(--gray-100);
}

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

.news-mini .news-date {
    font-size: 0.75rem;
    color: var(--gray-500);
    display: block;
    margin-bottom: 4px;
}

.news-mini h4 {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-800);
    line-height: 1.4;
}

/* 问题反馈样式 */
.feedback-section {
    border-top: 2px solid var(--gray-200);
    padding-top: 20px;
    margin-top: 10px;
}

.feedback-prompt {
    background-color: var(--gray-100);
    padding: 15px;
    margin-bottom: 15px;
    text-align: center;
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--gray-600);
}

.feedback-prompt a {
    color: var(--black);
    font-weight: 500;
}

.feedback-form-mini {
    margin-bottom: 20px;
}

.feedback-form-mini input,
.feedback-form-mini textarea,
.feedback-form-mini select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--gray-300);
    border-radius: 4px;
    font-size: 0.85rem;
    margin-bottom: 10px;
    background-color: var(--white);
}

.feedback-form-mini textarea {
    resize: none;
    min-height: 60px;
}

.btn-submit-mini {
    width: 100%;
    padding: 10px;
    background-color: var(--black);
    color: var(--white);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.3s ease;
}

.btn-submit-mini:hover {
    background-color: var(--gray-800);
}

/* 留言列表样式 */
.feedback-list-mini {
    max-height: 400px;
    overflow-y: auto;
}

.feedback-item-mini {
    padding: 12px;
    border: 1px solid var(--gray-200);
    margin-bottom: 10px;
    border-radius: 4px;
    background-color: var(--white);
    transition: all 0.3s ease;
}

.feedback-item-mini:hover {
    border-color: var(--gray-400);
}

.feedback-item-mini h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--black);
    margin-bottom: 6px;
}

.feedback-item-mini p {
    font-size: 0.8rem;
    color: var(--gray-600);
    margin-bottom: 8px;
    line-height: 1.5;
}

.feedback-meta-mini {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--gray-500);
}

.btn-vote-mini {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 5px 10px;
    background-color: var(--gray-100);
    border: 1px solid var(--gray-200);
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.75rem;
    transition: all 0.3s ease;
}

.btn-vote-mini:hover {
    background-color: var(--gray-200);
}

.btn-vote-mini.voted {
    background-color: var(--black);
    color: var(--white);
    border-color: var(--black);
}

/* 页脚 */
.footer {
    background-color: var(--gray-900);
    color: var(--gray-400);
    padding: 30px 0;
    text-align: center;
}

.footer p {
    margin-bottom: 5px;
    font-size: 0.85rem;
}

/* 响应式设计 */
@media (max-width: 1400px) {
    .content-wrapper {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 1024px) {
    .content-wrapper {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .content-wrapper {
        grid-template-columns: 1fr;
    }

    .navbar .container {
        flex-direction: column;
        gap: 12px;
    }

    .main-content {
        padding: 120px 15px 30px;
    }

    .column-body {
        max-height: none;
    }
}

/* 后台管理页面样式 */
.admin-container {
    display: flex;
    min-height: 100vh;
    padding-top: 70px;
}

.admin-sidebar {
    width: 250px;
    background-color: var(--gray-900);
    color: var(--white);
    padding: 30px 0;
    position: fixed;
    top: 70px;
    left: 0;
    bottom: 0;
    overflow-y: auto;
}

.admin-logo {
    padding: 0 25px 25px;
    border-bottom: 1px solid var(--gray-700);
    margin-bottom: 20px;
}

.admin-logo h2 {
    font-size: 1.3rem;
    letter-spacing: 2px;
}

.admin-menu {
    list-style: none;
}

.admin-menu li {
    margin-bottom: 5px;
}

.admin-menu a {
    display: block;
    padding: 12px 25px;
    color: var(--gray-400);
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.admin-menu a:hover,
.admin-menu a.active {
    background-color: var(--gray-800);
    color: var(--white);
    border-left-color: var(--white);
}

.admin-menu a.active {
    background-color: var(--gray-800);
}

.admin-main {
    flex: 1;
    margin-left: 250px;
    padding: 30px;
    background-color: var(--gray-100);
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.admin-header h1 {
    font-size: 1.8rem;
    color: var(--black);
}

.admin-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background-color: var(--white);
    padding: 25px;
    border-radius: 8px;
    border: 1px solid var(--gray-200);
}

.stat-card h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 5px;
}

.stat-card p {
    font-size: 0.9rem;
    color: var(--gray-500);
}

.admin-section {
    display: none;
}

.admin-section.active {
    display: block;
}

.admin-card {
    background-color: var(--white);
    border-radius: 8px;
    border: 1px solid var(--gray-200);
    overflow: hidden;
}

.admin-card-header {
    padding: 20px 25px;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.admin-card-header h2 {
    font-size: 1.2rem;
    color: var(--black);
}

.admin-card-body {
    padding: 25px;
}

/* 数据表格样式 */
.admin-table {
    width: 100%;
    border-collapse: collapse;
}

.admin-table th,
.admin-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.admin-table th {
    background-color: var(--gray-100);
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.85rem;
}

.admin-table td {
    font-size: 0.9rem;
    color: var(--gray-600);
}

.admin-table tr:hover td {
    background-color: var(--gray-100);
}

.badge {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 3px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-success {
    background-color: #d4edda;
    color: #155724;
}

.badge-warning {
    background-color: #fff3cd;
    color: #856404;
}

.badge-secondary {
    background-color: var(--gray-200);
    color: var(--gray-700);
}

/* 表单样式 */
.admin-form {
    max-width: 600px;
}

.admin-form .form-group {
    margin-bottom: 20px;
}

.admin-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--gray-700);
}

.admin-form input,
.admin-form textarea,
.admin-form select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--gray-300);
    border-radius: 4px;
    font-size: 0.95rem;
}

.admin-form textarea {
    min-height: 120px;
    resize: vertical;
}

.btn-primary {
    background-color: var(--black);
    color: var(--white);
    padding: 12px 25px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.95rem;
    transition: background-color 0.3s ease;
}

.btn-primary:hover {
    background-color: var(--gray-800);
}

.btn-secondary {
    background-color: var(--white);
    color: var(--gray-700);
    padding: 12px 25px;
    border: 1px solid var(--gray-300);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.95rem;
    margin-right: 10px;
}

.btn-secondary:hover {
    border-color: var(--black);
    color: var(--black);
}

.btn-danger {
    background-color: #dc3545;
    color: var(--white);
    padding: 8px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
}

.btn-danger:hover {
    background-color: #c82333;
}

/* 搜索和筛选 */
.admin-toolbar {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.admin-search {
    flex: 1;
    max-width: 300px;
}

.admin-search input {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--gray-300);
    border-radius: 4px;
}

.admin-filter select {
    padding: 10px 15px;
    border: 1px solid var(--gray-300);
    border-radius: 4px;
    background-color: var(--white);
}

/* 分页 */
.admin-pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 30px;
}

.admin-pagination button {
    padding: 8px 15px;
    border: 1px solid var(--gray-300);
    background-color: var(--white);
    cursor: pointer;
    transition: all 0.3s ease;
}

.admin-pagination button:hover,
.admin-pagination button.active {
    background-color: var(--black);
    color: var(--white);
    border-color: var(--black);
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--gray-500);
}

.empty-state h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

/* 响应式后台 */
@media (max-width: 1024px) {
    .admin-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .admin-sidebar {
        width: 100%;
        position: relative;
        top: 0;
    }
    
    .admin-main {
        margin-left: 0;
    }
    
    .admin-container {
        flex-direction: column;
    }
    
    .admin-stats {
        grid-template-columns: 1fr;
    }
    
    .admin-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
}