:root {
    --primary-color: #4e73df;
    --secondary-color: #224abe;
    --success-color: #1cc88a;
    --info-color: #36b9cc;
    --warning-color: #f6c23e;
    --danger-color: #e74a3b;
    --dark-color: #5a5c69;
    --light-color: #f8f9fc;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
}

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

.nav-menu a {
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary-color);
}

.nav-buttons {
    display: flex;
    gap: 10px;
}

.btn {
    padding: 8px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-size: 14px;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(78, 115, 223, 0.4);
}

.btn-outline {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

/* 英雄区域 */
.hero {
    text-align: center;
    padding: 80px 20px;
    background: linear-gradient(135deg, rgba(78, 115, 223, 0.1), rgba(34, 74, 190, 0.1));
    border-radius: 20px;
    margin: 40px 0;
    backdrop-filter: blur(10px);
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 18px;
    color: #666;
    max-width: 600px;
    margin: 0 auto 30px;
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin: 50px 0;
}

.stat-card {
    background: white;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-10px);
}

.stat-card h3 {
    font-size: 36px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-card p {
    color: #666;
    font-size: 16px;
}

/* 特色功能 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin: 50px 0;
}

.feature-card {
    background: white;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 32px;
}

.feature-card h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* 投诉列表 */
.complaints-section {
    background: white;
    border-radius: 20px;
    padding: 30px;
    margin: 40px 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

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

.section-header h2 {
    color: var(--primary-color);
}

.search-box {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.search-box input,
.search-box select {
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
}

.search-box input {
    flex: 1;
    min-width: 200px;
}

.search-box button {
    padding: 10px 30px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s;
}

.search-box button:hover {
    background: var(--secondary-color);
}

.complaint-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #eee;
    transition: background 0.3s;
    flex-wrap: wrap;
    gap: 15px;
}

.complaint-item:hover {
    background: #f8f9fc;
}

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

.complaint-info h4 {
    margin-bottom: 10px;
    color: #333;
}

.complaint-meta {
    display: flex;
    gap: 20px;
    color: #666;
    font-size: 12px;
    flex-wrap: wrap;
}

.status {
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.status-pending {
    background: #fff3cd;
    color: #856404;
}

.status-investigating {
    background: #cce5ff;
    color: #004085;
}

.status-resolved {
    background: #d4edda;
    color: #155724;
}

/* 提交投诉表单 */
.form-container {
    max-width: 800px;
    margin: 40px auto;
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.form-title {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary-color);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(78, 115, 223, 0.1);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.file-upload {
    border: 2px dashed #ddd;
    padding: 30px;
    text-align: center;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.file-upload:hover {
    border-color: var(--primary-color);
    background: #f8f9fc;
}

.file-upload i {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.file-upload p {
    color: #666;
}

.file-upload small {
    display: block;
    margin-top: 10px;
    color: #999;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
}

/* 登录注册页面 */
.auth-container {
    min-height: calc(100vh - 200px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
}

.auth-box {
    background: white;
    border-radius: 20px;
    padding: 40px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.auth-header h2 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.auth-header p {
    color: #666;
}

.verification-group {
    display: flex;
    gap: 10px;
}

.verification-group input {
    flex: 1;
}

.verification-group button {
    padding: 0 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.3s;
}

.verification-group button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

/* 反馈页面 */
.feedback-section {
    background: white;
    border-radius: 20px;
    padding: 40px;
    margin: 40px 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.feedback-types {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.feedback-type-card {
    padding: 30px;
    background: #f8f9fc;
    border-radius: 15px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.feedback-type-card:hover,
.feedback-type-card.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    transform: translateY(-5px);
}

.feedback-type-card i {
    font-size: 36px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.feedback-type-card:hover i,
.feedback-type-card.active i {
    color: white;
}

.feedback-type-card h4 {
    margin-bottom: 10px;
}

.feedback-type-card p {
    font-size: 14px;
    opacity: 0.8;
}

/* 关于我们页面 */
.about-section {
    background: white;
    border-radius: 20px;
    padding: 40px;
    margin: 40px 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.about-header {
    text-align: center;
    margin-bottom: 40px;
}

.about-header h2 {
    font-size: 36px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.about-header p {
    color: #666;
    font-size: 18px;
    max-width: 600px;
    margin: 0 auto;
}

.stats-highlight {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin: 40px 0;
}

.stat-highlight {
    text-align: center;
    padding: 30px;
    background: linear-gradient(135deg, #f8f9fc, #ffffff);
    border-radius: 15px;
}

.stat-highlight h3 {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-highlight p {
    color: #666;
    font-size: 16px;
}

.contact-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 50px;
}

.contact-card {
    text-align: center;
    padding: 30px;
    background: #f8f9fc;
    border-radius: 15px;
    transition: transform 0.3s;
}

.contact-card:hover {
    transform: translateY(-10px);
}

.contact-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
}

.contact-card h4 {
    margin-bottom: 10px;
    color: #333;
}

.contact-card p {
    color: #666;
}

/* 页脚 */
.footer {
    background: white;
    padding: 60px 0 20px;
    margin-top: 80px;
    box-shadow: 0 -5px 20px rgba(0, 0, 0, 0.05);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    color: var(--primary-color);
    margin-bottom: 20px;
}

.footer-col ul {
    list-style: none;
}

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

.footer-col ul li a {
    color: #666;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-col ul li a:hover {
    color: var(--primary-color);
}

.subscribe-form {
    display: flex;
    gap: 10px;
}

.subscribe-form input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

.subscribe-form button {
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #eee;
    color: #999;
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .stats-grid,
    .features-grid,
    .contact-section,
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .form-container {
        padding: 20px;
    }
    
    .search-box {
        flex-direction: column;
    }
    
    .search-box input,
    .search-box select,
    .search-box button {
        width: 100%;
    }
    
    .verification-group {
        flex-direction: column;
    }
}

/* 后台管理样式 */
.admin-container {
    padding: 40px 20px;
}

.admin-header {
    background: white;
    padding: 30px;
    border-radius: 20px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.admin-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 30px 0;
}

.admin-stat-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 20px;
    border-radius: 15px;
}

.admin-stat-card h4 {
    font-size: 14px;
    opacity: 0.9;
    margin-bottom: 10px;
}

.admin-stat-card .number {
    font-size: 32px;
    font-weight: bold;
}

.admin-table {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    overflow-x: auto;
}

.admin-table table {
    width: 100%;
    border-collapse: collapse;
}

.admin-table th {
    text-align: left;
    padding: 15px 10px;
    color: var(--primary-color);
    border-bottom: 2px solid #eee;
}

.admin-table td {
    padding: 15px 10px;
    border-bottom: 1px solid #eee;
}

.admin-table tr:hover {
    background: #f8f9fc;
}

.admin-actions {
    display: flex;
    gap: 10px;
}

.admin-actions button {
    padding: 5px 10px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 12px;
}

.btn-edit {
    background: var(--primary-color);
    color: white;
}

.btn-delete {
    background: var(--danger-color);
    color: white;
}

.btn-view {
    background: var(--info-color);
    color: white;
}

/* 消息提示 */
.alert {
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeeba;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.close-btn {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: inherit;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}