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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 600px;
    margin: 30px auto;
    padding: 0 15px;
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 25px;
    font-size: 24px;
}

.form-box {
    background: #fff;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}

.form-box h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #2c3e50;
    font-size: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 14px;
}

.form-group .required {
    color: #e74c3c;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #e1e5eb;
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

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

.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: all 0.2s;
}

.btn-primary {
    background-color: #3498db;
    color: #fff;
}

.btn-primary:hover {
    background-color: #2980b9;
    transform: translateY(-1px);
}

.btn-block {
    display: block;
    width: 100%;
}

.error {
    background-color: #fef2f2;
    color: #dc2626;
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 15px;
    border: 1px solid #fecaca;
}

.success {
    background-color: #f0fdf4;
    color: #16a34a;
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 15px;
    border: 1px solid #bbf7d0;
}

.success .pwd {
    font-size: 24px;
    color: #dc2626;
    font-weight: bold;
    letter-spacing: 2px;
}

.links {
    text-align: center;
    margin-top: 20px;
}

.links a {
    color: #3498db;
    text-decoration: none;
    font-size: 14px;
}

.links a:hover {
    text-decoration: underline;
}

.footer {
    text-align: center;
    margin-top: 25px;
    color: #7f8c8d;
    font-size: 13px;
}

/* 弹窗样式 */
.popup {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    backdrop-filter: blur(2px);
}

.popup-content {
    background-color: #fff;
    margin: 20% auto;
    padding: 0;
    border-radius: 12px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    animation: popupIn 0.3s ease-out;
}

@keyframes popupIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.popup-header {
    padding: 15px 20px;
    background-color: #3498db;
    color: #fff;
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.popup-header h3 {
    margin: 0;
    font-size: 18px;
}

.close {
    color: #fff;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
}

.popup-body {
    padding: 20px;
    font-size: 15px;
    line-height: 1.8;
}

/* 查询结果样式 */
.result-box {
    margin-top: 20px;
    border-top: 1px solid #eee;
    padding-top: 20px;
}

.result-box h3 {
    margin-bottom: 15px;
    color: #2c3e50;
    font-size: 18px;
}

.message-item {
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
}

.message-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 12px;
    color: #7f8c8d;
    flex-wrap: wrap;
    gap: 5px;
}

.message-content {
    margin-bottom: 10px;
}

.message-reply {
    background-color: #e8f4fc;
    padding: 10px;
    border-radius: 8px;
    margin-top: 10px;
}

.reply-time {
    display: block;
    text-align: right;
    font-size: 12px;
    color: #7f8c8d;
    margin-top: 5px;
}

.message-noreply {
    color: #7f8c8d;
    font-style: italic;
    padding: 10px 0;
}

.no-result {
    text-align: center;
    color: #7f8c8d;
    padding: 20px;
}

/* 后台样式 */
.admin-container {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: 220px;
    background-color: #2c3e50;
    color: #fff;
    flex-shrink: 0;
}

.logo {
    padding: 20px;
    text-align: center;
    font-size: 16px;
    font-weight: bold;
    border-bottom: 1px solid #34495e;
}

.menu {
    list-style: none;
}

.menu li {
    border-bottom: 1px solid #34495e;
}

.menu li a {
    display: block;
    padding: 15px 20px;
    color: #ecf0f1;
    text-decoration: none;
    font-size: 14px;
    transition: background-color 0.2s;
}

.menu li a:hover,
.menu li.active a {
    background-color: #3498db;
}

.admin-content {
    flex: 1;
    padding: 20px;
    overflow-x: auto;
}

.page-header {
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.page-header h1 {
    text-align: left;
    margin-bottom: 0;
    font-size: 22px;
}

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

.stat-card {
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
    text-align: center;
}

.stat-number {
    font-size: 32px;
    font-weight: bold;
    color: #3498db;
    margin-bottom: 10px;
}

.stat-label {
    color: #7f8c8d;
    font-size: 14px;
}

.welcome-box {
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}

.welcome-box h3 {
    margin-bottom: 15px;
    color: #2c3e50;
}

/* 登录页面 */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-box {
    width: 100%;
    max-width: 400px;
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}

.login-box h2 {
    text-align: center;
    margin-bottom: 25px;
    color: #2c3e50;
}

/* 后台表格样式 */
.filter-bar {
    background: #fff;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.filter-bar select, .filter-bar input {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
}

.message-table, .platform-table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}

.message-table th, .message-table td,
.platform-table th, .platform-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

.message-table th, .platform-table th {
    background-color: #f8f9fa;
    font-weight: 600;
    font-size: 14px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
    margin-right: 5px;
    border-radius: 6px;
}

.btn-danger {
    background-color: #e74c3c;
    color: #fff;
}

.btn-danger:hover {
    background-color: #c0392b;
}

.status-unreplied {
    color: #e74c3c;
    font-weight: bold;
}

.status-replied {
    color: #27ae60;
    font-weight: bold;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    backdrop-filter: blur(2px);
}

.modal-content {
    background-color: #fff;
    margin: 10% auto;
    padding: 20px;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    animation: popupIn 0.3s ease-out;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}

.close-modal {
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    color: #7f8c8d;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .admin-container {
        flex-direction: column;
    }
    
    .admin-sidebar {
        width: 100%;
    }
    
    .menu {
        display: flex;
        overflow-x: auto;
    }
    
    .menu li {
        border-bottom: none;
        border-right: 1px solid #34495e;
        white-space: nowrap;
    }
    
    .menu li a {
        padding: 12px 15px;
    }
    
    .admin-content {
        padding: 15px;
    }
    
    .popup-content {
        margin: 30% auto;
    }
    
    .message-table, .platform-table {
        font-size: 13px;
    }
    
    .message-table th, .message-table td,
    .platform-table th, .platform-table td {
        padding: 10px 8px;
    }
    
    .btn-sm {
        padding: 4px 8px;
        font-size: 11px;
        margin-bottom: 5px;
    }
}

@media (max-width: 480px) {
    .container {
        margin: 20px auto;
    }
    
    h1 {
        font-size: 20px;
    }
    
    .form-box {
        padding: 20px;
    }
    
    .form-box h2 {
        font-size: 18px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}