:root {
    --primary-color: #1a73e8;
    --primary-variant: #1557b0;
    --secondary-color: #018786;
    --background: #ffffff;
    --surface: #ffffff;
    --error: #b00020;
    --on-primary: #ffffff;
    --on-secondary: #000000;
    --on-background: #000000;
    --on-surface: #000000;
    --on-error: #ffffff;
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--background);
    color: var(--on-background);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* 头部样式 */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 2rem;
    font-weight: 500;
    color: var(--on-background);
}

/* 导航链接 */
.nav-link {
    text-decoration: none;
    color: var(--primary-color);
    margin-left: 1rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-variant);
}

/* Material 按钮 */
.material-button {
    background-color: var(--primary-color);
    color: var(--on-primary);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.material-button:hover {
    background-color: var(--primary-variant);
}

.material-button.secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.material-button.secondary:hover {
    background-color: rgba(26, 115, 232, 0.04);
}

.material-button.small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* Material 输入框 */
.material-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    margin-bottom: 1rem;
}

.material-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.material-input.small {
    padding: 0.5rem;
    font-size: 0.875rem;
    margin-bottom: 0;
}

/* Material 选择框 */
.material-select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    background-color: var(--surface);
    margin-bottom: 1rem;
}

/* 二维码生成器 */
.qr-generator {
    background-color: var(--surface);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.input-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.qr-result {
    text-align: center;
}

.qr-image {
    margin-bottom: 1rem;
}

.qr-image img {
    max-width: 200px;
    height: auto;
}

.qr-info {
    margin-top: 1rem;
}

/* 认证表单 */
.auth-form {
    max-width: 400px;
    margin: 0 auto;
    padding: 2rem;
    background-color: var(--surface);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.auth-form h2 {
    margin-bottom: 2rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1rem;
}

.auth-links {
    margin-top: 1rem;
    text-align: center;
}

.auth-links a {
    color: var(--primary-color);
    text-decoration: none;
}

/* 管理后台 */
.admin-container {
    padding: 2rem;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.admin-tabs {
    margin-bottom: 2rem;
    border-bottom: 1px solid #ddd;
}

.tab-button {
    background: none;
    border: none;
    padding: 1rem 2rem;
    font-size: 1rem;
    cursor: pointer;
    color: var(--on-background);
    opacity: 0.7;
    transition: all 0.3s ease;
}

.tab-button.active {
    color: var(--primary-color);
    opacity: 1;
    border-bottom: 2px solid var(--primary-color);
}

/* 表格样式 */
.table-container {
    overflow-x: auto;
}

.material-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--surface);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}

.material-table th,
.material-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.material-table th {
    background-color: #f5f5f5;
    font-weight: 500;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .input-group {
        flex-direction: column;
    }

    .admin-container {
        padding: 1rem;
    }

    .tab-button {
        padding: 0.75rem 1rem;
    }
}