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

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container { 
    margin: 0 auto;
}

.header {
    text-align: center;
    color: #fff;
    margin-bottom: 30px;
}

.header h1 {
    font-size: 2rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.header p {
    color: #a0a0a0;
    font-size: 1.1rem;
}

.error-box {
    background: #fff0f0;
    border: 1px solid #ff6b6b;
    border-radius: 8px;
    padding: 15px 20px;
    margin-bottom: 20px;
}

.error-box ul {
    list-style: none;
}

.error-box li {
    color: #dc3545;
    padding: 5px 0;
}

.registration-form {
    background: #fff;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

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

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: #333;
}

.required {
    color: #dc3545;
}

.form-group input[type="text"],
.form-group input[type="tel"],
.form-group input[type="password"] {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #4a90d9;
}

.form-group input.error {
    border-color: #dc3545;
}

.radio-group {
    display: flex;
    gap: 30px;
}

.radio-label {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.radio-label input[type="radio"] {
    width: 20px;
    height: 20px;
    margin-right: 8px;
    cursor: pointer;
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.btn-submit {
    flex: 1;
    padding: 14px;
    background: linear-gradient(135deg, #4a90d9 0%, #357abd 100%);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(74,144,217,0.4);
}

.btn-submit:active {
    transform: translateY(0);
}

.btn-admin {
    padding: 14px 25px;
    background: #6c757d;
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: background 0.3s;
}

.btn-admin:hover {
    background: #5a6268;
}

.success-box {
    background: #fff;
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.success-icon {
    font-size: 5rem;
    margin-bottom: 20px;
}

.success-box h1 {
    color: #28a745;
    font-size: 2rem;
    margin-bottom: 15px;
}

.success-name {
    font-size: 1.2rem;
    color: #555;
    margin-bottom: 25px;
}

.reg-code {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
}

.reg-code label {
    display: block;
    color: #666;
    margin-bottom: 10px;
}

.reg-code .code {
    font-size: 1.8rem;
    font-weight: bold;
    color: #4a90d9;
    letter-spacing: 2px;
}

.tips {
    color: #888;
    margin-bottom: 30px;
}

.btn-back {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, #4a90d9 0%, #357abd 100%);
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
}

.login-container {
    max-width: 400px;
    margin: 100px auto;
}

.login-box {
    background: #fff;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.login-box h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
}

.login-error {
    background: #fff0f0;
    border: 1px solid #ff6b6b;
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 20px;
    color: #dc3545;
    text-align: center;
}

.btn-login {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #4a90d9 0%, #357abd 100%);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(74,144,217,0.4);
}

.admin-header {
    background: #fff;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    border-radius: 12px;
}

.admin-header h2 {
    color: #333;
}

.btn-logout {
    padding: 8px 20px;
    background: #dc3545;
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.9rem;
}

.btn-logout:hover {
    background: #c82333;
}

.admin-content {
    background: #fff;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.search-box {
    display: flex;
    gap: 10px;
}

.search-box input {
    padding: 10px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 0.95rem;
}

.search-box button {
    padding: 10px 20px;
    background: #4a90d9;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

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

.btn-export {
    padding: 10px 20px;
    background: #28a745;
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.95rem;
}

.btn-export:hover {
    background: #218838;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.data-table th,
.data-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.data-table th {
    background: #f8f9fa;
    font-weight: 600;
    color: #333;
}

.data-table tr:hover {
    background: #f5f5f5;
}

.data-table .actions a {
    padding: 5px 12px;
    background: #dc3545;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    font-size: 0.85rem;
}

.data-table .actions a:hover {
    background: #c82333;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 25px;
}

.pagination a,
.pagination span {
    padding: 8px 14px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    text-decoration: none;
    color: #333;
}

.pagination a:hover {
    background: #f0f0f0;
}

.pagination .current {
    background: #4a90d9;
    color: #fff;
    border-color: #4a90d9;
}

.no-data {
    text-align: center;
    padding: 40px;
    color: #888;
}

@media (max-width: 600px) {
    .form-actions {
        flex-direction: column;
    }

    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .search-box {
        flex-direction: column;
    }

    .export-buttons {
        flex-direction: column;
    }

    .data-table {
        font-size: 0.9rem;
    }

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