/* 新UI样式 - 现代设计风格 */
:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --accent-color: #4895ef;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --success-color: #4cc9f0;
    --error-color: #f72585;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: url('bd.jpg') no-repeat center center fixed, linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    background-size: cover;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--dark-color);
}

.form-group {
    text-align: center;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-color);
    text-align: center;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 2rem;
    margin: 1rem;
}

.login-card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    padding: 2.5rem;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
}

.login-header {
    margin-bottom: 2rem;
}

.login-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.login-header p {
    color: #6c757d;
    font-size: 0.9rem;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    text-align: center;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-color);
}

.form-control {
    width: 90%;
    padding: 0.75rem 1rem;
    border: 1px solid #ced4da;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.25);
}

.btn {
    padding: 0.75rem 1rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

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

.btn-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

.login-footer {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: #6c757d;
}

.login-footer a {
    color: var(--primary-color);
    font-weight: 500;
    text-decoration: none;
    transition: color 0.3s ease;
}

.login-footer a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 576px) {
    .login-card {
        padding: 1.5rem;
    }
    
    .login-header h1 {
        font-size: 1.5rem;
    }
}