* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}
.login-container {
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}
.login-header {
    text-align: center;
    margin-bottom: 30px;
}
.login-header h1 {
    color: #667eea;
    font-size: 26px;
    margin-bottom: 6px;
    letter-spacing: 1px;
}
.login-header p {
    color: #888;
    font-size: 14px;
}
.login-brand-logo {
    display: block;
    width: 72px;
    height: 72px;
    margin: 0 auto 12px;
    border-radius: 16px;
    object-fit: cover;
}
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 500;
}
.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
    transition: border-color 0.3s;
}
.form-group input:focus {
    outline: none;
    border-color: #667eea;
}
.btn-login {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: transform 0.2s;
}
.btn-login:hover {
    transform: translateY(-2px);
}
.btn-login:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}
.error-message {
    background: #fee;
    color: #c33;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 20px;
    display: none;
}
.success-message {
    background: #efe;
    color: #3c3;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 20px;
    display: none;
}