body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0;
}

.login-card {
    background: #fff;
    border-radius: 16px;
    padding: 40px;
    width: 400px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-logo {
    font-size: 48px;
    margin-bottom: 12px;
}

.login-header h1 {
    font-size: 24px;
    font-weight: 600;
    color: #1a1a2e;
    margin: 0 0 8px 0;
}

.login-header p {
    color: #888;
    font-size: 14px;
    margin: 0;
}

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

.login-form label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: #555;
    margin-bottom: 8px;
}

.login-form input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 15px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    box-sizing: border-box;
}

.login-form input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.login-btn {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 10px;
}

.login-btn:hover {
    opacity: 0.95;
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.login-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.login-tips {
    margin-top: 20px;
    padding: 12px;
    background: #f5f7fa;
    border-radius: 8px;
    font-size: 12px;
    color: #888;
    text-align: center;
}

.login-tips strong {
    color: #667eea;
}

.error-msg {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #dc2626;
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 16px;
    display: none;
}

.error-msg.show {
    display: block;
}