/**
 * 登录页面样式
 * 
 * @author Backend System
 * @date 2025-10-30
 */

body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.login-container {
    width: 100%;
    max-width: 450px;
    padding: 20px;
}

.login-box {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 40px;
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.login-header i {
    font-size: 60px;
    color: #667eea;
    margin-bottom: 15px;
}

.login-header h2 {
    color: #333;
    font-weight: 600;
    margin-bottom: 5px;
}

.login-header p {
    font-size: 14px;
    margin-bottom: 0;
}

.form-label {
    font-weight: 500;
    color: #555;
    margin-bottom: 8px;
}

.form-label i {
    margin-right: 5px;
    color: #667eea;
}

.form-control {
    border-radius: 8px;
    border: 1px solid #ddd;
    padding: 12px 15px;
    font-size: 15px;
    transition: all 0.3s;
}

.form-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.input-group .btn {
    border-radius: 0 8px 8px 0;
    border-left: none;
}

.input-group .form-control {
    border-radius: 8px 0 0 8px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 8px;
    padding: 12px;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

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

.form-check-input:checked {
    background-color: #667eea;
    border-color: #667eea;
}

.form-check-label {
    color: #666;
    font-size: 14px;
}

.login-footer {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid #eee;
    text-align: center;
}

.login-footer p {
    font-size: 13px;
}

.alert {
    border-radius: 8px;
    border: none;
    font-size: 14px;
}

.alert-danger {
    background-color: #fee;
    color: #c33;
}

.alert-success {
    background-color: #efe;
    color: #3c3;
}

/* 响应式设计 */
@media (max-width: 576px) {
    .login-box {
        padding: 30px 20px;
    }
    
    .login-header i {
        font-size: 50px;
    }
    
    .login-header h2 {
        font-size: 24px;
    }
}

/* 加载动画 */
.btn-primary.loading {
    position: relative;
    color: transparent;
}

.btn-primary.loading::after {
    content: "";
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid #fff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spinner 0.6s linear infinite;
}

@keyframes spinner {
    to {
        transform: rotate(360deg);
    }
}