/* 自定义登录页面样式 */
body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    height: 100vh;
    margin: 0;
    overflow: hidden;
    position: relative;
}

/* 背景动画效果 */
body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, rgba(255,255,255,0.1) 25%, transparent 25%, transparent 75%, rgba(255,255,255,0.1) 75%),
    linear-gradient(45deg, rgba(255,255,255,0.1) 25%, transparent 25%, transparent 75%, rgba(255,255,255,0.1) 75%);
    background-size: 60px 60px;
    background-position: 0 0, 30px 30px;
    animation: moveBackground 4s linear infinite;
    z-index: -1;
}

@keyframes moveBackground {
    0% { background-position: 0 0, 30px 30px; }
    100% { background-position: 60px 60px, 90px 90px; }
}

.login-box {
    margin: 0 auto;
    padding-top: 5%;
    animation: fadeIn 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.login-logo {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 30px;
    color: white;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.login-box-body {
    background: rgba(255, 255, 255, 0.95);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.login-box-body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
}

.login-box-body h3 {
    font-size: 28px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

.form-control {
    border-radius: 8px;
    padding: 12px 15px;
    border: 2px solid #e1e8ed;
    transition: all 0.3s ease;
    font-size: 16px;
    height: auto;
}

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

.form-control-feedback {
    top: 12px;
    right: 15px;
    color: #667eea;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 8px;
    padding: 12px;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover,
.btn-primary:active,
.btn-primary:focus {
    background: linear-gradient(135deg, #5a6fd8 0%, #6a4190 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

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

.help-block {
    text-align: center;
    font-size: 14px;
    margin-top: 10px;
}

#loginTips {
    color: #dc3545;
    font-weight: 500;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .login-box {
        padding: 20px;
        margin-top: 20px;
    }

    .login-box-body {
        padding: 30px 20px;
    }

    .login-logo {
        font-size: 28px;
        margin-bottom: 20px;
    }
}