body {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    min-height: 100vh;
    color: white;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.container {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    padding: 30px;
    margin-top: 40px;
    color: #333;
}

.search-input {
    min-height: 150px;
    font-size: 1.1rem;
    border-radius: 12px;
    resize: vertical;
    padding: 15px;
    border: 2px solid #e0e0e0;
}

/* 移除输入框获得焦点时的默认样式 */
.search-input:focus {
    outline: none !important;
    box-shadow: none !important;
    border-color: #e0e0e0 !important;
}

.search-title {
    font-weight: 700;
    margin-bottom: 25px;
    color: #2c3e50;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.engine-checkbox {
    margin-bottom: 10px;
    border-radius: 8px;
    padding: 8px 15px;
    transition: all 0.3s;
}

.engine-checkbox:hover {
    background: #e9ecef;
    transform: translateY(-2px);
}

.engine-label {
    font-weight: 500;
    color: #2c3e50;
}

.top-navbar {
    background-color: #ffffff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}
.top-navbar .nav-link {
    color: #333 !important;
    font-weight: 500;
    padding: 1rem 1.5rem !important;
    transition: all 0.3s;
}
.top-navbar .nav-link:hover {
    color: #6a11cb !important;
    background-color: #f8f9fa;
}